Trio TS-530SP Manuel utilisateur

TF?IO TS-530SP

HF TFIANSCEIVEFI

INSTRUCTION

MANUAL

This instruction manual covers TS-S3OSP and TS-S3OD. lf

instructions differ from each other, thoae are mentioned

separately.

Please refer to an instruction corresponding to your type of

transceiver.

AFTER

UNPACKING

Savethe original

boxespacking

in the event your unit WARNING:

needsto be transportedfor remote operation,mainten- Personal

injury

may

occur

- do

notdisregard.

ance,

orservice.

Thefollowing

explicitdefinitions

applyinthismanual.

Be CAUTIoN:

.@__-

sureto read

thesedefinitions:

NOTE:

lfdisregarded,

inconvenience

only

- no

damage

person- WARNINC

alinjury.

Read

OperatingManual

Section4. before

placing

trd|3rnrner,n

servrce.

HIGH

VOLTAGES

PRESENT.

CAUTION:

Equipment

damagemay

occur.butnotpersonal

injury.

SPEC|FICAT|ONS........... 3 4.3 Transmission

(t)

SECTION1.INTRODUCTION

ANDFEATURES........

4 (1)SSBOperation

SECTfON2.fNSTALIAT|ON........... 5 4.4 Transmission

(il)

2.1 Unpacking (1) Speech

processor

2.2 OperatingLocation (2) VOX

(Voice

OperatedTransmit)

Operatron

2.3 Cabling (3) XIT(Transmitter

Incremental

Tuning)

2.4 Microphone (4) CWOperation

2.5 Key 4.5 DigitalDisplay

Calibration

2.6 External

speaker

and

Headphones 4.6 Analog

Dialcalibration

2.7 Ground sEcrtoN

oprtoNALAccEssoRtEs............

.......

2.8 Antenna 5.1 OptionalAccessories

SECTION3. CONTROLS

AND THEIRFUNCTIONS. 8 5.2 Installation

Accessories

3.1 FrontPanel SECTION6.

MAINTENANcEANDALIGNMENT....2S

3.2 RearPanel 6.1 General

SECTION4. OPERATION............. .........

14 6.2 Service

Position

4.1 Reception

(l) 6.3 Receiver

Adjustments

(1) BasicProcedures

for Receive

Operation 6.4 Transmitter

Adjustments

(2) WWV Reception 6.5 Transmitting

onWARCBANDS

4.2 Reception(ll) 6.6 Operation

on22OYACoT24OVAC(USA)

(1) NOTCHCONTROL SECTTON7.TROUELESHOOTTNG ........

(2)

RFATTSwitch BLOCKDIAGRAM... ...........29

(3)

RFGainControl |NTERNALV|EW............. ........................

(4)

AGC

(Automatic

GainControl) SCHEMATICDIAGRAM ........................

(5)

RrT/XrT

(6)

Shift

(7) NARROW

Switch

(8) NoiseBlanker

(NB)

CONTENTS

TS-53OSPECIFICATIONS

[GENERAL]

Frequency

Range.......... 160mBand 1.8

'- 2.0MHz

8Om Band 3.5 - 4.0MHz

40 mBand 7.0- 7.3MHz

30mBand

10.1

- 10.1

5MHz

(1O.0

MHzWWV)

20 mBand

14.O

- 14.35

MHz

17mBand18.068

- 18.168

MHz

5 mBand

21.O

- 21

.45MHz

12m Band

24.89

- 24.99

MHz

1Om Band28.O

- 29.7MHz

SSB/CW

Within'l kHzduring

thefirst

hourafter

1minuteofwarmup.

Within100 Hzduringany30 minute

period

thereafter.

0VAC/1

20VAC|240VAC,

50/60 Hz

Transmit:

295 watts

Receive:

27 watts (withheatersoff)

333

(13.3)x

133

(5.3)x

333

(13.3)

(inch)

12.8kg

(28.2

lbs)

Modes.........

FrequencyStability

......

PowerRequirement

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

Power

Consumption

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

Dimensions

Weight........

