Kenwood TS-820S User Manual

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This manual has been written basically for use of model T5-8205. The
difference between models T5-8205 and T5-820 is that model T5-8205 has
digital display built-in as against model T5-820 has no digital display built-in.
Accordingly. if you have purchased model T5-820. you may skip over the

passages concerning digital display.

CONTENTS

TS-820S SPECIFICATIONS SECTION 1 FEATURES ,..

SECTION 2 INSTAllATION , 2.1 Unpacking

2.2 Operation location

2.3 Power Connections

2.4 Antenna

2.5 Microphone

2.6 Key

2.7 External Speaker and Headphone

2.8 RTTY (FSK)

2.9 Ground

SECTION 3 OPERATING CONTROLS 3.1 Front Panel Controls

3.2 Rear Panel Controls

SECTION 4 OPERATING INSTRUCTIONS

4.1 Preliminary Procedure

4.2 Receiver Tuning

4.3 Reading the Operating Frequency

4.4 Calibrating the Frequencies

4.5 RF GAIN

4.6 RF ATT

4.7 RIT

4.8 IF Shift

4.9 Noise Blanker

4.10 AGC (Automatic Gain Control)

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4.11 Transmitter Tuning

4.12 SSB Operation

4.13 CW Operation

6

4.14 Operation with a Linear Amplifier

4.15 Fixed Frequency Operation

4.16 Internal Cross Channel Operation

4.17 Mobile Operation

4.1 B DX Operation (Use of Processor)

4.1 9 RTTY Operation

4.20 SSTV (Slow Scan TV) Operation

4.21 Operation with a Phone Patch

4.22 Use of Monitor Switch

TS-820 BLOCK DIAGRAM 24

9

SECTION 5 CIRCUIT DESCRIPTION .., 26

5.1 Block Diagram

5.2 Board and Unit

6.3 Final Stage Power Amplifier

SECTION 6 MAINTENANCE AND ALIGNMENT 33

6.1 General Information

6.2 Accessories

6.3 Adjustment of Receiver Section

6.4 Adjustment of Transmitter Section

SECTION 7 TROUBLESHOOTING ,

TOP and BOTTOM VIEW OF THE TS-820

SCHEMATIC DIAGRAM

42
43

-IMPORTANT

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TS-820S SPECIFICATION

r-

FREQUENCY RANGE

MOD E ~ POWER REQUIREMENTS

PLATE POWER INPUT

AUDIO INPUT IMPEDANCE ...

AUDIO OUTPUT IMPEDANCE

AUDIO OUTPUT RF OUTPUT IMPEDANCE., FREQUENCY STABILITY,

160 meter band -1.80 to 2.00 MHz

80 meter band -3.50 to 4.00 MHz
40 meter band -7.00 to 7.30 MHz
20 meter band -14.00 to 14.35 MHz

15 meter band -21.00 to 21.45 MHz
10 meter band -28.00 to 28.50 MHz (A)
10 meter band -28.50 to 29.00 MHz (B)
10 meter band -29.00 to 29.50 MHz (C)
10 meter band -29.50 to 29.70 MHz (D)

WWV -15.0 MHz (receive only)
use. LSB. or CW, FSK

1120/220 VAC. 50/60 Hz operation

200 watts PEP for sse operation

160 watts DC for CW operation

~at!! for FSK operation

13BV DC operation

120 watts PEP for sse operation

90 watts DC for CW operation
60 watts for FSK operatio~-

50 k ohms (high impedance)
4 to 16 ohms (speaker or headphones)
More than 1.5 watts (with less than 10% distortion) into an 8 ohm load.

50 ~ 75 ohms

AUDID FREQUENCY RESPONSE

CARRIER SUPPRESSION SIDEBAND SUPPRESSION IMAGE RATIO. HARMONIC RADIATION SPURIOUS RADIATION IF REJECTION , RECEIVER SENSITIVITY RECEIVER SELECTIVITY

TUBE AND SEMICONDUCTOR

COMPLEMENT

DIMENSIONS

WEIGHT

Within 100 Hz during any 30 minute period after warmup

Within :.t 1 kHz during the first hour after 1 minute of warmup
400 to 2600 Hz. within -6 db

Carrier better than 40 db down from the output signal

Unwanted sideband is be~ter than 50 db down from the output signal
Image frequency better than 60 db down from the output signal

Better than 40 db down from output signal

Bet~er than 60 db down from output signal (without harmonic radiation)

I F frequency is 80 db or more down from output signal

0.25 JlV S+N/N 10 db or more

SSB: 2.4 kHz bandwidth (- 6 db down)

4.4 kHz bandwidth (- 60 db down)

CW.: 0.5 kHz bandwidth (- 6 db down)

18kHz bandwidth (- 60 db down)

.(with optional CW filter installed)

1:o-tl205

Tubes
IC'S
FET'S
Transistors

DiOdes

38
31
95

195

3

30
74

167

3
5

13.2" wide x 5.9"high x 13.2" deep

37.4 Ibs.

3

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SECTION 1. FEATURES

1. Pll System, HF Band SSB!CW!RTTY
Transceiver

This transceiver employs newly developed PLl (Phase
Locked loop) circuit covering 1 8 to 29.7 MHz (WWV

15 MHz) for SSB, CW and ATTY operations

2. Minimum Spurious and Excellent Overload
and Crossmod. Characteristic

The adoption of FET balanced type mixer. MaS FET and
single conversion system minimizes spurious during
transmission and assures excellent overload and cross-

mod. characteristic during reception.

3. Built-in IF SHIFT Circuit

IF SHIFT circuit is built in the transceiver to shift IF pass
band without changing receive frequency The circuit is
also called the "pass band tuning circuir., It allows you
to eliminate radio interference or set the receive fre-

quency characteristic to the desired bandwidth simply

by manipulating one C<;Introl knob

4. Built-in RF Processor

The unique speech processor uses a quick time constant

at 455 kHz. Since this circuit is of RF type, it produces

little distortion and, unlike the clipper system, does not
deteriorate the tonal quality

5. RF NFB

RF NFB from the transmit final stage to the driver stage
improves the cross modulation distortion. The use of

the amplification type AlC further improves the quality
of transmit signals

6. Newly Designed Analog Dial
The combination of newly designed mono-scale and su-

b-dial provides easy reading of frequencies. The adop-

tion of a circuit that is completely free from changes in

carrier frequencies permits accurate indication of fre-

quencies on one dial pointer.

7. Digital Display Dial
The digital dial of TS-820S indicates transmit and

receive frequencies using carrier. VFO and local oscil­lator signals instead of converting VFO frequencies.
Thus. accurate frequencies can be read at all times at

any band and any operating mode.
Since the accuracy of frequencies is set up only by the
10 MHz standard oscillator. frequencies can be read ac­curately up to 100 Hz order by calibrating the oscillator

with WWV.

The green indication on the dial assures many hours of
fatigue less operation

8. D.H. (Displav Hold) SWITCH
BV pressing the DH switch. the frequency read on the
digital remains on. thus serving as a memory system

9. Rigid Structure and Easy Operation
The transceiver is built with a die casting front panel

and a rigid chassis, providing outstanding mechanical

stability for mobile operation All the operating parts
such as control knobs and dials are designed and arran-

ged according to human engineering technology to en-

sure maximum case of operation

10. Monitor Circuit
The monitor circuit allows you to hear your own voice

during transmission. which is normally impossible with
collventional transceivers This is very useful when
checking the modulation condition or adjusting tho AF

processor

11. Selector Switch for SSB/CW Receive

Frequency Response

During CW reception the audio frequency response IS
automatically narrowed to improve the clarity of sound.

12. Build-in Fixed Channel Circuits with AIT

(crystals are optionall
The fixed channel circuits with AIT permit the Uie with

the built-in VFO for more enjoyable operation

13. Transverter Connector

Transverter TV-502 (2m) can be connected for ready
operation. Changeover to HF or VH F is accomplished

automatically with the power switch of the transverter.

14. ,Built-in AC Power Supply. and DC Operation with

Optional DC-DC Converter

DC- DC Converter DS-1 A (option) can be attached to

the transceiver for mobile operation.

16. Wide Variety of Auxiliary Circuits
and Devices

The transceiver is completed with a noise blanker

circuit, VOX circuit, side tone circuit, marker cIrcuit,

built-in speaker. 3-position AGC switch, heater swItch.
IF OUT terminal and linear terminal
The following devices are available as optional extra:

Remote VFO (VFO-820), CW Filter (YG-88CI, Digital

Display (DG-1 AI. Transverter (TV-502S). Microphone

(MC-50), Low Pass Filter (Lf-30A)

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2.1 UNPACKING

Remove the TS-820S from its shipping box and packing

material and examine it for visible damage. If the equipment
has been damaged in shipment. save the boxes and packing
material and notify the transportation company immedia­tely. It is a good idea to save the boxes and packing material

in any case because they are very useful for shipping or mo­ving the equipment.

The following accessories should be included with the trans­ceiver:

1 Operating Manual
1 Microphone Plug
1 Jumpered 9-pin Plug (installed)

5 RCA Phono Plugs

1 Alignment Tool

2 Plastic Extension Feet

with Screws
1 AC Power Cord
1 Speaker Plug
1 8P US Plug
4 Fuse (6A x 2, 4A x 2) .

2.2 OPERATION LOCATION

As with any solid state electronic equipment the TS-820S

should be kept from extremes of heat and humidity.
Choose an operating location that is dry and cool. and avoid
operating the transceiver in direct sunlight. Also. allow at

least 3 inches clearance between the back of the equipment
and any object. This space allows an adequate air flow from

the ventilating fan to keep the transceiver coo).

2.3 POWER CONNECTIONS

Make sure the POWER switch on the front panel of the

TS-820S is turned oft. the stand-by switch is put in the REC

position. and that the voltage switch on the back of the

TS-820S is switched to the correct line voltage (120 or 220.)

Connect the POWER cord to an appropriate external power

source.

2.4 ANTENNA

Connect a 50 ~ 75 ohms antenna feedline to the coaxial
connector on the rear panel.

