Kenwood TS 480 HF Tranceiver

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kenwood ts-480 hf tranceiver

Preface
This in-depth manual for the TS-480 was written by the engineers
who actually
planned and designed the product. It is our hope that this
guide will serve to
convey the joys of HF and all the benefits of owning and
using the TS-480 to
whoever reads this guide – whether
you have already purchased a TS-480, an accomplished operator,
thinking of buying a
transceiver, or just thinking of taking up Amateur Radio
as a hobby. We believe the
TS-480 will appeal to everyone.
CONTENTS
Design Objectives…………………………………………………………..2
Development Objectives for the TS-480 Series………………………………..5
Circuitry ……………………………………………………………………7
TX circuits ……………………………………………………………….7
RX circuitry………………………………………………………………13
Auxiliary Features …………………………………………………………19
Features of the Built-in DSP………………………………………………..21
Tips……………………………………………………………………….28
Structural Features………………………………………………………..36
New Option: Voice Guide & Storage Unit (VGS-1)…………………………….42
New Option: ARCP-480 (Freeware)………………………………………….45
New Option: ARHP-10 (Freeware)…………………………………………..51
2
TS-480HX
TS-480SAT
200W output
(HF: 200W.50MHz: 100W)
100W output (HF: 100W.50MHz: 100W.
built-in automatic antenna tuner)

Design Objectives
Determination to create a unique transceiver
The concept of a compact HF transceiver first saw the light
of day with Kenwood’s TS-50. From
then on, such equipment has become an essential part of the
Amateur Radio world. Equipment
has now evolved with the appearance of multi-band models.
In developing this new HF transceiver, Kenwood has boldly
chosen not to follow this path, because
we wanted to develop a transceiver unlike any other available.
If we had developed a product
along the same lines as the others currently in the market,
the customers would not have found it a
very attractive buy and few would choose it. This is why
we wanted to develop a unique and
attractive Kenwood product, something that would effectively
serve to create a new market.
It was with these thoughts that we embarked on our new project
and began to mull over the details.
It was not to be an easy task. After all, every engineer
involved in development wants to create
something special and innovative. We had to find a way to
put it into practice.
Back to basics: “The appeal of HF lies in DX’ing.”
The search for “a completely new kind of transceiver” sounds
like it might turn out to be a wild
goose chase, and in truth it is in the nature of things that
such ideas rarely amount to much. But as
part of our brainstorming, we went back to basics. What first
emerged as a key concept was this:
“
The appeal of HF lies in DX’ing.” This is simple
to say, but maybe more difficult to realize. From
here the discussion moved ahead rapidly once it was decided
to develop a compact HF
transceiver.
According to conventional wisdom, a compact HF transceiver
is by definition a mobile transceiver,
and a fixed, base station is physically large. But we refused
to stick to these stereotypes as we
fleshed out the concept for a compact HF transceiver designed
to make DX’ing really enjoyable.
… Even if it were to be a mobile unit, as an HF transceiver
we wanted to ensure it would offer the
operating ease and basic performance needed to enjoy DX’ing.
… Consequently, it should also be able to serve as a fixed
station.
… The typical shack today has been equipped with a computer
and there is not a great deal of
room available for a large transceiver. This PC-transceiver
combination would become even
more common.
… Operating both as a mobile and as a fixed station, this
new model would target customers
dissatisfied with the compact transceivers currently on the
market.
This was the concept that we started with.
3

Standalone control panel
For mobile operations, a separate control panel is ideal,
but what if the transceiver is also to be
used as a base station? This was the problem we faced. With
a large desktop rig, it is no easy
matter to shift things around to find the best position,
so perhaps it would be a good idea to have a
separate control panel that could be moved easily. Also,
a desktop unit has various kinds of cables
connected to it. What with the heat the main unit produces
and the noise of the fan, etc., and
considering that it does not have to be on the desk in front
of you, it would surely be better to
separate the control panel and place the main unit elsewhere.
With the appearance of computers in today’s shacks,
it is certainly desirable to tidy up the desktop
as much as possible. We felt that we could contribute to
this evolutionary process. By opting for a
completely separate panel, we could ensure that it would
be large enough to offer sufficient
operating ease, since its dimensions would not be dictated
by those of the compact main unit. This
was how we arrived at the idea of a standalone control panel
that is slightly larger than the main
unit.
Focus on basic performance
The appeal of HF lies in DX’ing those places near and
far. For this reason, we put a priority on
operating ease and basic performance. At this point the project
team had already excluded any
idea of incorporating the V/UHF bands. Our approach was this: “Rather
than spending
development money on the V/UHF bands, let’s spend money
on HF performance.” “If someone
needs the V/UHF bands, then they can buy another product
that is tailored for these bands.” This
meant we had confidence that our product would offer more
than enough punch to perform well
even on grueling DX’peditions.
The 200W challenge
As explained, our initial starting point was a desire to
create a transceiver like no other. But we
would not have succeeded in meeting this objective with just
a standalone control panel and an
emphasis on basic performance. We needed something more if
we were to make the product truly
special and stand out from the crowd.
The answer was to be found in the realization that DX operations
depend on basic performance
and power. Real “power” in a transceiver is something
that many people look for. So a radical
proposal was made: “Rather than making the output 100
watts, let’s go all out for 200 watts!” But in
fact the only transceivers on the market with 200W output
were the expensive high-end models.
What we were developing was a compact transceiver.
We seemed to have run up against a wall: Did this mean that
in terms of size and cost we would
inevitably end up creating a high-end transceiver? After
long discussions, we made a
straightforward decision to challenge the status quo: If
conventional wisdom dictated that a 200W
output was only available from a high-end transceiver, then
we would change that dynamic.
At this point we could not see how this could be possible,
but we stuck to our conviction that a
200W transceiver did not have to be expensive. We were determined
to provide the customer with
a 200W transceiver at a reasonable price. As a result of
our single-mindedness, we were
eventually able to achieve our goal, creating a product of
about the same size as the TS-50 and, of
course, it had heavy-duty specs.
4

Adding appeal to fixed station operations
It is now increasingly common to see a PC sitting beside
the transceiver in the shack, but we
wanted to expand the interaction between computers and transceivers.
It was with this in mind that
Kenwood came up with the idea of an Internet remote-controlled
transceiver. You may be away on
a business trip, but you want to operate, or you may want
to use a large Yagi antenna out in the
suburbs from your downtown apartment. In these and many other
ways, fixed station operations
are becoming more varied and more difficult. However, laws
governing radio transmissions vary
from country to country. In Japan, we had just about resigned
ourselves to the fact that this could
only be implemented as an RX feature when fortunately the
law changed: starting January 13,
2004, both TX and RX operations became possible. This made
all our development work
worthwhile for our market in Japan and worldwide.
Overview of the TS-480 Series
The product concept for the TS-480 Series, as outlined, can
be summarized thus:
… Not simply a compact HF mobile transceiver like the TS-50
and other transceivers on the
market, the TS-480 is a completely new type of powerful compact
HF transceiver offering the
performance and features required for HF DX operations.
… TX output of 200W (HF), an astounding figure; and up
till now, only available from the
top-of-the-line models.
… Transceiver remote control
In order to realize all three of these, we started the design
process with the following planning
objectives:
1. Priority on basic performance that stresses the 1.8 ~
50 MHz range;
2. Dynamic range on a par with the TS-950;
3. Uncompromising RX performance, AF DSP as standard;
4. A control panel design that ensures top-notch operating
ease, so that desired functions
5
can be accessed instantly;
5. Support for a range of different operations as a mobile
station and as a full-fledged base
station, allowing the user to enjoy HF DX as much as with
a conventional fixed station;
6. A quantum leap in power output in a compact chassis, generating
200W even when
working off a DC 13.8V supply (in the USA there are no limitations
on the power output of
mobile transceivers, so it is being described as a “power
mobile”);
7. Internal automatic tuner for the 100W model to make it
more versatile and expand the
range of possible applications; and
8. Remote control via the Internet.
As for the name of the new series, which was intended to
reflect our planning objectives, we
decided on the 400’s in order to express continuity
with the popular TS-450 workhorse transceiver.
This was because the new product was not simply a compact
transceiver but would offer the sort
of performance and features Kenwood fans would expect of
a 400-series model. A workhorse
transceiver that could prove its worth in a variety of places – in
the shack, in a vehicle, in the field —
this was the TS-480 Series being planned by Kenwood.

Development Objectives for the TS-480 Series
The following is an explanation of our development objectives,
distinct from the planning
objectives.
If asked about the origins of the compact HF rig, people
outside Japan would no doubt think of the
Atlas Series. Following the Atlas, a variety of different
products appeared on the market, but it is
probably no exaggeration to say that Kenwood’s TS-50
was the first in the category of the 100W
(HF) compact all-mode transceiver. It is already more than
a decade since the TS-50 was
launched. Since then, successive models have grown increasingly
smaller while adding new
features and expanding band coverage to include V/UHF. Today,
this category has matured to the
point of actually forming a definable market. What we developed
in order to stir up and add fresh
stimulus to this market was the TS-480 Series.
•
Why a compact 200W transceiver?
•
Why a 100W model with a built-in antenna tuner?
•
Why HF~50MHz coverage?
The answers to these questions can be found in our planning
objectives. Let’s look at the technical
background.
The TS-480 concept began with development of the TS-570?
We first started looking in detail at the technical feasibility
not of the 200W model but of the model
with the internal antenna tuner. Today, there is nothing
special about a built-in AT, but for the
TS-570 we developed a relay-type AT. This replaced the previous
motor-driven variable capacitor
type of AT. Naturally this technology was used elsewhere
and by other manufacturers, but if
applied not to TX but to RX also, it is possible to use it
for receiver front-end passive tuning. For
transmission purposes, it is smaller than the conventional
type of AT of the time, especially with
regard to height, making it a good choice for building into
a compact set.
In 1996, when on a visit to the US to promote the TS-570
a local salesman asked whether we
were next going to put an AT into the TS-50. Well, perhaps
that was where the TS-480 got its start!
Achieving 200W output in a compact transceiver
In achieving our goal of 200W there was one major constraint – namely,
we could not raise the
voltage of the power supply. The TS-480 Series was to be
sold not only in Japan but internationally.
If we had been looking only at our domestic market, things
would have been different since the
output of mobile transceivers here is limited to 50W, but
conditions are different abroad, especially
in the US. In the US, since there are no limitations on the
output of either mobile or fixed stations,
mobile transceivers in the several hundred watt class are
not unusual. A common pattern for
operations is not to hook up a 100W unit to a linear amp
and mount a 200W fixed transceiver in a
car. Moreover, the most common type of vehicle is a pickup
with a 12V battery, so people expect to
obtain a 200W output with a regular 13.8V power supply.
If one thinks of the way people operate such transceivers
here in Japan, a question arises: Why
add that much power if it cannot be used as a mobile rig?
The TS-480 has been designed with a
priority on operating ease. One reason for this is that we
saw the TS-480 being used as a fixed
station in Japan, where 200W mobile operations are not permitted.
Most 200W HF transceivers
are high-end and their price reflects this. But in the workhorse
class, most models offer only 100W
output. So we can say that our new product can fulfill the
wishes of those who have received an
advanced permit and thus want a 200W rig – as long
as it is not expensive.
6

