Kenwood TS-820 User manual

(f) KEN
'
Model TS-820
OPERATING MANUAL

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....- . ·.
CONTENTS
,
;. I
TS - 820 SPECIFICATIONS .................. ... ...... ...... .. ... . 3
SECTION 1 FEATURES........................................ 4
SECTION 2 INSTALLATION ..... ...... ................. ..... 5
. 2.1 Unpacking
fl.2 Operation location
2.3 Power Connections
2 .4 Antenna
2.5 Microphone
2.6 Key
2.7 Ex ternal Speaker and Headphone
2.8 ' RTTY (FSK)
2 .9 Gro und
SECTION 3 OPERATING CONTROLS .... ......... . .... 9
3.1
Fr ont Panel Controls
3.2
Rear Panel Controls
SECTION 4 OPERATING INSTRUCTIONS ...... .... 16
4.1
Preliminary Procedure
4.2 Receiver Tuning
4.3 Read iog 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)
4.11
Transm itte r Tuning
4.12
SSB Operation
4. 13
CW Operation
4 .14
Operation with a linea r Amplifier
4. 15
Fi xe d Frequency Operation
4. 16
Internal Cross Channel Operation
4. 17
Mobile Operation
4.18
OX Operation (Use of Processor )
4.
19
RTTY Operation
4 .20
SSTV (Slow Scan TV} Operation
4.21
Operation with a Phone Patch
4.22 U se of Monitor Switch
4.23 Novice Operation
TS- 820 BLOCK DIAGRAM ....... ..... .......................... 24
SECTION 5 CIRCUIT DESCRIPTION ................. .. 25
5.1
5
.2
5.3
Block Diagram
Board and Unit
Final Stage Power Amplifier
SECTION 6 MAINTENANCE AND ALIGNMENT . 33
6.1 Generallnformation
6.2 Accessories
6.3 . Adju stment of Recei ve r Section
6.4 Adju stment of Transmitter Section
SECTION 7 TROUBLESHOOTING ....... ....... .......... 40
TOP and BOTTOM VIEW OF THE TS-820 ............. 42
SCHEMATIC DIAGRAM .......................... ...... ...... .... 43
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: TS-8~0 SPECIFICATION I
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F REQUENCY RANGE .. ........................... 1 60 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 MH z
20 meter band
14 . 00
to 14 .35 MHz
15 meter ba nd 21 . 00 to 2145 MHz
10 meter band
28.00
to 28.50 MHz (A)
10 meter band 28 . 50 to 29 . 00 MHz (B)
10 mete r band 29.00 to 29 .50 MHz (C)
10 meter band 29.50 to 29 . 70 MHz (D)
· wwv 15.0 MHz (~eceive only)
MODE ................. .............. ................. .... USB. LSB. or CW. FSK
POWER REQUIREMENTS ............. .. . .... .. 1
20/220 VA C. 50/60 Hz operati on 13 . 8V DC'operation
Rece rve
45 watts !hearers on)
SA
{heaters on)
26 watts theaters orfl 0.6A (heaters off)
Transm it 280 wa tts (maximum) 15A {maximum)
PLATE POWER I NPUT ...... ................... ..
120/ 22 0 VAC. 50 / 60Hz operation
13 . 8V DC operat ion
200 walls PEP for SSB operation 120 w atts PEP for SSB operation
160 walls DC for CW operation 90 watts DC for CW op eration
100 watts for F SK operation
60 watts for FSK operation
AUD IO INPUT IMPEDAN CE .................. 50 k oh ms {high im pedance)
A UDI O OU TPUT IMPED ANC E...... .... ..... 4 to 16 ohms (speaker or headphon es)
AUDIO OU TPUT .... .............. .. ...... .... ...... More than 1.5 watts (with less than 10% distortion) in to an 8 ohrn load.
RF
OUTPUT IMPED ANCE ...................... 50,....., 75 ohms
FREQUENCY STABILITY .. .... .............. .. Within 1 00Hz d ur ing any 30 minute period after wa r mup
Within ±1 kHz during the first hour after 1 min ute of warmup
AUDIO F REQUENC Y RESPONSE ........... 4 00 to 2600Hz , within - 6 db
CA RRIER SUPPRESSION ............... .. ....: Carrier better than 40 db down from the out put signal
SIDEB AND SUPPRESSION ........ .... ....... Unwanted si de band is better than 50 db down fr om the outpu t signal
IM AGE RATIO .......... .. .. .. .................... .. . Image fr equency b ette r than 60 db (50 db for 10 meter band) down from the
output signal
~~ H AR M ONJC R ADIA TION ...... .. ............... Better than 40 db down from output signal
SPURIOUS RADIA TI ON ....... .. ............... Be tt er than 60 db dow n from output signal (withou t spur io us radiation)
IF REJECTION ........................ .. ............. IF frequency is 80 db or more dow n fr Of!l output signal
RECEIVER
SENSI TI VI TY .. .. .... .. .. ... .. ...... 0. 25 JlV S+N/N 10 db or more
" RECEIVER SELECTIVITY ........................ SSB: 2.4 kHz ban dw idth (- 6 db down}
4.4 kHz bandwidth (- 60 db down)
0.5 kHz bandw idth (- 6 db down)
1.8 kHz bandwidth (- 60 db down)
• (wit h optio .nal CW filter insta ll ed)
TUBE AND SEMICONDUC TOR .. ...........
COMP LEMENT
3 Tubes
5 IC's
30 F ET 's
74 Transistors
167 Diodes
DIMENSIONS ....................... .... .... ....... .. 13.2" wide x 5.9"high x 1 3.2" deep
WEIG HT ......... .. ........................ .. ............ 37 .4 lb s.
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I SECTION 1. FEATURES i
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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 RT TY operations.
2. Minimum Spuri ous and Excellent Overload
and Crossmod. Characteristic
The adopt ion of FET baianced type mixe r. MO S FET and
single conversion system minimizes s' purious during
transm ission and assures excellent overload and cross-
mod. characteristic dur ing reception.
3. Built-in IF SHIFT Circuit
IF SHIFT circuit is bui lt in the transceiver to shift IF pass
band without changing receive frequency. The circuit is
also called the "pass band tuning circuit". It allows you
to eliminate radio interference or set the receive fre-
quency character istic to the desired bandwidth simply
by manipula ting one control knob.
4. Built-in RF Processor
The unique speech processor uses a quick time constan t
at 455 kH z. Since this circuit is of RF type. it produces
litt le distortion and. unl ike the clipper system, does not
deteriorate the tonal qualit y.