Fixed Station -Any of the common antenna systems desi­gned for use on the high frequency amateur bands may be

used with the TS-820S. provided the input impedance of the
transmission line is not outside the capability of the pi-out­put matching network. The transmission line should be of
the coaxial cable type. An antenna system which shows a
standing wave ratio of less than 2 : 1 when using 50 or 75
ohm coaxial transmission line. or a systerp that results in a
transmission line input impedance that is essentially resisti-

ve. and between 15 and 200 ohms will take power from the
transceiver with little difficulty. If openwire or balanced type
transmission line is used with the antenna. a suitable an­tenna tuner is recommended between the transceiver and
the feed line. Methods of construction and operating such
tuners are described in detail in the ARRL Antenna Hand­book. and similar publications. For operation on 75 and 40
meter bands. a simple dipole antenna. cut to resonance in
the most used portion of the bands. will perform satisfacto-

rily. For operation of the transceiver on the 10. 15. and 20
meter bands. the efficiency of the station will be greatly in­creased if a good directional rotary antenna is used Re­member that even the most powerful transceiver is useless
without a proper antenna.

Mobile Station -Mobile antenna installations are critical.
since any mobile antenna for use on the high frequency
bands represents a number of compromises. Many ama­teurs lose the efficiency of their antenna through improper
tuning. Remember the following points when using the

tS-820S with a mobile antenna.

The "Q" of the antenna loading coil should be as high as
possible. There are several commercial models available
which use high "Q" coils.

The loading coil must be capable of handling 1tle power of

the transceiver without overheating. In the CW mode the
power output of the transceiver will exceed 80 watts.

The SWR bridge is a useful instrument. but unfortunately it

is quite often misunderstood. and overrated in importance.
Basically. the SWR bridge will indicate how closely the an­tenna load impedance matches the transmission line With

long transmission lines. such as will be used in many fixed

station installations. it is desirable to keep the impedance

match fairly close in order to limit power loss. This is parti-

cularly true at the higher frequencies. The longer the line.
and the higher the frequency. the more important SWR be­comes. However. in mobile installations the transmission

line seldom exceeds 20 feet in length. and an SWR of even
4 to 1 adds very little power loss. The only time SWR will

indicate a low figure is when the antenna presents a load
close the 50 ohms. but many mobile antennas will have a

base impedance as low as 15 or 20 ohms at their resonant
frequency. In such a case, SWR will indicate 3 or 4 to 1,

and yet the system will be radiating efficiently.

The really important factor in your mobile antenna is that is

should be carefully tuned to resonance at the desired fre-

quency. The fallacy in using an SWR bridge lies in the fact

that it is sometimes possible to reduce the SWR reading by
detuning the antenna. Field strength may actually be redu­ced in an effort to bring SWR down. Since field strength is
the primary goal. we recommend a field strength meter for

antenna tuning.

5

For antenna adjustments. the transceiver may be loaded
lightly. using the TUN position instead of operating at full

power output. This will limit tube dissipation during adjust-

ments. and will also help to reduce interference on the fre-

quency In any case. do not leave the transmitter on for very

long at one time Turn it on just long enough to tune and
load. and get a field strength reading. Start out with the an­tenna whip at about the center of its adjustment range. Set
the VFO to the desired operating frequency and then adjust

the PLATE control for a dip. and then the LOAD control

Then observe the field strength' redding The field strength

meter may be set on top of the dash. on the hood. or at an

elevated location some distance from the car.

Change the whip length a half inch. or so at a ti.me. retune

the finals each time. and again check the field strength at the

antenna. Continue this procedure until the point of maxi-

mum field strength is found. This adjustment will be most
critical on 75 meters. somewhat less critical on 40. until on

10 meters the adjustment will be quite broad. After tuning

the antenna to resonance. the finals can be loaded to full po­wer.

2.5 MICROPHONE

Attach the microphone connector to a suitable microphone
as shown in Figure 2 Be sure that the PTT switch of the mi-

crophone is separate from the microphone circuit. as shown
in Figure 3.

It should be noted that a microphone with a 3 P plug having

a common earth terminal cannot be used.

The microphone input is designed for high impedance (50k

ohms) microphones only. The choice of microphone is im­portant for good speech quality. and should be given serious
consideration. The crystal lattice filter in the transceiver pro­vides all the restriction necessary on audio response. and
further restriction in the microphone is not required. It is
more important to have a microphone with a smooth. flat re-

sponse throughout the speech range.

The microphone manufacture's instructions should be follo­wed in connecting the microphone cable to the plug With

many microphones, the push-to-talk button must be pressed

to make the microphone operative For PTT operation, this
feature may be disabled, if desired, by opening the micro­phone case and permanently connecting the contacts which

control the microphone.

The standard microphone sensitivity is within the range of

-50 dB to -60 dB. If a microphone having a higher sensi-

tivity is used. the AlC circuit will not function properly In
this case. insert an attenuator as shown in the illustration at

right or connect a resistor (10k ~ 33k ohms) in parallel
with the capacitor 100 pF (C94) in the IF unit
(X48-1150-00) of the transceiver.

MIC

TS-820S

MIC Connector

2.6 KEY

If CW operation is desired. connect a key to the KEY jack

2.7 EXTERNAL SPEAKER AND
HEADPHONES

Receive audio output from the TS-820S is 1.5 watt at 4 to 16
ohms. The TS-820S has a built-in speaker. However If an
external speaker is desired for fixed station or mobile opera­tion. simply connect it to the SPEAKER jack on the real pa-

nel. The speaker may be any good 8 ohm permanent ma-

gnet type in the 4 inch or large size The internal speaker IS
disconnected when an external speaker is used.

Headphones should also be 8 ohms impedance. Whel"l.the
headphones are connected to the front panel PHONES Jack

the speaker is disabled.

2.8 RTTY (FSK)

For ATTY operation. connect a teletypewriter to the ATTY

KEY jack on the rear of the transceiver Since this Jack IS

connected to the switching circuit for shifting frequencies. a

relay should be inserted in the closed loop of the teletypew-

riter for keying operation.

2.9 GROUND

So preventing to receive an electric shock. TVI and BCI.

select a good. effective ground for installation and then con­nect an earthing wire to the backside of GND terminal Use

a heavy earth line as big as possible. It is because short line

wiring is regarded as most effective for operation.

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Fig. 2 Microphone Connection Wiring

7

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8

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3.1 FRONT PANEL CONTROLS

CD METER

The meter monitors six different functions. depending on

the position of the METER switch. In receive the meter is

automatically an 5-meter The 5-meter shows received si­gnal strength on a scale of 0 to 40 db over 59 In transmit

the meter function depends on the position of the METER

switch. as described below

~ METER SWITCH

VFO INDICATOR

@

The VFO indicator is a light emitting diode which illuminates

whenever the TS-820S's internal VFO is controlling the trans-

ceiver's operation. The indicator is not lighted during fixed
channel, or remote VFO. operation

RIT INDICATOR

@

This light emitting diode is illuminated when the RIT circuit

is turned on. showing that the transmit and receive frequen­cies may be different

The position of the METER switch determines the function

of the meter The switch selects one of the following func-

tions (see Section 4 for nominal meter readings):

ALC

IP

RF:

caMP:

HV

(Automatic Level Control) -In thIs position the
meter monitors the ALC voltage of the internal
ALC circuit (or the AlC voltage feedback from a

linear amplifier operated in conjunctIon with the

TS-820S). For SSB operation the ALC reading for

voice peaks shquld be within the indicated ALC
range of the meter. The ALC voltage adjustment
is made with the MIC control for SSB and with
the CAR control for CWo

(Plate Current) -In this position the meter moni­tors the plate current of the final tubes. The me­ter scale is calibrated from 0 to 350 ma.

(Output Power) -In this position the meter mo-

nitors the relative output power of the transcei-

ver. There is no meter scale for this Rosition.

Normally the reading should be adjusted with the

RF VOLT control for a 2/3 scale meter reading.

This indicates the state of compression when the
speech processor is operated.

(High Voltage) -In this position the meter moni­tors the high voltage from the power supply. The
meter scale is calibrated from 0 to 10. indicating

0 to 1000 volts.

SUB-DIAL

<1)

The sub-dial is turned with the main tuning knob to select
the operating frequency of the transceiver It is calibrated at

50 kHz intervals from 0 ~ 500 kHz.

@ DIAL SCALE

The unique mono-scale permits direct reading of frequencies

over the range of 0 to 500 kHz graduated at 1 kHz irller-

vats. Operating frequency can be obtained by adding the

frequency read on the dial to the frequency (MHz) indIcated
on the BAND switch.

(ii DIAL CALIBRATE KNOB

This knob is used to calibrate the reading on the dial scale.

It should not be used for turlll\g purposes

@ MAIN TUNIG KNOB

This knob turns the VFO and dial scale to select the fre-

quency to be added to the bslld frequency to establish the

transceiver's operating frequency

@ STAND-BY SWITCH

This two position lever switch selects one of the following

functions

REC:

The transceiver is receiving unless the micro­phone PTT switch is switched to transmit, or the

VOX circuit is activated.

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@ ATT INDICATDR

This indicator uses a light emitting diode. It is illuminated

when the RF A TT switch is turned to ON

FIX (FIXED CHANNEL OPERATION)

@

INDICATOR

The FIX indicator is a lightemltting diode which illuminates

whenever the TS-820S's internal fixed frequency oscillator is
controlling the transceiver's operation

10

SEND

The TS-820S is locked into the transmit mode in
this switch position.

@ VOX SWITCH

This two-position lever switch selects one of the following
functions.

MAN

With the switch in this position. the transceiver is
switched into transmit or receive by the stand-by
switch or the PTT switch on the microphone.

TUN

Used for adjustment of transmit conditions. The

input power to the final stage is low as compared

with that for CW so that the final stage tubes can

be protected against damage due to overloading

during adjustment. Since the KEY circuit is ino­perative in the TUN mode, the transceiver cannot
be used for transmission or reception.

vox

@

With the switch in this position. the VOX circuit is
turned on for voice operated transmit on. SSB se­mi-automatic break-in operation on CWo

NB SWITCH

off. The noise blanker is designed to reduce pulsating igni­tion type noises. When the lever switch is flipped up. the
circuit is turned on.

@ MONI (MONITOR) SWITCH

This switch is used to demodulate part of the output of the

transmit IF amplifier for monitoring transmit signals.

@ AGC SWITCH

The AGC switch controls the AGC (Automatic Gain Control)

circuit giving the operator three choices:

OFF: It may be desirable to turn the AGC off when re-

ceiving a very weak signal.