[TRANSMITTER]

* FinalPower

Input.........

Audio

Input

lmpedance

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

Output lmpedance..

CarrierSuppression

Sideband

Suppression

Spurious

Radiation....

Harmonic

Radiation

AudioFreq.Response..............

ALCInput

LinearAmp RelayContact

Ratin9..........

IRECETVERI

ReceiverSensitivity

lmageRatio............

lF Rejection

Receiver

Selectivity

ssB/cw.....

Notch-filter Attenuation

AudioOutput lmpedance

AudioOutput

NOTE:

The circuitand ratings

technology.

TS-53OD

160W PEPforSSB

operation

13OW

DCforCWoperation

500p - 50 kjz

50Q - 75r/

Betterthan

40 dB

Better

than50 dB

Betterthan60 dB

Betterthan

40 dB

4OOto 2,600

Hz.

within

-6 dB

-1OV

DCMax

100vDc1A

O.25

at10dBS

+N/N

Betterthan6O

Betterthan70 dB

2.4kHz

(-6 dB),

4.2kHz

(-60 dB)

CWOptional

Filter

YK-88C5OO

(-6 dB),

1.5kHz

(-60 dB)

YK-88CN

27OHz

(-6

dB),

1.1kHz

(-60

dB)

SSBOptional

Filter

YK-88SN1.8

kHz

(-6

dB),3.3

kHz

(-60

dB)

Betterthan

20dB

.5kHz)

8 - 16(2

1.5W

(8l2)

may be changed

without noticedueto developments

TS_530SP

22OWPEP

for

SSB

operation

18OWDC

for

CWoperation

SECTION

1.INTRODUCTIONAND

FEATURES

1.1KENWOOD

TS-530

TheTS-530 is highlysophisticatedsolidstateAmateur

band

transceiver

employingonlythree

vacuumtubes.

Operating

on all Amateurbandsbetween1.8 and 29.7

MHz,

this unit is constructed

modularly.

TheTS-530 in-

cludesmany built-infeaturesusuallyfound as extrason

other transceivers.Included

are VOX. 25 kHz calibrator,

RlT, RF attenuator,

and an effective noise blanker. The

TS-530also

includes

automatic

gain

control

(AGC),

auto-

maticlevelcontrol(ALC),

semi-break-inCWwith sidetone,

aspeech

processor,

speakerand

built-inACpower

supply.

Any complicated electronic device will be damaged if

operated

incorrectly.

and

thistransceiver

isnoexception.

Pleasereadallof the operatinginstructions

before

putting

your

TS-530 onthe air.

1.2FEATURES

1. Interference-free

DXoperation

* TUNABLENOTCH

FILTER

Interferenceis reducedor eliminatedusing

thebuilt-in

notchcircuit.TheTS-53OusesanAudionotchfilter.

' lFshiftcircuit

The lF SHIFTis a circuit to shift lF pass-bandwidth

without changing

receivefrequency. lt eliminates

in-

terferenceor adjustsreceivefrequency

characteristic

asdesired.

* NARROW/WIDE

BAND

WIDTHselectionandoptional

filtersfor enhanced

operation.

NARROW or WIDE

CW operationcanbe selectedwhen usingoneof two

optional

filters:

YK-88C

(5OO

Hz)or YK-88CN

l27OHzl

NARROWor WIDE SSB operation can be selected

whenusing

theoptionalYK-88SN

(1.8

kHzlfilter.

2. WARC

bands

The TS-53O fully covers the 16O-1Om

Amateur

bands,

including

thenewWARC

bandsof 1O.

18 and

245 MHz. The

VFOcoversat least5OkHzabove

and

beloweach50OkHzband. Theoptional

VFO-230ex-

ternal

digital

VFOcoversabout 1OO

kHzabove

and

beloweach

band,

forMARSand

otherapplications.

3. All-in-one,compact

ACPowersupply.

4. Advanced circuit design for improved two-signal

characteristics.Cleverly

designed

front-end circuit

componentsand receivecircuit systemassureexcel-

lenttwo-signalcharacteristics.