5. RF NFB
RF N FB from the transmit final sta ge to. the driver stage
improves the cross modulation distortio n. The use of
the amplification type ALC fu r ther improves the quality
of transm it signals.
6. Newly Design ed Analog Dial
The combination of newly designed mono-sca le and su-
b-dial provides easy reading of frequencies. The adop -
t ion of a ci rcuit that is complete ly free from changes in
carrier frequencies
perm i ts accurate indication of fre-
quencies on one dial_pointer.
7. Rigid Structure and Ea sy 0 per at ion
The transce iver is built with a die casting front panel
and a rigid chassis.
provid i ng outstanding mechanical
stability for mobile operation. All the operat i ng part~
such as contro l knobs and dials are designed and arran-
ged accor di ng to human engineeri ng tech nol ogy to en-
sure maximum case of ope ratio n.
8. Monitor Circuit
4
The monitor circu it allow s you to hear your own voice
during transmission. wh ic h is normally impossible with
conventional tr ansceivers. This IS very useful when
checking the modulation condition or adjusting the RF
processor.
9 . Selector Switch f or SSB / CW Re ceive
Frequency R esponse
During CW reception the audio fr equency response is
au tomatically narrowed to improve the clarity of sound.
10 . Build -i n Fixed Channel Circuits with AIT
(crystals are optional)
The f 1xed cha nn el circuits w it h RI T permit the use wi th
the built-in VFO tor more en joyab le operation.
11. Transverte r Connector
Transverter TV-502 (2m) can be connected for ready
operation . Changeover to HF or VHF is accomplished
automatically wit h the power switch of the transverter.
12. Built-in AC Power Supply , and DC Operation with
Optional DC - DC Converter
DC-DC Co nverter DS-1 (option ) can be attached to the
transceiver
for mobile operation.
13. Wide Va riety of Aux il iary Circuits
and Devi ces
The transceiver is c ompleted with a noise blanker
circuit.
VOX ci rcuit. side tone circuit. marker circuit.
built-in speaker. 3-
posit ion AGC switch. heater switch.
IF OUT ter minal and linear terminal.
The
follow ing devices are availa ble as optional extra:
Remote VFO (V F 0-820). CW Filter (YG-88C). Digital
Display (OG-1
). Transverter (TV-502). Microphone
(MC- 50). Low Pass Filter (LF -3 0A). ·
14 .. Use of Digital Display Dial DG-1 (option)
1) Digital Display D ial
The di gital dial of T S-820 indicates transmit and receive
frequencies using carrier. VFO and local oscillator
signals instead
of converting VFO frequencies. Thus,
acc urat e 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
1
MHz standard oscillator, frequencies can be read ac-
curately up to 10 0Hz order by calibrating the oscillator
with WWV.
The green indication on the dial assures many hours of
fatigueless operat ion.
2) O.H (display hold) Switch
By pressing the O.H switch. the frequency read on the
digital remains on, th us serving as a memory system.
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f SECTION 2. INSTALLATION I
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2.1 UNPACKING
Remove the TS-820 from i ts shipping box and packing
material and examine it for visible damage. If t he equipment
has been damaged in shipment. save the boxes and packi ng
material and notify the transportation company immed ia-
tely . It is a good idea to save the boxes and pack ing mater i al
in any case because they are very useful for shipping or mo-
ving the equipment.
T he following accessories should be included with the trans·
ceiver:
Operating Manual
Microphone Pl ug
1 J umpe red 9- pin Plug (installed)
5 RCA Phono Plugs
1 Al
ignment Too l
2 Plastic
htension Fe et
with Screws
AC Power Cord
Speaker Plug
l
8P US Plug
4 Fuse
(6A X 2. 4A X 2)
2.2 OPERATION LOCATION
As wi th any solid state electronic equi pment the TS-820
should be kept from extremes of heat and humidity.
Choose an operating lo catio n that is dry and cool , and avoid ·
operating the transceiver in direct sun lig ht. Also. allow at
least 3 inches clearance betwe en the ba ck of the equipment
and any object. This space allows an adeq uate air flow from
the
venti lating fan to keep the transceiver cool.
2.3 POWER CONNECTIONS
Make sure the POWER sw itch on the front panel of the
TS-820 is turned off . th e stand-by switc h is put in t he REC
posit ion. and t hat the vo ltage sw it ch on th e back of the
TS -820 is sw it ched 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 f or use on the high frequen cy amateur ban ds may be
used
with the T S-820. provided the input impedance of the
transmission line is
not outside the capability of the pi- out -
put m
at ching network . The transmiss ion li ne should be of
the coaxial cable type . An antenna system which shows a
standing
wave ra t io of less than 2 : 1 when us i ng 50 or 75
ohm coaxial transmiss i on li ne . or a system that resu lt s in a
transmission line
input impedance that is esse nt ia ll y resisti-
ve . a nd between 15 and 200 ohms wil l take power from the
transceiver
with li tt le di ff iculty . If ope n wire or balanced type
transmission line is used
wit h the antenna. a suitable an-
tenna tuner is re commended between the transceiver and
the feed line.
Me tho ds of constructi on a nd operat i ng such
tuners are descri
bed in detail in the ARRL Antenna Hand-
boo k. and sim ilar publ ication s. For operation on 75 and 40
meter band s. a simple dipole antenna. cut to resor1 ance in
the
most used por t ion of the bands. wi ll perform satisfacto-
rily. Fo r operation of the transceiver on the 10. 15. and 20
meter bands. the efficiency of the statio n wi ll 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 ante nn a.
Mobile Station - Mo bi le 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 e ffi ciency of their antenna through improper
tuning . Remember the fol lowi ng points when us i ng the
TS-820 wit h a mobile antenna.
The
"Q" of the antenna loading co il should be as high as
possible. There a
re several comme rcial mode ls available
whic h use h igh "Q '' co il s.
The loading coil
must be capab le of handling the powe r of
the transceiver
without overheating. In the CW mode the
power output of the transcei ver will exceed 80 watts .
The
SWR bridge is a usef ul instrument. but unfortunately it
is
quite often misunderstood. and overrated in importance .
8asically. the
SWR br idge will indicate how closely the an-
tenna load impedance matc hes the transmission line. With
long tran sm ission lines. such as w ill be used in many fixed
stat ion installations. it is.desirable to keep the impedance
match f airly close in order to l im it power loss. This is parti -
cularly true at ·the higher frequencies. The longer the line.
and the
higher the frequency, the more im portant SWR be-
comes. However. in mobile installations the transmission
line seldom exceeds
20 fe et in length. and an SWR of even
4 to l adds very li
ttle power loss. The only time SWR wil l
in
dicate a low figure is when the a nt enna presents a load
close the
50 ohms. but · many mobile a nt ennas will have a
ba
se •mpedance as low as 15 or 20 ohms at their resonant
f
re quency. In su ch a case. SWR wi ll i ndicate 3 or 4 to l.
and yet the system will be radi ating eff iciently.
