Telex Radiocom BTR-200 Series Service Manual

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Table

of

Contents

Page

Chapter

1

General Description

1-1

Specifications BTR-200

1-1

Controls and Connections 1-2

Front Panel 1-2 Rear Panel 1-5

Chapter

2 - IdentificationofCircuit

Board

Revision

and

Version

Audio Boards ......•.................................................................................................................................... 2-1

Receive Board 2-2

Transmit Board 2-3

Chapter

3 - Transmit, Receive & Audio Circuit Boards

BTR-200 InstrumentDisassembly 3-1 Transmit Board 3-2

Circuit Descdption 3-2 Alignment Procedure

: 3-2 Voltage Tables - TransmitBoard (878521) 3-3 PCB Transmit Assembly (878521-*)(palts List) ; 3-7

Receive Board 3-9

Circuit Descdption (PCB 70714000) 3-9 Circuit Descdption (PCB 750309)) 3-9 Alignment Procedure 3-10

Receive Board (70714000) 3-10 Equipment Required 3-10 Receive Board (750309) 3-11

Equipment Required 3-11 Voltage Tables - Receive Board (70714000) 3-14 Voltage Tables - Receive Board (750309) 3-15 PCB Receive Assembly 878522* (Parts List) 3-21 PCB Receive Assembly 878662* (Parts List) 3-24

Audio Board

,

::

3-27

Audio Board Circuit Description 3-27

Receive Expanders 3-27

MicrophoneAmplifier 3-27

Auxiliary Input Amplifier 3-27

Intercom Driver 3-27

Intercom Input. 3-28

Headset and Speaker Amplifiers 3-28

Transmit'Mixer and Filter 3-28

Auxiliary Output· 3-28

Remote Transmit Circuit 3-28

Power

Supply 3-28

Alignment Procedure 3-29

Equipment Required 3-29

-i-

Page

Chapter3·Transmit, Receive & Audio Circuit Boards (Continued)

Audio Board Continued

PCB Audio Assembly (878520) Versions 1 thru 6 (Parts List) 3-45

Display Board 3-48

PCB Display 878519 (Parts Lists) 3-48

List

of

Illustrations

Figure

1

2

3

4

5

6

7

8

9

10

II

12

13

14

15

16

17A

17B

18

19

20 21

22

23 24 25 26 27

28 29 30 31 32 33 34

Description Page

Headset XLR Connector Wiring 1-2 Front Panel-BTR200

1-3 Rear Panel - BTR-200 1-4 Location

of

Rev Level for Versions 1and 2 (Audio Board)

2-1 LocationofRev Level for Versions 3

thlU

6 (Audio Board)

2-1 LocationofRev Level for Versions I and 2 (Receive Board) 2-2 Location

of

Rev Level for Versions I and 2 (Transmit Board) 2-3

Exploded View - BTR-200 2-4 Transmit Board Component Layout (Foil Side) 3-4 Transmit Board Component Layout (Component Side) 3-4 Schematic Diagram Transmit Board - Version 1 3-5 Schematic Diagram Transmit Board - Version 2 3-6 Schematic Diagram Receive Board 3-16 Receive Board Component Layout (Component Side)

Versions

I and 2 (70714000) 3-17

Schematic Diagram Receive Board Version 2 (750309) 3-18 Receive Board Component Layout (Component Side) Version

1..

3-19 Receive Board Component Layout (Foil Side) 3-19 Receive Board Component Layout (Component Side) Version 2 (750309) 3-19 Schematic Diagram Receive Board Version

I (750309) 3-20

Block Diagram Versions 1 and 2 3-31 Block Diagram Versions 3

thlU

6 : 3-32 Audio Board Component Layout (Component Side) Versions land 2 3-33 Audio Board Component Layout (Foil Sde) 3-34 Schematic Diagram Audio Board Version

I 3-35

Schematic Diagram Audio Board Version 2 3-36 Details

of

Board Differences Between Versions I and 2 3-37

Details

of

Board DifferenceinVersions 3, 4,5,and 6 3-38

Audio Board Component Layout (Component Side) Version 6

with Detailed Areas Showing Differences ofVersions

3,4,5,

and 6 3-39

Audio Board Component Layout (Foil Side) Version 6 3-40 Schematic Diagram Audio Board Version 3 3-41 Schematic Diagram Audio Board Version 4 3-42 Schematic Diagram Audio Board Version 5 3-43 Schematic Diagram Audio Board Version 6 3-44 Display Board Component Layout (Foil Side) 3-48 Display Board Component Layout (Component Side) 3-48

-11-

CHAPTER 1

: -

')

GENERAL

DESCRIPTION

The BTR-200 is a base station which communi-

cates with up to four portable units simultaneously, in

full duplex.Itmay be used alone with a headset

or

interfaced

to

other

equipment

such

as a

hardwired intercom system.

n

1-1

CONTROLS

and

CONNECTIONS

FRONT

PANEL (Refer to Figure 2)

Power

ON/OFF

Switch: Push this switch once

to turn power ON; push it againtoturn the power OFF.

Power

ON

Indicator:

The Power ON Indicator is

illuminated when the Power

ON/OFF Switch is

pushed in the

ON

Position. It remains illuminated

while the Transceiver is on.

Local

Headset

Connector: 4 Pin XLR Connector for InputJOutput. The headset jack will accept 6 different Telex Model Headsets. Compatible with otherintercom headsets with four pin XLR connectors that are wired as shown in Figure

1.

MICROPHONE GROUND

BALANCED AUDIO OUT

MICROPHONE AUDIO

Figure 1

Headset

XLR

ConnectorWiring

1-2

Local Headset Volume: Adjusts volume

to

Local Headset. DOES NOT AFFECT MICROPHONE GAIN.

Mic

On-Push-to-Talk/Lock-to-Talk

Switch: Enables the local headset microphone audio function. NOTE: DOES NOT control base station RF transmit.

Local

Push-to-Talk

Indicator:

Will

be

il-

luminated whenever the talk function is on.

Local Microphone

Gain

Control

and

Overmodulation Indicator: A screwddver adjustable control is provided

to

control the input level ofthe

local headset mic. This input is protected

from overloads by means of a gain compressor whose operation

is

signaled by the gain LED indicator.

Portable

EnableSwitches

and

Indicators: When

in the

"IN"

position, the Enable switches allow the

user of the conesponding portable unit

to

be heard

by others connected

to

the system. Wheninthe

"OUT" position, the respective portable will

be

muted, but this portable will still be abletohear

all other selected remotes and interfaces. The indicators normally show the presence

of

a portable

transceiver in use

on

the channel corresponding

to

that indicator.

INTERCOM INDICATOR

27160-8-00I-A

LOCAL MIC OVE

RMODULATION

INDICATOR

LOCAL MIC GAIN CONTROL

LOCAL

PUSH-TO-TALK

INDICATOR

MIC

ON

PUSIH-lO-TALKI

LOCK-TO-TALK SWITCH

PORTABLE CARRIER INDICATORS

I

~OCAL

HEADSET VOLUME

I

i

AUXILIARY

ENABLE

INDICATOR

ENABLE SWITCHES

TO

RECEIVE

PORTABLE

TRANSMITTERS

I.-.--~

Portabte

Station

Connect--

AUXILIARY

LEVEL

CONTROL

AUXILIARY

ENABLE

SWITCH

INTERCOM LEVEL CONTROL

INTERCOM

ENABLE

SWITCH

POWER

ON

INDICATOR

Headset

8TR-200

1I

. LOCAL HEADSET CONNECTOR

Figure 2

Front

Panel-BTR200

1-3

27160-B-002-A

AUXILI

ARY

OUTPUT

CONNECTOR

RECEIVE ANTENNA CONNECTOR

A~'~

300

rnA

-------

POWER JACK

o

Power

SPEAKER GAIN CONTROL

TELEX

COMMUNICA

TtONS.

INC.

Fex

1.0.

850BTR-200

MADEINU.S.A.

Jack

CO

G~

LSpeaker-l

INTERCOM CONNECTORS

o

Intercom

Input

Transmit

1

TRANSMITTER

SWITCH

Headset

Mic

r"=-h

r~l

Oyn

fit

Cant

Off

Remote

HEADSET MIC

SELECT

SWITCH

AUXILJARY INPUT CONNECTOR

o

TRANSMITANTENNA CONNECTOR

Transmit

Anteflna

SPEAKER/LOCAL

MONITOR

(8nMIN.)

Figure 3

Rear

Panel BTR-200

1-4

Ext

Intercom Switch, Level Control,

and

In-

dicator: This switch enables the wired intercom interface when "IN", and disables it when "OUT". For

RTS

intercoms, the "IN" position is channel A and the "OUT" position ischannelB. Ascrewdriver adjustable control is provided to control the input

level

of

the wired intercom.

Auxiliary Audio

Enable

Switch, Level Control,

and

Indicator:

Theswitchenablesand disables the Auxiliary intelface when "IN" and "OUT", respectively. The functionofthe level control here is the same as that described for the intercom.

REAR

PANEL (Refer to Figure 3)

(j

Transmit

Antenna

Connector: Connect5/8-wave

antenna(supplied)

to

this connector. Antenna color

should match connector dot

on

BTR-200.

Receive

Antenna

Connector: Connect 5/S-wave

antenna (supplied)

to

this connector. Antennacolor

should match connector dot

on

BTR-200.

Transmit

Switch: Slide switch that allows the

operator

to

select oneofthree transmit modes.

In

the "OFF" position, the transmitter is always off.

This mode may be used

if

the base is functioning

solely

as

a monitor. In the "CONT" position, the transmitter is always on. This continuous mode is recommended over the "REMOTE" mode. In the

"REMOTE" position, the transmitter is enabled

only when one or more portables are active.

Headset Microphone Select Switch: This switch allows the user to select either

an

Electret

or Dynamic microphone. This switchi~factory preset to

DYN Position.

NOTE: All Telex headsets that are used with this intercom are dynamic type microphones.

Intercom

Connectors: Connections to interface

the BTR-200 with a wired intercom system.

Auxiliary

Output/Input

Connectors:

Can

be used for 2-way (four wire) input and output to the BTR-200 or as a simplex input or output. Typical usesare 4 wire low level intercoms, taperecorders, public address inputs or outputs, orwhen operating two BTR-200 units simultaneously.

Power

Jack:

Forexternal AC wall supply adaptor

(supplied) or any filtered 12 to 14

VDC/300 rnA

source, or 13.0

VAC

RMS/300 rnA source.