Cross-modulation

and

blockingarereduced.

5. TXfinalunituses61468's/S2OO1A.

The final transmittingtubesare: two 61468's two

6146B's,61468's/S2OO/AS

for the TS-530SP;on

S2OO1

A fortheTS-530D.

AmplifiedALC provides

clear,strong signals

with re-

ducedcross

modulation.

6. Variable

levelnoise

blanker

Conventional

fixed

levelnoise

blankersare

sometimes

lessthan effectivein removingpulsatingnoiseover

weak signals

or rejecting

strong interference

signals.

This

variablelevel

noiseblanker

isequipped

to control

theoptimum

threshold

levelof the gate

pulse

ampli-

fier.

7. Thespeech

processor

controlsthe audiocompression

level

and ALC time constant to increasethe average

audio

levelandtransmitpower.

8. XIT(Transmit

lncrementalTuning)for fine adjustment

of transmit frequency independentof receive fre-

quency.

9. Built-in

digitaldisplay

Displays

accuratefrequenciesto the 1OOHz order,

anybandor mode.

1O.The controlsarearrangedon the zincdie-castfront

panel

for easyoperation.

11. A fullvariety

of accessory

circuitsareprovided:

TheTS-530includes:

VOX circuit (available

for Semi-Break

in),Markercir-

cuit,side-tone

oscillator,selectable

AGC(OFF.

FAST,

SLOW) RF Attenuator. CW zero-beatcircuit (in the

Tune position), HEATER switch. SCREEN GRID

switch,andbuilt-in

speaker.

SECTION

2.INSTALLATION

2.1 UNPACKING

Remove

theTS-530

fromits

shippingcontainer

and

pack-

ing material

and examineit for visibledamage. lf the

equipmenthasbeendamaged

inshipment,notifythe trans-

portation company immediately.

Save the boxes and

packing

material

forfuture

shippingormoving.

The followingaccessories

shouldbe included

with the

tranceiver.

1. Instruction

Manual

(850-4076-OO)

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

2. Plastic

ExtensionFeet

withScrews

(JO2-0049-14)

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

3. SpeakerPlug1/8"

(E1

2-OO01-05)

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

4. 7P

DINPlug

(E07-0751

-O5) ..........

5. Fuse

TS-S3OSP

(USA)

12OV 64.............1

r POWER

CONNECTIONS

Make

surethePOWER

switchonthefrontpanel

isturned

off,thestand-byswitchisintheREC

position,

andtheline

voltage

iscorrect.Then

connectthe POWER

cordto the

line

source.

r AC POWER TS-530SP

For

fixedstationoperation,the unitoperatesfrom 120V

AC (U.S.A.)

or 22OV AC|24OVAC (Europe),

5O/6OHz

power

sourcecapable

ofsupplying280 watts

ormore.

. 120V

AClinemodel

(U.S.A.)

A 64 fuseisused.

lf you desireoperation

on 22OV

AC or 24OV

AC,it is

necessaryto changethe power transformer

connec-

tions

andthe

fuse.

See

page

27.

. 12O|22OVACline

model

Thisversionis

equippedwith avoltage

selector

switch

on the rear

panel.

Setthe switchto yourline

voltage

andusethe correctfuse. 120V settingrequires

a 6,4

fuse.22OV

setting

requires

a44 fuse.

. 22O|24OVACline

model

(Europe)

This

destinationtypeisequippedwith a voltage

selec-

torswitchontherear

oanel.

A 44 fuseshouldbeused.

Settheswitchto your

linevoltage

andusethecorrect

fuse.

NOTE:

o The22O|24OVAC

modelis

preset

to 22OY.

o The12O|22OVAC

modelis

preset

to 22OV.

TS-530D

Forfixed

stationoperation,theunit

operates

either

11O

22OVAC,50/60Hz

powersource.

Check

your

local

linevoltage

beforeoperation.

The11OVAC

settingrequires

64 fuse.

The22OVAC

settingrequires44 fuse.

Note:

TheTS-530D

preset

to 110V

AC.

