Kenwood TS-820 User Manual

OPERATING

MANUAL

CONTENTS

-3

TS-820 SPECIFICATIONS

SECTION 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 4.21 Operation with a Phone Patch

2.8 RTTY (FSK) 4.22 Use of Monitor Switch

2.9 Ground 4.23 Novice Operation

SECTION

3.1 Front Panel Controls

3.2 Rear Panel Controls 5.1 Block Diagram

SECTION

4.1 Preliminary Procedure

4.2 Receiver Tuning SECTION 6 MAINTENANCE AND ALIGNMENT.

4.3 Reading the Operating Frequency 6.1 General Information

4.4

4.5

4.6 RF ATT

4.7

4.8 IF Shift

4.9 Noise Blanker

4.10 AGC (Automatic Gain Control)

FEATURES

OPERATING

OPERATING INSTRUCTIONS 16

Calibrating the Frequencies RF GAIN

RIT

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....

CONTROLS

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TS-820 SECTION 5

SECTION 7

TOP and BOTTOM VIEW OF THE TS-820

SCHEMATIC DIAGRAM

Transmitter Tuning

SSB Operation CW Operation Operation with a Linear Amplifier Fixed Frequency Operation Internal Cross Channel Operation Mobile Operation

DX Operation (Use of Processor) RTTY Operation SSTV (Slow Scan

BLOCK

5.2 Board and Unit

5.3 Final Stage Power Amplifier

6.2 Accessories

6.3

6.4 Adjustment of Transmitter Section

DIAGRAM

CIRCUIT DESCRIPTION

Adjustment of Receiver Section

TROUBLESHOOTING

TV)

Operation

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24 25

40 42

t....

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TS-820 SPECIFICATION

.............................................

......%..............S

FREQUENCY RANGE

MODE POWER REQUIREMENTS

PLATE POWER INPUT

AUDIO INPUT IMPEDANCE AUDIO OUTPUT IMPEDANCE AUDIO OUTPUT

RF OUTPUT IMPEDANCE FREQUENCY STABILITY

AUDIO FREQUENCY RESPONSE CARRIER SUPPRESSION

SIDEBAND SUPPRESSION IMAGE RATIO

HARMONIC RADIATION Better than 40 db down from output signal

SPURIOUS RADIATION

IF REJECTION RECEIVER SENSITIVITY

=.RECEIVER SELECTIVITY

TUBE AND SEMICONDUCTOR

COMPLEMENT

DIMENSIONS

WEIGH 37.4 lbs.

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160 meter band

80 meter band 40 meter band 20 meter band

15 meter band 10 meter band - 28.00 to 28.50 MHz

1.80 to 2.00 MHz

3.50 to 4.00 MHz

7.00 to 7.30 MHz

14.00 to 14.35 MHz

21 .OO to 21.45 MHz

(A)

10 meter band - 28.50 to 29.00 MHz (E) 10 meter band - 29.00 to 29.50 MHz (Ci 10 meter band - 29.50 to 29.70 MHz (Dl

WWV

15.0 MHz (;eceive only)

USE. LSB, or CW. FSK

Receive

Trilnsmit

,20/220VAC,

200watls

160

wafts

100

watts

120/220

PEP

for

50/60

for

SSB

for

FSK

operation

VAC.

watts

waftslheaterr

280

waxti

operation

50/60

lheaterr

lmaximum!

operation

an!

off!