Focusing on HF
Raising power output and adding an antenna tuner are both
moves in the right direction, but
limiting the transceiver to the HF bands when the mainstream
nowadays is HF~V/UHF would
seem to be going against the tide of the times. Yet opting
for the multi-band route inevitably leads
to larger dimensions and higher prices. In this genre, price
is an important factor, so by limiting the
TS-480 to HF, we developed what is in fact a compact transceiver
that stands apart from the
competition. The TS-480 is designed to ensure not only excellent
TX performance but also
superior RX performance.
7

8
Circuitry
.. TX circuits
200W final section
Explained here is the circuitry for the 200W final section,
the crown jewel of the TS-480 Series.
This circuit is responsible for developing 200W output with
a DC 13.8V power supply. Of course,
various approaches are possible. The typical one would be
to use a high voltage (28V or more)
with the FETs in a push-pull arrangement. However, we did
not adopt this approach since a
DC-DC combination that raises the voltage to 28V exclusively
for this purpose was considered
inappropriate for a compact rig. The final section of a regular
transceiver delivers 100W from 13.8V,
so the normal approach would be to use this as the basis
for a 200W design. Hence, we
considered the pros and cons of using 4 final devices, each
with 50W output, to produce a total of
200W.
I will not go into details here, but following our calculations
and tests we discovered that simply
hooking up the devices in parallel would not be a practical
solution because of issues related to the
output transformer. The solution we finally adopted was to
have a pair of 100W final sections with a
standard push-pull arrangement, combining these to obtain
an output of 200W. Since this is the
most popular method, we should perhaps have adopted it from
the start, but having no past
experience with a transceiver producing 200W from a 13.8V
supply, we looked at the design
issues from various angles including performance, quality,
size, cost, and manufacturability.
When one simply says “combine”, there are in
fact different ways to do this. For example, you can
take a pair of 100W final circuits and connect in series
the secondary circuit of the output
transformer in phase to double the output, thus producing
200W. When we actually experimented
with this, we found that it worked okay. Frequency characteristics
were good. However, using this
method means that one cannot provide isolation between the
amplifiers. So what we finally
adopted was the old standby in situations like this – namely,
a wideband hybrid combiner.
The circuit for this combiner is straightforward: if you
reverse the input and output it will actually
work as a splitter. For the TS-480HX, we put together a 200W
output final circuit by using this type
of combiner on the input/output of a pair of 100W final amplifiers.
For the 50MHz band, we have
limited the output to 100W because of the heat that we knew
would be generated from loss.
A hybrid combiner only works on the condition that the two
signals are identical in amplitude and
phase. Since our final section was to operate in the HF~50MHz
bands, it would qualify as
wideband in terms of frequency but there would be some concern
for the balance frequency
characteristics. However, this sort of power combiner has
been used before for general
applications, so in that sense it is an approach that can
be adopted with some confidence.
When it came to the actual design (mounting), an ideal, symmetrical
layout of the components was
not possible; however, care was taken to preserve the balance,
for example by employing
isometric wiring for patterns in which there are many high-frequency
currents flowing.
The device used was the 2SC2782 bipolar transistor. Since
this has a collector loss of 220W, there
would a total loss of 880W in a 200W set equipped with four
of them; this represents more than
enough leeway for operations.
Continuous transmission performance with such a compact design
is explained in the section on
the TS-480 structure.

Fig. 1 illustrates TX IM characteristics with 200W output
at 14MHz, while the second graph (Fig. 2)
charts high-frequency spurious emissions.
Fig. 1: TX IMD (output 200W)
9
Fig. 2: TX Spurious emissions

SPS (separate power sources) [TS-480HX only]
SPS is shorthand for “operating at 200W using two 100W
13.8V power sources.” To generate a
200W output from 13.8V requires a maximum (total) current
of 41A. As previously explained, the
TS-480HX employs a pair of 100W final amps. What the SPS
design does is to supply these
amps from two separate power supplies, as shown in Fig. 3
below.
The use of two power supplies may appear inconvenient, but
in actual fact this arrangement is
quite practical. Many customers already possess a 100W class
power supply, so when they
acquire this 200W transceiver they do not have to make an
additional purchase of a new 200W
class power supply. It is possible for them to make use of
the 100W unit in their possession.
The PS-53 power supply is specified for the TS-480; however,
as long as it can produce 20.5A or
more continuously at 13.8V, other power supplies can be used.
Also, it is possible to operate this
transceiver using a single power supply that can produce
at least 41A continuously; note, however,
that two power cables would still be needed.
Fig. 3: SPS schematic diagram
10
Other circuits
DC power
supply 1
(13.8V, =20.5A)
DC power
supply 2
(13.8V, =20.5A)
Final amp 1
Final amp 2
Drive amp
DC1 connector
DC2 connector Chassis

Failsafe device (some TS-480HX versions only)
The use of two power supplies and two final amps in parallel
is something that has not been tried
before, and naturally there may be some anxiety on the part
of the user regarding what would
happen if just one of the power supplies suddenly failed.
Such a situation would be handled safely,
since the TS-480 series is equipped with several failsafe
devices.
… Should a difference of 1V or more be detected between
the two power supplies: “RX ONLY”
appears in the display and transmission operations are inhibited.
… Should the voltage of one power supply drop to zero:
if the failed supply is DC1 (Fig. 3), the
transceiver is powered down; if DC2 fails, “RX ONLY” appears
in the display and only RX
operations are possible.
… Should a final amp malfunction: if, for example, the
output of one of the final amps fell, resulting
in an imbalance, “PA-ERROR” appears in the display
and transmission operations are
terminated.
In addition, there is the usual complement of failsafe devices,
including output control triggered by
high temperature, high voltage detection, and SWR output
control. These failsafe devices will
provide temporary protection for the internal circuitry;
however, should such a situation arise you
should not continue using the transceiver, but rather deal
with the problem in accordance with the
troubleshooting guidelines.
100W final section
Like the 200W final section, the 100W final section uses
2SC2782 transistors. The drive and
peripheral circuits are virtually identical to those in the
200W model, enabling 100W output for the
HF~50MHz bands.
For the Japanese market, there are 50W and 10W (50MHz: 20W)
models, allowing buyers to
choose whichever best suits them – that is, their license
and their intended use (mobile or fixed).
It should be pointed out that it is possible to increase
the output of these models: the 50W model to
100W, and the 10W model to 50W or 100W. A TS-480 owner who
acquires a more advanced
license and wants to make use of this capability should go
to the nearest service center. Note that
it is not possible to upgrade to 200W output.
Also, 50W mobile transceiver warranty certification is available
for both 200W and 100W models
used as fixed stations.
Ever since the TS-570, Kenwood has adopted a method of converting
transceivers to higher
output specifications that does not require a kit. Conversion
cannot be performed by the individual
user, but because this method does not depend on finding
stock of the appropriate kit it is proving
popular.
Antenna tuner (TS-480SAT)
The 100W model is equipped with the relay-driven antenna
tuner that was developed for the
TS-570. Since there is no variable capacitor, gears or other
rotating parts, this antenna tuner is
very responsive and trouble-free. Thanks also to the several
preset memories supplied for each
band, you can instantly call up settings when moving up or
down a band.
You can see the 200W and 100W final sections in Figs. 4 and
5, respectively.
11

12
Fig. 4: 200W final section
Fig. 5: 100W final section with antenna tuner

FM circuit
There were two approaches used for the FM circuit of the
conventional all-mode transceiver. Either
there was a dedicated modulation circuit using a 10.695MHz
crystal, or the modulation was
performed by the VCO on the 2nd OSC. The latter was not an
option for the TS-480, and since the
whole transceiver had to be compact, we did not adopt the
former approach. How then is FM
handled by the TS-480?
What we have employed for the TS-480 is something that is
rarely seen these days in ham radios:
the reactance modulation approach, which does not have the
modulation applied directly to the
oscillating circuit. This type of circuit was widely used
in the days when a crystal was used to
change channels in FM car transceivers, but it dropped from
sight when PLL became the norm. It
is not a new circuit, but it has excellent characteristics.
In the TS-480, this reactance modulation
circuit is connected to the output of the DDS, which serves
as the source for the PLL reference
frequency, so effectively it is modulating the 1st OSC.
This approach offers several advantages:
… Since frequency modulation is not conducted in the TX
signal circuitry, even if the TX RF signal
is passed through a roofing filter, it will not suffer from
any delay distortion caused by the filter;
… Since there is no need for an oscillator to perform modulation, “one-shot“ frequency
management is permitted when transmitting on FM with the
same precision as SSB;
… This approach saves on space and cost.
Fig. 6: FM modulation block diagram
13