Speaker

Jack:

Allows the user to connect an ex-

ternal speaker

(8

ohms minimum)tothe unit.

Speaker

Gain

Control: Screwdriver adjustable. Adjust the gain control clockwise to increase speaker gain

or

counterclockwise

to

decrease

speaker gain.

NOTE: Leave setting counterclockwise

if

no

speaker is attached.

1-511-6

Blank

CHAPTER 2

IDENTIFICATION

OF

CIRCUIT BOARD

REVISION AND VERSION

Version 1 and 2 use Rev A circuit boards. The location for the Rev letteris shown below. Version 2 contains a small circuit board with a switch. See Figure 4.

AUDIO BOARDS

This board is installed in the holes for C124 and C125 (see below). Version 1 does not have this switchboard. For Rev C and higher, the location for the Rev letteris shown in Figure 5.

AUDIO BOARD

RECEIVE BOARD

LOCATION

OF

SWITCHBOARD

70723-000 REV A COMP

"'-.

••• _

r--------.

:I.

•

.2"!!2";!!.'!!!.I!.E!..~~_:

....

__

..

~---~_.:

o

Figure 4

Location

of

Rev Level for Versions 1

and

2

REV LEVEL LOCATED

.--

UNDER TRANSMIT BOARD

70723-000 REV C

AUDIO BOARD

c . .

a:

I U I

«

I

if

0

I 0 I

I 3 I

!Xl

I & I

l-

'"

I

:E

L_

en

z

«

a:

I-

U

I

Figure 5

LocationofRev Level for Versions 3

thru

6

2-1

Rev C boards can be either Verion 3 or 4. The differences are all parts values:

Rev D boards are all version 5. Rev

E boards are all version

6.

Rev B was not produced.

750309 COMP REV A

Version

RIOI

RI03

Rl25

Rl30

Rl31

Rl32

Rl33

Rl54

Rl62 Rl68

Rl70

Cl33

3

82K 82K

6.2K 1.5K

1.5K 1.5K

1.5K 5.6K

9.lK

68K

lO~F

4

200K

4.7K

4.7K 4.7K 4.7 8.2K 3.9K 15K 10K

22~F

RECEIVE

BOARD

The

BTR-200

uses oneoftwo receive boards.

Figure

6

LocationofRev Level

for

Versions 1

and

2

Early production units came with 70714000, and 750309 was installed in later units. 70714000 came in two versions that differed slightly (See table below):

Version 2 was built only with Rev C boards.

Version 1 was built with Rev A, B, or C boards. Thedifferentrevisionson this board weremanufacturing changes that did not change the schematic.

750309 Rev

Aboards are version

1.

750309 Rev

Band

C boards are version

2.

Some early version 1 boards did not have a shield

over the oscillator section

..

70714000

R327

R345 R363

R381 VR302

VR304 VR306 VR308

Version

1

4.7K 4.7K 4.7K 4.7K 10K 10K 10K 10K

2

10K 10K 10K 10K 20K 20K 20K

20K

2-2

TRANSMIT BOARD

,.--

--------

I '70"12'

....

-000

rEVAOONP

I

70724-000 REV A COMP

7--------

o

Figure 7

LocationofRev Level for Versions 1

and

2

All

Rev

Aboards

are

version1.Rev B boards

may

be

version 1 or

2:

Version R503 R521

CS31

1 4.7K 10K

.0033uF

2 15K

68K .001 uF

2-3

DETAILB

7

Item No.

Part

No. Descrilltion

Qty

19

53431005 Switch Button, round 2

20&

21

(Not Used)

22 878517 Connector bracket

I

23

59908001 Connector, B4MB Switchcraft I

24 150624-3 Telex label

1

25

878439-3

Front Panel

I

26

878430

Chassis 1

27

878521 Transmit Board 1

28

51845091

Screw, #6-32 x 3/16"

10

29

878662

Receive Board

1

30

51845093

Screw, #6-32 x 3/8" 6

31

51845055

#4-40 x 3/16", pan head

7

32 878431 Covel'

I

33 (Not Used) 34 51845074 Screw, #6-32 x 1/4", pan head 8 35 557000 Nut, #6-32, hex

I

36

500322

Screw, #6-32 x 3/8",

hex

head

I

37

760386

Insulator, Pre-impreg.

I

Mechanical

Parts

DETAILC

8

26

Item No.

Part

No.

Description

Qty

I 878519

PCB, Display

I

2 54460001

Receptacle, crimp

5

3 878520

PCB, Audio

I

4 51847011

Screw, #4-40 x 1/4", flathead

8

5

878560 Wireset

I

6 52264005 Connector Housing, 5 Pin I 7

0086300 Copper strip, .343 x .005

AIR

8 970011-1

Fish Paper 1

9

50049003 Lockwasher

16

10

51845038 Screw, #4-40 x

114",

pan head

18

II

51847003

Screw, #2-56 x 1/8" flathead

1

12

450520 Standoff

8

13

51856001

Screw, plastite, #2-28

7

14

270229

Lug 2

15

57722000

Connector, antenna

2

16

450464-1 Sprocket

I

17

450463-1

Volume Control Knob

1

18

53431002

Switch Button, rectangular

6

32

3

10-9-12

(TYPICAL

4 PLACES)

(SEE DETAIL A)

34

(TYPICAL 8 PLACES)

31

/(TYPICAL

3 PLACES)

,fj

13

11

Figure 8

Exploded View· BTR-200

10-9-12~

(TYPICAL

4 PLACES)

31

(TYPICAL 4 PLACES)

17

30

(TYPICAL\~e.

BOTH SIDES)

":

~.

th

13

10

--===--

(TYPICA~

4 PLACES)

_._

:.:

/'

1

",...

...

/"

..

'

/ ;b

",

J/~

..

""/""

10

"*--/t-'12

DETAIL A

25

~//

TfJ

2~/'>

19'2124//~

18

(TYPICAL 6 PLACES)

2-4

CHAPTER 3

TRANSMIT, RECEIVE & AUDIO CIRCUIT,BOARDS

BTR-200 INSTRUMENT DISASSEMBLY

o

1.

Remove 6 each #6 pan head phillips and 7 each

#14 head phillips screws and remove cover.

Refer

to

Figure

8.

2.

Unsoldercoaxcablesfrom transmitandreceive

boards.

3. Unsolder 3 copperstrapsfrom receive board (if present)

4.

Remove transmit and receive boards. Early versions are equipped with snap-on nylon standoffs and later versions are held with #4 pan head phillips screws.

5.

Remove ring nutsfrom the two RF connectors.

6. Remove the hex head nylon screw and nut

holding

Q1

08

to the chassis.

7. Remove 8 each #4 flat head phillips screws

holding the fourXLRconnectorhousings

to

the chassis. On some early versions, the upper PEM nuts will be replaced with nuts and lock-

washers.

8.

Using an

XLR

tool

or

small

flat

bladed

screwdriver, unlock the XLR housings by turn-

ing the locking screw counterclockwise. Then remove the

XLR

housings by pulling them to

the rear.

3-1

9.

Unplug the cable harness at

P1l4

and the two

ribbon cables at P102 and P103.

10.

Remove 10 each #6 pan head phillips screws holding the circuit board

to

the chassis.

11.

Slide the circuit board forward and lift up and outfrom the rear.

12. Remove 8 each #6 pan head phillips screws holding front panel

to

chassis.

13. Remove 2 each #4 pan head phillips screws

holding headset connector bracket to chassis and remove front panel.

14. Remove

7 each phillips sorews holding front

circuit board to front panel and remove circuit board. NOTE: When refitting this circuit board the volume control on the front panel must be positioned so that the pins and slots mate properly.

15. Reassembly is the reverse

of

these procedures.

CIRCUIT DESCRIPTION

TRANSMIT BOARD

ALIGNMENT PROCEDURE

U50IC is an amplifier whose gain is controlled by the level

of

audio entering the rectifier at pin 16. As the level here increases, the gain is decreased and this results in a 2:1 compression characteristic. Pre-emphasis is added by U501B. R504, R505, and C508 set this at 115uS. C531 rollsthe response off above

10KHztofurther attenuate the 20 KHz call signal (see Audio Board Circuit Description). Q501 is a Colpitts oscillator with the collector tuned

to

the third harmonic. T501, VVC501 and

VVC502 are added in

selies with the crystal

to allow frequency modulationofthe oscillator. The oscillator is operated

10KHz

below the series

resonant point

of

the crystal. This improves

linearity at the expense

of

some stability. Q502 is a trip1er and Q503 is a straight through amplifier. The catTier frequency is thus nine times the crystal. C529, C530 and L503 function as a low pass filter and matching network.

3-2

EQUIPMENT

REQUIRED:

o RF POWER METER o FREQUENCY COUNTER o DC VOLTMETER

1.

Connect the RF power meter and frequency counter

to

the Transmit Antenna jack. Make

sure the Transmitswitch

on

the

reat·

panel is set

the the Cont position.

2.

Adjust T502, T503, T504, VC501, and VC502

for maximum power. Note:

If

adjustments are

severly outofalignment and no output can

be

obtained, it may be necessmytofirst adjust T502and T503 for maximum DC voltage at the emitter

of

Q502. Then adjust T504 for maxi-

mum

DC

voltage at the emitterofQ503. Now

adjust VC501and VC502 for maximum power.

3. Adjust T501 for the

COlTeCt

frequency:

Y501 Marking Frequency

154T570

154.570

177T800

177.800

183T730

183.730

4.

Repeat Steps 2 and 3 as necessmy.

5. Deviation

will

be adjustedinthe audio board

alignment.

Voltage Tables - Transmit Board (878521)

U501

11

20

19

DEVICE

1====-r===r===r====jPI=N=N=U=rM=B=E"F'R==~===r==~==l1

.---

---,

18

17 16

15

14

13 12

5 2.5 2.5 2.5 2.5 1 2.5 2.5 2.5

2.5

2.5 0

9

10

87

6

53 4

2

1

U501

NUMBER

o

DEVICE E B C

Q50l

1.88

2.44

10

Q502

0.78

0.66 9.7

Q503

1.21

0.26

9.5

Q501, Q502

C

B

E

Q503

C

E

B

)

3-3

Figure 9

Transmit

Board

Component

Layout (Foil Side)

C503 PS12

C501

0

+

...