The really i
mportant fact or in yo ur mob ile ant enna is that is
sh
ou ld be carefu ll y tuned to resonance at the desired fre·
quency. The fallacy in us ing an SWR bridge lies in the fact
t hat it is sometimes possible to reduce t he SWR reading by
detu ning the antenna. Field strength may actually be redu·
ced in an effort to bring S WR dow n. Since field strength is
the
primary goal. we recommend a fie ld stren gth meter for
antenna tun ing.
5
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· -- ------------· -· . .. ·. .. . .... -- - - - ---- · -- ------·-- ~ - -"

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For antenna adjustments. the transceiver may be loaded
lightly. using the
TUN posi tion i ns tead of ope r ating at f ull
power output. This will limit tube dissipation during adjust·
ments . a nd will also help to reduce i nterf erence on the fre·
quency In a ny case. do no t le ave the transmitter on for very •
long at one time. Turn it on . iust long enough to tune and
load. and get a field strength reading. Start out with the an-
tenna whip at about the center of it s adjust m ent range. Set
the VFO to the desired operating freque ncy and then adjust
the PLATE co nt rol fo r a dip, and then the LOAD control.
Then observe the field strength reading. The field st rength
meter may be set on top of the dash. on the hood, or at an
elevated
location some distance from the ca r.
Change the whip length a half inch. or so at a time. ret u ne
the finals each time. and again check the field strength at the
antenna.
Cont i nue this procedure until the point of maxi-
mum field stren gt h is found. This adjustment will be most
critical on 75 meters, somewhat less crit ical on 40, until on
10 meters the adjustment will be quite broad. After tuni ng
the antenna to resonance. the finals can be loaded to full po·
wer .
2.5 MICROPHONE
Attach the microphone connector to a suitable microphone
as show n in Figure 2. Be sure that the PTT switch of the mi -
crophone is separa te from the microphone circuit, as show n
in Fi gure 3.
It shou ld be no ted that a microphone with a 3P plug havi ng
a common earth terminal ca nnot be used.
The
microphone input is designed for high impeda nce (50 k
ohms) microphones only. The choice of microphone is im-
portant for good speech quality. and should be given ser ious
conside ra tion. The crystal l att ice fi lt er in the transceiver pro-
vides all the rest ri ctio n necessary on audio response. and
further r estrict ion in the microphone is not required. It is
more important to have a microphone with a smooth. flat re ··
sponse throughout t he speech range.
The
microphone manufacture's instructions should be folio·
wed in conne ct i ng the mi crophone cable to the plug. With
many microphones, the pus h -to -talk butto n must be pressed
to make th e microphone operative. For P TI operation. this
feature may be disabled. if des ir ed. by opening the micro -
phone case and permanent ly connecting the contacts which
control the microphone.
6
The stand ar d microphone sensitivity is within the range of
- 50 dB to - 60 dB . If a mic rophone having a higher sensi·
tiv i ty is used. the ALC circuit wi ll not function properly. In
th is case. insert an attenuator as shown in the i llustratio n at
right or connect a resistor (1 Ok ,...., 33k ohms) in parallel
with the c:apacitor 1 00 pF (C94) in the IF unit
(X48-l l 50-00) of the transceiver.
MIC
2.6 KEY
1OkH to 331<:11
x
0 TS-
82 0
M 1C Con n ector
If 0/11 operation is desired. connect a key to the KEY ja ck.
2.7 EXTERNAL SPEAKER AND
HEADPHONES
Receive audio output from the TS - 820 is 1.5 watt at 4 to 16
ohms . The TS- 820 has a built- in speaker. However. if an
external spea
ker is desired for fixed st ation or mobile opera·
tion. simply connect it to the SPEAKER jack on the real pa·
nel. The speaker may be any good a ohm permanent ma -
gnet type in the 4 il}ch or large size. The internal speaker is
disconnected when an external speaker is used.
Headphones should also be a
ohms im pedance. When the
headp ho nes are connected to the fro nt panel PHONES jack
the speaker is disabled.
2.8 RTTY (FS K)
For RTTY operation. connect a teletypewriter to the RTIY
KEY jack on the rear of the transceiver. Since this jack is
connected
to the switching circuit for shifting frequencies. a
re lay should be inserted in t he closed loop of the teletypew-
riter for keying operation .
2.9 GROUND
So preventing to re ceive an electric shock. TVI and SCI,
sel ect a good . effective gro und for installat io n and then con·
nect an earthing wire to the backside of GN D terminal . Use
a heavy earth
line as big as possible. it is because short-line
wiring is regarded as most effective f or operation.
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ANTENNA
@ @ 0
ANT
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HE AO P HO NE
HS· 4
VF0-820
0.
0 0
PH ONE
PA TCH
TTY
CLOSED
LOO P
EXTERNAL
SP EAKER
Fig. 1(a) Connection
IM PO RT A NT ·W nen w1ring a new power pl ug.
conlirm lllat the p1 n nu mbering on t ne new plug
15 1den t 1c al to t he pin nu mbenng on tile POWER
connec tor. Tile transoe•ver can be damaged by
mcorr eor pin wiring.
120 /220 VAC --- -+---+
12 0/220 VAC
DC 13 . 8V-
w
(f)
::>
u...
AC OPERATION
DC O PE RA TION
Fig. 1(b) Po we r Plug Wiring
l
seen frorn the cord.
Mtcroph
one
Fig. 2 . M icrophone Connection Wiring
7

MI Cr QJ.1hO n I ?
De 9 SWII('\1
Mar ching lranslormer
(a) Unsuilable for Pn operat i on.
Micropho ne
I
De g
6
{b) Unsuitab le
fo r PTT opera t io n ?
SW ! IC11
M>cropllo ne
i
D €?
g
f)
(c) Suilable f or PTT operation .
~ Sw1I CI1
Fig. 3 A Suitable PTT M i crophone
9 P MT SHORT PLUG
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~
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EXT VFO
::;.
:>
@ @
Fig. 4 Back Pane l Jumpered EXT VFO Connection
8
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~ SECTION 3. OPERATING CONTROLS i
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Fr ont View Panel
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3.1 FRONT PANEL CONTROLS
G) METER
T he meter mon i to rs.six different funct ions. depending on
the position
of th e METER switch. In rece iv e the meter is
automatica l ly an S-mete r. The S-meter shows re ceived si -
gnal strength on a scale of 0 to 40 db over S9 . In transmit
the meter fu nction depends on the posi tion of the METER
switch. as described below .
