Kenwood TS-820S User manual

-IMPORTANT
'
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
3
4
6
4.11 Transmitter Tuning
4.12 SSB Operation
4.13 CW Operation
4.14 Operation with a Linear Amplifier
4.15 Fixed Frequency Operation
4.16 Internal Cross Channel Operation
4.17 Mobile Operation
4.1B DX Operation (Use of Processor)
4.19 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
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 ,
9
16
40
TOP and BOTTOM VIEW OF THE TS-820
SCHEMATIC DIAGRAM
42
43
TS-820S SPECIFICATIONSSECTION 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 CONTROLS3.1 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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TS-820S SPECIFICATION
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FREQUENCY RANGE 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
MOD E ~POWER REQUIREMENTS
PLATE POWER INPUT 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~-
AUDIO INPUT IMPEDANCE ...
AUDIO OUTPUT IMPEDANCE
AUDIO OUTPUTRF OUTPUT IMPEDANCE.,FREQUENCY STABILITY,
r-
AUDID FREQUENCY RESPONSE
CARRIER SUPPRESSIONSIDEBAND SUPPRESSIONIMAGE RATIO.HARMONIC RADIATIONSPURIOUS RADIATIONIF REJECTION ,RECEIVER SENSITIVITYRECEIVER SELECTIVITY
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
Within 100 Hz during any 30 minute period after warmup
Within :.t1 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)
IF 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)
TUBE AND SEMICONDUCTOR
COMPLEMENT 1:o-tl205
3
38
31
95
195
Tubes
IC'S
FET'S
Transistors
DiOdes
3
5
30
74
167
DIMENSIONS
WEIGHT
13.2" wide x 5.9"high x 13.2" deep
37.4 Ibs.
3

SECTION 1. FEATURES
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
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 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
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. 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
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 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.
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
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
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
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.
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.
14. ,Built-in AC Power Supply. and DC Operation with
Optional DC-DC Converter
DC-DC Converter DS-1A (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)
"
7. Digital Display Dial
The digital dial of TS-820S indicates transmit and
receive frequencies using carrier. VFO and local oscil-
lator 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 ac-
curately up to 100 Hz order by calibrating the oscillator
with WWV.
The green indication on the dial assures many hours of
fatigue less operation
4
'" :

2.1 UNPACKING 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 an-
tenna 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 Hand-
book. 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 in-
creased if a good directional rotary antenna is used Re-
member that even the most powerful transceiver is useless
without a proper antenna.
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 immedia-
tely. It is a good idea to save the boxes and packing material
in any case because they are very useful for shipping or mo-
ving the equipment.
The following accessories should be included with the trans-
ceiver:
Mobile Station -Mobile antenna installations are critical.
since any mobile antenna for use on the high frequency
bands represents a number of compromises. Many ama-
teurs 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.
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) .
--- 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.
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).
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 an-
tenna 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 be-
comes. 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.
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 desi-
gned 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-out-
put 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-
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 redu-
ced in an effort to bring SWR down. Since field strength is
the primary goal. we recommend a field strength meter for
antenna tuning.
5

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.
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 an-
tenna 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.
TS-820S
MIC Connector
MIC
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 po-
wer.
2.6 KEY
If CW operation is desired. connect a key to the KEY jack
2.7 EXTERNAL SPEAKER AND
HEADPHONES
2.5 MICROPHONE
Attach the microphone connector to a suitable microphone
as shown in Figure 2 Be sure that the PTTswitch of the mi-
crophone is separate from the microphone circuit. as shown
in Figure 3.
It should be noted that a microphone with a 3P plug having
a common earth terminal cannot be used.
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 opera-
tion. 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.
The microphone input is designed for high impedance (50k
ohms) microphones only. The choice of microphone is im-
portant for good speech quality. and should be given serious
consideration. The crystal lattice filter in the transceiver pro-
vides 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.
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.
The microphone manufacture's instructions should be follo-
wed 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 micro-
phone case and permanently connecting the contacts which
control the microphone.
2.9 GROUND
So preventing to receive an electric shock. TVI and BCI.
select a good. effective ground for installation and then con-
nect 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.
6"..