TS-53OSP

TS-530D

220/240V

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

120l22OV

6/4A...1

each

11Ol22OV

6/4A...1

each

2.2 OPERATING LOCATION

As with anysolid

stateelectronic

equipment,

theTS-53O

should be kept from extremes

of heat and humiditv.

Choose

anoperatinglocation

thatisdryand

cool,and

avoid

operatingthetransceiver

indirectsunlight.

Also,allow

least

3 inches

clearance

between

the backof the equip-

ment to any object. This space

allowsan adequate

air

flow

fromtheventilating

fan

to keepthe

transceiver

cool.

CAUTION:

Donotoperatetheradio

inanRFField

greater

than

6V RF.

Receiver

damagemay

occur.

2.3 CABLING

(See

Figure

2-1.)

r GROUND

prevent

electricshock,

andreducethe

possivility

TVI

and

BCl,

connectthetransceiver

to a good

earth

ground

throughasshort

and

heavy

alead

possible.

Use

ground

rodsormetal

coldwaterfeedline.

NOTE:

A ground

connection

greater

than 1/4 ). awayfrom the

transceivermay be a good DC ground,

but NOTan RF

ground.

r ANTENNA

Connectthrough

a 50 ohm antennafeedlineto the coax-

ialconnector

ontherear

panel.

I KEY

lfCWoperationis

desired,connect

a keyto the KEY

jack.

Use

shieldedline

orcoaxialcable.

Headphones

Useheadphones

of 4 to 16O imPe-

dance.Theoptional

HS-4,

5, 6 or 7

headphones

bestsuited

for use

with

th€ TS-53O

Stereo-type

phones

can

also

beused.

Antenna

Surge

arrestor AL-2

Canbe used

for

TX monitor

Gl{D terminal

It is recommend€d

that aground lead

b€conn€cted

to the GND

terminal

the rearof the setto preventthe pos-

sibility

ofelectric

shock,

TVIandBCl.

Useas short and heavya leadasPos-

sible.

Microphone

Either

a low or high impedancemi-

crophone(5OOO

to 50 kO can be

used. The P.T.T.

switch should be

isolated

from th6 mic circuit

(shown

in "A"). Usea microphonewith ase-

oarate

switch and MIC line so both

P.T.T.

and

VOXareavailable.

,-<

n t--all E

r- o

trq

'^-ll

M'c'ooho.cl) P 9[

,--ll

| ^-tt 6-<

M,c,oeho..

u e____9ll

| -

I I'ansto'mc' O. --'

LinearamPlifier

MC-50

MC-60

External speaker

B€sides

the built-in speaker,

externalsDeaker

canalso

beused.

Connect to the rear EXT

SPjack usingthe supplied

ptu9.

sP-230

VFO-23O

vFo-2tto

\ t-::

Key

ForCW operation,

connect

Your

keY

to the KEY tack at the rear. Use

shielded

cable.

AC linesource

See

page5,AC POWER

Fig. 2-1 TS-530 Connections

Extemal VFO

2.4 MICROPHONE

Attach the microphone

connector

to a suitable

micro-

phone,

as shown in Figure

2-1

. Besure

the microphone

PTTswitch is separate

from the microphone

circuit,as

shown. lt should

be notedthat a microphone

with a 3P

plug

usingacommon

ground

terminal

should

notbeused.

Themicrophone

input

isdesigned

for 50OO- 50kOmi-

crophones.

The choiceof microphone

is important

for

good

speech

quality,

andshould

begiven

seriousconsidera-

tion. The

crystal

lattice

filterin

thetransceiver

provides

all

the restriction

necessary

on audio

response,

andfurther

restriction

inthe

microphone

not

required.

lt ismoreim-

portant

to haveamicrophone

withasmooth,

flatresponse

throughout

thespeech

range.

Follow the microohone

manufacturer's

instructions

for

connecting

themicrophone

cableto the plug.

With many

microphones,

thepush-to-talk

switch

mustbepressed

makemicrophone

audio

available.