0+

n I

l'l

C525 a

l'l

RS20

I

USO

1

~

l'lN

U

R51

6 Y Y

o

')

ylQ

OC506 U502 CS11 C522

~~~6

0 0

R502

+~04

I()C512QQ

a

~

~@C501

-e::>- V a

lQ

+ R517 OS03 0 N

~nc5°bc50~

9'

~

nS005&'

::!

05'3-/\10

I Q §

t"03

",y

f1

-f

1505

CS08

~'3

101

00

I0 I

~~

I0 Iy

C~:

00

Al~

~O

"

O~

Y

-e:::>-

c:::>

Q~

Q

0,

~~N(]

u:;l'l(")ol'l~~

~

0

OC5:m~

R501 -e::>- D

~

0 0501 a C517

o~

o::y~~ylO

.....

~

C529 U

R504 C507

u:;

0

Y

WC502

l'l

00C516

C518?t

Q~~

~~

~Ol

L502

O

G

o

\J

Y R510 0 R 5

~

0

C5<t9,.-t @ Wc501 r

SILK

SCREEN

REV.S

U -e::>-

Al

R508

~

YSOl

VRS01

~

Figure 10

Transmit

Board

Component

Layout

(Component Side)

3-4

R502

R501

JoK

30K

C506 loopf

T

G50J

20

12

,

R503

R521

R504-

C507

P512

1UF

10K

1UF

4.7K

10K

(

I

..

13

14

(

1

10

I

+

C505

T

8

15

4-.7UF

G501

+

..

C504-

lOoU~

I

1UF

I T

C530

o

G511

I

+

10UF

..

G509 +

R508

N

47K

4.7UF

C510

4-.7UF

WC501

VR501

t-+-'-~\I\1~-'

MV21

08

T

5K

C513

R507

T

100pf

47K

T

T501

3-5

FREQUENCY

DEPENDENT

COMPONENTS

TABLE

FREQUENCY

C516

C519

C520

C523 C524 C529 C530

T501

154.570

MHZ

27PF 39PF 100PF

18PF 33PF 68PF 20PF

-000

177.800

MHZ

22PF 30PF 75PF 12PF 27PF

47PF 15PF

-002

183.730

MHZ

22PF

30PF 75PF

12PF 24PF 47PF 15PF

-002

Figure

11

Schematic Diagram Transmit Board - Version 1

L501

C527 J.3PF

VC502

Q503~502

MPs9011

L.

T

I

T

15

P512

( (

1

j'"

C506

100P~

"'f

20

12

10

8

C501

+

100U1

j"

R502

R501

30K

3.9K

16--l +

C505

4.7UF

..

C504

I

1UF

j'"

C507

1

UF"

+

R503

15K

C511i

10U~

j'"

U502

78L05

T501

FREQUENCY

DE:PENDENT

COMPONENTS

TABLE

FREQUENCY

C516 C519

C520

C523

C524

C529

C5JO

T501

154.570

MHZ

27PF

39PF

100PF

18PF

33PF

68PF

20PF

-000

177.800

MHZ

22PF

30PF

75PF

12PF

27PF

47PF

15PF

-002

183.730

MHZ

22PF

30PF

75PF

12PF

24PF

47PF

15PF

-002

Figure 12

Schematic Diagram TransmitBoard - Version 2

C530

I

C529

I

7'

T

PCB Transmit Assembly (878521-*)

Ref

No.

Description

Part

No.

PCB500

PCB Transmit

70724000

Capacitors

All

capacitorsinmicrofarads

unless

noted.

Ref

No.

Description

Part

No.

C501

Electrolytic, 100 51821524

C502-C504 Electrolytic, 1 51821106

C505 Electrolytic, 4.7 51821109

C506

Ceramic, 100

pF

35693019

C507

Electrolytic, 1 51821106 C508 Film, poly, .01 52719007 C509-C51O Electrolytic, 4.7 51821109 C511 Electrolytic, 10 52723008 C512

Ceramic, .01 52676107 C513 Ceramic, 100

pF

35693019

C514

Ceramic, TC, 47

pF

52713002

C515 Ceramic, TC, 68

pF

52713003

C516',2

Ceramic,22pF

35693011

C516

3

Ceramic, 27 pF

35693012

C517

Ceramic, .01

52676107

C518

Ceramic, 1.5

pF

35693047

C519,,2

Ceramic,

30

pf

35693046

C519

3

Ceramic,39pF

35693014

C520',2

Ceramic, 75

pF

35693061

C520

3

Ceramic, 100

pF

35693019

C521 Ceramic, 100

pF

35693019

C522

Ceramic, .001

52676101

C523,,2

Ceramic, 12

pF

35693008

C523

3

Ceramic, 18 pF

35693010

C524'

Ceramic, 27

pF

35693012

C524

2

Ceramic,

24

pF 35693060

C524

3

Ceramic, 33

pF

35693013

C525

Ceramic, .001

52676101

C526 Ceramic,

',lOO

pF

35693019

C527 Ceramic, 3.3

pF

35693002

C528

Ceramic, 100

pF

35693019

C529,,2

Ceramic, 47

pF

35693015

C529

3

Ceramic, 68

pF

35693017

C530,,2

Ceramic,

15

pF

35693009

C530

3

Ceramic,20pF

35693048

C531 Ceramic, .0033 (Version

1)

52719004

C531 Ceramic, .001 (Version 2)

52676101

Variable

Capacitors

VC501,

VC502

Variable Capacitor 35837007

Transistors

Q501, Q502 Transistor, 2N5770 54689000 Q503 Transistor, MPS-901

760376

Integrated

Circuits

mOl

IC,NE575N

53277003

U502

IC,78L05

54680005

Diodes

VVC501

Diode, MV2108 58675000

VVC502

Diode, MV2108 58675000

Variable

Resistor

VR501

5K

Variable resistor

57148068

Ref

No.

Description

Part

No.

Coils

T501

3

Coil

52978000

T501',2

Coil

52978002

T502, T503 Coil

52979000

T504

Coil

52977003

L501,,2

Coil,

Air

Wound 63725000

L501

3

Coil,

Air

Wound

63725005

L502,,2

Coil, Air Wound

6372..')000

L502

3

Coil,

Air

Wound

63725005

L503',2

Coil,

Air

Wound

63725000

L503

3

Coil,

Air

Wound 63725005

Crystals

Y501'

Crystal, 177.800

MHz

52989120

Y501

2

Crystal, 183.730

MHz

52989214

Y501

3

Crystal, 154.570

MHz

52989100

All

resistorsinohms,

1/8

Watt,

5%,

unless

noted.

Resistors

R501, R502

30K

52154025

R503

4.7K

(Version 1)

52154044

R503 15K(Version 2)

52154032

R504

10K

52154036

R505

15K

52154056

R506-R508

47K

52154020

R509, R510

10K

52154036

R511

820

52154062

R512

47

52154092

R513

47K

52154020

R514

5.6K

52154042

R515

100

52154084

R516

47

52154092

R517

8.2K

52154038

R518

470

52154068

R519

56

52154090

R520

47

52154092

R521

10K

(Version

1)

52154036

R521

68K

(Version 2)

52154016

R522

10K

52154036

Connector

P512

Header, 3

670062

878521-*

Frequency

*Dash

No.

Reference

No.

177.800

MHz

-177 1

183.730

MHz

-183

2

154,570

MHz

-154 3

3-7/3-8 Blank

RECEIVE BOARD

()

CIRCUITDESCRIPTION

PCB 70714000

This unit is a four channel single conversion receiver consisting

of

one front end and four I.F. strips. Signals entering the board proceed through 3 tuned circuits,

Q30l,

and 3 more tuned circuits

to

the mixer. MX301 is a doubly balanced diode mixer and receives +7 dBm from the oscillator. Q302 is a Colpitts oscillator with the collector tuned

to

the second harmonic. Y301 operates on the fifth overtone with C319 and L308 acting as mode suppressor. L310 is used

to

setthe oscillator on frequency. From the mixer the signal continues through a broadband filter to line driver Q303. VR309 is used

to

setthe collectorcurrentto 20 rnA. Q303 drives the four I.F. strips, beginning with crystal filters FL30l-FL308.

The

four I.F. strips are the same except for component values. Also, the 10.7

MHz

I.F. substitutes a ceramic filter for

two tuned circuits.

For

the remainder

of

the

description the parts in the 10.7

MHz

I.F. will be referredto. TheI.F. signalisamplified by Q304and U301A, and limited and detected by U301B. U301B contains a quadrature detector which is tuned by T309. Squelch is

of

the amplitude

type, the D.C. voltage at pin 5

of

U301 varying in propOltion to the signal strength. With no signal U302 pin 1islowand the audio outputissquelched. When the received signal causes the voltage at pin 3

of

U302toexceed thatofpin 2ofU302, pin 1

goes high and the squelch opens.

VR30l

sets the threshold at pin 2 and thus the squelch. R320 provides hysteresis. Q305 is used

to

drive the LED on the front panel. From U301 the audio is amplified by U303A. R389, R328 and C354 set the de-emphasis at 115uS. VR302 is used

to

compensate for variations in detector output level. U303B is a 3 pole ButterwOlth low pass filter with a cutoff frequency

of

10KHz.

3-9

PCB 750309

This unitis a fourchannel dualconversion receiver consisting

of

one front end and four I.F. strips. Signals entering the board proceed through 3 tuned circuits, Q301, and three more tuned circuits to the mixer. HY301 is a doubly balanced diode mixer and receives +7 dBm from the oscillator. Q302 is a Colpitts oscillator with the collector tuned to the second harmonic on version 1 boards and the third harmonic on version

2.

Y301 operates on the fifth overtone with C311 and L308 acting as mode suppressor. L307 is used to set the oscillator on frequency. From the mixer the signal continues through Q303

to

filtet drivers Q320, Q370, Q420 and Q470. On version 1boards the signal is resistively coupled to the filters. On version 2 boards it is inductively coupled.

The

four I.F. strips are the

same

except

for

component

values.

For

the

remainder

of

the description the parts in the 10.7 MHz I.F. will be referred to. U320A mixes the incoming signal with a 10.245

MHz

oscillator

to produce the second I.F.of455 KHz. (The other three oscillators operate at 455 KHz above their

n~spective

