Lafayette Ha 73b cb walkie talkie User manual Schematic

7/21/2019 Lafayette Ha 73b cb walkie talkie User manual Schematic

1/7

RADIO

L

.a

f

aue

e

ELECTRONICS

J

. CORPORATION

Jericho Turnpike

Syosset, L.I.,

New York

11791

l K7

GK

Pri nted in

apa

n

afayette

........

-

. , 11

-

-

LAFAYETTE HA 73

Model HA-73B

CITIZENS BAND

uWALKIE TALKIE

2 CHANNELS

WITH

CAll AlERTTM.

(I

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para

6

es

~ . J El ectrICas e

; f i . " lect

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)

.

. I

4990 PONTf

DE

LIMA

STOCK NO. 99 32542L

;

OPERATING MANUAL


2/7

TECHNIC L

SPECIFIC TIONS

GENER L

FREQUENCY OF OPERATION .. Any 2 channels from channel 2-23 in

Your new Lafayette HA-73B is a compact hand-held unit designed for

27

MHz

CB

band. Plug-in crystals.

short-range two-way radio communication in the

27

MHz Citizens Band.

TRANSMITTER Crystal-con trolled . 100

mw input

Housed in a rugged metal case, the HA-73B comprises a fully miniaturized

power to

RF

STAGE. Meets FCC

transmitter

and receiver - both crystal controlled for precise, dependable

regulations

Part 15.

operation. Equipped with

7 transistors, the

unit

employs a sensitive

RECEIVER Crystal-controlled superheterodyne .

superheterodyne receiver circuit and a two-stage transmitter which TRANSMIT-RECEIVE

.

employs the audio section of the receiver for modulation purposes during

SWITCHING ......... .... ............. . Push-to-Talk method

transmission.

Other

receiver features include push pull audio for high

INTERMEDIATE

FREQ

.

output

and undistorted sound, and AGC

(automatic

gain control) to

(receiver) .... . .. 455 KHz

prevent overloading on strong signals and maintain uniform sound

output.

TRANSISTORS

Total

7

A call alert circuit

is

also incorporated to aid in establishing

POWER SUPPLY

9 Volt

communication with

other

units.

ACCESSORIES

Leather hand strap, Battery

(supplied)

The HA-73B may be operated

without

any license on channels 2

to

23 in

the Citizens Band, the

input

to the final

RF

stage being limited to 100

milliwatts as

prescribed in Part IS

of

FCC Regulations. Unless otherwise

ordered, the HA-73B is normally supplied with crystals for operation

on

channel 15. Additional matched pairs of crystals (transmit and receive) are

B TTERY

INST LL TION

available for operation

on

of

the

other

channels.

1. Remove the back cover of the unit (remove one large screw) exposing

should be treated with the care normally accorded to electronic

the battery compartment

in the lower section of

the

unit (See Fig.

I)

equipment. Always protect the unit against dirt and water. f the unit

is

treated with reasonable care, the only maintenance likely to

be

needed

to

Although built to withstand a certain amount of abuse, the HA-73B

9 VOLT

B TIERY

maintain

peak

performance

is

the replacement of the

battery

when

necessary .

.

.

1

SN

Fig. 1

2.

Attach the

snap

connector

to the 9 volt

battery

and place the

battery

in

position as shown.

r

3. Replace

the back cover and secure with screw.

IMPORTANT: Do

not

leave a battery in the HA-73B when the unit

is

not

used for long periods

of

time. This will avoid battery leakage and

possible damage to the unit.

2


3/7

gPER TING

INSTRUCTIONS

TELESCOPING

NTE

NN

AN

D

ER/MICROPHONE

SELECTOR

POWER JAC K

Wii n

1

Place call alert switch in NORM. position.

2. Extend the telescoping whip antenna to its fulllength . Avoid bending

the slim top section

of

the antenna when extending or collapsing it. To

extend the antenna, grasp the button-shaped tip and extend the

antenna partially. Next, grasp the center sections and extend the lower

sections fully. Extend the top sections by pulling gently on tip.