For

VOXoperation,

this

unwanted

feature

maybeeliminated,

if.desired,

by open-

ing

themicrophone

case

and

permanently

connecting

the

contacts

whichcontrol

themicrophone

audio.

Standard

microphone

sensitivity

is within the range

-50 dB

to -60 dB.lfa

microphone

havinga

highersen-

sitivity

is used,

the ALC

andcompressor

circuits

will not

function

properly.

Inthiscase,

insert

inthe

mikelineanat-

tenuator

asshown

inFig.

2-1c.A typical

MIC

gain

control

setting

is 12 o'clock.

lf youmustrunthiscontrol

at I o'-

clock

orless,useanattenuator.

2.5KEY

lf CW operation

isdesired,

connect

a key

to theKEY

jack.

Use

shielded

cable,and

a standard

(mono

or 2P)

phone

plug.

2.6 EXTERNAL SPEAKER AND

HEADPHONES

Receive

audiooutput

fromthe

TS-530is 1.5wattsat4 to

16 ohms.TheTS-530 hasa built-in

speaker

jackon the

rearpanel.The speaker

may be an 8-ohm permanent-

magnet

type,

4 inches

or'larger.

The internalspeaker

disconnected

when an external

speaker

is used. Head-

phones should also be 4 to 'l

6 ohms impedance

greater.

When headphones

are connected

to the front-

panel

PHONES

jack,

thespeaker

isdisabled.

2.7GROUND

Toorevent

electricshock,

and

reduce

the

possibility

ofTVI

and BCl,connect

the transceiver

to a good

earth

ground

through

asshortand

heavya leadas

possible.

2.8 ANTENNA

Anyof thecommon

antenna

systems

designed

for useon

the high

frequencyamateur

bands

maybe used

with the

TS-530

provided

theinput

impgdance

ofthetransmission

line

notoutside

thecapability

ofthebi-output

m3tching

network.The transmission

lineshould

be coaxial

cable.

An antenna

system

which

showsastanding

wave

ratioof

lessthan2:1

when

using

5Oor

75 ohmcoaxial

transmis-

sion

line,orasystem

that

resultsin a

transmission

line

in-

put impedance

that is essentially

resistive,andbetween

15 and 2OOohms will take powerfrom the transceiver

with littledifficulty.

lf openwireof balanced

type trans-

mission

lineisused

with theantenna,

a suitable

antenna

tuner

with balun

isrecommended

between

the

transceiver

and

thefeedline.

Methods

of construction

andoperating

such

tunersaredescribed

in detail

in the ARRL

Antenna

Handbook,and

similar

publications.Foroperation

on the

160,75 and

4Ometer

bands,asimple

dipoleantenna,

cut

to resonance

in the most used

portion

of the bands,

will

perform

satisfactorily.

Foroperation

of thetransceiver

the 10, 15 and20 meterbands,theefficiency

of thesta-

tion will be greatly

increased

if a gooddirectional

rotary

antenna

isused.Remember

thateven

the mostpowerful

transceiver

isuseless

without

aproper

antenna.

CAUTION:

Protect

your Equipment-Use

a LIGHTING

ARRESTOR.

TheTRIO

AL-2is

recommended.

SECTION

3. CONTROLS

ANDTHEIR

FUNCTIONS

@ruorcurNcrcAToR

LED

@vro

rnotcnroR

leo

@enocrNDrcAToRLED

@nrarr rNDrcAToRLED

cnl

swrrcu

@ueren

@vox

swrcn

@vox

eru

@r.rsswtrcn

@ruelevelcorurnol

@lccswrrcn

@rueren

swrrcH

@srnruo-av

swtrcH

@vox

oruv

can

lrvel coNrRoL

@eHones.llcr

@vrrc

cor.rruecron

@uoor

swrrcH

@utcclr.rcoNTRoL

@ruan

@enocswrcu

DIGITALDISPLAY

ANALOGDIALSCALE

MAINTUNING

LOADCONTROL

PLATE

CONTROL

DRIVE

CONTROL

RIT/XIT

LED

RIT/XIT

CONTROL

@enruo

swrrcH

+0.5SWITCH

SHIFT

CONTROL

@ruorcu

/rrcH

xrTswlTcH

RrT

SWTTCH

@nrarr swrcn

Fig.3-1 Front PanelView

3.1 FRONTPANEL

Thesymbolafterthepartnameindicates:

Activeonlyduring

reception.