input frequencies). U320B contains a limiter and quadrature detector, which is tuned by L322. U320C functions as a

94

KHz bandpass filter for operating the squelch. With. no signal a largeamount

of

noise is present atU320 pin13and

a portion

of

this is rectified by Q321.Ifthe emitter

rises above .7V U320D clamps pin

16

to ground, muting the audio, and drives pin 15 low, extinguishing the LED on the front panel via Q322. When a signal is received, the noise at U320 pin

13 drops and lowers thevoltageat the emitterofQ321, releasing the audio clamp and lighting the front panel LED. Since the LED current flows through R33l,

the voltage drop acts on

Q32l

and provides hysteresis. VR321 adjusts not only the noise amplitude delivered

to

Q321 but also the D.C. bias, and is used to set the squelch at 1microvolt. From U320 the audio

is

buffered and filtered by U321.

R328, C335, and VR320 set the de-emphasis at

l15uS. U321Aisa three poleButterworth low pass

filter with a cutofffrequency

of

10 KHz.

ALIGNMENT PROCEDURE

Receive Board - 70714000

Equipment Required:

D Signal Generator D Sensitive RF Voltmeter D DC Voltmeter

D AF Voltmeter

1.

Connect the signal generatortothe Receive Antenna jack. Set the deviation at

±3 KHz at

1 KHz. Refer to the frequency chart below. Look at the marking on the Y301 and set the generator

to

the corresponding ALIGN fre-

quency.

11.

Place the RF voltmeter probe tip inside the top ofL304.

12.

Adjust VC304 for a peak indication.

13.

Adjust VC305 for a null indication.

14.

Adjust VC306 for a peak indication.

15.

Place the RF voltmeter probe tip on the collector

ofQ303

and adjust T301, T302, and T303

for a peak indication.

Y30l

Align

CHl

CH2

CH3 CH4

Marking

171R905

170.705 171.905 171.045 170.245

169.505

207R800 206.900

207.800 207.425 206.800 206.000

213R800

212.900 213.800 213.425 212.800

212.000

2.

Adjust VR309 for 0.44 VDC across R312.

3.

Place the RF voltemter probe tip inside the top of

L307 and adjust VC307 for a peck indica-

tion.

4.

Set the RF voltmeter to its most sensitive scale without stray pickup.

5.

Place the RF voltmeter probe tip inside the top of

L301.

6.

Increase the signal generator output level until the

RF

voltmeter indication just beginstorise.

7.

When adjusting, reduce the signal generator output rather then reducing the RF voltmeter sensitivity.

8.

Adjust VC301 for a peak indication.

9.

Adjust VC302 for a null indication.

10.

Adjust VC303 for a peak indication.

3-10

16.

In the following alignment, unless othelwise directed, adjust the signal generator output level

to

maintain aDC voltageofbetween 1and

1.5 volts.

17.

Set the signal generatortothe channel 1 frequency.

18.

Adjust T304, T305, and T308 for maximum DC voltage at pin 5

of

U301.

19.

Set the signal generator outputto1 mV and adjust T309 for maximum audio at pin 7 of U303.

20. Adjust VR302 for 140 mV ofaudio at pin 7

of

U303.

21. Set the signal generator output

to

1~V and

adjust VR301

to

just extinguish the number 1

LED

on

the front panel.

22. Set the signal generator

to

the channel 2 fre-

quency.

23.

Adjust

T31O,

T311, T312, T313, and T314 for

maximum DC voltage at pin 5

of

U304.

24. Set the signal generator output to 1 mV and adjust T315 for maximum audio at pin 7

of

U305.

25. Adjust VR304 for 140

mVofaudio at pin 7

of

U305.

26. Set the signal generator outputto1~V and adjust VR303

to

just extinguish the number 2

LED on the front panel.

27. Set the signal generator

to

the channel 3 fre-

quency.

28. Adjust T316,

TIl?,

T318, T319, and T320 for

_ maximum DC voltage at pin 5 of U306.

29. Set the signal generator output

to1mV

and adjust T321 for maximum audio at pin 7 of U307.

30. Adjust VR306 for 140 mV of audio at pin 7

of

U307.

31. Set the signal generator outputto1

~V

and

adjust VR305

to

just

extinguish the number 3

LED on the front panel.

32. Set the signal generator

to

the channel 4 fre-

quency.

33. Adjust T322, T323, T324, T325 and T326 for maximum DC voltage at pin 5 of U309.

34. Set the signal generator output

to

1 mV and

adjust T327 for maximum audio at pin 7

of

U31O.

35. Adjust VR308 for 140 mVofaudio at pin 7

of

U31O.

36. Set the signal generator output

to

1~V and

adjust VR307

to

just extinguish the number 4

LED on the front panel.

Receive

Board

- 750309

EquipmentRequired:

D Signal Generator

D Sensitive RF Voltmeter

D Audio Distortion Meter D Spectrum Analyzer

or

VHF

Monitor

D AF Voltmeter- D SINAD Meter

lA

Version

1:

Place the RF voltmeter probe tip

inside the top

of

L309 and adjust VC307 for a

peak indication.

1B

Version

2:

Place the RF voltmeter probe tip inside the top of L313 and adjust VC307 and VC308 for a peak indication.

2.

Connect the signal generatortoa shott piece

of wire and set ittothe oscillator frequency as shown

in

the chart below:

3.

Using either a spectrum analyzer or a VHF monitor, adjust L307 for a zero beat.

Y30I Oscillator

CHI

CH2

CH3

CH4

Marking

171

R905 182.605 171.905

171.045

170.245

169.505

207 R800

218.5

207.800 207.425

206.800

206.000

213 R800

224.5

213.800 213.425

212.800

212.000

3-11

4. Connect the signal generator

to

the Receive

Antenna jack. Set the deviation

to

±3 KHz at

I KHz. Referto thechartandselectthechannel

3 frequency.

5. Connect the AFvoltmeter, distortion meter, and SINAD meter

to

U421 pin

1.

6.

AdjustVR421tomaximum counterclockwise.

7.

Adjust

VC301,

VC302,

VC303,

VC304,

VC305 and VC306 for best SINAD.

8.

Increase signal generator outputtoI m

V.

9 Adjust L422 for maximum audio.

lOA.

Version I: AdjustL421 and L422for minimum distortion.

lOB. Version

2:

Adjusut L421, L422 and L423 for

minimum distortion.

11.

Adjust VR420 for 140 mVofaudio.

12.

Set the signal generator outputtoI

!-tV.

13.

Adjust VR421 fully clockwise, then turn it counterclockwise until the number 3 LED

on

the front paneljustcomes on.

14.

Set the signal generator to the channel I fre-

quency and increase the output

to

1m

V.

15.

Move the audio hook up to U321 pin I.

16.

Adjust L322 for maximum audio.

17A.Version I: AdjustL321 andL322 for minimum

distortion.

17B. Version

2:

Adjust L321, L322, and L323 for

minimum distortion.

18.

Adjust VR320 for 140 mVofaudio.

19.

Set the signal generator outputtoI

!-tv.

20. Adjust VR321 fully clockwise, then turn it counterclockwise until the number I LED on the front panel justcomes on.

21. Set the signal generator

to

the channel 2 fre-

quency and increase the output

to

I m

V.

22. Move the audio hook uptoU371 pin I.

23. Adjust L372 for maximum audio.

24A. Version I: Adjust L371 and L372 for minimum

distortion.

24B. Version

2:

Adjust L371, L372, and L373 for

minimum distortion.

25. Adjust VR370 for 140 mV

of

audio.

26. Set the signal generator output

to1!-tv.

27. Adjust VR371 fully clockwise, then turn it

counterclockwise until the number 2 LED

on

the front panel just comes on.

28. Set the signal generator

to

the channel 4 fre-

quency and increase the output

to

I m

V.

29. Move the audio hookupto

U471 pin

1.

30. Adjust L472 for maximum audio.

31A.Version I: AdjustL471 and L472 for minimum

distortion.

31B.Version

2:

Adjust L471, L472, and L473 for

minimum distortion.

32. Adjust VR470 for

140

mVofaudio.

33. Set the signal generator output

toI!-tv.

34. Adjust VR471 fully clockwise, then turn it counterclockwise until the number 4 LED on the front panel justcomes on.

3-12

o

/

NOTES:

3-13

Voltage Tables - Receive

Board

(70714000)

S

Gl

~

Q301

D

G2

DEVICE G1

S

G2

D

Q301

0

1.58 1.58

8.68

B C

3.3 8.56

1.23 4.2

Q302 Q303

C

B

E

Q304 - Q311

NO

SIGNAL

UNSQUELCHED

10 10

1.08

o

1.89

7.34

DEVICE

E

Q302 2.54 Q303 .44

Q304, Q306,

2.63

Q308, Q310

Q305, Q307,

0

Q309,

Q311

6.65

DEVICE

t==r-=r-=PrIN=N=UrM=B=E=Rr===r====r=====I

16 15 14 13 12

11

10

9

U301 U304 U306 U309

1.58

1.61

o 1.59

1.59 1.59

1.

73

DEVICE

1I==,=====,====PFI=N=N=UFM=B=E=Rr=====.===.==l

16 15 14 13 12

11