To collapse the antenna, grasp the center sections and collapse the

lower sections first, then the remainder, with the slim top section

pushed in by pressing on the tip with the index finger.

3. Turn volume control in an upward direction to switch unit on. Set the

channel selector to A and increase volume until background noise is

heard.

4. HA-73B

is

equipped with a combined speaker/microphone which is

located behind the grille

on

the unit.

To transmit, with the call alert switch in the NORM. position, hold the

unit so that the grille

is

3 to 4 inches away from

your

lips and fully

depress the push-to-talk button. Speak clearly and at a normal level.

3

When

you

have completed your message, release the

button.

NOTE: When one unit is transmitting, it is not possible for this unit to

hear any messages directed to it. Do no t , therefore, attempt to talk

until the other station has finished transmitting.

CALL

ALERT

Call alert should be used solely in establishing communication with other

units. The frequency of the built-in tone oscillator

is

factory adjusted to 2

KHz. To initiate a call, place the call alert switch in the CALL position

Depress the push-to-talk button for 1

or

2 seconds duration. Release

pressure on the push-to-talk button and return call alert switch

to

the

NORM. position. Wait for reply.

FAILURE TO RETURN CALL ALERT SWITCH TO THE NORM.

POSITION WILL PREVENT YOU FROM RECEIVING REPLY OR

FURTHER

CALLS

AS

THE RECEIVER

IS

INOPERATIVE WHEN

THE CALL ALERT SWITCH

IS IN

THE CALL POSITION .

CHANNEL SELECTOR

This switch enables you

to

select either of two frequencies of operation. In

one position, position A is selected; in the

other

position, B is selected.

The actual channels on which the unit is able to operate are determined by

the frequencies

of

the . crystals inserted in the unit.

As

mentioned

previously, most units are equipped with crystals for operation on channel

15 inserted in the A position.

If

you decide

to

insert additional crystals

for another channel, a record should be

kept of

the channel and its

corresponding position in the transceiver to avoid confusion when using

the channel selector switch.

OPER TING R NGE

The HA-73B has been factory-adjusted

to

provide optimum performance

within the power limits prescribed by the

FCC

for units

of

this type. Its

operating range will vary with surrounding conditions and will generally

fall into one

of

the following categories:

ADVERSE CONDITIONS (In or around buildings , with

poor

line-of.sight)

- Under such conditions range may be restricted

to

several hundred yards.

NORMAL CONDITIONS (Line-of-sight conditions, with few intervening

obstacles) - Range may extend up to 1 mile or more .

FAVORABLE CONDITIONS (Over flat terrain with no obstructions and

no interference or noise) - Range may extend up

to

several miles .

4


4/7

FREQUENCY

OF

OPER TION

TheHA-73B transceiver may be operated onchannels2to 23in the

27

MHz Citizens Band. Both receiverand transmitterare crystal-controlled,

and are normally equipped with channel 5 crystals unless otherwise

ordered. Additional matchedpairsof crystals(transmitand receive) may

be orderedforoperationon other channels.

Notethat thecrystalin thereceivingsection

of

theHA-73B is used for the

oscillator and

is

therefore

455

KHz lower than the actual frequency ':of

.)

peration. However , when ordering, you need only specify the stock

number

and channelforwhichcrystalsare required.

1

DDING NEW CH NNEL CRYSTALS

Toinse rt additional crystals in the transceiver, simply remove the back

cover(onelarge screw)and insertthe newcrystals in theplacesshownin

Figure2. .

IMPORTANT: Be sure to insert the receiving R) and transmitting(T)

crystals in their

proper

location.

If

their positions are reversed , the

HA-73B will transmit on onefrequencyandreceive onanother, both of

whichwill be outsidetheCitizensBand.