@ METER SW IT CH
The position of the METER sw i tch determines the function
of the meter . The switch selects one of th e following func-
tions (see Section 4 for nom inal meter readings):
ALC
IP
RF:
(Automatic Level Control) - In this posi tio n the
meter monito rs the ALC voltage of the internal
ALC circu it (or the ALC vo lt age feed back f rom a
li
near amplifier operated in conjunct ion with the
TS ~ 820). For SSB operation the ALC reading for
vo ice peaks should be within the i ndicat ed ALC
range of the meter . The ALC voltage adj ustment
is made with t he MIC control for SSB a nd with
the CAR co n. tro l for CW .
(Plate Current) -In t
hi s position the mete r moni -
to rs the plate current of the final tubes. T he me·
ter scale is calibrated from 0 to 350 ma.
(Ou tp ut Power) - In th is position the meter mo-
nit ors the re lat ive output powe r of the transcei-
ver. There is no meter scale for this position.
Normal ly the reading should be adjusted with t he
RF VOLT control for a 2/3 scale meter reading.
COMP: This indicates the state of compression when the
speech processor is operated.
HV: (High Vo ltage) - In this positio n the meter mo ni-
tors the h igh voltage f rom the power supply. The
meter scale is calibrated f rom 0 to 1 0. indicating
0 to 1 000 volts .
@ ATT INDICATOR
Th1s indicator uses a l ight emi tti ng diod e. It is illuminated
when the RF ATT switch is turned to ON.
@ FIX (F IXED CHANNE L OPERATION)
INDI CA TOR
The FIX indicat or is a l ightemitti ng diode wh ich illuminates
whenever the TS-8 20 's i nternal f ixed frequency oscillator is
controlli
ng the tra ns ceiver's operation
10
@ VFO INDI CATOR
The VFO indicato r is a iight em i tting diode wh i ch illuminates
whenever the TS-820's internal VFO is contro lling the tr ans-
ceiver's operation. The indicator is not lighted during fixed
channel.
or remote VFO, operation .
@ RIT INDIC ATOR
This light emitti ng diode is illuminated when the RI T circuit
is turned on, showing that the transmit and receive frequen-
cies ma 'y be diffe r ent .
(]) SU B-D IAL
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 dir ect reading of frequencies
over t
he range of 0 to 500 kHz graduated at 1 kHz inter-
vals. Operating frequency can be obtained by adding the
frequency read
on the dial to the frequ ency (MHz) indicated ·
on the BAND sw itch.
@ DIAL CA LIBRAT E KNOB
This knob is used to calib rate th e reading on the dial scal e.
It should not be used for tuning purposes.
@) MAIN TUNIG KNO B
This knob turns the VFO and dial scale to select the fre·
quency to be added· to the band freq uency to establish the
t
ra nsceiver's operating frequency.
@ STAND -B Y SWI TCH
This two position lever switc h selects one of the f ollow ing
fu nctions :
REC:
SE ND :
The transceiver is rece1v1
ng un less the micro -
phone PTT sw it ch is switched to t ra nsmi t. or the
VOX circuit is act i vate d.
The
TS-820 is'locked into the transmit mode in
this switc h posi tion .
-, ___ -- __ ____ __, __

@ VOX SWITCH
This two - position lever switch selects one of the following
functions.
MAN:
VOX:
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.
With the
switch in this position . the VOX circuit is
turned on for voice operated , transmit on SSB se-
m
i-automatic break-in operation on CW.
@ NB SWITCH
The NB switch turns the built-in noise bla nker circuit on and
off. The noise blanker is designed
to reduce pulsating igni-
tion type noises. When the l ever switch is flipped up. the
cir
cuit is turned on.
@ MONI (MONITOR) SWITCH
This sw it ch is used to demodulate part of the output of the
transmit IF amp l ifier for monitoring transmit signals.
@) AGC SWITCH
The AGC switch controls the AGC (Automat ic Gain Control)
Ci rCuit giving the operator three choices:
OFF:
FAST:
It may be des irab le to turn the AGC off when re-
ceiving a very weak signal.
The FAST AGC
posi tion is designed for use in CW
operation .
SLOW : Use the SLOW AGC position for SSB ope r ation .
@ PHONES JACK
T he headphones jack allows use of a 4 to 16 ohm set of
headphones with a 1/ 4" phone pl ug attached. When the
phones are pl ugged into the transceiver. the speaker is dis-
connected.
@ MIC CONNECTOR
The microphone connector is four pronged . allow i ng use of
the PTT microphone . Fi gure 2 shows how to w ire the P!ug
on the microphone cable.
@) MODE SWITCH
The MODE switch is used for selection of type of waves or
for TUNE operation.
TUN;
CW :
USB :
LSB·
FSK:
Used for
adjustment of transmit c onditions . The
input power to the final stage is low as compared
with that for CW so that the final stage tube,s 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 .
Used for CW operation .
Used
for USB operation . It is i nternat ion ally de-
termined
that the 14. 21 and 28 MHz bands be-
long to USB.
Used for LSB operation . It is i nternat ionally de-
termined that the 3.5 and 7 M Hz bands belong to
LSB.
For RT TY ope r ation with teletypewriter .
@ COMP LEVEL KNOB
Pull this knob during SSB operation . The speech processor
is activated and t
he talk - power is increased. Adjust the
state o( compression by turning the knob whi le observi ng
. the COMP meter.
@ DELAY KNOB
The DELAY control adjusts the holding time of the VOX cir-
cu it for VOX or break -i n CW operation . The control wi ll have
to be adjusted to the pref erence of the individual operator.
@ ANTI VOX KNOB
This control adjusts the level of the anti VOX s1gnal fed in to
the VOX c
ir c uit . Adjust the contro l to prevent feedback of
the speaker from tripping the VOX circuit.
@ VOX GAIN KNOB
This control adjusts the sensitivity of the VOX circuit by ad-
justing the gain of the VOX amplif ier. for voice contro lled
operat ion.
@ RF AIT SWITCH ·
Wi th this switch set to ON. ATT {attenuator) of about 20 dB
is connected to the antenna ci rcuit . pr otecting the RF ampli-
fier and mixer circuit fr om strong i nput signals.