Activeonlyduringtransmission.

Nosymbol:

Alwaysactive

1. NOTCHTNDTCATORLED

Thisindicator,

(light

emittingdiode).

illuminates

whenthe

NOTCHcircuit

tumedON.

2. VFOINDICATOR

TheVFOindicatorilluminates

whentheinternalVFOcon-

trols transceiveroperation. The indicator is not lighted

duringfixedchannelorremote

VFO

operation.

3. PROC

(SPEECH

PROCESSOR)

TNDTCATOR

Thisindicator,

(light

emittingdiode),illuminateswhenthe

PROCswitchisturnedON.

4. RF

ATT TNDTCATOR

ThisilluminateswhentheRFATTisturned

ON.

s.cALswrTcH

(R)

This

switchenergizes

the

built-inmarkercircuit.

Receive

frequency

can be calibratedat 25 kHz intervals

usingthisoscillator.

6. METER

The metermonitorsfive different

functions,dependingon

METER

switch position. In receive

the meterisautomati-

callyan S-meter,andshows received

signalstrengthon a

scaleof O to 4O dB over 59. In transmit,meterfunction

depends on the position of the METER

switch, as de-

scribedbelow. This is an average-respondingmeter,NOT

peak.reading.

7. VOXSWTTCH

The VOX circuit is readied

for voiceoperated

transmit in

SSBor semi-break-inCW.

8. VOX GA|N O

This controls sensitivity of the VOX (Voice Operated

Transmit)circuit.

9. NBSWTTCH

With the pushswitch lN,the noiseblankercircuitturned

ONreducing

pulse-type

(ignition)

noise. Power-line,radat

QRMandatmospheric

"white" noiseswill not operatethe

blanker.Thenoise

blankercircuitoperatinglevel

isadjus-

tablebythe noiseblanker

control.

10. NBLEVELCONTROL@

This control adjusts the noise blanker circuit operation

level

according

to recoiving

conditionsor noiselevel.

11. AGC

SWTTCH

ThiscontrolstheAGC

(Automatic

GainControl)circuit:

OFF..............AGCdisabled

(no

AGC).

FAST

...........

Normally

used

for

CWoperation.

SlOW..........

Normallyused

forSSBoperation.

12. METERSWITCH

Thb determinesthetransmitmeter

function:

ALC(Automatic

LevelControl)

Monitors intemal ALC voltage, or the ALC voltage

fuedbackfrom a linear amplifieroperatedin conjunc-

tion with the TS-53O. For SSB operation the ALC

reading

for voice peaksshould be within the indicat-

ed ALC range. ALC voltageadjustment is made with

the MICcontrolfor SSBand with the CARcontrol for

cw.

(Plate

Current)

In this position th€ mster monitors final tube plate

current.Thescale

iscalibratedfromOto 350 ma.

(Output

Power)

This monitors relative output power of the trans-

ceiver.Thereis no meter scale

for this position. Nor-

mally the reading should be adjusted (with the RF

METERcontrol)fora2/3 scale

reading.

(High

Vohage)

This position monitors the high voltage pq,ver suf

ply. The meter scaleis calibrabd from O to 10, indi-

catingOto

lOOOvohs.

13. STAND-BYSWITCHC)

Thistwo-positionlever

switch selects:

REC......'.'.....The

transceiver

isreceiving

unless

themi-

crophone

PTT

switch,ortheVOXcircuit

activatd.

SEND

.'...'....'

Locks

theunit

intransmit.

14. VOXDEIAYCONTROLO

The DELAY control adjusts the hold time for VOX or

break-inCWoperation.

Adjustfor individual

preference.

15. CARLEVELCONTROLC)

This controls canier levelduring CW operation. Adjust the

CARlevelso that the ALC meterpoints to the centerof the

ALC zone. TheALC metershouldnot readbeyondthe ALC

zone.