120walls

warts

wafts

13BV

DC PEP DC

for

operarion

for

FSK

06A

15A

SSB

operatian

operslion

operafion

DC'operslion

lheatersanl (heaters

lrnaxirnuml

off)

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

kHz during the first hour after 1 minute of warmup

400 to2600 Hz, within -6 db Carrier better than 40 db down from the output signal

Unwanted sideband is better than 50 dbdown from the output signal

Image frequency better than 60 db (50 db for 10 meter band) down from the

output signal

Better than 60 db down from output signal (without spurious radiation) IF frequency is 80 db or more down from output signal 025gVSf

N/N

10dbormore

SSB: 2.4 kHz bandwidth 1-13 db down)

4.4 kHz bandwidth

CW*: 0.5

1.8 kHz bandwidth

kHz bandwidth (-6 dbdown)

(with optional CW filter installed)

1-60 db down)

(-60 db down)

3 Tubes

IC's 30 FET's 74 Transistors

167 Diodes

13.2" wide x 5.9"high X 13.2" deep

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1. PLL System. HF Band SSB/CW/RTlY Transceiver

This transceiver employs newly developed PLL (Phase

Locked Loop) circuit. covering 1.8 to 29.7 MHr (WWV

MHz) for SSB, CW and RTTY ooerations.

2. Minimum Spurious and Excellent Overload

and Crossmod. Characteristic

The adoption of FET baianced type mixer. MOS FET and single conversion system minimizes spurious during transmission and assures excellent overload and

mod. characteristic during reception.

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 circuit". It allows you to eiiminate radio interference or quency characteristic to the desired bandwidth simply

by manipulating one control knob.

Built-in RF Processo~

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.

RF NFB

RF NFB from the transmit final stage

improves the cross modulation distortion. The use of

ampl~fication type ALC further improves the quality

the

of transmit signals.

Newly Designed Analog Dial

The combination of newly designed mono-scale and

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

tion of a circuit that is completely free from changes in

carrier frequencies permits accurate indication of fre-

quencies on one dial pointer.

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

and a stability for mobile operation. All the operating parts

such as control knobs and dials are designed and arranged according to human engineering technology to ensure maximum case of operation.

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

during transmission. which is normally impossible with

conventional transceivers. This

,888

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rlgid chassis, providing outstanding mechanical

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SECTION

,,,,

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sei the receive fre-

tothe driver stage

1s very useful when

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cross-

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FEATURES

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10. Build-in Fixed Channel Circuits with RIT

11. Transverter Connector

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

13. Wide Variety of Auxiliary Circuits

14.

,,,,

..,

,,,,

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checking the modulation condition or adjusting the processor.

Selector Switch for SSB/CW Receive

Frequency Response During CW reception the audio frequency response is

automatically narrowed

(crystals are optional) The

flxed channel circuits with RIT permit the use with

the built-in VFO for

Transverter operation. Changeover to HF or VHF is accomplished automatically with

Optional DC-DC Converter

DC-DC Converter DS-1

transceiver for

and Devices

The transceiver is completed with a noise blanker

circuit. VOX circuit, side tone circuit. marker circuit. built-in speaker. IF OUT terminal and linear terminal. The following devices are available as optional extra: Remote VFO Display (MC-50). Law Pass Filter (LF-30A).

Use of Digital Display Dial DG-1 (option) Digital Display Dial

The digital dial of TS-820 indicates transmit and receive

frequencies using carrier. VFO and local oscillator signals instead of converting VFO frequencies.

accurate frequencies can be read at all times at any band and any operating made. Since the accuracy of frequencies is set up

1 MHz standard oscillator, frequencies can be read accurately up to 100 with WWV. The green indication on the dial assures many hours Of fatigueless operation.

DH (display hold) Switch

By pressing the digital remains on, thus serving as a memory system.

TV-502 (2m) can be connected for ready

mob~le operatlon

(VFO-820). CW

IDG-1). Transverter (TV-502). Microphone

.,,,,,

,.,

,,,,

......................

to improve the clarity of sound.

more enjoyable operation.

the power switch of the transverter.

(optton) can be attached to the

3-position AGC switch. healer switch.

order by calibrating the 0S~illat0r

DH switch. the frequency read on the

....................