I

Crystal Arrangement

R:

Receiver

00 0 .:

Transmitler

A, B Chan nel

~

O [ o l ~ : 1 1

atte ry Insta Ia

tion

@ ;

< ID EI

l afayette

99.6 21

RC

A

VS323

urgess

2U6

o[

ATTERY

m

'

f

veready

216

JIS

006P

I

I

Fig.2

J

5

CRYST L CH RT

When ordering crystals, specify stock numbers (shown in listings in

Lafayettecatalogs)and channel onwhichoperation is desired.

CHANNEL

FREQUENCY

26.975

26.985

27.005

27.015

27 .025

27.035

27.055

27.065

27.075

27.085

27.105

CHANNEL

FREQUENCY

(Me)

27.115

27.125

27

. 135

27.155

17.165

27.175

27.185

27.205

27.215

27.225

27.255

U.S.

2

3

4

5

6

7

8

9

10

12

CANADA

1

2

3

4

5

6

7

8

9

U.S.

3

14

5

16

7

8

9

20

2

22

23*

CANADA

10

11

12

3

14

5

16

17

18

9

NOTE: Operation on channel 1

is

not

permittedunderPart 5

of

FCC

regulations.

*Channel 23 is shared withother RadioServices,includingClassC radio

control.

B TTERY REPLACEMENT

Any of the batterieslistedbelowby manufacturerand type numbermay

be usedif insertedintobattery compartment accordingtoinstructions:

MANUFACfURER 9VOLTDRY BATTERY

NEDA

1604

Eveready

216

Burgess 2U6

RCA

VS323

Lafayette

99-6021

I

i

6


5/7

OPERATION ON 117 VOLTS 50/60 Hz C

TheHA-73Bmaybe operated from 117 volts 50/60Hz

AC

whenused

with an

AC

adaptor (available as an optional accessory at extra cost).

Althoughthis restrictsmobility

to

acertain

extent

itdoesprovidebattery

conservation in those cases where one unit is used

as

abase station.The

HA-73B is equipped with aspecialjack at the side into which the AC

adaptorplug

is

insertedfor AC operation.

SERVICE

ND M INTEN NCE

f

trouble is experienced with

the

unit ,

we

recommend that

you

checkthe

followings:

1. Check battery for weak ordischarged condition. Replace ifnecessary.

2. Make sure the channelselector is set tothe positioninwhich crystals

have been inserted (The unit is normally supplied with crystals in

positionAonly).

3.

f

trouble is experienced with transmission, make sure

you

are

depressing the push-to-talk button fully. Also, the antenna must be

fullyex tended forproperoperation.

4. Make sure crystalsare firmly seated. Check thefrequencies orchannel

markings. Make sure crystals (T & Rj are inserted in their proper

positionsandnot reversed.

5.

f

checks above fail to disclosethe trouble,do not attempt repairsor

adjustments yourself. The unit should be serviced only by aqualified

radio technician.Whenever possible,

we

recommend that

you return

a

defectiveunit to the storefromwhichitwaspurchased.

I

f

7

RETURNING THE

UNIT

FOR SERVICE

In the event

that

repair

is

necessary [either

in

or out

of warranty]

we

recommend that

you

return the unit

to

the store from which it was

purchased. In most cases , this

will

be your fastest and most efficient

methodof obtainingservice.

If you wish to ship the unit to

instructionswhichfollow.

our mainservicecenter, please read the

SHIPPING INSTRUCTIONS

Pack the unit very carefully toavoid damagein transit, preferably

in

its

original carton. f the original carton is not available, use a sturdy carton

with at least3 inchesof shredded paperor excelsioraround theunit.In

thelatter case, wrap the unit iri paperfirst

to

avoid particles

of

packing

material gettinginto it. Include withtheun ita letterexplainingexactly

what difficulties

you

haveencountered [remember

to

addextraFirstClass

postage and indicate on theoutsideof the carton that First ClassMail is

enclosed]. Ship by prepaid express ifpossible and markELECTRONIC

EQUIPMENT-FRAGILE.Clearly addressthe carton as follows:

SERVICE DIVISION

LAFAYETTE RADIO ELECTRONICS CORP

150EngineersRoad

Hauppauge,L.I.,N.Y.,11787

8


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7/7

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