@ RIT SWITCH
This is the sw itch for the RIT {receiver incremental tuning)
circuit. To turn
on the circuit. press this switch : to turn off.
press it once again. The RIT mdicator is illuminated when
tt
·-·· -- ·- ·· -·- - _../

111e RI T circui1 is ON. By turning the RIT knob. the receive
frequency
of VFO can be changed by ± 3 kHz a nd the Ire-
fluency
of fixed channel by ±1 50 Hz wi thout changi ng the
tr
ansmit fr equency .
@ BAND SWITCH
This 11 -p o sit ion switch selects all the necessary circ ui ts to
tune the transceiver
to th e desired 5 00 k Hz ba nd .
@ FUNCTION SWITCH
This 7 -posit ion r otar y sw itch selec ts one of the fo llo wi ng
transceive f unct io ns .
CA L-
FIX:
CA L-
RM T:
This posi tion a ll ow s calibr at ion of the T S-8 20 's
internal VFO
to one of the t ra nsceiver's fixed fre-
quency chan ne ls (i f an optio nal fixed channel cry-
stal is
insta ll ed). Wit h t he sw itch in this position a
signal is genera te d at th e selected fixed channel
frequ ency and the main tuning knob can be tu ned
to zero be
at th e ca lib ratin g signa l.
This posi t io n allows calib ratio n of th e VF0 - 82 0
(remote VFO} to the transceiver's ope rating fre-
quency. With the switc h in this pos iti on. the
transceiver generates a calibrating
sig n al and the
VFO-8 20 can be tuned to zero -beat the calibra-
ting signa l.
CAL- With the sw itch in this po sition. the t ra nsceiver's
25 kH
z: calibrat or ci rc u it genera te s a marker sig nal at
every 25 kHz for normal
calib r atio n of the i nt ernal
VFO.
V
FO : The sw itch is k ept in th is po sition fo r normal
transceive ope ra tion.
VFO.R: Wi th t he sw itch 1n this posi tion. th e TS- 820 's in-
ternal VFO co n trols the receive fu ncti on and the
i nt ernal fixed channel os cillat or c on trols t he tra ns ·
mi t fun ctio n (i f fixed channel c ry stals are insta ll ed
in rhe osci ll ator).
F
IX .R:
FIX:
12
W ith th e s wi t ch in thi s pos ition. the TS -8 20' s in·
ternal VFO con trols the t ra nsm it fu nctio n a nd th e
built-in fixed channel osc illat or con tr ols the r e·
ceive function (if fixed ch annel crystals are in st al-
led in the oscillator}. The VFO.R a
nd FI X.R a llow
cross-cha nnel ope ration wit ho ut an ext ernal VFO.
Wit h the sw it ch in th is pos it ion. th e TS -820 's
fixed chan nel osci llat or co ntrols t he tr an smit and
receive fu
nct ion of t he tr ansceiver (i f accessory
--'------------ --· · -· -- -------- --- - -
fixed channel crystals are installed in th e tr_ an scei·
ver}.
@ H. SW (HEATER) SWITCH
This sw itc h turns the he a te r ci rcu its of the three transmi tting
tubes on and o ff . The heaters would norma ll y be t urne d to
OFF to reduce po we r co ns ump ti on in mobile or portable re-
ceivin g.
@ PO WER SWITCH
The POW ER sw itch t urn s a ll the pow er on and o ff in t he
TS-820.
@ RtT KNOB
This knob is used to chan ge receive frequency w hen the RIT
ci rcuit is in ope ra tion. Set t he cent er position (0} of the
RI T k no b to the RIT-OFF.
@ IF SHIFT KNOB
By u si ng this kn ob dur in g r ecep tion. the center frequency of
the IF crystal filte r can be shifted by ±1.7 kH z. facili ta tin g
the adju
stme nt of the tonal qua lity of receive si gnal or e lim i·
nating rad io inte rf erence fr om nearby frequencies. For no r-
m al operation. this kno b should be set to the cent er position
(click is heard).
@ MIC GAIN KNOB
This knob is used f or adj us tm ent of the gain of MIC am plif ier
d unn g SSB ope r at ion. Adj us t so t hat the meter poin te r does
no t deflect beyond the ALC zo ne.
@ CAR (CARRIER) LEVEL KNOB
Used to a dj us t carrier level du ring CW oper at io n. A djus t so
that th e mete r does not deflec t b ey ond the ALC zo ne .
@ AF GAIN KNOB
Th is knob a dj us ts the gain of the receiving a udio amplifier.
The audio
volume of the received signal in cre ases as the
con trol is turned cl ockwise .
@ RF GAIN KNOB
This con trol adjusts th e gain of the receiversectio n's RF am-
plif ier. Turn t he k no b fully clo ckw ise for maxim um gain a nd
f or a co rrect S-mete r read ing . Turn th e cont rol counter --
cl ockw ise to reduce the gain.
FIX CH (FIXED CHANNEL) SELECT SWITCH
Thrs four- posit ion ro ta ry sw itc h selects between four di ff e-
rent fixed frequen cy channels wh i ch can be in st alled inside
.. ~--- · ·-------- -'

0.
the transceiver. Fixed frequency operation is conve nient for
operation
on often used frequencies. The fixed channel os-
cillator replaces the VFO when th e FUNCTION switch is pla-
ced in the FIX posi tion .
@ DRI VE KNOB
The DR I VE tuning contro l tunes the plate tank cir cuit of the
12BY7A
driver as well as receiver's antenna and mixer
coils. In receive the DRIVE contro l is tuned for maximum
sensitiv ity (maximu m S- meter deflect ion). In trans mit the
DRIVE
control is tuned for a maximum ALC reading. When
the cont r ol is correct ly tuned for transmission it will be cor -
rectly tuned for
reception .
@ PLATE KNOB
The PLATE con trol adjusts t11 e plate tuni ng of the two final
amplifier
tubes .
Rear Panel View
@ LOAD KNOB
The LOAD co ntrol adj usts the loading of the pi -circ uit bet -
ween the fi nal section and the antenna. The control is ad just
as described in Section 4 for impedance matching .
@> DH { DISP LA Y HOLD) SWITCH
(WHEN THE DISPLAY DG -1 IS USED .)
With t his switch set to ON. the frequency below 1 00k Hz on
the display dial remains on even
when the main dial knob is
rotated. This feature
is useful to m emor ize the original Ire·
quency
wh en checking other frequencies. The DH switc h
being ON
turns off the l ights fo!. "MHz" frequencies. elimina-
ti ng a worry about mi$-reading frequencies.
13
- ·· -- '

t
•'
3.2 RE AR PANE L CONTRO LS
G) RF VOLT
Use the RF VO LT control to adjust the sensit ivity of the RF
outp ut function of the meter Adjust it f or a 2/ 3 scale rea-
ding during CW transmission.