(YG-88C). Digitai

Filter

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anly

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Thus.

the

SECTION

2.1

UNPACKING

Remove the TS-820 from its shipping box and packing material and examine it for visible damage. 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 transceiver:

1 Operating Manual 1 Microphone Plug 1 Jumpered 9-pin Plug

5 RCA Phono Plugs

Alignment Tool

2 Plastic

4 Fuse

2.2

Extension Feet with Screws AC Power Cord Speaker Plug 8P US Plug

(6A x 2. 4A x 2)

OPERATION LOCATION

(~nstalled)

If the equipment

INSTALLATION

ve. and between 15 and 200 ohms wfll take ~ower from the transceiver with little difficulty. transmission line is used with the antenna. a suitable antenna tuner is recommended between the transceiver and the feed tuners are book. and similar publications. For operation on 75 and 40 meter bands. a simple dipole antenna. cut to resorlance in the most used portion of the bands. will perform rily For operation of the transceiver on the 10. 15. and 20 meter bands. the efficiency of the station will be greatly increased if a sood directional member that even the most powerful transceiver is useless without a proper antenna.

Mobile since any mobile antenna for use on the high frequency bands represents a number of compromises. Many amateurs lose the efficiency of their antenna through improper tuning. Remember the following points when using the TS-820 with a mobile antenna.

The possible, There are several commercial models available which use high

If openwire or balanced type

llne Methods of construction and operating such

descr~bed in detail in the ARRL Antenna Hand-

satisfacto-

Statlon - Mobile antenna installations are critical.

"Q"

of the antenna loading coil should be as high as

"0"

coils.

rotary antenna is used. Re-

As with any solid state electronic equipment the TS-820 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 and any object. This space allows an adequate air flow from the ventilating fan to keep the transceiver cool.

2.3

TS-820 is turned off, the stand-by switch is put in the REC position. and that the voltage switch on the back of the TS-820 is switched to the correct line voltage Connect the POWER cord to an appropriate external power source.

2.4

Connect a 50 - 75 ohms antenna connector on the rear panel.

Fixed Station gned for use on the high frequency amateur bands may be used with the transmission line is not outside the capability of the

put matching network. the coaxial cable type. An antenna system which shows a standing wave ratio of less than 2 ohm coaxial transmission line, or a system that results in a transmission line input impedance that is essentially

inches clearance between the back of the equipment

POWER CONNECTIONS

Make sure the POWER switch on the front panel of the

(1 20 or 220).

ANTENNA

feediine to the coaxial

Any of the common antenna systems desi-

TS-820. provided the input impedance of the

PI-out-

The transmission line should be of

when using 50 or 75

resisti-

The loading coil must be capable of handling the power of the transceiver without overheating. power output of the transceiver will exceed 80 watts.

The SWR bridge is a useful instrument, but unfortunately it is quite often misunderstood. and overrated in importance. Easically. the SWR bridge will indicate how closely the antenna load impedance matches the transmission line. With long transmission lines. such as will be used in many fixed station installations. it match fairly close in order to limit power loss. This is particularly true at the higher frequencies. The longer the and the higher the frequency, the more important SWR becomes However. in mobile installations the transmission line seldom exceeds 20 feet in length, and an SWR of even 4 to 1 adds very little power loss. The only rime SWR will indicate a low figure is when the antenna presents a load close the 50 ohms, but-many mobile antennas will have a

nmpedance as low as 15 or 20 ohms at their resonant

base frequency.

and yet the system will be radiating efficiently.

The really important factor in your mobile antenna is that is should be carefully tuned to resonance at the desired frequency. The fallacy in using an SWR bridge lies in the fact that it is sometimes possible to reduce the SWR reading by detuning the antenna. Field strength may actually be reduced in an effort to bring SWR down. Since field strength is the primary goal, we recommend a field strength meter for antenna tuning.

In such a case. SWR will indlcate 3 or 4 to 1.

isdesirable to keep the impedance

In the CW mode the

he.

For antenna adjustments. the 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 frequency. long at one time. Turn load. and get a field strength reading. Start out with the antenna whip at about the center of its adjustment range. Set the VFO to the desired operating frequency and then adjust the PLATE control for a dip. and then the LOAD control. Then observe the field strength reading. The field strength meter may be set on top of the dash, on the hood, or at an elevated location some distance from the car.