.. RX circuitry
Front end
As explained in the section on development objectives, what
distinguishes the TS-480 Series are
incomparable features and performance that result from our
focus on HF. Of special note are the
dynamic range characteristics in the HF bands, demonstrating
the fact that, despite the compact
dimensions of this transceiver, there has been no design
compromise.
One of the circuits that is important in determining dynamic
range is the first mixer. Now there are
some compact transceivers covering HF~V/UHF that are designed
to cover all frequency bands
with a single mixer. Since HF~50MHz is the “home turf” for
the TS-480 Series, it has an advantage
as in regards to the operating conditions for the mixer.
Since developing the TS-950, Kenwood has
exclusively employed J-FET quad mixers, and the TS-480 is
no exception. Fig.7 illustrates the
mixer circuit.
Fig. 7: RX 1st mixer
14

How well does it actually perform? Fig. 8 is a graph illustrating
the dynamic range characteristics
when changing the separation of two interfering signals.
For the sake of reference, results for the
TS-480 are plotted against those obtained using other compact
mobile transceivers (on the
market) under the same conditions.
Fig. 8: RX dynamic range
Looking at Fig. 8, results higher up the graph indicate wider
dynamic range.
When the RX frequency is 14.100MHz, and for example there
is simultaneous interference from
two signals at 14.150MHz and 14.200MHz, with the nonlinearity
of the RX section, spurious
signals are generated at 14.100MHz and 14.250MHZ, enabling
reception. Since the frequency
separation at this point is 14.200MHz -14.150MHz = 50kHz,
the +50.0KHz point on the horizontal
axis of Fig. 8 corresponds to these conditions. Under these
conditions, if there were interfering
signals that were faintly picked up by the other transceivers
in this comparison, the strength of
those interfering signals would have to rise by 10~15dB for
the TS-480 to begin suffering the same
effects.
When there is interference in close proximity to the RX frequency,
there is no difference between
these models, with one notable exception. In this area we
are approaching the bandwidth of the
roofing filter, so to put it another way, the fact that we
can observe a difference between the
transceivers at the +50kHz point – where the interference
is sufficiently eliminated by the roofing
15

filter – reflects a difference in the manufacturers’ approach
to design from the antenna to the 1st
mixer.
It is not just the mixer that determines the characteristics
of the front end: all of the components
between the antenna terminal and the mixer can have an impact.
Despite the compact design of the TS-480 Series, its RX BPF
divides up the 500kHz~60MHz
range into 10 bandwidths. Since several coils are employed
in this BPF circuit, small coils have to
be used in a compact transceiver. When discussing front end
linearity, attention focuses on
semiconductors such as the PIN diode for switching bands,
but in fact the coils used in this BPF
can be “nonlinear” parts, depending on operating
conditions. Differences in their characteristics
become more noticeable the smaller they are. In the early
stages of developing the TS-480, we
looked at the mutual modulation characteristics of a number
of coils, picking only those that
demonstrated the best performance.
With this compact transceiver it was not possible to use
a passive tuner equivalent to what is found
in top-end models, but our emphasis on HF performance was
such that we selected components
whose advantage cannot even be appreciated from a circuit
diagram.
Fig. 9 is a graph demonstrating RX sensitivity. Needless
to say, for HF, especially in the low bands,
there is more importance attached to multi-signal characteristics
than to sensitivity, but obtaining a
sufficient level of sensitivity can be vital during mobile
operations when one cannot expect much in
the way of antenna gain.
As with previous models, sensitivity is set to switch at
21.5MHz with the pre-amp on. However,
there is a difference: previously the pre-amp itself was
switched, but in the case of the TS-480 this
is managed by switching the pre-amp’s NFB gain.
Fig. 9: RX sensitivity
16

Jumpers for joy
As with the TS-2000, something special has been provided
for both the BPF ATT in the BC band
and the regular ATT:
… The BPF has been equipped with an ATT in order to cope
with powerful local broadcasting
stations in the BC band. However, a jumper can be used to
switch from NORM to DX, bypassing
this ATT and raising sensitivity by about 20dB.
… The ATT accessible from the control panel defaults to
12dB, but by removing the CN4 jumper it
is possible to increase this to about 20dB.
Fig. 10: Jumper locations
RF unit (X44-3270-00) component surface (J72-0874-19)
17
ATT at BC band

Circuitry after the roofing filter
Except for FM, the TS-480 has a double super: 1st IF is 73.095MHz
and the 2nd IF is 10.695MHz.
For FM, there is also a triple super as low as 455kHz. This
is followed by analog detection and
signal processing performed by the AF DSP in a standard arrangement.
The AF DSP is not
optional: it is equipped as standard. DSP features and characteristics
are explained in the DSP
section.
Three newly developed optional filters are available for
the 2nd IF. Previously, there was only one
10.695MHz optional filter: the YK-107C (500Hz). This filter
was developed at the same time as the
TS-790, and since the focus was on its use for V/UHF, there
may have been times when users felt
it was lacking when it came to HF operations. So when we
were developing the TS-480, we
redesigned the 500Hz filter, greatly improving its shape
factor. We also used the opportunity to
design new 270Hz and 1.8kHz (SSB narrow) filters.
Fig. 11 graphically illustrates the difference between these
filters in the 500Hz band.
Fig. 11: Comparison of optional CW filters (500Hz)
18

Whereas the TS-570 provided only a single slot for installing
an optional filter, the TS-480 has two
slots, meaning that two of the three filters can be installed
at the same time. And the process of
installation itself is quite easy: there is no need to remove
the main unit, since the option installation
unit has been designed to be separately removable.
The photograph in Fig. 12 shows the option installation unit.
This can be used to install not only
these IF filters but also a high-stability TCXO SO-3 (±0.5ppm,
-10~+50°C), which is optionally
available.
Fig. 12: Option installation unit
If you unclip the white connectors on either side and remove
the screws
that hold the board in place, you can independently remove
the unit for
installing the optional filters.
Since the type of filter is recognized automatically, it
does not matter in
which order you install filters in the slots.
19

Auxiliary Features
In addition to the basic TX/RX circuitry already described,
the TS-480 is equipped with a number of
auxiliary features of considerable practical benefit. What
follows is an introduction to some of
these.
.. Full compatibility with digital modes (data modes)
PSK31 and RTTY operations can now be performed with ease
using PC software. The TS-480
has been designed to make it easy to use such digital modes.
… External audio input/output terminals, separate from
the mic and speaker terminals, are provided.
For each of these the level can be adjusted in ten steps.
… You can select special AF DSP filters for use with digital
modes. Specially provided for PSK31
use is the choice of either a 1000Hz or 1500Hz beat frequency.
… With the optional CW filters installed, you can choose
between them even during SSB reception,
which we have had many requests for.
… It is possible to switch the VOX function so that it
will respond either to mic input or to an external
audio signal. No special standby wiring is needed for making
digital use of this VOX function.
… When transmitting voice with PTT, external input signals
are muted. Conversely, when
transmitting using an external input, the mic input is muted;
thanks to this feature, there is no
need to disconnect the mic during digital mode operations.
(Note that if you put an external input
on standby using the mic PTT, it will not be modulated; sometimes
users have queried as a
possible fault, but it is not.)
.. Features useful for 50MHz operations
… You discover a DX CW signal during a USB band search!
The TS-480 has a feature that is
perfect for such times: you can automatically switch to CW
transmission by just keying the
transmitter (key down) with your CW key, keyer or CW computer
program.
… When scanning 50.110~50.150 with the SSB program scan,
if you want to watch carefully at
10kHz intervals just use a slower scan speed. This is also
possible with memory scan, but in that
case you cannot hear frequencies in between. This allows
you to set the scan speed slower by
up to 5 points for selected frequencies.
… The noise blanker, which has a reputation for being very
effective in combating even weak noise,
is now even better: we have added the ability to adjust the
threshold level.
.. Features useful for mobile operations
… The TS-480 is equipped with a newly developed DNL (digital
noise limiter). Although the principle
and operation of this DNL is quite different, the effect
is somewhat like the old ANL (audio noise
limiter). Pulse noise is handled by a standard noise blanker,
but if you find this is not working very
well as a result of a strong signal overlap or because of
different types of noise, you should give
the DNL a try. In some cases, by processing audio signals
with the DSP one can effectively
eliminate pulse noise. For details, see the DSP section.
20

… TX tuning is a handy feature to have. It outputs a low-power
continuous carrier for adjusting a
screw-drive or similar antenna. It allows you to transmit
a continuous carrier that is independent
of the mode and power of your current operations. Simply
assign a PF key to this function.
… No paddle, but you want to give CW a try? No problem.
With mic paddle mode, you can use the
up/down keys on your microphone as a simple paddle.
.. New 5MHz band
US versions are compatible with the new 5MHz band; this also
goes for the antenna tuner.
21

Features of the Built-in DSP
22
.. DSP circuit
The digital signal processor equipped on the TS-480 is the
16-bit
fixed-point TMS320VC5402 from Texas Instruments, which
offers excellent value for the money. Running at 100MHz,
it
provides double-precision arithmetic operations (equivalent
to
32-bit processing), making it more than capable of serving
as an
AF DSP. Thanks to this, the TS-480 offers many powerful
features of use in HF operations.
.. Ideal for mobile operations: DNL
When you hear the crackling of ignition and other types of
pulse noise, it is possible to remove it
using the noise blanker (NB); however, this does not work
in all cases. Depending on the type of
noise, or if there is a very strong signal close by, the
pulse noise may remain and be demodulated.
This can result in an unpleasant sound being emitted from
the speaker, thus reducing the clarity of
your target signal. In such cases, the DNL (digital noise
limiter) can reduce pulse noise that has
been demodulated at the AF stage, effectively extracting
your target audio signal.
Fig.13 is a block diagram illustrating in principle how the
DNL operates.
Fig. 13: Principle of DNL operation
NEW
BPF Delay device
LPF
Calculation of
amplitude
variation
Delay device
Removal
of DC
component
Derivation of
attenuation
coefficient