@ COOLING FAN
This fan c ool s the RF amplifi er sec tio n of the TS- 820 to in-
sure reliable and efficient operation.
@ ANTENNA CONNECTOR
This S0 - 239 co ax co nnect or sho uld be attached to a suita-
ble antenna for tran smi t llng and receivin g. See Section 2.4
for a discussion of an appropriate antenna.
@ BIAS CONTROL
The BI AS control adjusts the bias voltage of the t wo
S200 1A (61 468 ) amplifier tubes. Tuning the control clock-
wise increases the idling plate current of the tubes. Sect ion
4 describes adjustment of the bi as current.
@ SG SWITCH
The SG slide switch co ntr ols th e screen grid voltage on the
final tube s. For tuning or n eu tralizing th e TS-820 you can
set the s wit ch to the OFF position . Tu rn the switc h back to
the ON position f or no rma l op era tion . The SG voltage is on
when the s wit ch is up and off when the switch is down.
@ TR ANSVERTER IN JACK
This is the RF input jack for inp ut from a VHF transverter.
(]) TRA NS VERTER OUT JACK
Th is is the low level RF o ut put jack for use wit h a VHF trans-
verier .
@ GND(GROUND) L UG
To prevent accidental shocks from the chassis. as we ll as in-
terference. con nec t a good ear th ground to this lug .
@ FUSE
This fuse is a 3AG, 4 amp fuse which p rot ects the power
supply of the transmitter against short circuits. Never use a
higher amperage fuse than
th e one specified. An impro per
one can cause ex tensi ve damage to the transmitter. When
the
fu se blow s o ut , try to deter mine the cause before repla-
cing it .
14
VVnen the posruon of the AC Voltage Selector Sw itch is
changed.
it is also necessary to change the power fuse. For
1 20 volt operation a 6 ampere fuse. for 220 v ol t ope ration a
4 ampere fuse provrded
with the TS-820 should be used.
@) . AC VOLTAGE SELECT SWITCH
T hi s slide s wit ch sw it ches the primary of the power transfor-
mer to select 120 or 220 VAC operation.
@ POWER SUPPLY CONNECTOR
This 12-pin connect or is used to co nnect an AC or DC po we r
source to the transceiver.
@ TRA NSVE RTER CONNECTOR
T his 12-pin connector is used to contro l an acces sory VHF
transverter.
PIN
F UNC T ION PIN
FUNC T ION
1
ALC
I 7
Transverter in
2 Occ up oed as termmal 8
Norma ll y closed
relay con t act
3 . ..
210 voc
9
Ground
4 No conncc11o n
10 +210 voc
5 - 1 00 VDC
, 1 No
connection
6 Transvcrter in
12 Gro und
@ X VERTER SW I TCH
Whe n VHF Tr ansverter (TV- 502) is connected to the trans-
ceiver, the selection of HF or VHF is automatically accom-
plished by se tti ng the transv er ter swit ch to ON or OFF.
@ PHONE PA TCH IN JACK
Th is is a phone pat<;h input terminal for transmission of
SSTV or other line inputs.
@ PHONE PATCH OUT JACK
This is a line o ut put term inal for phone patc h or recording. It
is al so used f or connection to the in put of FSK demodulat or
SSTV.
@ SPEAKER J ACK
The receiver audio output can be connected through this
jack
to the external 4 to 16 ohm speaker. The intern al
speaker is disc onnected when an external speaker is con·
nected.
-- - -- · ----- --- ·- ---- - ·- . -- .. ·- ·- --- --- ·--- ·-

@ EXTERNA L VFO CONNECTOR
This 9-pin connector provides a mea ns of in terconnecting
the KENWOOD VF0-820. another external VFO. or an ex·
ternal receiver. The interconnecting cable is provided with
the VF0-820 . The 9-pin jumpered VFO plug provided with
the TS-820 must be inserted in this sock et for normal trans-
ceiver operation.
PIN
FUNCTION PIN
FUNCTION
1
VFO s1gna l 6
Calibrator signal
{9 VOCI
2
VFO signal shield 7 No
co nn ection
3
Ground
8 9
VOC to intern<JI
VFO (pin 9)
4 12 .6 VAC 9 9
VO C to exte rnal
VFO
5 Relay
voltag e
(+ on tr ansmi t)
@) REMOTE CO NN ECTOR
Th e REMOTE connector is an 8-pin socket for use in i nter·
connecting a linear amplifier. an external speaker. or another
accessory
item . (See Fi g. 301
PIN
FU NCTION
PIN
FUNCTION
1
Grou nd 5
Normally open
rel;~y contact
2
No connection
6
ALC feedback
3 Norm<JIIy
closed
.,
Occup1 ed as terminal
relay con tact
4 Gr oun d B
Ex 1ernal speaker
@ IF OUT JACK
Receive signals from the final IF stage are supplred to this
jack for monitoring waveforms of opposite stations.
@ CW KEY JACK
Connect a key to this 1/ 4" phone jack for CW operation.
@ RTTY KEY JACK
This is used tor FSK operation. A 2 P plug should be inserted
for connection
to the S\Vitch ing circuit of a teletypewr i ter .
@ DC-DC CONVERTER CONNECTING HOLE
DC-DC.Converter (DS-1. optiont can be wired through this
hole For
wiring . remove the cover plate.
Remove sc r Qw and
stopper plate Sw
ilch stopprr
to opposite s1de Lock lev
er l> y a lt aching
stopper plate 10 oppos ite
s1 de screw
120V
1 20V
1
220V
!>topper plate
c -r --.,
,I .
~ : 0:
,, .
,_,
120V
220V
Fig. 5 Changing Power Voltage from . 220V to 120V
15

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; 5
I SECTION 4. OPERATING INSTRUCTIONS I
~llll l • t• ll t • ft U it•t l l lt+ •I I IU"' I Ift ll•t "ll l•t"I IIU ••I UIJ •i tfUt ·fii iii•I N. t•l lllh • of1 11t• III II"'' IUI 1oiltl1.,!llll1 •tl tii• • •IH it •tHIU•tlfllt • t lll ll• + lll lt •tii RI •tiii .. • 1141U •n ttiJ •I MI I1"'IIIJI• MI U t•tMUI•UIIIh U itU•i ll .l•ti i iii•UIItt•t iii U•II I11 "' tt U. t•o "t• l ..,ltl l -·l .... l•tUf11•111 11F
4.1 PRELIMINARY PROCEDURE
•
Set the MIC and CA R controls to zero and the MODE s witc h
to LSB, USB, or CW to pr event acci dental transmtt c on-
ditions before tuni ng . The T S-820 must be operated i nto a
50 ~ 75 ohm antenna or dummy load with an S WR less
than 2 : 1. Random l
ength w ire 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 a ll of the required cabling, as described
in Section 2.3
~ 2.8 .