FAST:

The FAST AGC position is designed for use in CW

operation.

SLOW:

Use the SLOW AGC position for SSB operation

@ PHONES JACK

CW:

use

Used for CW operation

Used for USB operation It is internationally de.
termined that the 14. 21 and 28 MHz bands be.
long to USB.

LSBThe NB switch turns the built-in noise blanker circuit on and

Used for LSB operation. It is internationally de­termined that the 3.5 and 7 MHz bands belong to
LSB.

For RTTY operation with teletypewriter.

@) COMP lEVEL KNOB

Pull this knob during sse operation. The speech processor
is activated and the talk-power is increased. Adjust the
state of compression by turning the knob while observing
the COMP meter.

@ DELAY KNOB

The DELAY control adjusts the holding time of the VOX cir-

cuit for VOX or break-in CW operation. The control will have

to be adjusted to the preference of the individual operator.

@ ANTI VOX KNOB

This control adjusts the level of the anti VOX signal fed in to
the VOX circuit. Adjust the control to prevent feedback of
the speaker from tripping the VOX circuit.

The headphones jack allows use of a 4 to 16 ohm set of
headphones with a 1/4" phone plug attached. When the
phones are plugged into the transceiver. the speaker is dis­connected.

@ MIC CONNECTOR
The microphone connector is four pronged. allowing use of

the PTT microphone. Figure 2 shows how to wire the plug
on the microphone cable.

@ MODE SWITCH

The MODE switch is used for selection of type of waves or
for TUNE operation.

@ VOX GAIN KNOB

This control adjusts the sensitivity of the VOX circuit by ad-

justing the gain of the VOX amplifier. for voice controlled
operation.

@ RF ATT SWITCH

With this switch set to ON. ATT (attenuator) of about 20 dB
is connected to the antenna circuit. protecting the RF ampli­fier and mixer circuit from strong input signals.

@ RIT SWITCH

This is the switch for the AfT (receiver incremental tuning)

circuit To turn on the circuit, press this switch; to turn off,
press it once again. The AIT indicator is illuminated when

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the RIT circuit is ON By turning the RIT knob. the receive
frequency of VFO can be changed by :t3 kHz and the fre-

quency of fixed channel by :t 150 Hz without changing the
transmit frequency.

@ BAND SWITCH

This 11-position switch selects all the necessary circuits to
tune the transceiver to the desired 500 kHz band.

fixed channel crystals are installed in the transcei.

verI.

@ H. SW (HEATER) SWITCH

This switch turns the heater circuits of the three transmitting
tubes on and off. The heaters would normally be turned to
OFF to reduce power consumption in mobile or portable re-

ceiving.

@ FUNCTION SWITCH, ,

This 7 -position rotary switch selects one of the following

transceive functions.

GAL

FIX:

CAL.

RMT

CAL­25 kHz:

This position allows calibration of the 1"5-8205'5

internal VFO to one of the transceiver's fixed fre-

quency channels (if an optional fixed channel cry­stal is installed), With the switch in this position a
signal is generated at the selected fixed channel

frequency and the main tuning knob can be tuned

to zero beat the calibrating signal,

This position alloWs calibration of the VFO-820

(remote VFO) to the transceiver's operating fre-

quency. With the switch in this position. the

transceiver generates a calibrating signal and the
VFO-820 can be tuned to zero-beat the calibra-

ting signal.

With the switch in this position. the transceiver's
calibrator circuit generates a marker signal at

every 25 kHz for normal calibration of the internal

VFO.

VFO:

The switch is kept in this position for normal

transceive operation.

~~ POWER SWITCH

The POWER switch turns all the power on and off in

TS-8205.

@ RIT KNOB

This knob is used to change receive frequency when the AIT

circuit is in operation Set the center position (0) of the
AIT knob to the AIT -OFF.

@ IF SHIFT KNOB

By using this knob during reception. the center frequency of

the IF crystal filter can be shifted by :t 17 kHz. facilitating
the adjustment of the tonal quality of receive signal or elimi-

nating radio interference from nearby frequencies. For nor­mal operation. this knob should be set to the center position

(click is heard).

(:j~ MIC GAIN KNOB

This knob is used for adjustment of the gain of MIC amplifier

during sse operation. Adjust so that the meter pointer does

not deflect beyond the ALC lone.

@ CAR (CARRIER) LEVEL KNOB

Used to adjust carrier level during CW operation. Adjust so

that the meter does not deflect beyond the ALC lond.

VFO.R

FIXR:

FIX:

12

With the switch in this position. the TS.820S's in­ternal VFO controls the receive function and the

internal fixed channel oscillator controls the trans-

mit function (if fixed channel crystals are installed

in the oscillator).

With the switch in this position, the TS-820S's in­ternal VFO controls the transmit function and the
built-in fixed channel oscillator controls the re­ceive function (if fixed channel crystals are instal­led in the oscillator) The VFO.R and FIX.R allow
cross-channel operation without an external VFO.

With the switch in this position. the IS-820S's
fixed channel oscillator controls the transmit and

receive function of the transceiver (if accessory

@ AF GAIN KNOB

This knob adjusts the gain of the receiving audio amplifier

The audio volume of the received signal increases as the

control is turned clockwise.

@ RF GAIN KNOB

This control adjusts the gain of the receiver sections RF am-

plifier. Turn the knob fully clockwise for maximum gain and
for a correct S-meter reading Turn the control counter--

clockwise to reduce the gain.

@ FIX CH (FIXED CHANNEL) SELECT SWITCH

This four-position rotary switch selects between four diffe-

rent fixed frequency channels which can be installed Inside

-

the transceiver. Fixed frequency operation is convenient for
operation on often used frequencies. The fixed channel os­cillator replaces the VFO when the FUNCTION switch is pla­ced in the FIX position.

@

DRIVE KNOB

The D RIVE tuning control tunes the plate tank circuit of the

12 BY7 A driver as well as receiver's antenna and mixer

coils. In receive the DRIVE control is tuned for maximum

sensitivity (maximum S-meter deflection). In transmit the
DRIVE control is tuned'for a maximum ALC reading. When

the control is correctly tuned for transmission it will be cor-

rectly tuned for reception.

@

PLATE KNOB

The PLATE control adjusts the plate tuning of the two final

amplifier tubes.

@

LOAD KNOB

The LOAD control adjusts the loading of the pi-circuit bet-

ween the final section and the antenna. The control is adjust

as described in Section 4 for impedance matching.

@

DH (DISPLAY HOLD) SWITCH

With this switch set to ON, the frequency below 100 kHz on

the display dial remains on even when the main dial knob is

rotated This feature is useful to memorize the original fre­quency when checking other frequencies. The DH switch

being ON turns off the lights for "MHz" frequencies, elimina-

ting a worry about mis-reading frequencies.

13

3.2 REAR PAN EL CONTROLS

CD RFVOLT

Use the RF VOLT control to adjust the sensitivity of the RF

output function of the meter. Adjust it for a 2/3 scale rea-

ding during CW transmission.

@ COOLING FAN
This fan cools the RF amplifier section of the TS-820S to in-

sure reliable and efficient opera'tion.

@ ANTENNA CONNECTOR

This SO-239 coax connector should be attached to a suita-

ble antenna for transmitting and receiving See Section 2.4
for a discussion of an appropriate antenna.

@ BIAS CONTROL
The BIAS control adjusts the bias voltage of the two

S2001A (6146B) amplifier tubes. Tuning the control clock-

wise increases the idling plate current of the tubes. Section

4 describes adjustment of ~he bias current.

@ SG SWITCH

The 5G slide switch controls the screen grid voltage o.n the

final tubes. For tuning or neutralizing the TS-8205 you can

set the switch to the OFF position Turn the switch back to

the ON position for normal operation The 5G voltage is on

when the switch is up and off when the switch is down.

@ TRANSVERTER IN JACK

This is the RF input jack for input from a VHF transverter.

(j) TRANSVERTER OUT JACK

This is the low level RF output jack for use with a VHF trans.

verter

@ GND (GROUND) LUG
To prevent accidental shocks from the chassis. as well as in-

terference. connect a good earth ground to this lug.

When the position of the AC Voltage Selector Switch is

changed. it is also necessary to change the power fuse for

120 volt operation a 6 ampere fuse, for 220 volt operation a

4 ampere fuse provided with the TS-820S should be used.

@ AC VOLTAGE SELECT SWITCH

This slide switch switches the primary of the power transfor

mer to select 120 or 220 VAC operation.

POWER SUPPLY CONNECTOR

C!~

This 12-pin connector is used to connect an AC or DC power

source to the transceiver.

TRANSVERTER CONNECTOR

~2)

This 12 -pin connector is used to control an accessory VH F
transverter.

@ X VERTER SWITCH

When VHF Transverter (TV-502S) is connected to the trans
ceiver, the selection of H F or VH F IS automatically accom
plished by setting the transverter switch to ON or OFF.

@ PHONE PATCH IN JACK
This is a phone patch input terminal for transmission of

SSTV or other line inputs.

\1~ PHONE PATCH OUT JACK
This is a line output terminal for phone patch or recording. It

is also used for connection to the input of FSK demodulator

SSTV.

(~

@ FUSE

This fuse is a JAG. 4 amp fuse which protects the power

supply of the transmitter against short circuits. Never use a
higher amperage fuse than the one specified. An improper

one can cause extensive damage to the transmitter. When
the fuse blows out. try to determine the cause before repla-

cing it.

14

SPEAKER JACK

The receiver audio output can be connected through this
jack to the external 4 to 16 ohm speaker. The internal

speaker is disconnected when an external speaker is con­nected

~

@ EXTERNAL VFO CONNECTOR
This 9-pin connector provides a means of interconnecting

the KENWOOD VFO-820. another external VFO. or an ex­ternal receiver. The interconnecting cable is provided with
the VFO-820. The 9-pin jumpered VFO plug provided with
the TS-820S must be inserted in this socket for normal

transceiver operation.

@ REMOTE CONNECTOR

The REMOTE connector is an 8-pin socket for use in inter-

connecting a linear amplifier. an external speaker. or another

accessory item. (See Fig. 30)

@) IF OUT JACK

Receive signals from the final I F stage are supplied to this

jack for monitoring waveforms of opposite stations.