10 9

PIN NUMBER

1 2 3 4 5

6

7

8

1

U301 U304 U306 U309

1.58 1.58

1.61

0 1.59

1.59

1.73

1.58

0 7.35 6.09 3.34 2.07 1.84 3.44

tmV

RF

IN

U301, U304, U306,

U309

1

2

3 4 5

6

7

8

PIN NUMBER

3-14

Voltage

Tables·

Receive

Board

(70714000) Continued

Voltage Tables •

Receiv~

Board

(750309) Continued,

1

,

U320, U370, U420,

U470

I

123

4 5 6

789

NUMBER

i

2.13 0 0 0

0.792.57

2.47,0 5.5 NO

:111111111111111111111111111.!11111!111111[~11111111111111111111111111!11111111111111!lllih:::::::~:l~II!1111111111111111111111Ii'l.I!lllllllllrl!IIIIIIIIIIII~r.

...

·

:~:

SIGNAL

i

10 9.38 9.26 10

1.1 1.1

1.11

10 5.9

i

I

U320 U370 U420 U470

DEVICE

l--___r---r--..,.-P-IN--rN-U-M-BI"""'E-R--r--+r--

........

---t

18 17 16 15 14 13

12,

11

10

1

U302, U303, U305,

U307, U308, U310

NO

SIGNAL

0.05 1

.21

0

123

4

NUMBER

U302 U308

10 0.05 1 .21

DEVICE

t===P.,..IN=N_U=M=B....,E.-=R==j

876

5

550

1

234

NUMBER

10 5 5 5

U303 U305 U307 U310

DEVICE

.......

_PIN.,.-N_U"T"M_B..,.E_R-==J

8 7 6 5

Voltage Tables - Receive

Board

(750309)

DEVICE

1----r_...,.._-,-.P_IN-rN_U_M.....,Br-E_R......,._.,..Ir--.....,._""""1

18

17

16 15 14 13

121

11

10

o

L303

[Q]

G20

0

O

a.

/

<"4

G10S

NOTE: If this part

is absent, then surface mount part has been installedonfoil side. Pad designations are the same.

DEVICE

VERSION

Gl

G2

D

S

Q301

1

0

1

9.22 1

Q301

2 0 1.8 8.8

0.36

U320 U370 U420 U470

I

\

2.13 0 0 9.34 0.36 2.57

2.471

0 5.5

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIUNSQUELCHED

1

I

10 9.38 9.26 10

1.1 1.1

1.1·

10

5.9

123

456

789

PIN NUMBER i

Q302, Q320, Q370,

Q420, Q470

Q321, Q322, Q371, Q372, Q421, Q422,

Q471, Q472

DEVICE

E B

C

Q302

3.69

4.37

9.22

Q320, Q370,

1.05 1.76

5

Q420,Q470

0.8 1.54

10

Q321, Q371,

0.79 0.77 10

NO SIGNAL

Q421, Q471 Q321, Q371,

0.35 0.8 9.4

UNSQUELCHED

Q421, Q471 Q322, Q372

0.79 0

10

NO SIGNAL

Q422, Q472 Q321, Q371,

8.67 9.34 9.4

UNSQUELCED

lj

Q421, Q471

3-15

RJ19

1.5K

RJ1S

1.5K

~-------'--------------------r---:-:--------~----------,

CJ4B

47PF

PJ09

CJ67 +

lUF

r

,

RJ42 220K

UJOJ:A

RJ29

R3JO

RJJ1

__

~+

NE5532

10K 10K 10K

RJ24

~.

220K,

CJ56 CJ57

, " ,0022UFlo056UF

r--1'

Rg~:,

j ,

-t~r

RJ25

10K

CJ54

OO'~

....

_

l

QJ07 MPSJ704

3-16

•

0385

1

R343

I10UF'

10K

"'f

'7RJ45

V.l 4.7K

V.2

10K

CJB2 .1UF

RJ60 220K

C

P311

SR3.,

'r

I

lOUr

10K

C41B

'7

RJ63

.OO15Uf

I

V.l

4.7K

V.2

10K

0309

~

MPSJ704

C419 + lUF'+

C444

I

C446 .1Uf

RJ76 220K

C

PJ10

RJ79

T

10K

RJB6

C450

10K

.OO15Uf

RJ76

22K

VRJOB

I

V.l

10K

VRJ07

V.2

20K

5K

C451 +

,

lUf~

Q304

MPSJ640

CJJJ

F1.J09

C326U~3:~2~PFTl

SFE10.7J .01UF

G6PF

"=

CJ29

'Rg;g

470PF

C339 T

i"

T .

01UF

-t"

RJ17

220

R371

220

RJJJ

1.5K

CJ69

0302

lN4148

CJ64 CJ66

,OlUF

"

O""Q,~I~~~O"

UJ04:A

NEBl4

~d

C3.W

7313

Ie3

••

RJJ6

220

390P TJ12

39QP

CJ70

RJJ5

CJ71 I

.OlUF

220

.,

..

T

,

,OlUF

""f

,

RJ40

22K

VRJOJ

5K

,

RJ51

RJ55

1.5K

DJOJ

lN4148

CJ96

'"lp~lr

C39J CJ97

TJ18

C400

C402

RJ53

,

C403T

.OlUF

220

i'

T

,OlUF

Y

FL307 FL308

C424

13.1MHZ 39PF

12.5MHZ 43PF

FL303

1

FREQUENCY

FL304 C334 IC360

c3621c3631c3641c3651c3661c3671

C373 IC3801

1169-172

MHZ

11.56MHZ

.001

UF

150PF

175PF168PFli .oPFI39PF h.oPFI50PFI 470PF

139PF

I

1206

214

MHZ

11.075MHZ 6.2PF

156PF

82PF 175PFIt, 1PFI43PF

It,

1PF!56PFIS60PF

143PF

1

Figure 13

Schematic Diagram Receive Board

70714000

PCB Assembly 878522

CJ25

10PF'

LJ09

1MH

R31J

240

,

C31J

C30::f

LJ05

VC305,

VC30.

CJoa

I

lOOPF

,

Q301

3SK174

FL305

,

FREQUENCY

FL306

C3921

C393 IC3941c3951c3961c3971c3981c3991 C400 1 C405 IC4061c4071 C408 IC4121

t-

12.36MHZ 43PF I 330PF 168PF150PF 1.82PFI36PF!.82PFI43PF 1330PF I 390PF

120PF

1330PF 136PF 1

'169

172

MHZ

\206-

214

MHZ

11,7MHZ

4

7PF

\ 390PF \75PF\62PF!1.0PFI39PF 11.0PF147PFI 390PFI 470PF 124PFI24PFI 270PF 139PFI

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o @R309@

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(Q) @ 03°05

ID

0311

em

@

0309

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o

Figure

14

Receive

Board

Component

Layout

(Component

Side)

Versions 1

and

2

70714000

3-17

P320

P470

~P370

~P420

C479

.OO47UF

WV~=::':-+-III--+..llj·::-""

R471

lK

R470

4.7K Cf470

FB421

0470

MPSH10

FB371

0370

MPSH10

0320

MPSH10

R313

10K

R314

2.2K

+-+----t------.---.-,=~----

Figure 15

SchematicDiagram Receive

Board

Version 1 - 750309

PCB Assembly 878662

L312

10UH

C316

.0lUr

C315 .01

ur

I

or

C306

C30~

VC305rVC306

T

R307

2.2K

R305

R306

lK

100

C305

I lOOP/,

or

T

C302

P301

C301

T

FREQUENCY

C301

C302

C303

C307

C308 C313

C421

C422

,C472

CF370

CF420

CF470

L308

Y301

Y370

Y420

Y470

CF371

CF421

CF471

0420

169-172

MHz

5.6

pI'

.62

pI'

.50 pF

.50

pI'

1.2pF

4.7

pI'

150

pI'43PI'

39pF

11.56

12.36

13,1

.15/lH

171.005

12.015

12,815

12,555

MPSH10

MHz

MHz MHz

MHz

206-208

MHz

4.7

pI'

.SOpF .33

pI'

.33

PI'

.33

pI'

2.2pF

180 PI'

50

pI'43pI'

11.075

11.7

12.5

.1O/lH

207.6

11.53

12,155

12.955

MHz

MHz MHz

212-214

MHz

4.7

pI'

.SOpF .33

pI'

.33

pI'

.33

pI'

2.2

pI'

180

pI'50pI'43pI'

11.075

11,7

12,5

.1OIIH

213.6

11.53

12.155

12.995

MHz

T

o--1~~VC303

1 r

L301

r

L302

T I I

3-18

~<:>

o

L372

Figure 17B

Receive

Board

Component

Layout

(Component Side)

Version 2

750309

Figure

1'"(

A

Receive

Board

Componen~

Layout

(Foil Side)

vo~oQ01o

I~~o~

0

1000I~':CD~'t

0'(0

tr~

I

QAgT

01'~

.:

o

CJo

-c:>-

C305

~

L304

~

• P30l

OC3l4

L3l3

C3ll

0

i6i?7

I

C30l

C302

C303

R30l

-e>

II:

g c=:Jo

C30

r L3l2

(J'

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R31Jc):

(J

0D

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p

C3150

c=:J-

,c=:J-

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0

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I

306

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c=:J-

Q303IC~6

~3l4

L308

C3l2

Q302 0

L307

II

R313

L3ll

~

O

FB371

OR321

FB321

R471j\

FB421

R4210 R430

Q37b

R37l

~

Q320

L\

D Ii

R480

G-

Q420D

g R429

R380

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R330

~

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L373

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R470

L4703

:s;(:R479

L4~

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0 388

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R320

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R329

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486

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7

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ril

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00

C3890-C:>-L03C20320

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1

n

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0

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CF47

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00

0

C4890°

R~::o

CF420

i0 0 00R434

L370

L37l

Uhy

01

L32l

olJ

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00

R334

L470

L47l

O~

00

R484

L420"'0L42l

a~o~~-c:>-

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Ii

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l::

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550'

Y420

8 5

R433

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a -c:>-

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c:::Ji$

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II:

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c::::>

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0

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R383

C324'QOU

0 0 a

R333

C4740

° 0 0 0

~

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C4240

°

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2l(J