First, the input signal is divided into its low- and high-frequency
components. Ignition and other
pulse noise tends to be concentrated in the latter, from
which amplitude variation is output. The
attenuation coefficient derived from this signal is multiplied
by the input signal. As soon as pulse
noise occurs, the attenuation coefficient rises instantaneously,
thus damping the amplitude
variation in the input signal. Because of this adaptive processing
performed by the DNL and based
on the amplitude variation, the output signal has virtually
none of the “digital feel” that is often the
mark of digital signal processing. It is perhaps only natural
to associate this DNL with the old “noise
limiter” technology, but as explained it works on a
completely different principle, performing the sort
of advanced processing that is only possible with DSP.
Because the TS-480 will be often used for mobile operations,
DNL parameters have been tuned
so as to have maximum effect on ignition noise. However,
even when used as a fixed station, it
can be very effective on irregular, unanticipated noise,
so we recommend that you try making use
of it, in combination with the noise blanker as well.
Fig.14 demonstrates how ignition noise is reduced by the
DNL.
Fig. 14: The effect of DNL on ignition noise
The DNL works in SSB, CW, FSK and AM modes, and it can be
used in conjunction with other
interference reduction and noise elimination features.
.. Noise reduction
There are two methods available for noise reduction: NR1
and NR2. NR1 is a line enhancer that
employs adaptive filter technology. By shaping a filter that
lets through signals with a certain
amount of periodicity, as with voice and CW, it can suppress
noise that falls outside the passband.
NR2 employs what is known as SPAC (speech processing by auto
correlation) technology. What
results from looping one cycle of the RX signal’s autocorrelation
coefficient is then output as the
received audio. What this means is that only periodic signals
found in the received audio emerge.
In principle this approach can result in a small amount of
noise at the “seam” where the periodic
signal is looped together, but in practice it proves extremely
effective at noise compression.
NR1 is a good choice for SSB and other audio signals, while
NR2 is especially effective when
used with single frequencies, as with a CW signal.
Figs. 15~17 demonstrate the effect of applying NR1 and NR2.
For comparison purposes, the
same weak sine signal was received, with the audio output
monitored by an FFT analyzer.
23

24
Fig. 15: NR OFF
Fig. 16: NR1 ON
Fig. 17: NR2 ON

.. Beat cancel
Beat cancel (BC), as its name implies, is designed to cancel
unpleasant beat interference. Like
NR1, it uses adaptive filter technology, tracking a beat
and canceling it by shaping. It is very similar
to a band elimination filter. Even if there are multiple
beats, BC can track and cancel them all.
However, since BC operates at the AF stage, should powerful
beat interference be experienced
during DX operations, even though beat cancel works properly,
by then the AGC has already
attenuated both the interference and the target signal. To
combat this sort of beat, IF shift is used
to eliminate the interference.
Figs. 18 and 19 show how BC cancels beat signals, as monitored
by an FFT analyzer. You can
see how the three beats present in the signal are removed
with almost surgical precision.
Fig. 18: BC OFF
25
Fig. 19: BC ON
There are two methods available for beat cancellation: BC1
and BC2. These have been tuned so
that BC1 is effective against weak or continuous beat interference,
while BC2 cancels intermittent
beat such as a CW Morse signal. (Note that since BC is designed
to remove the beat, and does
not function in CW mode.)

.. RX DSP filters
In SSB, AM and FM modes, you can independently set high-
and low-cut frequencies for the AF
filters to suit operating conditions (slope tune).
Fig. 20 illustrates how slope tune works. When there are
interfering signals in proximity to the
target signal, you can use a high-cut filter and a low-cut
filter to remove the signals above and
below the target.
In SSB mode, installing the optional SSB narrow filter results
in even better interference reduction.
In AM mode if you select NAR, RX is possible using this SSB
IF filter.
Target signal
Interference Interference
Target signal
Low-cut Hi-cut
Interference Interference
26
Fig. 20: Slope tune in action
Listed below are the cutoff frequencies (unit: Hz) that can
be chosen; default values are shown in
bold.
SSB/FM
Low-cut 0 50 100 200 300 400 500 600 700 800 900 1000
Hi-cut 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800
3000 3400 4000 5000
AM
Low-cut 0 100 200 500
Hi-cut 2500 3000 4000 5000
In CW and FSK modes, the AF filters function as a VBT, changing
bandwidth without altering the
center frequency. In CW mode, the center frequency is coupled
to the CW pitch, whereas in FSK
mode it is determined by the FSK tone and FSK shift frequencies.
Fig. 21 shows how it is possible during CW operations to
extract a target signal from surrounding
interference by changing the AF filter bandwidth (WIDTH).

Target signal
Interference Interference
Target signal
Interference Interference
Fig. 21: Switching WIDTH
during CW operations
Listed below are the filter bandwidths (unit: Hz) that can
be chosen; default values are shown in
bold.
CW
WIDTH 50 80 100 200 300 400 500 600 1000 2000
FSK
WIDTH 250 500 1000 1500
When the optional CW filters are installed, the TS-480 will
automatically select the optimum IF filter
in accordance with the DSP filter bandwidth.
Also available are filters for PSK31 and RTTY data mode operations.
From the menu, if you select
ON for the “Available data communications filters”,
these data communications filters can be used
in SSB mode. You can choose from 3 center frequencies and
7 WIDTH settings.
Listed below are the filter types (unit: Hz) that can be
chosen; default values are shown in bold.
27
For data
communications
Center 1000 1500 2210
WIDTH 50 100 250 500 1000 1500 2400
During PSK31 operations, the center frequency is set to either
1000Hz or 1500Hz.
Furthermore, since it is now possible to select an optional
CW IF filter in SSB mode, it is possible
to narrow the bandwidth.

.. RX equalizer & TX equalizer
If you use the RX equalizer it is easy to adjust RX audio
quality. Take your pick from flat (default),
high boost, Formant pass, bass boost, and conventional settings.
As a new feature, the TS-480
actually offers two types of high boost and two types of
bass boost.
TX audio quality can similarly be adjusted with the TX equalizer.
It is easy to make any changes to
suit your taste: for example, mic characteristics can be
corrected, and you can apply
compensation to match the characteristics of your own voice.
For TX there are now two types of
high boost and two types of bass boost, so why not give them
a try?
Fig. 22: TX equalizer characteristics (example)
If you use the Audio Editor function (ARCP-480), available
free for downloading, the options for
equalizing expand even more. In addition to a total of 35
types of equalizing samples, it offers tools
for freely adjusting such parameters as filter type, cutoff
frequency and amount of attenuation. The
settings made with the ARCP-480 software can be applied by
selecting U (user) from any of the
TS-480’s equalizer menus.
While it is true that neither the built-in equalizers nor
the audio editor software provide the same
degree of freedom as the graphic equalizers found in audio
entertainment equipment, they are
useful as a means for tailoring audio quality to suit.
.. CW auto tune
A useful feature for tuning in to another station is CW auto
tune. There is more than one method
for zeroing in on a target frequency – such as matching
RX beat with sidetone pitch, or getting the
pitch frequencies that can be heard when CW reverse is ON
and OFF to be the same – but it is
very easy if you engage CW auto tune when you can hear the
other station. It just takes the press
of a button to make the VFO automatically zero in on the
target. Note, however, that there are
various limitations associated with this feature – for
example, the tuning range is 300Hz on either
side of the pitch frequency, and it can be confused by interference – so
you should learn how to
make good use of it.
28
The graph in Fig. 22 plots overall
frequency characteristics from mic
input to antenna output, illustrating
the effect of some of these
equalizer settings.

Tips
As with other Kenwood HF transceivers, the TS-480 provides
menu access to its many features.
By selecting and adjusting these features, you can customize
the TS-480 so that it fits perfectly
into your way of operating a radio. Introduced here are tips
on how to get the most out of the
various items listed in the menus.
29
.. TS-480 menus
Group # Function Use
00 Brightness of display
backlighting
(5 levels, including OFF)
You can adjust brightness to suit the
ambient lighting level. Turning
backlighting off reduces power
consumption by about 30mA.
Operator
interface
01 Key illumination ON/OFF Turning illumination off reduces
power
consumption by about 30mA.
02 Auto mode Mode can be changed automatically
depending on frequency. This is more
convenient than setting VFO A to CW
and VFO B to USB.
03 Tuning control adjustment
rate
By reducing the adjustment rate, you
can make it easier to tune.
04 Frequency step for the main
encoder in FM mode
You can change frequency with the
main encoder in the same way that
you can change channels.
05 Frequency rounding for the
MULTI control
With this switched OFF, if you
accidentally change frequency with the
MULTI control, you can return to the
original frequency.
Tuning
06 Frequency step size for BC
band
When ON, frequency step size is
9kHz. When OFF, step size is
determined by the STEP value. The
factory setting for US models is OFF;
for other markets ON is the default.
Memory
channels
07 Temporarily change memory
frequency
Switch ON to operate a frequency in
memory without transferring it to a
VFO.
08 Program slow scan Useful for 50MHz scanning.
09 Program slow scan setting You can choose how much to slow
the
scan.
10 Program scan hold You can pause the scan for 5 seconds,
a handy way to avoid missing a signal.
Scan
functions
11 Scan resume method You can switch between time-operated
and carrier-operated scan resume to
suit your purpose.

12 Beep output level You can adjust this to suit your
30
preference.
13 Sidetone volume For full break-in, it is easier to hear
the
sidetone if you raise this volume.
14 VGS-1 message playback
volume
You can check what has been
recorded.
15 VGS-1 announcement
volume
Switch this OFF if you do not need
announcements while working the
radio.
Volume
adjustment
16 VGS-1 announcement
speed
You can adjust this to suit your
preference.
RX IF filters 17 Use CW IF filter for SSB
reception
This is useful for PSK31 operations.
18 DSP RX equalizer You can adjust frequency
characteristics during reception. Select
the position that best suits your
external speaker/headphones.
DSP
equalizers
19 DSP TX equalizer As with #18, this is not as versatile
as a
dedicated graphic equalizer, but it is
useful for tailoring TX frequency
characteristics to match your mic and
voice.
DSP TX
filters
20 DSP TX filter bandwidth As this is AF DSP, it is not as
versatile
as IF DSP, but it can be used to
remove low frequencies during
transmit.
Fine-tuning
TX output
21 TX power output control You can choose between a 5W step
and a 1W step. Useful for fine
adjustment of output when using a
linear amp.
TX control 22 Time-out timer This automatically terminates
transmission after a set time. Useful as
a failsafe for network (KNS)
operations.
23 Frequency when using
transverter
You can change the frequency
displayed by the transceiver to the
operating frequency of the Transverter.
Unlike the TS-570, you can set any
frequency.
Transverter
24 Output power adjustment for
transverter
Transverter output is fixed at 5W for
the TS-570, but with the TS-480 you
can choose output freely (within the
transmitter’s capability).