Frequency 8.83 MHz
Output Approx. 0.67 Vrms. (ANT input more than

3JlV. load resistance 4.7 kO)

@ CW KEY JACK

Connect a key to this 1/4" phone jack for CW operation

Key opened terminal voltage approx. -65V.

@ RTTY KEY JACK
This is used for FSK operation. A 2P plug should be inserted

for connection to the switching circuit of a teletypewriter.

@ DC-DC CONVERTER CONNECTING HOLE

DC-DC Converter (DS-1 A. option) can be wired through this

hole. For wiring. remove the cover plate.

15

i SECTION 4. OPERATING INSTRUCTIONS ,

'_Nt .ouo... 0 nil 0., HI". ouu 0 nuo.o IIU'. ..HI'. 01t'0 o. 0 no.. 0_. oHllO ..u 0 p. oUU o. ouu o. "UI'. ouop O U' ._."""._.0 o ,_Nt. u

4.1 PRELIMINARY PROCEDURE

Set the MIC and CAR controls to zero and the MODE switch
to LSB. USB. or CW to prevent accidental transmit con­ditions before tuning. The TS-820S must be operated into a

50 ~ 75 ohm antenna or dummy load with an SWR less

than 2 : 1. Random length wire antennas or light-bulb dum-

my loads cannot be used, Conventional half-wave dipoles

and beam antennas should only be used at or near their

resonant frequency. Exceeding an SWR of 2: 1 can

damage the components in the output stage of the

transceiver,

Be sure to complete all of the required cabling. as described
in Section 2.3 " 2.8.

With a suitable antenna and microphone (or key) connected

to the transceiver. set the T5-8205 switches to positions des-

cribed in Table 1

4.2 RECEIVER TUNING

Refer to Table 1 for the initial switch settings of the T5-8205

for receiving. and then continue with the described proce­dure.

Push the POWER switch on. The meter. dial scale. and VFO
indicator will light. indicating that the transceiver is opera­ting The receiver section is fully solid-state allowing recep-

tion with the H SW switch turned to OFF Advance the AF
GAIN control clockwise until some receiver noise is heard in
the speaker Turn the main tuning dial within the frequency
range of the amateur band chosen until a signal is heard
Tune the signal for the clearest possible reception. and then

adjust the DRIVE control for maximum deflection of the S--

meter.

The RF GAIN control varies the AGC feedback voltage which

effects the S-meter reading. With the RF GAIN control fully

clockwise. the S-meter gives a proper signal strength rea-

ding Tuning the control counter-clockwise reduces the RF

GAIN. reducing signal strength and band noise

4.3 READING THE OPERATING

FREQUENCY

The frequency dial of T5-8205 indicates accurate carrier
positions regardless of operating modes because of the use

of a special circuit system. thus the transmit and receive fre­quency can be directly read on the dial. except for CW recep.
tion in which case the frequency on the dial is lower by the
beat frequency than the receive frequency
When the digital display is used.

If there is any difference between the frequencies on the dial

TABLE 1. Initial Switch Settings for Receiving

CONTROL LOCATION

FRONT PANEL CONTROLS

REAR PANEL CONTROLS

-

CONTROL

BAN D Switch
POWER Switch
H. SW Switch
Stand-by Switch
N B Switch

RIT Switch
RF ATT
FUNCTION Switch
AGC Switch
MODE Switch

PLATE Knob

DRIVE Knob

RIT Knob

AF GAIN Knob

IF SHIFT Knob

RF GAIN Knob

EXT VFO Connector

SG Switch

X VERTER Switch

The remaining controls do not affect reception so they may
be in any position.

-

Desired band

POSITION

OFF
OFF

REC

OFF
OFF
OFF
VFO

SLOW or FAST

To the appropriate sideband or CW

Middle of the range for the band

Centered

Centered

Fully counter-clockwise

Centered

Fully clockwise

The jumpered plug must be in this socket
ON (up position)

OFF

~

16

scale and the digital display. the correct frequency is on the
digital display In this case. the analog dial should be ca­librated with the calibrate knob.

NOTE: When the digital display is used, the digits for

10 MHz order change according to the BAND switch and
are independent of the counter unit. In the 295 MHz band,
for example, the indication "29.9999" is followed by

,. 200000"

cw

Set the IF SHIFT knob to its center position. If CW filter is

not used, obtain a zero beat point of marker signal and turn

the main tuning knob counter-clockwise until a beat signal

of about 800 Hz is received. While holding the main tuning
knob, turn the dial calibrate knob so that the dial pointer in-

dicates the correct position on the dial.

When CW filter is used. turn the dial when the marker signal
casues maximum deflection on the S meter and then cali­brate using the dial pointer. In this case. the beat frequency
is about 800 Hz (CW filter YG-88C is optional extra)

CALIBRATING THE FIXED CHANNEL AND
VFO FREQUENCIES

Fixed channel and VFO frequencies can be calibrated at the

CAL-FIX position of the FUNCTION switch. Set the switch
to the CAL-FIX position and turn the VFO main tuning knob

until a beat signal is received in the vicinity of fixed channel
frequency. Calibration is effected at the zero beat position

CALIBRATING THE TS-820S WITH VFO-820

Turn the FUNCTION switch to CAL-RMT to cal!brate the
T5-8205 with the VFO-820. a receiver. or another remote

VFO Tune the remote VFO to the frequency selected on the
T5-8205 and zero beat the generated marker signal. At zero
beat. the T5-8205 and remote VFO frequencies coincide.

4.4 CALIBRATING THE FREQUENCIES

To read frequencies correctly from the dial scale. the dial

must be calibrated previously using a 25 kHz marker. To ca-

librate. set the FUNCTION switch to CAL-25 kHz and the

AIT switch to OFF. Turning the AF ATT switch to ON redu­ces the incoming signal and the marker signal can be recei­ved more easily Detailed method of calibration is described
below.

sse

Set the MODE switch to use or LSe Marker signals are re­ceived at every 25 kHz so accurate calibration is possible
over the entire range of the dial.

With the transceiver set to your desired band, turn the main

tuning knob so that a beat signal can be received at every
25 kHz. Turning this knob further will cause the beat signal
to vary from high to low tone and finally become a zero

beat Accurate zero beat point is obtained by turning the IF

SHIFT knob in the "-" direction (for USe), and in the "+"
direction (for LSB). Stop turning the knob at the zero beat

point and rotate the dial calibrate knob alone while holding
the main tuning knob until the dial pointer indicates 0, 25,
50 or 75 on the dial.

The dial calibrate knob is forced against the main tuning

knob by means of a spring permit slip ro!ation with ease.

By calibrating the TS-820S for normal operation. as

described previously. the TS-820S can be used as a

frequency standard for calibrating the remote VFO.

4.5 RF GAIN

RF GAIN is controlled by changing the voltage of the AGC
circuit Adjust the RF GAIN knob so that the S meter does

not cause excessive deflection This minimizes the noise du­ring reception and allows the S meter to indicate the correct
signal strength. For normal operation. this knob should be
turned fully clockwise for maximum sensitivity

4.6 RF ATT

If the transceiver is operated in a short-distance (within
several hundred meters) and strong signals of nearby fre­quencies are received. the wanted signals are blocked. Also.

if the wanted signals are very strong. the S meter is scaled

out In this instance. set the ATT switch to ON. The input
signals to the RF amplifier are attenuated by about 20 dB.
providing distortionless reception

4.7 RIT

By using the RIT knob, the receive frequency of VFO can be
shifted by about :t3 kHz and the frequency of fixed channel

by about :t 150 Hz without changing the transmit fre-

quency If the frequency of the opposite station is deviated.

your receive frequency can be set to the station by turning

the AIT switch to ON and using the AIT knob. The state of

17

AIT can be checked bh the indicator in the window of the

dial

4.8 IF SHIFT

By using the IF SHIFT knob during reception. the pass band
frequency of the crystal filter can be shifted by about

i 17kHz because of adoption of PLL (Phase Locked Loop)
circuit in the local oscillator circuit This is one of the major
features of TS-B20S and can be used in the following cases:

switch to SEND and check that the plate current (IP) is 60
ma. If the plate CUI rent is not correct. adjust the real !Janel
BIAS control for a correct 60 ma of idling current and return
the stand-by switch to REC.

CAUTION: If the plate current is very much higher than 60

ma do /lOt leave the stand-by switch on for more than a few

seconds Excessive plate current shortens the life of the fi-

nal tubes.

Adjustment of Tonal Quality and Interference Rejection
during SSB Reception.

When the transceiver is used in USB mode. turn the IF
SH I FT knob in the ..+.. direction and the lower frequen-

cies are cut out Turning the knob in the ..-" direction
cuts out the higher frequencies (these procedures are

reversed for LSB mode) Adjust the knob so that the to-

;.

-nal quality suits your listening preference The IF SHIFT
knob is also effective in eliminating interference when

the receive signals are superposed on nearby signals

Adjustment of Tonal Quality during CW Operation

2

For detailed descriptions, refer to Section 413 "CW
operation",

FSK (ATTY) Operation at 850 Hz Shift

3

For detailed descriptions, refer to Section 419 "ATTY

operation",

4.9 NOISE BLANKER

The T5-8205 has a sophisticated built-in noise blanker

designed to reduce ingition type impulse noise The noise
blanker IS particularly important for mobile operation. When

necessary. activate the noise blanker circuit by flipping the
NB switch up.

4.10 AGC (AUTOMATIC GAIN CONTROL)

Set the AGC switch to the position appropriate for the

received signal Generally for SSB reception set the AGC

switch to SLOW. for CW reception set the AGC switch to

FAST. and for reception of a very weak signal the switch

may be set to OFF

4.11 TRANSMITTER TUNING

Connect the T5-8205 to a 50 ohm du mmy load or a 50 ohm
antenna with an 5WR of less than 2 1 before making any

transmitter adjustments. The life of the final tubes is directly
related to the 5WR of the antenna and to the length of tu-

ning periods

Refer to Table 2 for the initial switch settings of the TS-820S
for transmitting Tune the main tuning knob to the desired

operating frequency

PLATE IDLING CURRENT (See Fig. 7)

Turn the main tuning knob to the desired operating fre-

quency within the amateuf band selected Flip the stand-by

DRIVE TUNING (See Fig 8)

Shift the METER switch to ALC and the MODE switch to

TUN and peak the ALC reading (maximum meter deflection)

with the DRIVE control The stand-by switch is in the SEND
position for adjustment.