Change the whip length a half inch. or so at a time. retune the finals each time. and again check the field strength at the antenna. Continue this procedure until the point of maximum field strength is found. This adjustment will be most critical on 75 meters, somewhat less critical on 40. until on

10 meters the adjustment will be quite broad. After tuning the antenna to resonance. the finals can be loaded to full power.

In any case, do not leave the transmitter on for very

transceiver

on just long enough to tune and

may be loaded

The standard microphone sensitivity is within the range of

50 dB to -60 dB. If a microphone having a higher sensitivity is used. the ALC circuit will not function properly. this case, insert an attenuator as shown in the illustration at

right or connect a resistor with the capacitor 100 (X48-1150-00) of the transceiver.

MIC

2.6

KEY

operation isdesired, connect a key to the KEY jack.

2.7

EXTERNAL SPEAKER AND

(10k - 33k ohms) in parallel

pF (C94) in the IF unit

TS 820

MIC

Connector

HEADPHONES

2.5

MICROPHONE

Attach the microphone connector to a suitable microphone

as shown in Figure 2. 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.

The microphone input is designed for high impedance

ohms) microphones only. The choice of microphone is important for good speech quality. and should be given serious consideration. The crystal lattice filter in the transceiver provides all the restriction necessary on audio response. and further restriction in the microphone is not required.

more important to have a microphone with a smooth. flat re-

sponse throughout the speech range.

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

many microphones. the push-to-talk button must be pressed to make the microphone operative. For feature may be disabled. if desired. by opening the micro-

phone case and permanently connecting the contacts which

control the microphone.

Besure that the PTT switch of the mi-

(50k

It is

PTT operation. this

Receive audio output from the TS-820 is 1.5 wattat 4 to 16 ohms The TS-820 has a built-in speaker. However. if an external speaker is desired for fixed station or mobile operation.

Simply connect it to the SPEAKER jack on the real panel. The speaker may be any good 8 ohm permanent magnet type in the 4 inch or large sire. The internal speaker is

disconnected when an external speaker is used. Headphones should also be 8 ohms impedance. When the headphones are connected to the front panel PHONES jack the speaker is disabled.

2.8

RTTY

(FS

For RTTY operation. connect a teletypewriter to the RTTY

KEY jack on the rear of the transceiver. Since this jack is

connected to the switching circuit for shifting frequencies. relay should be inserted in the closed loop of the teletypewriter for keying operation.

2.9

GROUND

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

select a good. effective bround for installation and then con-

nect an earthing wire to the backside of GND terminal.

a heavy earth line as big as possible. it is because short-line

wiring is regarded as most effective for operation.

use

VFO-820

ANT

MICROPHONE

HEADPHONE

1 (a)

Fig.