31
25 TX hold when internal AT
completes tuning
After completion of tuning, there is still
approximately 10W of output, so this is
useful if you want to go on to tune the
linear amp.
26 In-line AT while receiving The internal antenna tuner
can also be
used during RX. Depending on
conditions, sensitivity can vary by
enough to see a change in the
S-meter. It can also reduce
low-frequency interference.
Antenna
tuner
27 External AT control method If you own an AT-300, you can
connect
it to the TS-480; however, operation is
limited by the capabilities of the
AT-300.
28 Linear amp control for HF
band
Linear amp
29 Linear amp control for
50MHz band
You can control the linear amp
independently for the HF and 50MHz
bands. And if the amp is not
compatible with full break-in, you can
add in a delay for the TX attack.
30 VGS-1 constant recording With the VGS-1 Voice Guide and
storage unit installed, you can engage
constant record for the RX signal.
Maximum playback time is 30
seconds.
31 Repeat playback of
voice/CW messages
This is not just for contest CQ
machines; it can be used as a simple
beacon.
Message
playback
32 Interval time for #31 Interval time can be adjusted up
to a
maximum of 60 seconds.

33 Keying priority over playback Without switching off the
repeat
32
playback for messages, you can start
keying.
34 CW RX pitch / TX sidetone
frequency
Select RX pitch frequency between
400Hz and 1000Hz. At the same time,
sidetone frequency changes with the
pitch frequency. This can be used to
zero in on a target signal by matching
the sidetone frequency with the RX
beat.
35 CW keying weight ratio Change the dot/dash weight ratio.
This
is usually set to AUTO.
36 Reverse CW keying auto
weight ratio
You can change the AUTO setting for
#35.
37 Bug key function Manual TX can be enabled for dashes
only.
38 Swap dot & dash paddle
position
Swap the paddle position to suit either
right-handed or left-handed use.
39 Auto CW TX in SSB mode Automatically switch mode to CW
transmission by simply operating the
paddle.
CW
40 Define CW tune frequency Useful if used in combination
with #39,
as there is no need to operate the dial
to zero in on a target.
41 FSK shift
42 FSK keying polarity
FSK
43 FSK tone frequency
Standard FSK operating parameters
are covered by these menus.
FM
44 Mic gain for FM You can adjust FM mic gain (3 levels)
45 Filter bandwidth for data
communications
This enables you to pick the
appropriate DSP filter for data
communications using the filter switch
on the control panel.
46 AF input level for data
connector
Data
communicat
ions
47 AF output level for data
connector
Adjust input and output levels
independently when the TS-480 is
connected to a SoundBlaster™ card or
other external device.

33
48 Assign PF keys on the
control panel
You can assign functions to the PF
keys on the control panel as detailed in
the separate table.
49 Mic PF1 key
50 Mic PF2 key
51 Mic PF3 key
PF keys
52 Mic PF4 key
You can assign functions to the PF
keys on a multifunction mic as detailed
in the separate table.
53 Split frequency transfer Split
frequency
transfer
54 Permit to write #54 to target
VFOs
Transfer modes/frequencies between
compatible transceivers. Useful when
one is being used as a slave receiver.
TX inhibit 55 TX inhibit Inhibits TX, which is useful if
the
transceiver is to be used for RX only as
it prevents unintentional transmissions.
PC data rate 56 COM port communication
speed
Select 4800~115200bps.
External
devices
57 DTS polarity In data communications this switches
the logic for transmission. You should
match polarity to the external device
you are using.
TX inhibit 58 Busy lockout You can select BSY lockout to
inhibit
transmission when busy.
APO 59 APO (auto power off)
function
Power can be switched off
automatically in the absence of any
operations.
VOX source 60 Select input for VOX Select either the mic
or the data input
for VOX activation. Standby wiring may
not be required provided that the
method used is compatible with data
communications. (Be careful to ensure
correct TX delay.)

34
.. Functions that can be assigned to PF keys
# Assigned
function
Use
0~60 MENU #00~60 The selected menu item can be called up
directly, making this
useful for menu functions that you often use.
61 Voice1 In addition to the automatic Voice Guide, you can
have
frequency and other displayed data read out when you press
a
PF key.
62 Voice2 S-meter reading is read out when you press a PF
key.
63 RX monitor The squelch can be forced open for as long
as the PF key is
depressed. Useful for monitoring when setting CTCSS, etc.
64 RX DSP monitor The TS-480 will receive using the widest
passband available in
that mode for as long as the PF key is depressed. This is
a
quick way to check on nearby interference.
65 Main encoder
lock
You can lock the main encoder. This prevents unintentional
operation of the encoder when the transceiver is being used
in
a vehicle.
66 SEND key There is no SEND key on the control panel, but
this role can
be assigned to a PF key.
67 TX tuning Irrespective of the current operating mode and
power, this
function allows you to transmit a continuous carrier at a
fixed
output. Useful for configuring external devices.
68 LSB/USB toggle Toggle between LSB and USB when LSB (USB)
is displayed.
69 CW/FSK toggle Toggle between CW and FSK when CW (FSK)
is displayed.
70 FM/AM toggle Toggle between FM and AM when FM (AM) is
displayed.

35
71 TF-SET
72 Q MR
73 Q MI
74 SPLIT
75 A/B
76 M/V
77 A=B
78 SCAN
79 M >V
80 M.IN
81 CW TUNE
82 CH1
83 CH2
84 CH3
85 FINE
86 CLR
87 MTR
88 MHz
89 ANT 1/2
90 NB
91 NR
92 BC
93 DNL
You can assign a function you often use to a PF key on the
mic. Also, a function defined by pressing the key for 1 second
can be called up instantly. For example, if you find yourself
frequently switching between antennas, you can save time
if
you assign a panel PF key to ANT 1/2.
99 OFF No function is assigned to the PF key.

.. Making menus easier to use
Menu switching
There are so many different menu selections and parameters
to choose from that it is impossible
to remember them all. Consequently, the menu system can be
a little inconvenient when you need
to change several settings at once.
To solve this problem, the TS-480 offers two sets of menus:
A and B. Switching between these
can greatly simplify operations – for example, when
switching from DX to local, from regular to
data communications, or from fixed station to mobile operations.
Quick menu
The TS-480 offers many menu functions. If you know which
functions you use most of the time,
you can arrange for other functions to be hidden when selections
are displayed.
36

Fig.23: View from above (both models) Fig.24: View from
below (TS-480HX)
37
Structural Features
.. Internal structure of the main unit
The internal structure of the main unit is straightforward:
employing a die-cast aluminum chassis, it
is designed so that the circuit boards are attached from
both above and below. From above one
can see the TX/RX unit, the filter unit and the relay unit;
seen from below, there are the RF unit and
the final unit (or final/AT unit, in the case of the SAT
model). There is also a separate display unit in
the standalone control panel.
Figs. 23~25 illustrate the arrangement of these units.
Filter unit Relay unit
TX /RX unit
Final unit
RF unit
Final /AT unit
RF unit
Fig.25: View from below (TS-480SAT)

.. Cooling
In developing the TS-480HX, the most important issue when
it came to structural design was how
to arrange for sufficient cooling.
In order for this transceiver to be capable of 200W output
and yet have the same compact design
as the TS-50, we examined dozens of different cooling fans,
various circuit board patterns, and a
variety of different cooling fan layouts. After conducting
several hundred different types of heat
dissipation tests, we finally decided on the present structural
design of the TS-480.
The principle features of this structure are as follows:
… Improved cooling efficiency as a result of employing
twin cooling fans;
… Concentration of efficient cooling fins in one location
since space limitations meant that a normal
fin arrangement was not possible.
Fig. 26 illustrates how the TS-480 is cooled. The air that
is sucked in through the front panel and
the top and bottom of the case directly cools the surface
of those internal components that are
generating heat, such as the final section. At the same time,
it absorbs the heat that has dispersed
through the die-cast chassis before being expelled by the
twin cooling fans at the rear.
Fig. 26: Cooling diagram
Blue: Die-cast aluminum chassis Red: Heat flow from final
transistors
Brown: Circuit boards Gray: Air flow (from front panel on
left)
As you can tell from this diagram, the cooling fans located
at the rear must be powerful enough to
be able to suck in fresh air through the intakes on the front
panel. In order to make the TS-480 as
compact as possible the mounting density of the internal
components has been increased; for this
reason, we decided to install a pair of powerful cooling
fans so as to ensure a strong flow of air and
the increased cooling efficiency that would result.
38

The TS-480HX is equipped with 4 final transistors (2 in
the case of the SAT model), and the heat
produced by these disperses through the die-cast aluminum
chassis. In order to efficiently transfer
this heat outside the transceiver, cooling fins are absolutely
essential. We would like to provide as
many of these fins as possible, but in fact on more than
one occasion we have found that, owing to
space limitations, we were not able to fit in the normal
complement of cooling fins. In the case of
the TS-480, in order to make the transceiver compact we provided
a single row of tall, highly
efficient cooling fins right above the final transistors.
This compensated for the lack of cooling fins
dictated by the design restrictions.
Our decision to suspend the filter unit was made in order
to fit in as many cooling fins as possible
by packing in the components.
39
Figs. 27~29 are photographs of the
TH-480HX die-cast aluminum chassis.
The final transistors are positioned on the
four raised areas (circled) that can be seen
in the middle of the chassis (underside).
On the opposite side to the final transistors,
running across the middle of the upper side
of the chassis, can be seen a row of
relatively tall, flat cooling fins.
Fig. 27: Upper side Fig. 28: Underside
Fig. 29: Fin
The air that is sucked in from the front is divided into
two flows, one through the top of the chassis
and the other through the bottom. The upper flow of air must
pass through these high-efficiency
cooling fins, absorbing the heat from them before it is expelled
to the outside.
These fins, which also serve as a partition between the TXRX
unit and the filter unit, are set
diagonally so as to offer a degree of shielding.