NOTE: If there is no ALC reading indicated. increase the

CAR control until there is an ALC reading

PLATE TUNING (See Fig 8)
Turn the METER switch back to IP, leave the MODE switch

at TUN and flip the stand-by switch to SEND Quickly adjust
the PLATE control to dip the plate current (a minimum meter

reading) Return the stand-by switch to REC

NOTE: The TUNE position permits tuning of the finaltilok
circuit at reduced power without danger to the tubes With
the MODE switch io the TUN position, the screen voltage of
the finals is reduced to approximately 50% and the keying

circuit is shorted.

PLATE AND LOAD TUNING

CAUTION: When the MODE switch is in the CW position
the final tubes draw full plate current in transmit Final tube
life is directly related to the length of tune-up periods Do

not transmit with the tubes out of resonance for more than
10 seconds at a time

Turn the MODE switch to CW. turn the METER switch to RF.

and set the stand-by switch to the SEND position. Quickly

adjust the PLATE control and then the LOAD control alter-

nately to peak (maximum meter lit/flection) the power out.

put. If necessary. adjust the RF VOLT control on the rear pa-

nel to bring the output reading to about a 2/3 scale rrladlng.

NOTE 1: The ALC meter is less deflected at the ON posi­tIon of the SG switch or at the CW poSition of the MODE
switch than at the OFF position or the TUN position of these
switches This indicates the normal state of RF NFB The
MIC knob and the CAR knob should be properly adjusted un

der normal transmit condItions.

NOTE 2: Transmission is not effet;ted at the WWV or AUX

position of the BAND switch If the transceiver is left in the

transmit mode over a few minutes, the driver tube 12 BY7 A
of the final stage may be dalnaged,

18

~

Table 2. Initial Switch Settings for Transmission

(The controls not described should be set as described in Table 1)

LOCATION

FRONT PANEL CONTROLS

REAR PANEL CONTROLS

CONTROL

BAN D Switch
POWER Switch
H. SW Switch
Stand-by Switch
MODE Switch
VOX Switch
MONI Switch
MIC Control
CAR Control
METER Switch
PLATE Control
DRIVE Control
FUNCTION Switch

RIT Switch
SG Switch
EXT VFO Connector

TABLE 3. Summery of Transmitter Tuning Procedures

POSITION

Desired band
ON
ON

REC

USB or LSB depending on selected band

MAN

OFF

Fully counter-clockwise ;'
Centered

Ip

Middle of the range for the band
Centered
VFO
OFF
UP (ON)

Jumpered plug inserted .

19

4.12 SSB OPERATION

Tune the TS-a20S as described in Sections 41 to 4.11. Set
the MOOE switch to USB or LSB and connect a microphone

to the MIC connector

NOTE: International amateur practice dictates using use

or LSB on the following bands

Key the transmitter and speak Into the microphone with the
tone of voice used in normal operation. Adjust the MIC con­trol until voice peaks are just within the top limit of the ALC
range printed on the meter scale. The METER switch is in

the ALC position If the transmitter section is driven beyond
this range. the transmitted signal will be distorted.

PTT OPERATION

By connecting the microphone equipped with PTT switch.
the transceiver is readily used for PTT operation. For com­munication. depress PTT switch with 5T ANDBY switch left

in the R EC position.

CW transmissions are automatically monitored through the

speaker of the transceiver. The audio gain of the sidetone

can be adjusted with VR3 on the AF board.

For semi-break-in operation. turn the VOX switch on Hold
the key down and increase the VOX GAIN control. until the

VOX relay just operates. It is desired to change the release

time constant of the VOX circuit. adjust the DELAY control

The plate current for CW operation should be about 200

ma. Use the CAR control to adjust the carrier level for CW
operation. At 200 ma of IP there may be 00 ALC readIng

OPERATION WITHOUT CW FILTER

Set the IF SHIFT knob to its center position and the AIT

switch to the OFF position to receive CW signal, Turn the

main tuning knob for about 800 Hz of beat signal and your

transmit frequency will be set to the transmit freqllency of
the opposite station (zeroing) During reception, the side
tone monitor is activated by pressing down the key In this
case. listen to the side tone signal and the receive signal and

adjust the main tuning knob so that the cycle of the sound is
increased, By so doing. the zeroirlg of frequencies can be
achieved After zeroing. set the Ril switch to ON and turn
the RIT knob for the pitch that suits your listening taste

When interference is encountered. turn the IF SHIFT knob

and the interference can be eliminated For more effective

CW operation. use the CW filter VG-88C (option) bV refer­ring to page 34,

VOX OPERATION

Adjust the transceiver as des(;ribed in the previous para­graph. Flip the VOX switch on and close-talk Into the micro­phone. increasing the VOX GAIN control until the VOX relay

just operates. For VOX operation it is desirable to close-talk
the microphone to prevent background noises from tripping
the TS-820S into transmission.

Check that the ALC reading for voice peaks is still within the
ALC range on the meter. If necessary. adjust the MIC con-

trol for a proper ALC reading

If the VOX circuit is activ~ted by speaker noise. adjust the

ANTI-VOX control. Increase the control as necessary for

proper VOX operation.

Do not use more VOX GAIN or more ANTI VOX gain than
necessary to control VOX operation If the VOX circuit
transfers between words. or holds too long. adjust the re­lease time constant by turning the DELAY control.

4.13 CW OPERATION

Tune and load the TS-820S as described in Sections 4.1

through 4.11. Connect a key to the back panel CW KEY

jack. set the MODE switch to CW, and set the stand-by

switch to SEND for transmitting

OPERATION WITH CW FILTER (OPTION)

Set the transceiver in the receive mode by setting the IF

SHIFT knob to the center position and the RIT switch to the

OFF position Adjust the main tuning knob for maximum de-

flection of the S meter. The pitch of the sound of the receive
signal will now be about 800 Hz. indicating that the zeroing

is completed.

Turn the AIT switch to ON and adjust the AIT knob for your

desired pitch of the sound. Also. adjust the IF SHIFT knob
for maximum signal strength.

OPERATION WITH DIGITAL DISPLAY
(TS-820S ONLY)

The digital display indicates the frequency of carrier signal

(BFa signal) so that the frequency indicated is deviated from
the transmit frequency of the opposIte station by the receive

beat frequency during CW reception (with IF SHIFT knob set

to its center position. the frequency indicated becomes lo-

wer)

To zero-in the frequencies with the digital display. set the

AIT switch to ON and turn the AIT kl\ob while manipulating
the standby switch. in order to locate a point at which the

frequency Indicated is not changed regardless of the poSition
of the stand-by switch. With the AIT knob left in that

position. turn the main tuning knob until the signal from the

.

20

opposite station becomes a zero beat signal (zero beat signal

can be easily noted by turning IF SHIFT knob).
This completes the zeroing of the transmit frequency. Turn
the RIT knob for your desired pitch of sound.

TABLE 4. Meter Switch Positions for Different Modes

The crystal frequency is determined by the following formu
las.

Crystal Frequency (MHz) = 55 MHz

quency (MHz)

x -Operating Fre

x = 1.8 for the 160 meter band
X = 3.5 for the 80 meter band

X = 7.0 for the 40 meter band
X = 140 for the 20 meter band
X = 21 0 for the 15 meter band
X = 280 for the 10 meter band or
X = 28.5 for the 10 meter band or
X = 29.0 for the 10 meter band or
X = 29.5 for the 10 meter band

Crystal Specifications: HC-25/U holder. 5.0 to 5.5 MHz os­cillation frequency. and see Figure 9 for type of oscillation

circuit.

Example: Desired Operating Frequency = 7.255 MHz

Crystal Frequency = 55 MHz + 7.0 MHz -

7.255 MHz = 5245 MHz

This same crystal will operate on each band
Operating Frequency = 5.5 MHz + X (in MHz) -

Crystal Frequency (in MHz)Recommended monitoring position during operation,

4.14 OPERATION WITH A LINEAR
AMPLIFIER (See Fig. 30)

Tune and load the TS-820S as described in Sections 4.1
through 4.11 and adjust it for the selected mode.

The REMOTE connector on the back panel is provided for in-

terconnections with an amplifier. See the instruction ma-

nual of the amplifier to determine whether the linear requires
a normally open Iduring receive) or a normally closed (during
receive) relay contact. Connect either pin 3 (normally closed
to ground during receive) or pin 5 (normally open to ground

during receive) of the REMOTE connector to the control jack

on the amplifier.
Connect the ALC feedback from the amplifier to pin 6 of the
REMOTE connector. The output of the TS-820S is quite

adequate to drive most amplifiers to full rated output.

4.15 FIXED FREQUENCY OPERATION

The TS-820S has a built-in crystal controlled oscillator for
fixed frequency operation. This feature is most useful for

commonly used frequencies. nets. or any situation where
crystal controlled operation is required. To use the fixed fre­quency oscillator. turn the FUNCTION switch to the FIX po­sition. Select one of the four available channels with the fi-

xed channel selector switch and tune and load the TS-820S

as described in Sections 4.1 through 4.11. Simply operate

the transceiver as described in Sections 4.12 and 413.

Example: Crystal Frequency = 5.245 MHz
On the 14 MHz band the crystal will oscillate at

Operating Frequency = 55 MHz + 14.0 -

5.245 MHz

= 14255 MHz

21

4.16 INTERNAL CROSS CHANNEL
OPERATION

The TS-820S contains a unique design feature which allows

cross channel operation without a separate external VFO

'The TS-820S's internal VFO is used together with the fixed

frequency oscillaltor to allow reception and transmission on
different frequencies The fixed channel oscillator must have
one or more accessory crystals installed for this feature to

work

4.17 MOBilE OPERATION

The compact size and solid-state design of the TS-820S make

It Ideal for mobile use. by using optional DS-1 A

Be sure to use a mobile antenna IIIIhlCh meets the require­ments described in Section 2

The normal operating procedures described previously. ap-

ply to mobile operation The noise blaker should be used to
reduce ignition and impulse noises for clear reception Re­member that during transmission the transceiver draws

about 15 amps so be careful not to drain the car's battery.