Connection

EXTERNAL

SPEAKER

~~~SEo LOOP

IMPORTANT-When

conllrm

8dentcal conneotor. The moorreot

1201220

VAC

Fig.

lhat

p~n wiring.

l(bl

wlrlng a new power plug.

the

pn numberng

rhe

pn numberng

!ransoelver

Power Plug Wiring

,he

new

oan

AC OPERATION

\he POWER

be damaged by

plug

seen

Fig.

frorn

the

cord.

Microphone Connection Wiring

(a)

Unsunlable

for

PTT aperailan.

Mcroplions

(b) Unsuitable

(c)

Suitable

Fig.

for

PTT operation

lor

PTT

operation.

Suitable PTT Microphone

switch

Swllch

Back Panel Jurnpered

Fig.

EXT

VFO Connection

Front

View

Panel

SECTION

OPERATING CONTROLS

3.1

FRONT PANEL CONTROLS

VFO INDICATOR

METER

The meter monitors six different functions. depending on

the position of the METER switch. In receive the meter is automatically an S-meter. The S-meter shows received signal strength on a scale of the meter function depends on the position of the METER switch. as described below.

METER SWITCH

The position of the METER switch determines the function

of the meter. The switch selects one of the following functions (see Section 4 for nominal meter readings):

ALC

P (Plate Current) - In this position the meter moni-

(Automatic Level Control) 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-820). For SSB operation the ALC reading for voice peaks should be within the indicated ALC

range of is made with the MIC control for the CAR control for CW.

tors the plate current of the final tubes. The me-

ter scale is calibrated from

the meter. The ALC voltage adjustment

0 to 40 db over S9. In transmit

In this position the

SSB and with

0 to 350 ma.

The VFO indicator is a

whenever the TS-820's internal VFO is controlling the transceiver's operation. The indicator is not lighted during fixed channel. or remote VFO. operation.

This light emitting diode is illuminated when the RIT circuit

is turned on, showing that the transmit and receive frequen-

cies may be different.

SUB-DIAL

The sub-dial is turned with the main tuning knob to select

the operating frequency of the transceiver. 50 kHz intervals from 0 - 500 kHz.

DlAL SCALE

The unique mono-scale permits direct reading of frequencies

over the 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 frequency on the BAND switch.

DlAL CALIBRATE KNOB

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

It should not be used for tuning purposes.

light emitting diode which illuminates

It is calibrated at

(MHz) indicated

RF:

COMP:

HV:

Thls indicator uses a light emitting diode. It is illuminated when the RF ATT switch is turned to ON.

The FIX whenever the controlling the transceiver's operation.

(Output Power)

nitors the relative output power of the transceiver. There is no meter scale for this position.

Normally the reading should be adjusted with the

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

This indicates the state of compression when the

speech processor is operated.

(High Voltage) tors the high voltage from the power supply. The meter scale is calibrated from 0 to 1000 volts.

ATT INDICATOR SEND: The TS-820 is'locked into the transmit mode in

FIX (FIXED CHANNEL OPERATION) INDICATOR

ind~cator is a lightemitting diode which illuminates

TS-820's internal fixed frequency oscillator is

In this position the meter mo-

In this position the meter moni-

0 to 10. indicating

MAIN TUNlG KNOB

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

quency to be added to the band frequency to establish the

transceiver's

STAND-BY SWITCH

This two position lever switch selects one of the following

functions:

REC: The transceiver is receiving unless the micro-

operating frequency.

phone PTT switch is switched to transmit, or the VOX circuit is activated.

this

swttch position.

VOX SWITCH

This

two-position lever switch seiects one of the following

functions.

MAN:

VOX: With the switch in this position. the VOX circuit is

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.

turned on for voice operated transmit on SSB semi-automatic break-in operation on CW.

NB SWITCH

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 be protected against damage due lo overloading during adjustment. perative in the TUN mode. the be used for transmission or reception.

CW: Used for CW operation

USB: Used for

termined

long to

USE operation. It is internationally de-

Chat the

USE.

Since the KEY circuit is ino-

14.

transceaver cannot

and 28 MHz bands be-

tube,s can

The NB switch turns the built-in noise blankercircuit on and off. The noise blanker is designed to reduce pulsating ignition type c~rcuit is turned on.