Now let’s have a look at the rise in temperature of
the different parts when the TS-480HX transmits
continuously (14MHz) for 30 minutes at 200W. To provide a
comparison, plotted on the same
graph is test data compiled for a compact 100W model (designed
so as not to power-down during
continuous transmission at 100W).
Fig. 30: Temperature rise around final transistors
Fig. 31: Temperature rise of die-cast aluminum chassis around
GND terminal on rear
40

Fig. 32: Temperature rise measured at center of the upper
case of the main unit
As you will appreciate from these results, despite the fact
that the TS-480HX has an output of
200W, twice that of the comparison model, it boasts the same
or even better cooling performance.
It is not only designed not to power-down (for temperature
protection) during continuous, normal
transmission, but you can see that we have taken into full
consideration the rise in temperature
that occurs during continuous transmission.
Despite the fact that the TS-480 Series is compact, it has
the same heavy-duty specifications as
the previous, fixed station model. Nevertheless, electronic
components, whether from Kenwood or
another manufacturer, are generally susceptible to heat:
the higher the temperature, the shorter is
their working life. Therefore, in order that you can use
the product for a long time, we recommend
that you adjust output to suit conditions.
41

.. Standalone control panel
In the compact size range, virtually all transceivers are
designed so the control panel can be
removed and replaced. While this is convenient, owing to
the small dimensions of the main unit,
the area of the front panel is necessarily limited. Consequently,
in order to access the many
functions that are used in HF operations using only a limited
number of switches, hierarchical
menus are unavoidable.
As explained in the section on development objectives, we
started out with the premise that the
TS-480 would not be limited to mobile applications but that
it would be able to serve as a
reasonably priced 200W fixed station. So rather than going
for a simple appearance, we decided
on a standalone control panel in order to provide true operating
ease.
By separating the control panel from the main unit, its size
can be decided independently of the
cross-sectional area of the main unit. As a result, we were
able to realize just about the same
operability as one would expect of a conventional base station.
Naturally, at the same time we
adopted a large TN LCD, thus ensuring a responsive, easy-to-view
display.
For the main encoder, we picked a magnetic encoder with 250-pulse
resolution made by Copal
Electronics Corp., using software to quadruple resolution
to 1000 pulses per revolution. Since this
encoder uses the same components used in virtually all of
the models in Kenwood’s HF fixed
station lineup, even during mobile operations it should offer
the same operability as during fixed
station operations. In addition, by ringing the main encoded
dial with rubber we have further
improved operating ease, since it provides a good grip and
is more pleasing to the touch.
In addition, installed inside this standalone panel is a
66mm-diameter speaker. Since the speaker
grill is on the rear of the panel, you might wonder whether
it can deliver sufficient volume. However,
when you are actually using the standalone panel, you will
find that the sound is reflected off your
desk, the dashboard of your car, or the windshield, that
is indeed loud enough.
.. Design concept
The standalone panel of the TS-480 Series draws on the design
of the TS-2000. While inheriting
the best aspects of the former model’s design, the
new series represents an evolution in design
with added emphasis on the 3D look, sharpness, and the power
that is associated with 200W
output. Also, the case of the main unit has been given a
rounded form so as not to appear simply
as a box; its design creates the impression of aesthetic
unity.
The TS-2000 was mainly designed for fixed station operations,
so it has a silver-colored control
panel. The TS-480 is of course expected to be used more frequently
for mobile operations so a
black color scheme was chosen. Black helps to minimize light
reflection when used outside in
sunny conditions.
Of course the part of the transceiver that is most frequently
touched is the main encoder dial. Each
one is carefully machined and processed. After spin finishing,
it is treated with titanium-colored
alumite. The design of this main encoder dial is one of those
features the TS-480 has inherited
from the acclaimed TS-2000.
Of course, we were not exclusively concerned with design
aspects – for example, adopting backlit
rubber keys with a creamy-white base in order to improve
visibility, and mounting the speaker in
the rear of the standalone panel. We believe that our design
enhances visibility and operating ease
in both fixed and mobile operating environments.
42

New Option: Voice Guide & Storage Unit (VGS-1)
Developed at the same time as the TS-480, the VGS-1 can be
installed as an option. Combining in one unit the functions
of the
voice synthesizer unit (VS-3) and the digital recording unit
(DRU-3A) previously offered by Kenwood, the VGS-1 goes
beyond both of these.
Let’s now take a close look at the functions that are
available using
this unit.
.. Constant recording function
NEW
Haven’t you ever wondered if your callsign was being
used correctly by other stations while on a
DX’pedition? If you use this constant recording function,
you can record and playback the last 30
seconds of received audio or transmitted audio (sidetone
when operating in CW mode), allowing
you to check what was said afterwards. In addition, you can
use this handy feature for other
purposes, such as recording memos.
It could not be easier to use. From the menus, you set constant
recording to ON, and then all you
have to do is operate the CH3/REC key. If you press the CH3/REC
key for more than one second,
the last 30 seconds of audio data is recorded in flash ROM.
Then when you press the CH3/REC
key the audio data recorded in flash ROM is played back.
The audio data in held in flash ROM
until it is overwritten by a fresh recording. Note that when
recording to flash ROM, or when other
VGS-1 functions are in use, constant recording is temporarily
paused.
.. Message recording/playback function
If beforehand you record standard CQ messages such as your
callsign in the voice message
memory, you can transmit them repeatedly at will, a feature
that is extremely useful for
DX’peditions and contests.
The main features of this message/recording playback function
are as follows:
… There are three recording channels;
… You can record up to 30 seconds in each channel (using
all three channels this allows a
maximum of 90 seconds for message playback);
… Used in conjunction with VOX, message playback can be
used to switch between TX and RX;
… Repeat playback is possible;
… You can adjust the interval for repeat playback (0~60
sec.); and
… You can adjust recording level.
With VOX on, repeat playback on, and the interval set appropriately,
if you play back a
prerecorded message repeatedly, the TS-480 will automatically
switch between transmitting the
message and waiting for a response. There is thus no need
to sit in front of the mic and actually
repeat your message over and over again.
Even when you use a microphone with low sensitivity to record
a message, the TS-480 is
designed to set the appropriate recording level. Normally,
this recording level is automatically
linked to the mic gain setting, so if you wish to adjust
recording level manually, you should adjust
mic gain while recording is in standby. In message recording
mode, the ALC meter scale serves
as a recording level meter. As you speak into the microphone,
adjust mic gain so that the recording
level just crosses into the MAX zone occasionally. Even when
you record in this zone, the AGC is
designed to keep audio distortion to a minimum.
43

.. Voice Guide
Kenwood’s Voice Guide function is not the same as the
basic versions fitted in some transceivers
merely to announce the frequency. Of course, we have included
a frequency guide, but we were
convinced that a Voice Guide is an obvious and essential
feature for the menus and function
settings that are so crucial for daily operation.
The TS-480 has inherited intact those Voice Guide features
that have proved so popular in other
models. However, in addition we have enhanced the Voice Guide
functions for the different
configuration modes, and by making it possible to vary the
speed (5 levels) we have made sure
that this rig is even more user-friendly.
We have programmed the TS-480 Voice Guide so that it only
announces what has been changed
in configuration mode, menus, etc. Thus items that are unchanged
are not read out. Previously,
even if there had only been a change in the options, the
Voice Guide would read out each item:
“
menu”, menu number, option, and so forth. For the TS-480,
however, we have changed the Voice
Guide algorithm so that it only announces the option, enabling
swift confirmation without you being
forced to listen to unnecessary details being read out.
Normally, Voice1 is assigned to a PF key on the control panel
to read out operating frequency,
channel number, the settings for each function, and so on.
However, if you reassign a PF key
(using menu #48) to #62, by switching to Voice2 you can hear
the S-meter level being read out.
Introduced here are a few of the benefits of the TS-480 Voice
Guide. Some of these are automatic,
while others are accessed by the PF keys.
1. Reset
When the power is switched on, if you press the power switch
together with either A/B or A=B, the
Voice Guide will automatically respond with the query “VFO/FULL
RESET?”
2. Configuration mode for TX output, etc.
When the PWR switch is pressed, the Voice Guide will automatically
respond with “TX PWR” plus
the option. If you change the option using the MULTI/CH encoder,
just the new option will be
announced. With previous models if one pressed the PF key
at this point, the frequency would be
read out, but the TS-480 announces the setting plus the option.
3. Frequency lock
Whenever the MENU button is pressed for more than 1 second,
the Voice Guide will automatically
respond with “FREQUENCY LOCK ON” or “FREQUENCY
LOCK OFF”, whichever is appropriate.
4. Menu settings
If the MENU button is pressed, the Voice Guide responds with “MENU” plus
the menu number
and the option. If you change the option using the MULTI/CH
encoder, the menu number and
option will be announced. If the .. and .. keys are pressed,
just the option will be read out. For the
options actually announced for the various menu items, please
refer to the menu list provided in
the instruction manual.
5. Split mode
If you press a PF key during split operations, the Voice
Guide will read out VFO + S + A +
frequency. (Here “S” stands for split mode, while “A” means
VFO A.)
44