16. PHONESJACKG)

The headphones

jack allowsuse of a 4 to 16 ohm or

greater

headphone

through a 1/4" phoneplug. When

phones

are

used

thespeaker

isdisconnected.

17. MrCCONNECTOR

Thefour pin connector

allows

useof a microphone

with

PTT

Figure

2-1Bshows

plug

wiring.

(Page

18. MODE

SWITCH

Themodeswitch

selects

typeofemission,

and

TUNE.

TUNE'.........'.

This position

provides

reduced

carrier

and

shorted

keyline

for transceiver

tuning.(ln-

put powerto the finalsectionis reduced

prevent

tubedamageduring

tune-up.)

Use

this position

to zero-beat

an incoming

signal.

CW..'............

Used

forCWoperation.

USB

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

Used

for upper-sideband

operation.

Inter-

national

Amateur practicedictatesthe use

ofUSB

onandabove

the1

4 MHzband.

LSB...............

Selects

lower-sideband.

International

Ama-

teurpractice

dictates

the useof LSBonand

below

the7 MHzband.

19. MrCGA|N

CONTROLO

This controladjusts

microphone

amplifier

gainfor SSB

operation. Adjust for an on-scale

ALC readingon voice

peaks.

20. NAR SWITCH @

With optional

filtersinstalled,

the lFbandwidth

canbe se-

lectedby the NarrowSwitch. The bandwidthvaries

with

filters beingused. Fordetails,

referto NarrowSwitch on

page

16.

21. PROC

(SPEECH

PROCESSORISWITCH

This switch is used

duringSSBoperation.Setthe switch

to the ONposition

andthe speech

processor

will beactiv-

ated,

increasing

theaverage

talkpower.

22. RFATTSWITCH @

With this switch ON, A 20 dB attenuator is in-

sertedin the antennacircuit,protectingthe RFamplifier

and

mixer

from overload

onstronginputsignals.

23. DIGITAL

DISPLAY

The digitaldisplay

indicates

operating

frequencyto the

nearest

1OO

Hz.

24. ANALOG

DIALSCALE

The mono-scale

permits

direct

analog

frequency

readout

overthe

Oto 5OO

kHz

range,

graduated

at 1-kHzintervals.

Opeating

frequencyequals

the

dial

(in

kHz)

plus

the

BAND

switch frequency

(in MHz). An additional

5O kHz both

aboveand

below

the5OO

kHz

rangeisalsocovered.

25. MAINTUNING

Thiscontrols

theVFO,

selecting

thetransceiver's

operat-

ingfrequency.

Theindented

knob

isconvenient

for quick

tunig.

26. LOADCONTROLO)

Thiscontrols

the loading

of the networkbetween

thefinal

section

and

theantenna.

Adjustment

isdescribed

inSec-

tion

27. PATECONTROL€)

Thiscontrols

the plate

tuningof the

finalamplifiers.

Cali-

bration

approximate.

28. DRIVE

CONTROL

Thiscontrol

tunes

theplate

tankcircuit

of the 12 B

Y 7A

driveras

wellas

thereceiver'santenna

and

mixercoils.ln

receive

theDRIVE

control

istuned

formaximumsensitivity

(maximum

S-meter

deflection),and

intransmit

fora maxi-

mum

ON-SCALE

ALC

reading.

These

points

occur

concur-

rently.

Tuningforonealso

achieves

theother.

29. RITD(IT

INDICATOR

Thisindicator

will lightwhentheRITswitch

orXIT

switch

isON.

30. RITD(ITCONTRL

This control allows the receivefrequency,

transmit fre-

quency

orbothtobeshifted

withoutusing

the

maintuning

control.

With theRIT

switch

ON,

theRITcircuit

isactivat-

edto shiftonlythereceive

frequency.

With the

XITswitchON.

the

XITcircuit

isactivated

toshift

only

thetransmit

frequency.

When both switches are ON,both frequencies

are shift-

ed.

The

center

(O)position

equals

noshift.

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