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>

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13

00

~~:000>~8~00~

CF372

3

,.

0 0 0

C4760

0 0

If'\

5 C42a 0 0 >

C37f'

0

og

Q

~

C3260

00

Q

~

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~

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~0

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(J°D>

11:

0

--

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D~2o~:O°

D°

~

C378

-e:>-

Q37l

L322

C328 C334

(J

-e:::>-

c:>

L472

' g478

C484

-c:>-

c:::>

G

C434

~

C435

R378

c::::>

R328

C335

R478

C485

470

L422

(J

R42~

P420

C385

P370

P~20

-

-.

~a

>

o~

o

r:--------,

o

(j

3-19

FREQUENCY

DEPENDENT

COMPONENTS

TABLE

FREQUENCY

CJ01 C302

C30J

C307

CJOB

CJ1J C421 C422 C472

CF370

CF420 CF470

L306

Y301 Y370 Y420 Y470

CFJ71

Cf.421

CF471

169-172

MHZ

S.6PF .B2PF

.SOPF

1.2PF

.SOPF

1S0PF

4JPF 39PF

11,58 12,J8

1J.1

.22UH

171.905

12.015

12.815

\2.555

MHZ

MHI

MHZ

MIlZ

MHZ

206-208

MHZ

4.7PF .50PF

.33PF .33PF

.33PF

.J3PF 180PF

SOPF

43PF

11.075

11.7

12.5

.15UH

207.6

11.53

12,155

12.955

MHZ

Mill

MHZ

MHZ MHZ

MHZ

212-214

MHZ

4,7PF ,50PF .33PF .33PF

,J3PF

.33PF

laOPF

SOPF

4JPF

11.075

11.7

12.5

.1SUH

21J.8

11.53

12.155

12.9"

MHZ

MHI

MHl

MHZ MHZ MHZ

PJ01

9

C301

C"2

RJ15

47K

R305

IK

",307

3.JK

R306

"0

CJ<lB

I,001uF

,

C3"

CJ<l~V"OB

"'05yI.305

,

CJ',

C318

100PF I

I·oo1uF

1'"

CJ15

,01UF I

,

RJ12

470

L312

'OUH

1.311

10UH

C316

,01Uf

R31J

10K

RJ14

2,21<

Figure 18

Schematic Diagram Receive Board

Version 2 . 750309

PCB Assembly878662

G

PJ20

T

G

P420

,

~P470

'I

I

L-

~

3-20

PCB Receive Assembly 878522-*

lJ

Ref

No.

Description

Part

No.

PCB300/400

Printed Circuit Board, Receive

70714000

Capacitors

All

capacitors in microfarads unless noted.

Ref

No.

Description

Part

No.

C301

1

Ceramic, 5.6 pF

35693004

C301

2

,3

Ceramic, 4.7 pF

35693003 C302 (Not Used) C303

1

Ceramic, .82 pF

52007003 C303

2

,3

Ceramic,.5pF

52007000 C304

(Not Used)

C305

1

Ceramic,.5pF

52007000 C305

2

,3

Ceramic,

.33

pF

52007012 C306

(Not Used)

C307, C308 Ceramic, 100

pF

35693019 C309, C310

(Not Used)

C311

Ceramic, .001

52676101 C312 (Not Used) C313

1

Ceramic, 1.2 pF 52007009

C313

2

,3

Ceramic,

.33

pF

52007012 C314

(Not Used)

C315

1

Ceramic, 4.7 pF 35693003

C315

2

,3

Ceramic, 2.2 pF 35693000 C316 (Not Used) C317

Ceramic, .001 52676101 C318

Ceramic, 56

pF

35693016

C319

Ceramic, 47

pF

35693015

C320

Ceramic, 4700 pF

52676105 C321, C322 Ceramic, 12 pF 35693008 C323

Ceramic, 36

pF

35693078 C324 Ceramic,

9.1

pF

35693056 C325

Ceramic,

10

pF 35693007

C326, C327

Ceramic,

.01

52676107 C328

Ceramic, 56 pF 35693016

C329

Ceramic, 470

Pf

35693026 C330

Ceramic, 82 pF 35693018

C331 Ceramic, 100 pF

35693019 C332 (Not Used) C333 Ceramic, 8.2 pF

35693006 C334

1

Ceramic, .001

52676101 C334

2

,3

Ceramic, 6.2 pF

35693074 C335, C336 (Not Used) C337-C340 Ceramic,

.01

52676107 C341 Ceramic, 560 pF

35693027 C342, C343 Ceramic, 27

pF

35693012 C344 Ceramic, 470 pF

35693026 C345, C346

Ceramic,

.01

52676107 C347

Ceramic, 2.2 pF 35693000

C348 .Ceramic, 47

pF

35693015 C349 Ceramic,

.01

52676107 C350

Ceramic,

.1

52676113 C351 Ceramic,

100

pF 35693019

C352 Ceramic,

.01

52676107 C353 Electrolytic,

10

52723008 C354

Ceramic, 1500 pF 35693032

C355 Electrolytic, 1

51821106 C356 Poly Film, .0022 52719053 C357 Poly Film, .0056 52719068 C358 Ceramic, 330 pF 35693024 C359 Ceramic,

.01

52676107 C360

1

Ceramic, 50

pF

35693049 C360

2

,3

Ceramic, 56

pF

35693016

RefNo.

Description

Part

No.

C361

Ceramic, 390 pF

35693025

C362

1

Ceramic, 75 pF 35693061

C362

2

,3

Ceramic, 82 pF 35693018

C363

1

Ceramic, 68 pF 35693017

C363

2

,3

Ceramic, 75 pF 35693061

C364

1

Ceramic, 1

pF

35693054

C364

2

,3

Ceramic, 1.1 pF

724772

C365

1

Ceramic, 39 pF

35693014

C365

2

,3

Ceramic, 43 pF

35693070

C366

1

Ceramic, 1 pF 35693054

C366

2

,3

Ceramic,

1.1

pF 724772

C367

1

Ceramic,50pF 35693049

C367

23

Ceramic, 56 pF 35693016

C368

Ceramic, 390 pF 35693025

C369-C372

Ceramic,

.01

52676107

C373

1

Ceramic, 470 pF

35693026

C373

2

,3

Ceramic, 560 pF

35693027

C374, C375

Ceramic, 24 pF

35693060

C376

Ceramic,

470 pF

35693026

C377, C378

Ceramic, .01

52676107

C379

Ceramic, 2.2 pF 35693000

C380

1

Ceramic,39pF

35693014

C380

2

,3

Ceramic, 43 pF

35693070

C381

Ceramic, .01

52676107

C382

Ceramic,

.1

52676113

C383

Ceramic, 100 pF

35693019

C384

Ceramic,

.01

52676107

C385

Electolytic, 10

52723008

C386

Ceramic, 1500 pF 35693032

C387

Electrolytic, 1

51821106

C388

Poly Film, .0022

52719053

C389

Poly Film, .0056

52719068

C390

Ceramic, 330 pF

35693024

C391

Ceramic,

.01

52676107

C392

1

Ceramic,43 pF

35693070

C392

2

,3

Ceramic,47pF

35693015

C393

1

Ceramic, 330 pF

35693024

C393

2

,3

Ceramic, 390 pF

35693025

C394

1

Ceramic, 68 pF 35693017

C394

2

,3

Ceramic,75 pF 35693061

C395

1

Ceramic,50pF 35693049

C395

2

,3

Ceramic, 62 pF

35693071

C396

1

Cerainic, .82 pF

724771

C396

2

,3

Ceramic, 1pF

35693054

C397

1

Ceramic, 36 pF

35693078

C397

2

,3

Ceramic, 39 pF 35693014

C398

1

Ceramic, .82 pF 724771

C398

2

,3

Ceramic, 1 pF

35693054

C399

1

Ceramic, 43 pF

35693070

C399

2

,3

Ceramic, 47 pF 35693015

C4OO

1

Ceramic, 330 pF

35693024

C4OO

2

,3

Ceramic, 390 pF 35693025

C401-404

Ceramic, .01

52676107

C405

1

Ceramic, 390 pF 35693025

C405

2

,3

Ceramic, 470 pF 35693026

878522-*

Frequency *Dash No.

Reference No.

169.505-171.905 MHz -171

1

206.000-207.800 MHz

-207 2

212.000-213.800 MHz -213

3

3-21

PCB Receive Assembly 878522-* (Continued)

RerNo.

Description

Part

No.

C406

1

Ceramic, 20 pF

35693048

C406

2

,3

Ceramic, 24

pF

35693060

C407

1

Ceramic, 20 pF

35693048

C407

2

,3

Ceramic, 24

pF

35693060

C408

1

Ceramic, 330

pF

35693024

C408

2

,3

Ceramic, 270

pF

35693076

C409, C410

Ceramic,

.01

52676107

C411

Ceramic, 2.2

pF

35693000

C412

1

Ceramic, 36 pF

35693078

C412

2

,3

Ceramic, 39 pF 35693014

C413

Ceramic,

.01

52676107

C414

Ceramic,

.1

52676113

C4i5

Ceramic, 100 pF 35693019

C416

Ceramic,

.01

52676107

C417

Electolytic, 10

52723008

C418

Cel'amic, 1500

pF

35693032

C419

Electrolytic, 1

51821106

C420

Poly Film, .0022

52719053

C421

Poly Film, .0056

52719068

C422

Ceramic, 330

pF

35693024

C423

Ceramic,

.01

52676107

C424

1

Ceramic, 39 pF

35693014

C424

2

,3

Ceramic,43pF

35693070

C425

1

Ceramic, 270

pF

35693076

C425

2

,3

Ceramic, 330 pF

35693024

C426

1

Ceramic, 62 pF

35693071

C426

2

,3

Ceramic,68pF 35693017

C427

I

Ceramic,43pF 35693070

C427

2

,3

Ceramic,50pF 35693049

C428

Ceramic, .82 pF 724771

C429

1

Ceramic,30pF

35693046

C429

2

,3

Ceramic, 33 pF 35693013

C430

Ceramic, .82

pF

724771

C431

1

Ceramic, 39 pF

35693014

C431

2

,3

Ceramic, 43 pF

35693070

C432

1

Ceramic, 270 pF 35693076

C432

2

,3

Ceramic, 330 pF

35693024

C433-C436

Ceramic,

.01

52676107

C437

1

Ceramic, 390 pF

35693025

C437

2

,3

Ceramic, 470 pF

35693026

C438

1

Ceramic,18pF 35693010

C438

2

,3

Ceramic, 20

pf

35693038

C439

1

Ceramic,18pF

35693010

C439

2

,3

Ceramic, 20 pf 35693038

C440

Ceramic, 270 pF 35693076

C441-C442

Ceramic,

.01

52676107

C443

Ceramic, 2.2 pF 35693000

C444

1

Ceramic, 30 pF 35693046

C444

2

,3

Ceramic, 33 pF

35693013

C445

Ceramic,

.01

52676107

C446

Ceramic,

.1

52676113

C447

Ceramic, 100

pF

35693019

C448

Ceramic,

.01

52676107

C449

Electolytic,

10

52723008

C450

Ceramic, 1500 pF 35693032

C451

Electrolytic, 1

51821106

C452

Poly Film, .0022 52719053

C453

Poly Film, .0056 52719068

C454

Ceramic, 330

pF

35693024

VC301-VC307

Capacitor, Variable

723086-4

RerNo.

DescrIption

Part

No.

Intergrated

Circuits

0301

IC, NE614

760375

0302

IC,LM393

53284000

0303

IC, NE 5532AN 53295001