6. VFO mode, direct frequency entry
Let us say you are operating at 7.033MHz and in VFO mode
you press the PF key, the Voice
Guide will announce “VFO”, “A” or “B”,
and 7.033.00. If you use the key pad to input ENT, 2, 1,
1, 9,
5, ENT, you will hear each key announced – “Enter”, “2”, “1”, “point”, “1”, “9”, “5”,
and finally “Enter”.
On confirming with the Enter key, you will hear a beep to
indicate “T” and then the input frequency
will be read out. Note that in memory channel mode you can
also specify channel number for
frequency entry.
7. Memory channel
Let us imagine that the last memory channel you used was
89. Selecting memory channel mode
from VFO mode will cause the Voice Guide to announce “Channel”, “89” and
the stored frequency.
Selecting memory scroll mode from VFO mode will cause the
Voice Guide to announce “Memory
in”, the channel number, “Blank” if the
channel is unused or the stored frequency if it is in use.
To
store a frequency in a memory channel, pick the desired channel
and once again press QMI; you
will hear a beep to indicate “T” and the data
will be written to the memory channel. It will return to
VFO mode when the write has been completed. With quick memory
mode, you can call up a
stored frequency with QMR and the Voice Guide will announce “Quick
Memory”, the channel
number and the stored frequency.
8. Variable Voice Guide speed
With Menu #16 you can adjust the speed (5 levels) of the
Voice Guide to suit your preference. The
factory setting is level 1. Note that as the speed increases,
the tone of the voice changes.
9. S-meter level
By assigning the Voice2 function to a PF key, you can hear
the S-meter level being read out,
according to the table below. (After operating PF(VOICE2))
Meter level Voice guide Meter level Voice guide Meter level
Voice guide
0 S0 7 S5 12 10dB
1 – 3 S1 8 S6 13 – 14 20dB
4 S2 9 S7 15 30dB
5 S3 10 S8 16 – 17 40dB
18 50dB 6 S4 11 S9
45
19 – 20 60dB
Other features
This is not connected with the Voice Guide, but the TS-480
is also equipped with a feature that has
proved popular on previous models – namely, it issues
a beep that serves as an SWR alert when
an error is detected in Morse mode with AT tune.
Also, the TS-480 offers a range of beep functions to facilitate
operations. These include issuing an
“
end stop beep” to mark an end stop for options, differential
beeps to distinguish between ON and
OFF when toggling a key, or to distinguish between configuration
mode and completion when
adjusting TX output, etc.
Note:
For those people who do not require the Voice Guide, it is
possible to disable it by simply turning
the volume to OFF. Just proceed to menu #15 and select OFF.

New Option: ARCP-480 (Amateur Radio Control
Program for TS-480) Freeware
Kenwood’s ARCP software has
proven very popular. For the
TS-480 we have made some
significant improvements, releasing
it as “ARCP-480”.
KNS added
ARCP-480 is compatible with the
Kenwood Network Command
System, enabling control of the
TS-480 over a network and, using
H.323 (VoIP), making voice
transmission/reception possible.
So that you can enjoy easy control
of the TS-480 from your computer,
both ARCP-480 and ARHP-10 programs (explained later) are
available free and can be
downloaded from Kenwood’s website.
URL: http://www.kenwood.com/i/products/info/amateur.html
There is ARCP software for the TS-870 and TS-570, as well
as for the TS-2000. As with
ARCP-2000 and the TS-2000, the new ARCP-480 program allows
you to control virtually all of the
functions on the TS-480 transceiver. What follows is an explanation
of the major differences
between ARCP-2000 and ARCP-480.
.. Main functions
1. Button layout & basic operation
Just as when one uses the tuning control on the TS-480 to
change frequency,
how one changes frequency with ARCP-480 is very important.
We have made
the ARCP-480 software easier to use by improving the way
you use the
mouse to change frequency.
Click on the tuning control icon to enter tuning mode. To
raise the frequency,
keep your finger on the left mouse button while turning the
mouse to the right.
Similarly, to lower the frequency, keep your finger on the
left button while
turning the mouse to the left. To return to normal operations
exit tuning mode.
If you want to use a wheel mouse* to change frequency, you
can of course work in tuning mode
but even when tuning mode has not been selected the wheel
can be used to change frequency by
whatever increment has been set in Click Enc./Step.
(Step no.)
Note that if the TS-480 is currently in a configuration mode,
these actions will effectively change
the settings. But in this case a message is displayed, so
you can exit from configuration mode
before continuing.
*This feature is only compatible with a genuine Microsoft® IntelliMouse® and
driver.
46

2. Changing memory and registered details
You can change any registration data from the
appropriate window. You use this window when
storing new data in memory. Display the
frequency you wish to register and press M.IN.
Then pick the channel (0-89) you want to write to
and press DISP: the memory window (right) will
open. This window now allows you to pick split
operations. If you wish to switch to split mode,
check the TX/End Frequency checkbox and you
can then enter the frequency for the TX station as split
memory. By clicking on the box displaying
the frequency you can input the desired frequency, and you
can also store it. As with ARCP-2000,
you can input memory names in this window.
3. CW keying
You can also use ARCP for keying. If you think you may have
made a mistake while keying,
ARCP-480 allows you to click the Stop button to prevent the
message from being sent, although
with previous versions of ARCP you could not do this. Also,
you can enter special codes (with a
few exceptions) from the keyboard.
Since you can now enter BT and other
special codes from the keyboard, you do
not have to move your hands from the
home position during a QSO. Also, the
software now allows you to stretch the log
window, which is useful when it becomes
filled with messages. The window can be
closed even during transmission by just
pressing the ESC key.
ARCP-480 does not allow direct keying by
typing, but for it is a fully practical solution
for regular QSO.
47
Special code input
Special code Key / Display Special code Key / Display
BT “[“ AS “<“
KN “]” AR “_”
BK “\” HH “#”
SK “>“ SN “%”

4. Reading and writing files
With ARCP-480 you can write memory channel and menu data
to a file for later recall. This does
not apply in certain cases when using KNS.
.. Compatibility with KNS (Kenwood Network Command System)
KNS is the name for the system that enables remote control
of the transceiver over a LAN or
WAN; ARCP-480 is equipped with the remote functions for this
system. To use KNS, you need to
have at least 2 computers, the remote one having ARCP installed
and the host computer having
ARHP installed.
The basic arrangement is to connect the TS-480 to a host
computer, which is on a LAN, and to
install ARHP-10 on this computer. ARCP-480 is then installed
on the remote computer.
RX audio & control commands TX audio & ARCP commands
48

When the system is operating, RX audio and the commands
that control ARCP are sent from the
host PC, along with the TX audio and commands controlling
the transceiver.
Using this combination of ARCP-480 and ARHP-10, in order
to be able to communicate by voice,
and to be able to hear the sidetone when keying, both the
host PC and remote PC must be
running Windows® 2000 (SP3 or later) or Windows® XP
(SP1 or later). For voice exchanges, the
remote PC must be connected to a microphone for TX audio
input, and to a speaker for receiving
audio. These are both plugged into a sound card.
Accidental continuous TX
Inasmuch as KNS is a network-based method for performing
remote control over a network, it is
possible that, through some malfunction, the TS-480 installed
on the host end might go into
continuous transmission accidentally.
By setting the time-out timer on the TS-480, it is possible
to ensure that, after the set time period
has passed, the transceiver will automatically switch back
to RX mode. The timer count always
starts with the commencement of transmission, so even in
the case of a prolonged but intentional
transmission, after the set period has passed it will switch
back to RX; nevertheless, it is a good
way to prevent the transceiver from going into continuous
TX mode.
In the event that, following the start of transmission, some
network problem arises that prevents
you from executing the command for the transceiver to switch
back to RX, the ARHP-10 software
itself is equipped with a function* that, after the passage
of a fixed period of time, will switch the
transceiver back to RX mode. However, please make sure that
you can obtain rapid access to the
host if a malfunction occurs.**
*This software cannot handle every problem that may occur.
**In Japan only. For details, refer to the laws governing
radio transmissions.
Setting up KNS on the ARCP side
First check the LAN/WAN. Ensure that
everything is set up correctly, referring to the
second section on ARHP10, ARCP-480 Help,
and the instruction manuals for your network
devices.*
Before setting up the host side for KNS, you
should first check with the administrator of the
host computer and obtain all necessary
information. This includes the KNS host address,
the command port number, user name and
password, and guidance on how to connect the
audio cable.
Within the setup window, you should fill in the
necessary information in the KENWOOD
NETWORK COMMAND SYSTEM frame. If the
To: combo box is empty, this means that no KNS host has been
selected. You should input the
host for the connection using the Setting and Add buttons.
In the KNS Connection Settings window, you should input the
name of the other computer as the
connection name, together with its description. For the address,
input the IP address of the other
computer. You must also input user name and password. If
you are going to use voice
49

communications and the operating system on
either end is compatible, check the Voice box.
(It is possible to enter the description using
double-byte characters. For the address, it is
also possible to enter the domain name,
provided that it can be resolved by DNS.)
Once you have finished, return to the setup
window, select the other computer in the To:
combo box, and check the box labeled Use
Network Command System. In the TX Control
frame, check DTS if the audio cable is
connected to the data terminal of the
transceiver; check PTT if it is connected to the mic and
EXT-SP terminals. When you are finished,
click on OK.
The next step is to make the connection by clicking on CON,
as you would with any other ARCP
software. If a normal connection is established, the green
indicator lights on the CON button.
When you are connected using the KNS system, certain functions
are not available. For details,
refer to ARCP/ARHP Help.
* In order to remotely control a transceiver via a
WAN, you must apply for permission. For
details, refer to the instruction manual and the
materials available on our website. Once you have obtained
permission, you can use KNS for
remote control, but please make sure you follow correct operational
procedure. The above applies
to remote control operations within Japan.
To use KNS via a WAN, you must obtain global IP addresses
for the computers running
ARCP and ARHP to enable external access. Note that that when
you open a broadband router
port you do so at your own risk.
50

Using a broadband router
Many people using the Internet today use a broadband router
(hereafter referred to simply as a
router), but in order to use KNS in a setup that has routers
installed at both the host and remote
ends, you need to configure each end separately. With KNS,
for transmission and reception using
the TCP protocol you need to open one port for commands and
several ports for VoIP. If a router is
compatible with Microsoft® NetMeeting®, by setting
it up correctly you should be able to make use
of H.323 (VoIP) voice transmission/reception. For using only
ARCP control, you open port 50000
(default) for bidirectional communications using the TCP
protocol. If you also want to use VoIP
audio communications, you would normally have to open the
following ports:
Ports: 389, 522, 1503, 1720, 1731Protocol: TCP
Direction: bidirectional
Ports: dynamically assigned ports in the range 1024-65535
Protocol: TCP/UDP
Direction: bidirectional
Note that even if the router is compatible with Microsoft® NetMeeting®,
you must open the port for
ARCP control for TCP in both directions. To conduct voice
communications, in most instances
ports 1503 and 1720 are opened and, if needed, NAT (Network
Address Translation) set up to
enable the two parties to converse via VoIP. If you are using
a router that is not compatible with
Microsoft® NetMeeting®, you may not be able to conduct
voice communications via VoIP, even
with the communications ports open and the correct NAT settings.
If you are using a router with a built-in xDSL modern, it
may be possible to enable KNS with the
correct bridge settings.
Once you have opened all these ports, you must be careful
about security. Also, if you configure a
bridge, you may require a client and another router externally
to use PPPoE* authentication. When
using a PPPoE client, refer to the relevant instruction manual
to ensure that everything is set up
correctly, and please remember that you use this feature
so at your own risk. Note that a PPPoE
client is available as a standard feature of Windows® XP.
Before opening router ports and making changes to your PC
settings and to your network, you
should first carefully read the instruction manuals for the
hardware. And remember you do so at
your own risk. Should you make a mistake, you may cause the
network to fail or make it
vulnerable to intruders.
51