-(b~:f{l
=
-\
L~
1 .
~
Fig. 2 Microphone Connection Wiring
7

---
~
8
0_""- ~,."-"". -,"

1
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3.1 FRONT PANEL CONTROLS
CD METER
@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
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 si-
gnal 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
@RIT INDICATOR
This light emitting diode is illuminated when the RIT circuit
is turned on. showing that the transmit and receive frequen-
cies may be different
~ METERSWITCH
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):
<1) SUB-DIAL
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.
ALC (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
@ 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.
(Plate Current) -In this position the meter moni-
tors the plate current of the final tubes. The me-
ter scale is calibrated from 0 to 350 ma.
IP (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
(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.
RF: @ 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
This indicates the state of compression when the
speech processor is operated.
caMP: @ STAND-BY SWITCH
This two position lever switch selects one of the following
functions
(High Voltage) -In this position the meter moni-
tors the high voltage from the power supply. The
meter scale is calibrated from 0 to 10. indicating
0 to 1000 volts.
HV The transceiver is receiving unless the micro-
phone PTT switch is switched to transmit, or the
VOX circuit is activated.
REC:
SEND The TS-820S is locked into the transmit mode in
this switch position.
@ 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
-

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 ino-
perative in the TUN mode, the transceiver cannot
be used for transmission or reception.
@ 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.
CW: Used for CW operation
vox With the switch in this position. the VOX circuit is
turned on for voice operated transmit on. SSB se-
mi-automatic break-in operation on CWo use Used for USB operation It is internationally de.
termined that the 14. 21 and 28 MHz bands be.
long to USB.
@NB SWITCH
LSBThe NB switch turns the built-in noise blanker circuit on and
off. The noise blanker is designed to reduce pulsating igni-
tion type noises. When the lever switch is flipped up. the
circuit is turned on.
Used for LSB operation. It is internationally de-
termined that the 3.5 and 7 MHz bands belong to
LSB.
For RTTY operation with teletypewriter.
@ MONI (MONITOR) SWITCH
This switch is used to demodulate part of the output of the
transmit IF amplifier for monitoring transmit signals.
@) 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.
~
@ 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.
@ 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.
FAST: The FAST AGC position is designed for use in CW
operation. @ 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.
SLOW: Use the SLOW AGC position for SSB operation
@ PHONES JACK
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 dis-
connected.
@ 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.
@ 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.
@ RF ATT SWITCH
With this switch set to ON. ATT (attenuator) of about 20 dB
is connected to the antenna circuit. protecting the RF ampli-
fier and mixer circuit from strong input signals.
@ MODE SWITCH
The MODE switch is used for selection of type of waves or
for TUNE operation.
@ 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
11

fixed channel crystals are installed in the transcei.
verI.
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. @ 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.
@ BAND SWITCH
This 11-position switch selects all the necessary circuits to
tune the transceiver to the desired 500 kHz band.
~~ POWER SWITCH
The POWER switch turns all the power on and off in
TS-8205.
@ FUNCTION SWITCH, ,
This 7 -position rotary switch selects one of the following
transceive functions.
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 cry-
stal 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,
GAL
FIX:
@ 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 nor-
mal operation. this knob should be set to the center position
(click is heard).
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.
CAL.
RMT
(: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.
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.
CAL-
25 kHz:
The switch is kept in this position for normal
transceive operation.
VFO:
@ CAR (CARRIER) LEVEL KNOB
Used to adjust carrier level during CW operation. Adjust so
that the meter does not deflect beyond the ALC lond.
With the switch in this position. the TS.820S's in-
ternal 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).
VFO.R @ 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.
With the switch in this position, the TS-820S's in-
ternal VFO controls the transmit function and the
built-in fixed channel oscillator controls the re-
ceive function (if fixed channel crystals are instal-
led in the oscillator) The VFO.R and FIX.R allow
cross-channel operation without an external VFO.
FIXR: @ 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
With the switch in this position. the IS-820S's
fixed channel oscillator controls the transmit and
receive function of the transceiver (if accessory
-
FIX:
12

@
the transceiver. Fixed frequency operation is convenient for
operation on often used frequencies. The fixed channel os-
cillator replaces the VFO when the FUNCTION switch is pla-
ced in the FIX position.
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.
@DRIVE KNOB @DH (DISPLAY HOLD) SWITCH
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.
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 fre-
quency when checking other frequencies. The DH switch
being ON turns off the lights for "MHz" frequencies, elimina-
ting a worry about mis-reading frequencies.
@PLATE KNOB
The PLATE control adjusts the plate tuning of the two final
amplifier tubes.
13