4.18 OX OPERATION (Use of PROCESSOR)

OPERATING PRINCIPLE

The speech processor is inserted between the first and se­cond stages of the microphone amplifier as shown in Fig
(AI. The MIC gain control is used to adjust the 8M. input
level.

MIC AMP 1 ON

D 0 ",,0-

MIC i ?,

Fig. (AI

OPERATING CHARACTERISTIC
The speech processor functions so that the output of the

MIC AMP 2 is maintained constant when the MIC input
level exceeds -65 dB. as shown in Fig. (B). It also func­tions so that the output remains unchanged when the
processor is set to ON and OFF at -40 dB of MIC Input
level.
The CaMP LEVEL knob is used to adjust the compreliSlon
level. It does not adjust the output of the microphuI18

amplifier

MICROPHONE SENSITIVITY

For proper function of the speech processor. the range of
microphone input sensitivity is limited The T8820 is fac-

tory adjusted to operate the processor at the input sensitivity
of MC-50 (see Note below).

If the sensitivity of your microphone is higher (eg. -30 dB)
than MC-50. the output of the MIC AMP 2 is decreased
when the processor is set to ON. See Fig. (B).

In SSB operation (particularly during OX operation), if your

transmit signals are too weak for your party and cannot be
received clearly by your party. the talk-power can be in­creased by using the speech processor.
The speech processor is activated by simply pulling the

COMP LEVEL knob toward you.

ADJUSTMENTS

1 Connect microphone and set the transceiver in transmit

mode (USB or LSB).

2. Set the METER switch to CaMP

3. Speak into the microphone in normal tone of voice.
The meter pointer will deflect according to the strength

of your voice.

4. Adjust the CaMP LEVEL knob so that the meter in­dicates about 20 dB on rhe CaMP scale at peak inputs.

5 Next. set the METER switch to ALC.

6. Speak into the microphone in normal tone of voice.

7 Adjust the MIC (MIC gain) knob until the meter pointer

deflects into the ALC scale

'5
s-

~

0

n.

~

-t

U

~

Fig. (8)

In this case. insert an attenuator as illustrated on page 6 and
adjust the MIC input to the proper level

NOTE: MC-50: Sensitivity to be --55 dB ::\:3 dB at about

5 cm from microphone

22

~

4.19 RTTY OPERATION

For RTTY operation. the use of demodulator and
teletypewriter is essential. The demodulator should be de­signed to operate from audio inputs and equipped with a fil­ter for 2125/2295 Hz (NARROW. 170 Hz shift) or
2125/2975 Hz (WIDE. 850 Hz shift).

To key-in the FSK circuit of TS-820S. insert a relay coil into

the closed loop circuit of teletypewriter and connect the re-

lay contact to the RTTY KEY jack on the rear panel. Fig. 10
shows the relationship between the transmit and receive fre­quencies of TS-820S.
The frequency shift of the FSK circuit is preset at the factory
to NARROW but it can be changed to WIDE by inserting the
connector as shown in Fig. 11 When operating at the

WIDE position, turn theJF SHIFT knob in the ..-" direction

by about 1.2 kHz so that the mark and space signals are well
balanced during reception. If a CW filter (option) is used for

NA RROW operation. change the position of the connector of
the IF unit (refer to "Operation with CWo Filter")
Setting the MODE switch to FSK automatically decreases
the input power of the final stage. permitting a long time of
continuous operation.

4.21 OPERATION WITH A PHONE PATCH

The !S-820S has rear panel jacks to facilitate using the
TS-820S with a phone patch. The PHONE PATCH OUT jack

has an impedance of 4 '""'"' 16 ohms and the PHONE PATCH
IN jack requires a high impedance input. See the instruction

sheet of the phone patch for cabling instructions.

4.22 USE OF MONITOR SWITCH

To monitor the quality of transmit signal during sse
operation. set the MONITOR switch to ON to demodulate

part of transmit IF signal

This feature is useful when checking modulation conditions

or adjusting the RF speech processor.

When monitoring. use a headphone to avoid howling effect.

Note that if the H SW switch is OFF or the DRIVE knob is

incorrectly adjusted. the ALC circuit does not operate

properly. causing the level of transmit IF signal to become

extremely high which results is distortion in the signal being

monitored.

4.20 SSTV (SLOW SCAN TV) OPERATION

SSTV operation can be accomplished by simply connecting
the output of SSTV camera to the PHONE PATCH IN jack
(or MIC connector) and the input of SSTV monitor to the

PHONE PATCH OUT jack (or SPEAKER jack).

When transmitting signals from the SSTV camera. adjust its

output so that the input power of the final stage is less than

100W (less than 125 mA Ip).

~

~)

j: 0

CARRIER UNIT 0

0 ~ll

0

0

.0

..-

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5.1 BL,OCK DIAGRAM

GENERAL

The block diagram of TS-820S is shown on page 24.

The transceiver is composed of the single superheterodyne

receiver and the single conversion type transmitter with a fil­ter type SSB generator. It uses 8,830 kHz IF and its local
oscillator is equipped with a PLL (phase locked loop) circuit
controlled by VFO. Both the receiver and transmitter use
balanced type mixer circuits with dual gate MOS FET's, thus

minimizing spurious durislg transmission and preventing the
effects of strong signals and suprious signals during recep­tion.

Taking full advantage of PLL system, the transceiver offers
IF SHIFT function (electronic system pass,band tuning) and

permit one SSB filter to provide the same effect obtained by
USB and LSB filters, The transceiver also includes a number

of latest accessory circljits such as the RF speech processor,
the digital display circuit, transmit monitor circuit. etc,

TRANSMITTER SECTION

The microphone signal is fed to the IF unit. amplified by the

microphone amplifier and is then fed to the ring modulator

composed of 4 diodes. The DSB output from the modulator
passes through buffer amplifier and the crystal filter. The

sse signal thus obtained is further amplified and fed to the

transmit mixer of the RF unit.

The transmit mixer is a double balanced type mixer with 2
MaS FETs. The local oscillator is VCO type (voltage control­led oscillator) whose output is controlled by the PLL circuit
to minimize spurious during transmission. The sse signal
converted into the wanted transmit frequency is amplified by
the transmit driver tube (12 BY7 A) before being fed to the
two S200 1 A power amplifier tubes of the final stage.
They operate in class AB 1 because of low distortion amplifi-

cation fo sse signal.
The output signal is transmitted through a pi-network to the
antenna.
RF NFB is applied from the output of final stage to the driver
stage to further reduce the cross modulation distortion.

This signal is fed to the IF unit, passes through the noise

blanker circuit and the crystal filter. and is finally amplified

by the 3-stage IF amplifier, so that it is converted into AF

signal by the ring detector.

The AF signal is applied to the AF-AVR unit where it is am­plified to th~ level to drive the speaker. The frequency cha­racteristic of the AF amplifier is automatically changed to

suit CW or SSB operation by means of the MODE switch.

RECEIVER SECTION
The antenna signal passes through the RF ATT switch.

where it is attenuated by about 20 dB as necessary. and is
then amplified by the RF unit.

The amplified signal is fed to the buffer amplifier and mixed

with VCO output in the balanced mixer with 2 MOS FETs to

produce 8.830 kHz IF signal.

25

26

Fig. 12 IF Board

The I F Board is very important for operation of transmitter

I F BOAR D (X48-1150-00)

and the ring detector. in addition to the noise blanker circuit,

AGC amplifier. S meter amplifier. speech processor and mo-

ring modulator. crystal filter. transmit-receive IF amplifier

5.2 BOARD AND UNIT

and receiver. It is composed of the microphone amplifier.

nitor circuit.

Crystal filters are self contained for SSB operation. CW fil­ters (YG-88C) are available as optional accessories. for easy
installation.

RF BOARD (X44-1150-00)

COIL PACK BOARD (X44-1140-00)

Tuning coils for the individual bands and stages, band select
rotary switch and variable capacitor are all arranged ratio­nally in one unit. These parts function together with the RF
Board.

The RF Board holds the ALC amplifier circuit and the block

bias circuit as well as the RF amplifier and mixer circuit for
transmission and reception.

It also includes a coil pack unit for the tuning circuit.

VFO UNIT (X40-1110-00)

The PLL circuit is controlled by VFO signals. thus the fre-

quency stability ofTS-820S is virtually determined by the sta-

bility of VFO. The unit is composed of 2 FETs. 2 transistors

and 3 diodes. Its oscillation frequency is set to 5.0 -

5.5 MHz.

Fig. 14 Coil Pack Board

Fig. 15 VFO Unit

27

standard oscillator to produce a voltage to control VCO (vol-

tage controlled oscillator). It also forms a full electronic IF

shift loop using an external carrier signal. The VCO unit is
composed of FET type oscillators for each band, buffer am­plifier circuit, and the oscillator shut off circuit at the time of
fault of the PLL circuit. The oscillator frequency is controlled
by the control voltage from the PD Board. The bands of

both units can be selected by means of the diode switches.

Counter Ass'y Unit

COUNTER ASS'Y UNIT (X60-1020-00)
(TS-a20S TYPE ONLY)

This unit is composed of the counter mixer board that
produces operating frequencies by mixing the VCO output

(local oscillator signal for the mixer) with carrier signal. and
the counter board that counts the frequencies in digits
These units are housed in a rigid shielding case Since the
frequencies are read by synthesizing all the local oscillator
signals. accurate operating frequencies are always counted
under any operating conditions. The counter output is pick­ed up as a signal to drive the indicating tubes and is fed to
the display unit.

Fig. 17 Counter Ass'y Unit

29

DISPLAY UNIT (X54-1310-00) (TS-a20S TYPE ONLY)

This unit uses a 6 digit fluorescent indicator to indicate ope­rating frequencies counted by the counter unit. All the digits

glow green to provide many hours of fatigue less operation.

CAR ASSV UNIT (X60-1000-00)

This is a crystal oscillator that functions as a carrier for the

generator during transmission and as a BFO for ring detec­tion during reception The output is partly applied to the PLL

Unit and the COUNTER UNIT

~...

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30

~

AF-AVR BOARD (X49-1080-00)

This Board represents the final stage of the receiver circuit.

holding an AF amplifier and a 9V power stabilizer. The fre­quency characteristic of the AF amplifier can be varied for
CW and SSB operation.