With a suitable antenna and microphone (or key) connected
to the t ra nsceiver, set the TS- 820 switc hes to posi ti ons des-
cribed in Table 1.
4 .2 ·RECEIVER TUNING
Refer to Table 1 for the init ial switch se tti ngs of the TS-820
for rec eiving . and then continue with th e desc ri bed proce-
dure.
16
TABLE 1. Initial Switch Settings f or · Receiving
CONTROL LOCATION CONTROL
FRONT P
ANEL CONTROLS BAND Swit ch
POWER S wit ch
H. SW Swi tch
Stand-by Switch
NB Switc h
RIT
Switch
RF ATT
FUN CT I ON Switch
AGC Switch
MODE Swi tch
PLA TE K no b ·
DRIVE
Knob
RIT Knob
AF
GA IN Kn ob
IF SHIFT Knob
RF GAIN Knob
RE AR PANEL CONTROLS EXT VFO Con ne c to r
SG Switch
X VERTER Switch
The re main i ng co nt rols do not affe ct reception so they may
be in any posi tio n.
Push the P OW ER swit ch on. The meter, dial scale, and VFO
indicat or will light. indicating that the transceiver is opera-
ti ng . The receiver section is fully solid- state allowing recep·
tion with the H. SW switch turned to OFF. Adva nce 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 unt il a signal is heard.
Tune the
signal f or the clear est possible reception. and then
adj
us t the DRIVE con tro l for max i mum deflectictn of the S --
meter.
The
RF GA IN control varies the AGC feedback voltage which
effects the S- meter reading. With t he RF GA IN control fully
clockwise . the S·meter gives a proper signal strength rea-
di ng . Tuning the control counter - clock~ise reduces the RF
GA IN , reducing signal stre n gt h and band noise.
4.3 READING THE OPERATING
FREQUENCY
The fr equ ency di al of TS- 820 ind icates accurate carrier
positions regardless of operating modes because of the use
of a special circuit system. th us the transmit a nd receive fre-
quency can·be directly read on the dia l. except for CW recep-
tion in wh ich case the frequency on the dial is l owe r by the
beat frequency than the receive frequency.
When the dig ital disp lay DG-1 (opt ion) is used.
If t_here is any difference betwee n the frequencies on the dial
POSITION
Desired band
OF.F
OF F
REC
OFF
OFF
OFF
VFO
SLOW or FAST
To the approp riat e si deban d or CW
M idd le of the ra ng e for t ~e band
Ce n tered
Ce ntered
Fu ll y counter-clockwise
Centered
Ful ly clo ckwis e
The
jum pered plug must be in this socket
ON !up pos it i on )
O FF
.I
I
-· - • .. --- · . - ----- - ., _ _;._ _ _!

scale and the digital dial (option). the correct frequen cy is on
the digital dia l. In this case. the analog dial should be ca li -
brated w ith the c alibrate knob .
NOTE : When the digital display is used. the dig its for
10 MHz order change according to Ihe BAND switch and
are
independent of the counter unit . In the 29 .5 MHz band.
for example. the indical ion "29 . 999 . 9" is followed by
" 20.000 . 0" .
@
3;:£ 11
0 0
0
cg
:3BB
0 0
0
D•al Reod•ng 177 kHz
Th e operat ing frequen cy of the transceiver is the sum of the band
lrequency and dial readi ng frequency .
fxa mple Band sw11 ch 14 MHz
Op er ating Frequency: 1 4000 + 1 77 ~ 1 4177 kHz
Fig . 6 Re ading the Operating Frequenc y
4.4 CALIBRATING THE FREQUENCIES
To read frequenc1es correctly from the dial scale, tlie dia l
must be ca li brated previously using a 25 kHz marker. To ca-
librate . set the FUNCTION switch to CAL - 25kHz and the
RIT switch to OFF Turning the RF ATT switch to ON redu·
ces the i ncom i ng signal and the marker signa l can be recei-
ved more easily. Detai l ed method of calibration is describ ed
below .
sse
Set the MODE switch to USB or LSB. Marker signal s are re-
ce ived 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
tun .ing knob so that a beat signal can be received at every
25kHz . Tu rning this knob further will cause the beat signal
to vary from high to low tone and finally become a zero
beat. Accurate z ero beat point is obtained by turning the IF
SHIFT knob in the .. - .. direction (for USB). and m lhe ..· I- ..
dire ction (for LSB). Stop turning the knob at the zero beai
point and rotate the dia l calibrate knob alone while holdi ng
the main tuning knob until the dial pointer indicates 0, 25.
50 or 75 on the dial.
The dia l cal ibrate knob is forced against the main tun ing
knob by mean s of a spring permit slip rotation with ease.
cw
Se t the IF SHIFT knob to its center position . If CW filter is
not used. obtain a zero beat poi nt of marker s1gnal and turn
the main tuning l<nob count er-cloc l<wise until a beat signa!
of about BOO Hz is received. yYhile holding the main tuning
knob . turn the dial calibrate knob so . that the dial po inter in-
dicates the correct position on the dial.
When CW fi lter is used. turn Ihe d1al when the marker signal
casues maximum deflection on the S meter and then cali-
brate using the d ial pointer. In this case. the beat frequenc y
is about 800Hz !CW filter YG·BBC is optional extra).
CALIBRATING THE FI XED CHANNEL AND
VFO FREQUENCIES
Frxed channe l and VFO frequencies can be cal ibrated at the
CAL-F IX position of the FUNCTION s witch Set the swi t ch
ro the CAL -FIX position and turn the VFO main tuni ng kno b
until a beat signal is received in the vicinity of fixed channe l
frequency . Calibration is effected at the zero beat posit ion .
CALIBRATING THE TS - 820WITH VF0-820
Turn the FUNCTION switch to CAL - RMT to calibr ate thE
TS-820 with the VF0-820 . a receiver. or another remotF.
VFO. Tune the remote VFO to the frequency sel ected on thE ·
TS- 820 and zero beat the generated markec signal. At z er c
beat. tlie TS-820 and remo te VFO frequencies coincide
By calibrating the TS- 820 for normal operation. as describec'
previousl y. the TS- 820 can be used as a frequency standaro
for cali brating the remot e VFO.