U304

IC, NE614 760375

0305

IC, NE 5532AN

53295001

0306

IC, NE614

760375

0307

IC, NE 5532AN

53295001

0308

IC,LM393 53284000

U309

IC, NE614

760375

0310

IC, NE 5532AN 53295001

Potentiometers

VR301

5K

Potentiometer

57148068

VR302 20KPotentiometer

57148071

VR303

5K

Potentiometer

57148068

VR304 20KPotentiometer

57148071

VR305

5K

Potentiometer

57148068

VR306

20KPotentiometer

57148071

VR307

5K

Potentiometer

57148068

VR308

20K Potentiometer

57148071

VR309

50K

Variable Resistor

723091-1

Colis

and

Inductors

L3011L302 Coil, 2 1I2T,10nun

724778

L303

Coil, 1

3/4T,

724777

L303

2

,3

Coil, 1 1I4T,

724766

L304

1

Coil, 1 3/4T,

724777

L304

2

,3

Coil, 1 1/4T,

724766

L305

Coil, MC120 red wlcase

724775

L306

Coil,

1I4Tred w/case

724765

L307

1

Coil, 13/4T,

724777

L307

2

,3

Coil, 1 1I4T,

724766

L308

1

Inductor, .151lH

35689041

L308

2

,3

Inductor, .11lH

35689045

L309

Inductor, 1mH

35689035

L310

1

Coil, MC120 blue w/case

724767

L310

2

,3

Coil, MC120 green w/case

724769

Transistors

Q301 Transistor,

NE

25137

760488

Q302, Q303 Transistor, MPS-901

760376

Q304 Transistor, MPS-3640

54734000

Q305 Transistor, MPS-3704

54712000

Q306

Transistor, MPS-3640

54734000

Q307

Transistor, MPS-3704

54712000

Q308

Transistor, MPS-3640

54734000

Q309 Transistor, MPS-3704

54712000

Q310

Transistor, MPS-3640 54734000

Q311

Transistor, MPS-3704

54712000

878522-*

Frequency *Dash No. Reference No.

169.505-171.905 MHz -171

1

206.000-207.800 MHz -207

2

212.000-213.800 MHz -213

3

3-22

PCB

Receive Assembly 878522

M

*

(Continued)

o

Ref

No.

Description

Part

No.

Crystals

and

Filters

Crystal FilterInsulator

450471 MX301

Mixer, ASK-1

760382 Y301'

Crystal, Receive, 171.905 MHz

780089-1

Y301

2

Crystal, Receive, 207.800 MHz

780089-2

Y301

3

Crystal, Receive, 213.800 MHz

780089-3

FL3011FL302

Filter, 10.7 Crystal

780087-0

FL303

Filter, 11.56 MHz Crystal

780087-4

FL303

2

,3

Filter, 11.075 MHz Crystal

780087-7 FL304'

Filter, 11.56 MHz

Cryst31

780087-4 FL304

2

,3

Filter, 11.075 MHz Crystal

780087-7 FL305'

Filter, 12.36 MHz Crystal

780087-5 FL305

2

,3

Filter, 11.7 MHzCrystal

780087-2 FL306'

Filter, 12.36 MHz Crystal

780087-5 FL306

2

,3

Filter, 11.7

MHz

Crystal

780087-2 FL307'

Filter, 13.1

MHz

Crystal

780087-6

FL307

2

,3

Filter, 12.5

MHz

Crystal

780087-3 FL308'

Filter, 13.1

MHz

Crystal

780087-6

FL308

2

,3

Filter, 12.5 MHzCrystal

780087-3 FL309

Filter, SFE 10.7 MHz

J red

52990001

All resistors in ohms, 1/8

Watt,

5%,

unless noted.

Resistors

R301

lK

52154060 R302 10K

52154036 R303

130

52154081 R304

10

52154108 R305

lK

52154060 R306

i

R307 100

52154084 R308

470

52154068 R308

2

,3

180

52154078 R309-R311 10K

52154036 R312 22

52154100 R313

240

52154075 R314 4.7K

52154044 R315 1.5K

52154056 R316 16K

52154031 R317

220

52154076 R318

330

52154072 R319

l.5K

52154056 R320

10M, 1/4 watt

52154185 R321

10K

52154036 R322

22K

52154028 R323

lOOK

52154012 R324

220K

52154004 R325-R327 10K

52154036 R328

68K

52154016 R329-R331 10K

52154036 R332

4.7K

52154044 R333 1.5K

52154056 R334

16K

52154031 R335, R336

220

52154076 R337

l.5K

52154056 R338

10M, 1/4 watt

52154185

R339

10K

52154036

R340 22K

52154028

R341

lOOK

52154012 R342 220K

52154004

R343-R345 10K

52154036

R346 68K

52154016

R347-R349 10K

52154036

R350 4.7K

52154044

Ref

No.

Description

Part

No.

R351

l.5K

52154056

R352 16K

52154031

R353, R354 220

52154076

R355

l.5K

52154056

R356

10M, 1/4 watt

52154185

R357

10K

52154036

R358

22K

52154028

R359

lOOK

52154012

R360 220K

52154004

R361-R363 10K

52154036

R364 68K

52154016

R365-R367 10K

52154036

R368 4.7K

52154044

R369

l.5K

52154056

R370

16K

52154031

R371, R372 220

52154076

R373

l.5K

52154056

R374

10M, 1/4 watt

52154185

R375

10K

52154036

R376

22K

52154028

R377

lOOK

52154012

R378

220K

52154004

R379-R381

10K

52154036

R382 68K

52154016

R383-R385 10K

52154036

R386 2.2K

52154052

R387-R390

10K

52154036

Connectors

P301-P307

(Not Used)

P308"P311

3 Pin Header

670062

P312

(NotUsed)

P313

3 Pin Header

670062

Transformers

1'301-1'303

Transformer

724770

1'304,1'305 Transformer

724774 1'306,1'307 (Not Used) 1'308-1'324

Transformer 724774

Diodes

D301-D304 Diode, IN4148

52228000

878522-*

Frequency

*Dash No. Reference No.

169.505-171.905 MHz

-171 1

206.000-207.800 MHz

-207 2

212.000-213.800 MHz

-213 3

3-23

PCB Receive Assembly 878662-*

Ref

No.

Description

Part

No.

Printed Circuit Board, Receive

750309

Capacitors

All capacitors in

microfarads

unless noted.

Ref

No.

Description

Part

No.

C301

1

Ceramic, 5.6

pF

35693004

C301

2

,3

Ceramic, 4.7

pF

35693003

C302

1

Ceramic, .82

pF

52007003

C302

2

,3

Ceramic,.5pF

52007000

C303

1

Ceramic,.5pF

52007000

C303

2

,3

Ceramic, .33

pF

52007012

C304, C305

Ceramic, 100

pF

35693019

C306

Ceramic, Z5U, .001

52676101

C3071

Ceramic,

.5

pF

52007000

C307

23

Ceramic, .33

pF

52007012

C308

1

Ceramic, 1.2

pF

52007009

C308

23

Ceramic, .33

pF

52007012

C309

Ceramic, Z5U, .001 52676101

C310

Ceramic, 33 pF 35693013

C311 Ceramic, 47 pF

35693015

C312

Ceramic, Z5U, .0047

52676105

C313

1

Ceramic,.5pF

52007000

C313

2

,3

Ceramic,

.33

pF

52007012

C314-C316

Ceramic, Z5U,

.0

I

52676107

C317

Ceramic, 100

pF

723023

C318

Ceramic, .00I 102881301

C319

(Not Used)

C320

Ceramic, Z5U,

.01

52676107

C321

Ceramic, 180

pF

35693022

C322

Ceramic, 56 pF 35693016

C323

Ceramic,

68

pF

35693017

C324

Ceramic, 220

pF

35693023

C325-C327

Ceramic, Z5U,.1 52676113

C328

Ceramic,

100

pF

35693019

C329

Ceramic, Z5U, .0047

52676105

C330, C331

Ceramic, 120 pF 35693020

C332

Ceramic, Z5U,

.1

52676113

C333, C334

Electrolytic, 1.0 52723025

C335

Mylar, .015 52719058

C336

Ceramic, Z5U,

.1

52676113

C337

Mylar, .0022 52719053

C338

Mylar, .0056 52719068

C339

Ceramic, 330

pF

35693024

C340

Ceramic, Z5U, .001

52676101

C341-C369

(Not Used)

C370

Ceramic, Z5U,

.01

52676107

C371

Ceramic, 180

pF

35693022

C372

Ceramic,

50

pF 35693049

C373

Ceramic,

68

pF

35693017

C374

Ceramic, 220

pF

35693023

C375-C377

Ceramic,

Z5U,.1

52676113

C378

Ceramic, 100

pF

35693019

C379

Ceramic, Z5U, .0047 52676105

C380, C381

Ceramic, 120

pF

35693020

C382

Ceramic, Z5U,

.1

52676113

C383, C384

Electrolytic, 1.0 52723025

C385

Mylar, .015 52719058

C386

Ceramic, Z5U,

.1

52676113

C387

Mylar, .0022 52719053

C388 Mylar, .0056

52719068

C389

Ceramic, 330

pF

35693024

C390

Ceramic, Z5U, .001 52676101

C391-C419

(Not Used)

Ref

No.

Description

Part

No.

C420

Ceramic, Z5U,

.01

52676107

C421

1

Ceramic, 150

pF

35693021

C421

2

,3

Ceramic, 180 pF 35693022

C422

1

Ceramic,43pF

35693070

C422

2

,3

Ceramic, 50 pF 35693049

C423

Ceramic,

68

pF

35693017

C424 Ceramic, 220

pF

35693023

C425-C427 Ceramic, Z5U,

.1

52676113

C428

Ceramic, 100

pF

35693019

C429

Ceramic, Z5U, .0047 52676105

C430, C431 Ceramic, 120

pF

35693020

C432

Ceramic, Z5U,.1 52676113

C433, C434 Electrolytic, 1.0

52723025

C435

Mylar, .015 52719058

C436

Ceramic, Z5U,

.1

52676113

C437

Mylar, .0022 52719053 C438 Mylar, .0056 52719068 C439

Ceramic, 330 pF

35693024

C440 Ceramic, Z5U, .001

52676101

C441-C469

(Not Used)

C470

Ceramic, Z5U,

.01

52676107

C471

Ceramic, 150

pF

35693021

C472

1

Ceramic, 39 pF

35693014

C472

2

,3

Ceramic,43pF 35693070 C473

Ceramic, 68 pF

35693017

C474

Ceramic, 220 pF 35693023 C475-C477 Ceramic, Z5U,

.1

52676113

C478 Ceramic,

100

pF

35693019

C479

Ceramic, Z5U, .0047

52676105

C480, C481

Ceramic,

120

pF 35693020

C482

Ceramic, Z5U,

.1

526761 i3

C483, C484 Electrolytic,

1.0

52723025

C485 Mylar, .015

52719058

C486

Ceramic, Z5U,

.1

52676113

C487

Mylar, .0022 52719053 C488

Mylar, .0056 52719068 C489

Ceramic, 330 pF 35693024 C490

Ceramic, Z5U, .00I

52676101

VC301-VC308