FIX-VOX BOARD (X50-1350-001

This Board incorporates the fixed channel oscillator. the VOX

(voice control) circuit controls voice operated transmission.
the side tone oscillator to monitor CW signals and the vol­tage generator circuit for the clock bias circuit (- 6V).

Fig. 20 AF-AVR Board

'IX-VOX UNIT (X50-1350-001

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31

FINAL BOARD (X56-1200-001VOX-VR BOARD (X54-1190-00)

Three variable resistors. VOX GAIN. ANTI VOX and DELAY,
are directly mounted on a printed circuit board.

5V AVR BOARD (OPTION) (X43-1220-00)

This is a 5V power stabilizer used for the counter unit. It
uses IC to provide rated voltage without making any adjust­ments.

MARKER BOARD (X62-0005--01)

The MARKER board holds the 100 kHz crystal oscillator

(Q 1) and a 25 kHz multivibrator (Q2 and Q3) to produce
marker signals at 25 kHz intervals to calibrate the TS-820.
Q4 amplifies the calibrator signal

RECTIFIER BOARD (X43-1090-02)

This board holds all of the diode rectifiers for the power sup-

ply section of the transceiver. D 1 through D4 rectify the

high voltage. D5 rectifies the 300 volt supply. D6 rectifies
the 210 volt supply. D7 rectifies the 90 volt supply. and D8

through D 11 rectify the 138 VDC supply.

HV (HIGH VOLTA

BOARD

(X43-1110-001

This voltage divider

signal for the HV
screen source used

circuit supplies a himeter

readmg and

in the TUN mode

gh voltage metering

also a low voltage

of operation

This unit includes all the circuits of the power amplifier of

the final stage with the exception of the pi-network circuit at
the output side.

Fig. 22 FINAL Board

5.3 FINAL STAGE POWER AMPLIFIER

This amplifier delivers 200W PEP input by 2 transmit power
tubes (S2001A). It is equipped with a cooling fan to avoid
temperature rise during operation

INDICATOR BOARD (X54-11BO-OOI

This circuit controls the light emitting diodes which indicate

when the AIT circuit is on. when the fixed frequency oscilla-

tor is operating. or when the VFO is oscillating.

RELAY BOARD (X43.1190.00)

This unit holds the stand-by relay. a 5V power stabilizer to
feed power to the PLL circuit. and smoothing capacitors to

obtain low voltage DC power.

The relay of this unit is used to select DC signal for con-

trolling block bias. cross channel operation. etc.

32

~

GEl

6.1 GENERAL INFORMATION

The TS-820S has been factory sligned and tested to
specifications before delivery to the customer. Under nor-

mal circumstances the transceiver will be properly adjusted
to operate in accordance with these operating instructions
In fact. the equipment owner can void the transceivers war-

ranty by attempting service or alignment without permission

from the factory.

When operated properly, the transceiver can give years of
service without requiring realignment. The information in
this section. some general service procedures which can be
accomplished without sophisticated test equipment.

REMOVING THE CABINET (See Fig. 23)
Figure 21 shows how to remove the TS-820S's cabinet. Re-

move the eight top cover screws and the nine bottom cover
screws and lift away the panels. The speaker leads will still
be attached to the chassis so be careful when removing the
top cover. The leads can be unplugged. if necessary.

SERVICE POSITION (See Fig. 24)

The TS-820S should be placed on its side. with the final sec-

tion up. for any alignment or service. This position permits

adequate ventilation for the final tubes as well as easy ac-

cessibility to the modules. Most of the described adjust-

ments can be made without removing the boards from the
transceiver.

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Fig. 23 Removing the Cabinet

J:

@@

Fig. 24 Service Position

p

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33

6.2 ACCESSORIES

CAUTION: BE SURE THE TRANSCEIVER IS
UNPLUGGED AND TURNED OFF BEFORE REMOVING

THE CASE

INSTALLING THE CW FilTER (VG-88C)

(See Figure 251

Install the filter unit according to the following procedures:

1 Remove the top cover of the transceiver using a screw-

driver. Care should be useQ not to break the leads con­nected between the 2 P connector and the speaker on
the cover. Next. remove the 2P connector

2. Turn the transceiver upside-down and remove the bot­tom cover

3 Insert the filter in place at the IF unit circuit board on the

left wall of the transceiver Solder the 4 pins from the
rear side using a small size soldering iron. Soldering
should be finished as quick as possible.

4 Change the position of the connector (IF2) located at

the lower section of the IF unit depending on whether
the FSK shift width is 170 Hz or 850 Hz

Only SS B filter used... ,... A

SSB and CW filters used:

FSK shift 170 Hz (CW filter used) B
FSK shift 850 Hz (SSB filter used) C

NOTE:

1) If you are not interested in FSK operation, plug in
the connector either to the "B" position or the "C"

position.

2) To facilitage the installation of filter and setting of
connector, remove the 3 screws holding the IF unit

fixture to the chassis and then pull the unit upward

Reconnect the 2P speaker connector in position, then

5

replace the bottom cover and the top cover The instal­lation of the filter is now completed

INSTALLING THE DC-DC CONVERTER (DS-1A)

1 Remove the patch plate located on the rear panel of

TS-820S

2. Secure the DC-DC unit to the rear panel using the four
tapping screws supplied with the unit.

3 Select the correct color coded lead from the DC-DC unit

making sure that the color code corresponds to that of
the lead connected to the DC-DC terminal board adja­cent to the power transformer
Solder the lead onto the terminal board.

34

Fig. 25 Installing the CW Filter

Fig. 26 Installing the DC-DC Converter

MOUNTING THE DIGITAL DISPLAY IDG-1A)
ITS-820 TYPE ONLY)

(See Fig. 27)

DG-1 is provided with the following 3 units:

Display Unit
5V AVA Unit

Counter Ass'y Unit

1 Mount the above 3 units in place in the set using screws

(Fig 27(a))

2 Insert the connector 'and the wiring is completed.
3 Calibrate the standard frequency of the counter ass'y

unit by WWV (refer to paragraph 6.3).
For detailed method of mounting, refer to the instruc­tion manual of DG-1 A.

r

Fig. 27 (d)

35

TRANSVERTER (TV.502S)
To connect the transverter to TS-820S. proceed as follows:

1 Check that the power to the transverter and TS-820S is

OFF.

2 Connect the cable supplied with the transverter to the X

VERTER connector of TS-820S and the CONTROL con-

nector of the transverter (2m CONTROL connector for

TV-502S).

3 Connect the supplied pin-cords to the X VERTER OUT

jack ofTS-820S and the TX IN jack of the transverter (2 m

TX IN jack for TV.502S). '

4. Connect the supplied earth cable between the GND ter­minals of TS-820S and the Transverter. This connection
is necesarry because it prevents electrical shocks and

provides stabilized operation

5 Turn on the transverter switch on the rear panel of

TS-820S. The SG switch may be left in the ON position.

Changeover between HF and VHF is automatically ac­complished by the POWER switch of the transverter.

Be sure to turn off the transverter switch when the

transverter is not connected. TS-820S requires no modi­fication for transverter operation

6 Connect the antenna to the ANT terminal on the rear of

the transverter (144 MHz for TV-502S)

7 Check to see that the POWER switch and the standby

switch of TS-820S are set to OFF and REC respectively.

Also. check that the POWER switch of the transverter is

set to OFF. Then connect the power cords to AC outlet
(or DC power source for DC operation).

CONNECTION OF VFO-820 (See Fig 29)

Connect VFO-820 as shown in Fig 29 This connection ma­kes your transceiver operation more enjoyable. After con­nection. keep the 9-P MT plug removed from the EXT VFO

connector of TS-820S in a proper place so that it is not lose

Connecting cord is supplied with VFO-820

By manipulating the function switch of VFO-820, you can

operate as if you are using 2 sets of transmitters and

receivers. To calibrate the VFO frequency of TS-820S and

that of VFO-820. proceed as follows:

1 Set TS-820S In the receive mode and then set the

FUNCTION switch to CAL-AMT position.

2. The FUNCTION switch of VFO-820 may be set in any
position

3 Tune the frequencies of TS-820S and VFO-820 so that a

beat is generated When they are tuned for zero beat,

the frequencies of both units are perfectly calibrated

For operation of VFO-820, refer to the instruction ma-

nual of VFO-820

--

36

Fig. 29 Connection of Accessory Remote VFO

REMOTE CONNECTIONS
Fig. 30 shows the REMOTE connector. This 8-pin plug

can be used for attaching linear amplifiers. or other external

accessories to the transceiver.

EXTENSION FEET

The TS-820S is provided with two extra feet which can be

used to raise the front panel of the transceiver. In some

operating positions the tilt makes it easier to read the dial

and meter. Fig. 31 shows how to install the feet.

r-

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Fig. 31. Attaching the Extension Feet

To an external speaker

Fig. 30 Remote Connector

FIXED CHANNEL CRYSTAL INSTALLATION

Section 4.1 5 describes fixed channel operation with the TS-

8205. To install the accessory crystals, reemove the
transceivers bottom cover and locate the FIX-VOX board

side the power transformer.

Insert the crystal in the desired channel position (the posi­tions are labeled on bottom of the case) and use the appro­priate trimmer (TC1 through TC4) to net the crystal. The

CAL-FIX feature of the TS-820S can be used to net the

crystals as described in Section 4.4.

37

6.3 ADJUSTMENT OF RECEIVER SECTION

ADJUSTMENT OF 9V AVA VOLTAGE (AF-AVA UNIT)

Adjust VR4 for 9V between the terminal "g" and chassis.

ADJUSTMENT OF AGC BIAS (AF.AVR UNIT)
Adjust VA' for 3.5V between the terminal "AF'" and the

chassis.

RIT ADJUSTMENT (AF-AVR ~NIT)
Set the AIT knob to its center position and turn on the AIT

switch. Aotate the main tuning knob until the marker signal

can be heard in suitable beat tone. Then, adjust VA2 so that
the beat tone is not varied regardless of the positi.on of the

AIT switch.

MARKER FREQUENCY CALIBRATION (MARKER

UNIT)

The marker frequency is factory adjusted prior to shipment.

However. if it is deviated after a long period of use of the set.

it must be calibrated accurately TS-820S is designed to

receive WWV signals so that the marker frequency can be
calibrated precisely.

Set the BAND switch on the front to WWV and turn the
main tuning knob until it is aligned with the "0" on the sub
dial A standard 15 MHz WWV beat signal will be received.