This switch is used to demodulate part of the output of the transmit IF amplifier for monitoring transmit signals.

The AGC switch controls the AGC (Automatic Gain Control) c~rcuit giving the operator three choices:

OFF

FAST:

SLOW:

The headphones

headphones phones are plugged connected

nolses. When the lever switch is flipped up. the

MONl (MONITOR) SWITCH

AGC SWITCH

It may be

celv~ng a very weak s~gnal

The FAST AGC position is designed for use in CW operation.

Use the SLOW AGC position for SSB operation.

PHONES JACK

wlth a

desirable

jack allows use of a 4 to

1/4"

Into the

to turn the AGC off when re-

phone plug attached When the

transceiver.

the speaker 1s dls-

ohm set of

LSB Used for LSB operation. It is internationally de~

termined that the

LSB.

FSK:

Pull this knob during SSB 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.

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

This control adjusts the level of the anti VOX slgnal fed in to

the VOX circuit. Adjust the control to prevent feedback of

the speaker from tripping the VOX circuit.

This control adjusts justing the gain of the VOX amplifier. for voice controlled

operation.

For RTTY operation with teletypewriter

COMP LEVEL KNOB

DELAY KNOB

ANTI VOX KNOB

VOX GAIN KNOB

the sensitivity of the VOX circuit by ad-

3.5

and 7 MHz bands belong to

indtvidual operator.

MIC CONNECTOR

The microphone connector is four pronged. allowing use of

the PTT microphone. Figure 2 shows how to wire the

on the microphone cable,

MODE SWITCH

The MODE switch is used for selection of type of waves or

for TUNE

o~eration.

p!ug

ATT SWITCH.

With this switch set

is connected to the antenna circuit. protecting the RF ampli-

fier and

This is the switch for the RIT (receiver incremental ctrcuit. To turn on the circuit. press this switch: to turn off.

press it once again. The RIT indicator is

mixer

RIT SWITCH

to ON. ATT (attenuator) of about 20 dB

circuit from strong input signals.

tuning1

illumanated when

[he RIT circuit is ON. By turning the RIT knob, the receive

-1-3

frequency of VFO can be changed by

quency of fixed

transmit frequency.

channel by

-1-

150 Hz without changing the

kHz and the fre-

f~xed channel crystals are installed in the transceiver).

H. SW (HEATER) SWITCH

BAND SWITCH

This 1 1-position switch selects all the necessary circuits to tune the transceiver to the desired 500 kHz band.

FUNCTION SWITCH

This 7-position rotary switch selects one of the following Iransceive functions.

CAL-

FIX.

CAL-

RMT:

CAL- With the switch in this position. the transceiver's

25 kHz: calibrator circuit generates a marker signal at

VFO: The switch is kept in this position for normal

VFOR: With the switch in this position, the

This position allows internal VFO to one of the transceiver's fixed frequency channels (if an optional fixed channel crystal is installed). With the switch in this position a signal is generated at the selected fixed channel frequency and the main tuning knob can be tuned to zero beat the calibrating signal.

This position allows calibration of the VFO-820 (remote VFO) to the transceiver's operating frequency. With the switch in this position. the transceiver generates a VFO-820 can be tuned to zero-beat the calibrating signal.

every 25 VFO.

transceive operation.

ternal VFO controls the receive function and the

internal fixed channel oscillator controls the transmit function in the oscillator)

kHz for normal calibration of the internal

(if fixed channel crystals are installed

callbration of the TS-820's

calibrat~ng signal and the

TS-820's in-

This switch turns

tubes on and off. The heaters would normally be turned to OFF to reduce power ceiving.

POWER SWITCH

The POWER switch turns all the power on and off in the TS-820.

RIT KNOB

Th~s knob clrcujt is

RIT knob to the RIT OFF

IF SHIFT KNOB

By using this knob during reception. the center frequency of

the IF crystal filter can be shifted by the adjustment of the tonal quality of receive signal or natlng radio interference from nearby frequencies. For normal operation. this knob should be set to the center position (click is heard).

MIC GAlN KNOB

knob is used for adlustment of the galn of MIC ampltfler

This dur~ng

SSB

not deflect beyond the ALC zone

CAR (CARRIER) LEVEL KNOB

Used to adjust carrier level during CW operation. Adjust so

that the meter does not deflect beyond the ALC zone.

AF GAlN 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.

the heater circuits of the three transmitting

consumption in mobile or portable re-

used to change recelve

operatlon Set the center posltlon (0) of the

operatton Adlust so that the meter polnter does