New Option: ARHP-10
(Amateur Radio Host Program) Freeware
ARHP-10 is the host application for
use with the Kenwood Network
Command System. As was
explained in the section on
ARCP-480, if ARHP-10 is installed
on the host computer it can serve as
the host in a KNS connection.
1. Make an audio/voice cable &
connect the TS-480 to your PC
To conduct voice communications
you require a PC with the Windows®
2000 operating system or a later Windows OS, but in addition
you need to connect the transceiver
to the PC with an audio cable.
Kenwood does not supply a cable for this purpose so
you must make up one by yourself. When doing this,
please refer to the wiring diagram on the right.
Illustrated here is the wiring diagram for a cable that uses
the DATA connector. It is also possible to make up a
cable that uses the MIC terminal; to make such a cable,
you will need a RJ-45 crimp tool to attach the connector.
For the MIC terminal wiring diagram, please refer to the
instruction manual.
If using the MIC terminal, you will need a cable in order
to
hear the audio received by the TS-480; this connects the
transceiver’s EXT-SP terminal to the input terminal
on
the PC sound card.
2. Checking LAN settings
In order to operate KNS, you must first check the correct
settings (operating system, home LAN devices).
In regards to a LAN, by ensuring that each device is set
up correctly, communications should be
possible; however, if the connection is made via a WAN, one
can suppose that as a result of
various network problems, commands and/or voice may not get
through properly. Even in such
cases, you may find that the problem can be solved by changing
the network device settings.
Depending on the service offered by your Internet provider,
you may find that you cannot obtain a
global IP address or that commands and/or voice are not getting
through.
Also, if you are using a router to access the Internet, in
addition to opening the command port for
sending and receiving with TCP, if the router is compatible
with Microsoft® NetMeeting®, by
making the appropriate “port open” setting it
should be possible to conduct voice communications
when KNS is active. Be sure to read carefully the instruction
manual before changing the settings
on any network device. You do so at your own risk.
52

3. Adjust PC volume
Whether hosting via a WAN or within a LAN, it is recommended
that you test your setup at least
once using a KNS environment arranged with host and remote
on the same LAN. This should
allow you to adjust volume to the appropriate level. To adjust
terminal level, display the recording
control, confirm that MIC input is selected, and adjust the
level. For speaker output level
adjustment, adjust WAVE.
4. User setup
Open the setup window and set the
COM port to be used for commands,
whether or not to use voice
communications, session time, and
whether or not to keep a log. By clicking
on Add, you can then input the name
and password of the user to connect.
The host administrator then informs the
remote PC user of the above user name
and password, as well as other relevant
information such as how to make up an
audio cable (for use with either the DATA
terminal or MIC/EXP-SP). The remote
PC user can then connect to this host
using the information provided.
Note that a red X mark within the user
frame indicates that this user is
temporarily barred from connecting to the
host.
After the setup is completed, you can return to the main
window and click on CON; the button will
then appear yellow. This completes the setup: the host is
now ready for the remote PC user to
make a connection.
Once the audio cable has been made up, connect the various
cables to your PC as illustrated
below.
In addition, connect your PC to the TS-480 with an RS-232
cable.
53

54

.. Troubleshooting
Listed below are typical problems that you might encounter.
55
Network & Operations
Problem Solution
Is it possible to use an analog
dial-up connection?
We recommend a broadband connection. Otherwise, if
you have a narrowband connection of about 50kbps, it
might work, though this will depend on network traffic
conditions. You must also expect to encounter some noise
and to lose audio contact intermittently.
I have broadband but is it
compatible?
Yes, it is compatible provided that your ISP provides a
global IP address, VoIP ports, and a command port.
Can I use my router with
KNS?
We do not guarantee that KNS will work through a router.
Nevertheless, if your router offers DMZ or “virtual
computer” features, you may be able to set it up by
yourself to enable KNS to work properly.
You will have to make the required adjustments, referring
to the instruction manuals for the devices you are currently
using, at your own risk. Generally speaking, you can use
any modem that is compatible with Microsoft®
NetMeeting®. If your operating system is XP, switch off
the
ICF (personal firewall) provided by Windows®.
With a high-speed modem
connected directly to my PC
running Windows® XP, KNS
does not work.
If the ICF (personal firewall) of Windows® XP is switched
on, you should switch it off; however, be aware that this
can represent a security risk.
I am using a high-speed
modem connected directly to
my PC, but the modem is
inside the router.
… Switch to a modem that is not inside a router.
… Open the ports required for KNS: a command port and
H.323 control ports (if the router is compatible with
Microsoft® NetMeeting®).
… If you must use a router with built-in modem, try setting
up a bridge. In this case, however, some ISPs will not
issue an IP address. To solve this, you can either set up
another router (compatible with Microsoft®
NetMeeting®) externally, or have an IP address issued
using a PPPoE* client.
(A PPPoE* client is available as a standard feature of
Windows® XP.)
Be aware that you do all of this at your own risk.

56
I cannot get KNS to work
over the Internet connection
that is provided as a
collective service to my
apartment block.
It is possible that one of more of the ports required by
KNS
is blocked. Talk to your network administrator to see if
the
requisite ports can be opened.
Can I use a software-based
firewall?
KNS will probably work with your firewall, provided that
it is
set up for the ports required by ARCP and ARHP to be
open.
I want to time-out TX after a
set time.
Set the TOT to whatever duration you require. However,
since this simply times your transmission, once the time
is
up, it will return the transceiver to RX even if you are
in the
middle of transmission.
Is KNS compatible with
digital communications
(PSK31, SSTV, etc.)?
There is a delay with KNS. If you are using a WAN, this
delay increases, so it is not suitable for the various types
of
digital communications or other operations that demand a
quick response. It is also not recommended if audio quality
is a priority.
Is KNS compatible with full
break-in or quick break-in
times?
Owing to the delays inherent in a network, this system is
not compatible with full break-in. For this same reason,
it is
also not recommended for operations that require strict
TX/RX timing (contests or pileups). Also, break-in time
should be set longer than usual.

57
Sound
Problem Solution
The sound does not get
through (host PC).
First check that the audio cable is connected properly.
… Check what audio input method (MIC/EXP-SP or
DATA) has been selected for the transceiver.
•
If the DATA terminal is used:
Use menus #46 & #47 to check that I/O levels are
correct.
•
If MIC/EXT-SP is used:
Check that AF level and mic gain are correct.
•
Check your computer:
Check that the computer can produce sound; update
drivers as necessary.
… Connect the transceiver’s RX audio to the input
of your
computer and bring up the recording control window.
Check that the input terminal you are using is active and
that it is set to an appropriate level. Bring up the
playback control window; make sure that it is not muted
and that it is set to an appropriate level. Check that you
can hear something from the speakers connected to
your computer. After you have completed these checks,
mute the PC output.
… Check that you are using a compatible operating
system.
… Check that Voice is checked in the ARHP-10 setup
window.
… If using a WAN, check that KNS will work locally over
your LAN.
… If using a WAN, check your communications hardware
and ISP settings. (If you are using a router, try removing
it temporarily to see if that makes a difference.)
Check that KNS VOICE is illuminated in the ARCP-480
display. If it is not, recheck your operating system for
compatibility and also your network settings (including your
ISP service).
The sound does not get
through (remote PC).
First check that the host audio is connected properly.
… Check what audio input method (MIC/EXP-SP or
DATA) has been selected for the transceiver on the host
side.
•
If the DATA terminal is used:
Use menus #46 & #47 to check that I/O levels are
correct. (Normally, there would be no need for the
remote PC user to think about this.)
•
If MIC/EXT-SP is used:
Check that AF level and mic gain are correct.
•
Check your computer:

Check that the computer can produce sound; update
drivers as necessary.
… Connect a microphone to the computer and bring up
the recording control window. Check that the input
terminal you are using is active and that it is set to an
appropriate level. Bring up the playback control window;
make sure that it is not muted and that it is set to an
appropriate level. Check that you can hear something
from the speakers connected to your computer.
… Check that you are using a compatible operating
system.
… Check that Voice is checked in the ARHP-10 setup
window on the host computer.
… Check that KNS VOICE is illuminated in the ARCP-480
display. If it is not, recheck the host computer operating
system for compatibility and also the network settings
(including the ISP service for the host computer).
… If using a WAN, check that KNS will work locally over
your LAN.
… If using a WAN, check your communications hardware
and ISP settings. (If you are using a router, try removing
it temporarily to see if that makes a difference.)
… Check that Voice is checked in the ARCP setup
window.
… Check the modulation line. Check that the host PC
audio cable connection method in the TX Control frame
of the Setup window is the same.
58
TX/RX audio breaks up, is
distorted or faint.
… Bring up the playback and recording control windows
on both host and remote computers and try adjusting
the levels.
… If the RX audio seems faint, and if the Line-in terminal
is
being used for input on the host computer, try switching
to the Mic-in terminal.
… If modulation seems faint during TX, and if the Line-out
terminal is being used for output on the host computer,
try switching to the Speaker-out terminal.

TS-480 In-Depth Manual
Published in April 2004 by Kenwood Corporation
Communications Equipment Division
Unauthorized reproduction is forbidden.
Copyright © 2004 KENWOOD CORPORATION