By setting the FUNCTION switch to CAL-25 kHz. this beat

signal is superposed on the marker beat signal and is heard
as a double beat signal. Adjust the ceramic trimmer TC1 un­til a zero beat is obtained The marker frequency is now fully

calibrated.

COUNTER FREQUENCY CALIBRATION
(COUNTER UNIT. OPTION)

With the FUNCTION switch in the VFO position. turn the

BAND switch to receive 15 MHz WWV standard signal. By

connecting the counter calibration cable suppled to the

counter unit and the X VERTER IN jack on the rear panel. the
WWV beat signal is superposed on the higher harmonics of
the standard signal of the counter and is heard as a double

beat signal. Adjust the trimmer of the counter unit to obtain

a zero beat. By so doing. the frequency indicated on the di-

gital display is accurately calibrated. After the calibration.
disconnect the counter calibration cable.

Set the FUNCTION switch to CAL.25 kHz to receive a

marker signal Make certain that the ANT terminals are shorted

ted with a 50 ~ 7511 resistor With the DRIVE knob set to
its center position. adjust the ANT and MIX coils for maxi-

mum deflection of the S meter. using the frequency table gi­ven below In adjustment. start with the 1 8 MHz band and
then proceed to other bands To adjust the 10m band. use
only 29.0 MHz in the 290 MHz band

ADJUSTMENT OF RECEIVE IF COIL
(RF AND IF UNITS)

Receive 25 kHz marker signal using any frequency Adjust
the DRIVE knob and the main tuning knob for maximum def-

lection of the S meter Then adjust T2 of the RF unit and T 4,

T5 and T7 of the IF unit until the S meter indicates maxI-

mum deflection. Do not touch T1. T2, T3 and T6.

S METER ADJUSTMENT (IF UNIT)
Disconnect the antenna and set the transceiver in receive

mode. The zero-point adjustment of the S meter can now
be acomplished in the following manner:

Adjust VA 1 so that the meter pointer indicates its minimum
position. If a standard signal generator (SSG) is available.

adjust VA2 until the S meter indicates "g", using
14 175 MHz 40 dB signal (reading on SSG)

ADJUSTMENT OF ANT AND MIX COILS
(COIL PACK UNIT)

The ANT coil and MIX coil are included in the coil pack unit.

38

-

6.4 ADJUSTMENT OF TRANSMITTER
SECTION

ADJUSTMENT OF TRANSMIT DRIVE COIL

(COIL PACK UNIT)

ADJUSTMENT OF SIDE TONE LEVEL (AF-AVR UNIT)

Adjust VR3 to your desired level.

ADJUSTMENT OF MONITOR LEVEL (IF UNIT)

The drive coil is built in the coil pack unit. Set the SG switch

on the rear panel to OFF and the D RIVE knob to its center
position Then. set the METER switch to ALC and the
MODE switch to CW or TUN position.
With the standby switch in the SEND position. adjust the
drive coils for maximurQ ALC deflection for each band using
the same frequency as for the adjustment of ANT and MIX
coils

During the adjustment. turn the CAR knob just enough to

swing the meter (ALCI. This adjustment ~an be started with

any band.

ADJUSTMENT OF TRANSMIT IF COIL

(IF AND RF UNITS)

Using any frequency. set the transceiver in transmit mode at
CW or TUN position. Adjust T5 of the IF unit and T1 of the
RF unit until the meter (ALC) indicates maximum deflection.

CARRIER BALANCE ADJUSTMENT (IF UNIT!
(See Fig. 31)

With a dummy load connected to the ANT terminals, adjust
for the maximurn output using 14.175 MHz frequency. Set
the transceiver in LSB mode and turn the RF VOLT knob on
the. rear panel for maximum sensitivity. The pointer of the
RF meter will deflect if the carrier is unbalanced. In this

case, be sure to turn the MIC knob to the minimum position.
To balance the carrier, adjust the trimmer TC2 and the semi­fixed resistor VR5 alternately until the meter pointer in­dicates a minimum position. Change the mode to usa and

if the pointer deflects. then readjust so that the pointer

deflects the' same amount for both LSB and usa.

Adjust VR4 to your desired level

(j)

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OD'D@ 0

Fig. 31 Counter Frquency Calibration

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D

NEUTRALIZING THE FINAL STAGE

Adjust the drive and final stages completely using

21.3 MHz. with a dummy load connected.
Set the SG switch to OFF and measure the output at the
ANT terminals (shorted with dummy load) with a high sensi-

tivity RF voltmeter or a tester having a rectifying diode such
as 1N60. Then turn the nuetralizing variable capacitor (TC1
viewed through the adjusting hole in the upper panel of the
final box) for minimum output. Normally. it is unnecessary
to remove the shielding case for this adjustment. but be sure
to use a insulated screwdriver Use of a non-insulated
screwdriver will result in incorrect adjustment and also
cause electric shocks.

39

~

~

7.1 GENERAL INFORMATION

The problems described in this table are failures caused in

general by improper operation or connection of the
transceiver. not by defective components There is a

separate service manual for repair of the TS-820S

7.2 TRANSMITTER AND RECEIVER CIRCUITS

~ --

SYMPTOMS I

P..IO" lights d:=== light an~t~ere i:;: r;. B~ power cable or connections
receiver noise when the POWER,swltch is I 2 Blown power suPflly fuse.

turned on. j 3. Wrong polarIty connoctton for DC

operation.

Frequency difference betWeen transmit

and receive.

FMmg on sideband operatIon

1. 9 VDC supply not adjusted

2. ~hort circuit In 9 volt 'lOwer supply or
line.

3. Improper battery voltlJgf' In mobile or
portable operation.

CAUSE

REMEDY

-,---=

1 Check cahll'~ and COnnf!CIIOn~

2 Replace Ihe lusl:.

3 Check lor it negallvl: ground IIOW"

~-

conm,cllon

1 See Section 63

2. Chock the 9 volt supply

3 Ch',ck battery or alturnator voltayf'

VFO (or F I X I indicator does not light.

The relays operate with the stand. by
switch in the REC position.

-~

Signal reports of off frequency operation
even though the dial scale is calibrated.

-

7.3 RECEIVER SECTION

SYMPTOMS

Accessory CW filter is installed but selec
tivity and intelligibility are poor.

An antenna is connected but no signals

are heard

---

-

An antenna is connected and the calibrator

signal is received. but no signals are heard.
One or more bands are operating but some

are not.

S.meter

S-meter reads too high or too low

lects without a received signal

1. Rear panel VFO plug not inserted

1 Improper microphone connection

~ 1. Calibrator requires aligrlment

CAUSE

1. Connection of IF board not moved to CW

2. Bad CW filter.
1 Inoperative VFO or FC oscillator.

2 MIcrophone PTT switch lor stand.by

switch) is In the transmit position.

3 Transverter switch is ON

1. Bad T/R relay.

1. The Pll unit is not operating on the defective

band

2. The antenna coil of the defective band
requires alignment.

-

1. IF board is out of adjustment

2. Low AC line voltage.

-

1. IF board is OU1 of adjustment.

2 RF gain control closed causing low

sensitivity.

1. Receiver section requires realignment.

1. The RIT control is out of adjustment.

1 See Secton 63

REMEDY

1. See Section 62

2. Replace thlJ CW flltlJr
1 Insert the shunt plug Into back

panel

2. Release the PTT switch.

3 Turn the switch OFF

.

1. Replace the relay.

Repair the PLL unit

2 See Section 63

-

1 See Section 63

2 Use a step-up transformer to raise

the line voltage

1 See Section 63

2 Open RF GAIN control

1. See Section 63

1. See Section 6.3

sse signal unintelligible.

sse received signal IS extremely high cut (or

low cut)

40

1. AfT circuit off

-

1. MODE switch is set to wrong sideband.

1 If SHIFT is out of adj"stment

1. Push RIT button.

1. Turn MODE switch to correct side

band

1 Set it in the center (on the position of clIck) 1

--

7.4 TRANSMITTER SECTION

SYMPTOMS CAUSE

RF meter deflects with no output (no plate
current.)

ALC meter does not deflect and there is

output. '

The TS.820 will not operate on sse.

There is output, but the RF meter shows
no output.

RF meter deflects too fIr.

VOX does not operate,

--

vox trips with AF sound from the speak-

er.

VOX circuit releases between words or
holds ~oo long.

Excessive plate current.

1. No high voltage (+800v) on the final
tubes.

2. Bad final tubes.

3. SG switch is turned off.

'" .

1. Too little MIC gain.

\ 1. Open microphone plug or bad micro-

phone.

2. Too little microphone gain.

3. Defective microphone amplifier on the
GENERATOR board.

,

1. RF VOLT control not adjusted cor.

rectlv.

1. RF VOLT control not adjusted cor.
rectlv.

1. VOX GAIN control is closed.

2. VOX switch is OFF.

1. ANTI VOX control requires adjust-
ment.

kI~".:, ,oqw... ..i."I' 1. VOX time hold control requires adju8t- 1. See Section 412.

ment.

1. Detuned final section.

2. Low negative power supply voltage.

3. Idling current requires adjustment.

~--

REMEDY

1. Check the HV power supply

2. Replace the tubes.

3. Slide the switch up.

lncrease the MIC GAIN control.

1. Check the microphone.

I 2. Increase the MIC GAIN control

3. Repair the circuit.

1. Adjust control for 2/3 scale reading
at full output.

1. Adjust control for 2/3 scale reading
at full output.

1. See Section 412

2. Turn the switch on,

1. See Section 4,12,

1. See Section 64

2. Check the power supply output.

3. See Section 4 11

".--

Low drive on one or more bends but not
on all bands.
Broad DRIVE tuning on one or more

bands.

No drive or intermittent drive on one or
more bands.

Low drive and broad DRIVE tuning on all

bands.

Plate current is too low.
Tuning becomes very broad.

Idling current increases.

Every time either of the final tubes is
replace, the TS.820S requires neutraliza-

tion.

1. Carrier requires adjustment.

1 PLL unit requires adjustment

1. Bad driver tube.

1. Carrier requires balancing.

1. Too much microphone gain.

1. Bad final tubes.

1. Adjust CAR control.

I ,. Replace the tube.

1. Replace the tubes.

41

II :..

4l