frequency

i1.7 kHz. facilitating

when the RIT

elimi-

FIXR: With the switch in this position. the

ternal VFO controls the transmit function and the

built~in fixed channel oscillator controls the re-

(if fixed channel crystals are instal-

oscillator

controls the transmit and

FIX

ceive function led in the oscillator). The VFOR and cross-channel operation without an external VFO.

Wlth the swltch in this pos~tion. the TS-820's f~xed channel

recelve function of the transceiver (if accessory

TS-820's in-

FIXR allow

RF GAlN KNOB

This control adjusts the gain of the receiver section's RF amplifier. 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

Th~s four-position rotary switch selects between four diffe-

rent fixed frequency channels which can be installed inside

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

DRIVE KNOB

The DRIVE tuning control tunes the plate tank circuit of the

12BY7A driver as well as receiver's antenna and mixer

In receive the DRIVE control is tuned for maximum

coils. sensitivity

DRIVE control 1s tuned for a maximum ALC reading. When

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

rectly tuned for reception.

lmaximum S-meter deflection). In transmit the

PLATE KNOB

LOAD KNOB

The LOAD control adjusts the loading of the pi-circuit between the final section and the antenna. The control is adjust

as described in Section

DH (DISPLAY HOLD) SWITCH (WHEN THE DISPLAY

With this switch set to ON. the frequency below the display dial remains on even when the main dial knob is rotated. This feature is useful to memorize the original quency when checking other frequencies. The DH switch being ON turns

ting a worry about mis-reading frequencies.

off the liglits for

for impedance matching.

DG-l

IS USED.)

100

"MHz"

frequencies, elimina~

kHz on

fre~

The PLATE control adjusts ampl~fier tubes.

Rear Panel View

tlie plate tuning of the two final

3.2

REAR PAN EL CONTROLS

RFVOLl

Use the RF VOLT control to adjust the output function of the meter Adjust it for a 2/3 scale reading during CW transmission.

COOLING FAN

This fan cools the RF amplifier section of the sure reliable and efficient operation.

ANTENNA CONNECTOR

This

50-239 coax connector should be attached to a suitable antenna for transmitt~ng and receiving. See Section 2.4 for a discussion of an appropriate antenna.

BlAS CONTROL

BlAS control adjusts the bias voltage of the two

The S2001A 16146B) amplifier tubes. Tuning the control clockwise increases the idling plate current of the tubes. Section 4 describes adjustment of the bias current.

SG SWITCH

The SG slide switch controls the screen grid voltage on the final tubes. For tuning or neutralizing the TS-820 you can set the switch to the OFF position. Turn the switch back to the ON position for normal operation. The SG voltage when the switch is up and off when the switch is down.

TRANSVERTER IN JACK

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

TRANSVERTER OUT JACK

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

sensitivity

TS~820 to In-

of the RF

1s on

Wnen the position of the AC Voltage Selector changed. it is also necessary to change the power fuse. For

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

ampere fuse prov~ded with the TS-820 should be used.

VOLTAGE SELECT SWITCH

This

sldde switch switches the primary of the power transfor-

mer to select 120 or 220 VAC operation.

POWER SUPPLY CONNECTOR

This 12-pin connector is used to connect an AC or DC power source to the transceiver.

TRANSVERTER CONNECTOR

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

FUNCTION

t210

VDC

connectton

100

VDC

Tranrverter

VERTER SWITCH

When VHF Transverter

ceiver. the selection of HF or VHF is automatically accomplished by setting the transverter switch to ON or OFF.

PHONE PATCH IN JACK

This is a phone patch input terminal for transmission of SSTV or other line inputs.

JTV-502) is connected to the trans-

10 +210 11 12

Tranrverter

Normally closed

relay

Ground

No Ground

Sw~tch is

FUNCTION

contact

VDC

connection

GND

IGROUNDI LUG

Toprevent accidental shocks from the chassis. as well as interference. connect a good earth ground to this lug.

FUSE

This fuse is a 3AG. 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 replacing it.

amp fuse which protects the power

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.

SPEAKER JACK

The receiver audio output can be connected through this jack to the external 4 to 16 ohm speaker. The internal speaker is disconnected when an external speaker is con.

nected.

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