3.2 REAR PAN EL CONTROLS 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.
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. @ AC VOLTAGE SELECT SWITCH
This slide switch switches the primary of the power transfor
mer to select 120 or 220 VAC operation.
@ COOLING FAN
This fan cools the RF amplifier section of the TS-820S to in-
sure reliable and efficient opera'tion. C!~ POWER SUPPLY CONNECTOR
This 12-pin connector is usedto connect anAC or DCpower
source to the transceiver.
@ 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.
~2) TRANSVERTER CONNECTOR
This 12-pin connector is used to control an accessory VH F
transverter.
@ 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.nthe
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. @ 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.
@ 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
@ 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.
@ GND (GROUND) LUG
To prevent accidental shocks from the chassis. as well as in-
terference. connect a good earth ground to this lug.
SPEAKER JACK
(~
@ 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.
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 con-
nected
~
14

@) IF OUT JACK
Receive signals from the final IF 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)
@ EXTERNAL VFO CONNECTOR
This 9-pin connector provides a means of interconnecting
the KENWOOD VFO-820. another external VFO. or an ex-
ternal 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. @ 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.
@ 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)
15

i SECTION 4. OPERATING INSTRUCTIONS ,
'_Nt.ouo...0nil0.,HI".ouu 0nuo.oIIU'...HI'.01t'0o.0no.. 0_. oHllO..u0p.oUUo.ouuo."UI'. ouop O U'._."""._.0 o ,_Nt. u
Push the POWER switch on. The meter. dial scale. and VFO
indicator will light. indicating that the transceiver is opera-
ting 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.
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 con-
ditions 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, 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
Be sure to complete all of the required cabling. as described
in Section 2.3 " 2.8.
With a suitableantenna and microphone (or key)connected
to the transceiver. setthe T5-8205 switches to positions des-
cribed in Table 1 4.3 READING THE OPERATING
FREQUENCY
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 proce-
dure.
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 fre-
quency 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
POSITION
CONTROL
CONTROL LOCATION -
FRONT PANEL CONTROLS -
Desired band
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
REAR PANEL CONTROLS
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.
16

scale and the digital display. the correct frequency is on the
digital display In this case. the analog dial should be ca-
librated with the calibrate knob.
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.
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"
When CW filter is used. turn the dial when the marker signal
casues maximum deflection on the S meter and then cali-
brate 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.
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.
4.4 CALIBRATING THE FREQUENCIES 4.5 RF GAIN
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 redu-
ces the incoming signal and the marker signal can be recei-
ved more easily Detailed method of calibration is described
below.
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 du-
ring 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
sse 4.6 RF ATT
Set the MODE switch to use or LSe Marker signals are re-
ceived at every 25 kHz so accurate calibration is possible
over the entire range of the dial.
If the transceiver is operated in a short-distance (within
several hundred meters) and strong signals of nearby fre-
quencies 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
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.
17

switch to SEND and check that the plate current (IP) is 60
ma. If the plate CUIrent 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.
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:
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.
DRIVE TUNING (See Fig 8)
Adjustment of Tonal Quality and Interference Rejection
during SSB Reception. 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.
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
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
2
3NOTE: 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.
For detailed descriptions, refer to Section 413 "CW
operation",
FSK (ATTY) Operation at 850 Hz Shift
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.
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
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
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.
4.11 TRANSMITTER TUNING
Connectthe T5-8205 to a 50 ohm dummyload or a 50 ohm
antennawith 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
NOTE 1: The ALC meter is less deflected at the ON posi-
tIon 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.
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 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,
~
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
18

Table 2. Initial Switch Settings for Transmission
(The controls not described should be set as described in Table 1)
LOCATION CONTROL POSITION
FRONT PANEL CONTROLS
REAR PANEL CONTROLS
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 .
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
19

4.12 SSB OPERATION 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.
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 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
NOTE: International amateur practice dictates using use
or LSB on the following bands
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 refer-
ring to page 34,
Key the transmitter and speak Into the microphone with the
tone of voice used in normal operation. Adjust the MIC con-
trol 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 com-
munication. depress PTT switch with 5T ANDBY switch left
in the REC position.
VOX OPERATION
Adjust the transceiver as des(;ribed in the previous para-
graph. Flip the VOX switch on and close-talk Into the micro-
phone. 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
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.
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 re-
lease time constant by turning the DELAY control.
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
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
.
20