4.5 RF GAIN
RF GAIN is controlled by changing the voltage of the AG C
circu.it. Adjusl the RF ·GAIN k nob so that the S meter doe ~ ·
not c·ause excessive deflection . This minimizes the noise du ·
ring reception and allows the S meter to indicate the cor~ec ~
s igna l s trength . F or normal operation. this knob should bf.
turned fully cl ockwise for maximum sensi tivity.
17

4 .6 RF ATT
If the transceiver is operated in a short - dista nce (wi t hin
several hundred meters) and strong signals of near by fre·
quencies are received. the wanted signals are blocked . Also.
if the wanted signals are very strong. the S meter is scaled
out. In
th is instance. set the ATT switch to ON. The input
signals to the RF amplifie r are atte n uated by about 20 dB .
providing distortio nless rec~ptio n .
4 .7 RIT
By using the RIT knob . the receive frequency of VFO can be
shifted by about ±3 kHz and the frequency
of fixed channel
by
about ±1 50 Hz without changing the transmit fre-
quency. If the frequency of the opposite station is deviated.
your receive frequency can be set
to the stati on by turning
the RIT sw i tch to ON and using the RIT knob . The state of.
RIT can be checked bh the indicator in the window of the
d1al.
4.8 IF SHIFT
By using the IF SHI FT knob during reception. the pass band
fr
equency of the crystal filter can be shifted by about
±1. 7kHz because of adoption of PLL (Phase L oc ked L oop)
circu it in the local oscil lato r circuit . This is one of the major
features of TS- ·820 and can be used in the f ollowing cases:
1. Adjustment of Tonal Quality and Interference Rejection
during SS8 Reception.
When the transceiver is used in USB mode, turn the IF
SHI
FT knob in the "+" direc t ion and the l ower frequen-
cies are cut out. Turning the knob in the " -" direct ion
cuts out the h igher frequencies (these procedures are
reversed for LSB mode).
Adjust the knob so that the to·
nal quality su its you r listening preference. The IF SHIF T
knob is also effective in eliminati ng interference w hen
the receive signals are superposed on nearby signals.
2.
Adjustment of Tonal Quality du ri ng CW Operation
For detailed descriptions. refer to Sect ion 4.1 3 "CW
ope r ation ".
3. FSK (RTTY) Oper at ion at 850Hz Shift
For detailed descri ptions . refer to Section 4.19 "RT TY
operation".
4 .9 · NOISE BLANKER
The TS-820 has a sophisticated built-in no ise blanker
designed
to reduce i ngit ion typ e impulse noise. The noise
blanker IS
part icularly importa nt for mobile ope ra tion. Whe n
necessary, activate the
no ise blanker circuit by fli pping the
NB switc h up.
18
4.10 AGC (A UTOM A TIC GAIN CONTROL)
Set the AGC switc h to the position appropriate for the
rece1ved signal. Generally for SSB re c eption set.the AGC
sw it ch to SL OW . for CW reception set the AGC switc h to
FAST. and for reception of a very weak signal the sw itch
may be set to OFF.
4.11 TRANSMITTER TUNING
Connect the TS--820 to a 50 ohm dummy load or a 50 ohm
antenna wit h an SWR of less than 2 : 1 before making any
tmnsmitter adjustments. The life of the final tubes is directly
r elated to the SWR of the anten na and to the len gth of tu-
ni ng periods .
Refer
to Table 2 for the ini tial switch settings of the TS- 820
for transm itt ing. Tune t he main tuni ng knob to th e desired
operating frequency.
PL ATE IDLING CURRENT (See Fig. 7)
T um t he 1 nain tuning knob to the desired operating fre- ·
que ncy wtth in the amateur band selected. Flip the stand-by
switch to SEND and check that the plate current (IP) is 60
ma. If the plate cu rrent is no t correct. adjust the re ar panel
BIAS conrrol for a correct 60 ma of idling current and r et urn
the stand-by switch to REC .
CA UTION : If tile plate curren t is very much higller than 60
ma do not leave the stand-by switch on for mo re than a few
seconds. Excessive plate cur r ent sho rtens the life of the fi-
nal tubes.
DRI VE TUNING (See Fig. 81
Shift the METER switch to ALC and the MODE switc h to
TUN and peak the ALC reading (maximum meter deflectio n)
with t he DRIVE control. The stand-by sw itch is in the SE ND
posit ion for adjustment .
NOTE : If there is no ALC reading indicated, increase the
CAR
control u nt il there is an ALC reading.
PLATE TUNING {See Fig. 8)
Turn the METER
swit ch back to IP, leave the MODE sw itch
at
TUN and flip th e stand-by sw itch to SEN D. Quic kly adjust
the PLATE control to dip the plate current (a minim um mete r
reading). Return t
he stand-by sw it ch to REC.
NOTE : The TUNE position perm its tuni ng of the final tank
circuit at reduced power without danger to the tubes. Wit h
the
MODE switch in the T UN posit ion, the screen vo ltage of
the finals is
red uced to approximately 50% and the keying
circuit is shorted.

Table 2. Initial Switch Settings for Transmission
(The controls not described should be set as described in Table 1)
LOCATION CONTROL
FRON T PANEL CONTROLS - BAND Switch
POWER Switch
H. SW Switch
Stand·bY Switch
MODE Switch
VOX Switch
MON I Switch
MIC Control
CAR Control
METER Switch
PLATE Co nt rol
DRIVE Control
FUNCTION
Sw itch
RIT Switch
REAR PANEL CONTROLS SG S wit ch
EXT VFO Connector
T
ABLE 3. Summery of Transmitter Tun ing Procedures
MODE Switch
USB Ot LSB
TU N
TUN
cw
MOOE
US S~ r L SS
,00~ . " "
FRONT PANEL
METER Switch Stand·bv Switch
IP
ALC
IP
RF
METE
RF
I P'
1
rcoMP
"' . ~
SEND
SEND
SNED
SEND
Fig. 7 Adjustment of the Plate Idling Current
POSITION
Desired band
ON
ON
REC
USB or LSB depending on selected band
MAN
OFF
Fully counter-clockwtse
Centered
lp
Mi ddle of the range for the band
Centered
VFO
OFF
UP (ON)
Jumpered pl ug 1nserted
Procedur e
Adjust BIAS control for 60 ma.
Peak the ALC reading wilh the DRIVE control.
Dip p l at~ current with PLATE contro l.
Peak RF outpu t by al ternat ety adjusting th e
PLATE AND LOAD contro l s.
IP
• Ad jUSI n\QI)( POll\I
PLATE ad,ustment angular u•splacc mc nt
(a) IP
• Ad1u st mcnt po111t
ALC
DR IV E adru stmcnt angular d1sp l acem<.:lll
(b) ALC
Fig. 8 Plate and Drive Tuning
19