Capacitor, Trinuner

723086-4

Intergrated

Circuits

U320 IC, MC3359 MOT

760494

U321

IC, NE5532 53295001 lJ370 IC, MC3359 MOT

760494

U371

IC,NE5532

53295001

lJ420

IC, MC3359 MOT 760494 U421

IC,NE5532

53295001

1I470 IC, MC3359 MOT

760494

U471

IC,

NE

5532 53295001

878662-*

Frequency *Dash No.

Reference No.

171

MHz -171

I

207 MHz -207

2

213 MHz

-213

3

3-24

PCB Receive Assembly 878662-* (Continued)

l)

Ref

No.

Description

Part

No.

Potentiometers

VR320

20KPotentiometer

57148071

VR321

50K

Potentiometer

57148072

VR370

20K

Potentiometer

57148071

VR371

50K

Potentiometer

57148072

VR420

20Kpotentiometer 57148071

VR421

50K

Potentiometer

57148072

VR470

20K

Potentiometer

57148071

VR321

50K

Potentiometer

57148072

Colls

and

Chokes

L301,L302

Coil, 2

1I2T,10mm

. 724778

L303,L304

Coil, 2 1/2

CT,10mm

724766

L305

Coil, 2

1I2T,10mm

724775

L306

Coil,2

1I4T,

114

Tap, 10

mm

724765

L307

1

Coil, TOKO, Red

723403-3

L307

2

Coil, TOKO, Brown

723403-2

L307

3

Coil, TOKO, Black

723403-1

L308

1

Inductor, .22/!H

35689047

L308

2•3

Incuctor, .15 /!H

35689041

L309

Coil, 2

112CT10

mm

724766

L310

Inductor, 56

/!H

35689020

L311, L312 Inductor,

10

/!H

35689011

L313

Coil, 2

1I4T,

114

Tap, 10

mm

724765

L314-L319

(Not Used)

L320

Inductor,

10

/!H

35689011

L321

Inductor, 3.95

/!H

724774

L322

Coil, 455 kHz, discriminator 52982000

L323

Coil, IF, 10.7 MHz 53029000

L324-L369

(Not Used)

L370

Inductor,

10

/!H

35689011

L371

Inductor, 3.95

/!H

724774

L372

Coil, 455 kHz, discriminator

52982000

L373

Coil,

IF,

10.7 MHz

53029000

L374-L419

(Not Used)

L420

Inductor,

10

/!H

35689011

L421 Inductor, 3.95

/!H

724774

L422

Coil, 455 kHz, discriminator 52982000

L423

Coil, IF,

10.7

MHz

53029000

L424-L469

(Not Used)

L470

Inductor, 10

/!H

35689011

L471

Inductor, 3.95

/!H

724774

L472

Coil, 455 kHz, discriminator

52982000

L473

Coil,

IF,

10.7 MHz

53029000

FB321

FerriteBead

56632007

FB371

Ferrite Bead

56632007

FB421

Ferrite Bead

56632007

Transistors

Q301 GAASFET, NE 25139

760392

Q302

Transitor, MPS901

760376

Q303

JFET, J309

54722000

Q320

Transistor, MPSH

10

54736000

Q321, Q322

Transistor, MPS3704 54712000

Q370

Transistor, MPSH10

54736000

Q371, Q372

Transistor, MPS3704

54712000

Q420

Transistor, MPSHIO 54736000

Q421, Q422

Transistor, MPS3704

54712000

Q470

Transistor, MPSH

10

54736000

Q471,Q472

Transistor, MPS3704 54712000

Ref

No. Description

Part

No.

Crystals

and

Filters

Crystal Filter Insulator

450471

Crystal Insulator

450474

HY301

Mixer,

ASKI

760382

Y301

1

Crystal, Receive, 171.905 MHz 780092-1

Y301

2

Crystal, Receive, 207.8

MHz

780092-2

Y301

3

Crystal, Receive, 213.8

MHz

780092-3

Y320

Crystal, Receive, 10.245 MHz 780088

Y370

1

Crystal, Receive, 12.015 MHz

780088-6

Y370

2•3

Crystal, Receive, 11.53 MHz 780088-3

Y420

1

Crystal, Receive, 12.815 MHz 780088-7

Y420

2•3

Crystal, Receive, 12.155 MHz 780088-4

Y470

1

Crystal, Receive, 12.555 MHz 780088-8

Y470

2•3

Crystal, Receive, 12.955 MHz

780088-5

CF320, CF321 Filter, 10.7 Crystal

780087-0

CF322

Filter, 455

kHz

Ceramic

723088

CF370

1

Filter, 11.56 MHz Crystal

780087-4

CF370

2•3

Filter, 11.075 MHz Crystal

780087-7

CF371

1

Filter, 11.56 MHz Crystal 780087-4

CF371

2•3

Filter, 11.075 MHz Crystal

780087-7

CF372

Filter, 455

kHz

Ceramic

723088

CF420

1

Filter, 12.36 MHz Crystal

780087-5

CF420

2

,3

Filter, 11.7 MHz Crystal 780087-2

CF421

1

Filter, 12.36 MHz Crystal

780087-5

CF421

2

,3

Filter, 11.7 MHz Crystal

780087-2

CF422

Filter, 455

kHz

Ceramic

723088

CF470

1

Filter,

13.1

MHz Crystal 780087-6

CF470

2•3

Filter,

12.5

MHz

Crystal

780087-3

CF471

1

Filter,

13.1

MHz

Crystal

780087-6

CF471

2

•

3

Filter, 12.5 MHz Crystal

780087-3

CF472

Filter, 4%% kHz, Ceramic

620088

All resistors in

ohms,

lIS

Watt,

5%,

unless noted.

Resistors

R301

lK

52154060

R302 10K

52154036

R303 33

52154096

R304

10

52154108

R305

lK

52154060

R306

150

52154301

R307

3.3K

52154048

R308, R309 10K

52154036

R310

100

52154084

R311, R312

470

52154068

R313

10K

52154036

R314

2.2K

52154052

R315

47K

52154020

R316-R319

(Not Used)

R320

I.2K

52154058

R321

220

52154076

R322

68K

52154016

R323

l.5K

52154056

R324

lK

52154060

R325

330K

52154000

R326

220K

52154004

878662-*

Frequency

*Dash No.

Reference No.

171

MHz -171

1

207 MHz -207

2

213 MHz

-213

3

3-25

PCB Receive Assembly 878662-* (Continued)

Resistors (Continued)

Ref

No. Description

Part

No.

R327

lOOK

52154012 R328 13K 52154033 R329, R330 220K 52154004 R331 100

52154084 R332-R334 10K

52154036

R335-R369

(Not Used)

R370 1.2K

52154058 R371 220

52154076 R372

68K 52154016

R373

l.5K

52154056

R374 1K

52154060 R375

330K 52154000 R376 220K 52154004 R377

lOOK

52154012

R378

13K

52154033

R379, R380

220K

52154004 R381 100 52154084 R382-R384 10K 52154036 R385-R419 (Not Used) R420

1.2K

52154058 R421 220

52154076 R422 68K 52154016 R423

1.5K

52154056

R424

IK

52154060 R425 330K 52154000 R426

220K

52154004

3-26

Ref

No. Description

Part

No.

R427

lOOK

52154012 R428 13K 52154033 R429, R430 220K

52154004 R431

100

52154084 R432-R434

10K

52154036 R435-R469 (Not Used) R470 1.2K 52154058 R471

220

52154076 R472 68K 52154016

R473

l.5K

52154056 R474

1K

52154060 R475 330K 52154000

R476 220K 52154004 R477

lOOK

52154012 R478 13K 52154033

R479, R480 220K 52154004 R481 100 52154084 R482-R484 10K

52154036

Connectors

P301 3 Pin Header

670062 P320 3 Pin Header 670062

P370 3 Pin Header 670062 P420 3 Pin Header

670062

P470 3 Pin Header

670062

(\

\ )

AUDIO BOARD

AUDIO BOARD CIRCUIT DESCRIPTION

C)

The audio board receives signals from the receive board, the headsetmicrophone, intercom input and

,auxiliary input, and outputstothe transmit board,

the headset earpiece, an external speaker, intercom out and auxiliary out (see block diagram).

Receive Expanders

Audio from the receive board is routed through Jl08, Jl09,

JllO

and

Jlll

to

U1l2

and U1l3. The gainofthese devices is controlled bytheaudio level at the rectifier pins

.(4

and' 16). As the level in-

creases,

so

does the gain, and this resultsina2:1

linear expander characteristic. This complements

the processing done in the transmitter. The audio is then buffered and delivered to the remote select switches.

MicrophoneAmplifier

From the headset connector the microphone signal is amplified by U103. Dependingupon which type of

microphone is used, S102 is set by the user

to dynamic orelectret. The electret position provides an

11dBdrop in gaintocompensate for the extra

output.

The

amplifier is

peak

limiting, and responds to either positive or negative peaks exceeding about

1.1

volts in amplitude. Peak detectors Q106 and Q107 charge C120 and C121, driving QI05 toward pinchoff. This reduces the gain momentarily until the input signal is reduced. Visual indication

of

peak limiting is provided by

D608 which is driven by U105 when the voltage at

6exceeds halfa volt. D

111

(version 3 and later)

/isolates the time constantofthe amplifier from'that

of

the LED driver. The latter is much shorter than the former, and causes the LED to extinguish immediately upon removing the input signal. On versions 1and 2 the LED will remain lit for several seconds. VR604 is adjusted by the user for maximum input with minimal limiting.

QI04isused

to tum the microphone on and offand is driven by the push-to-talk latch circuit. When

SIlO

is pressed in

and held, the state

of

Ul16Bfollows the switch and tums on Q110 and Q111 via D110. This lights D609 and gates on the microphone audio. Releasing S110 tums off the microphone.

3-27

U116A does not change state under these conditions because

C~82

is discharged when the clock is

pulsed.

If,

however, S110 is depressed twice in quick succession, C182 will be charged for the second clock pulse and this will set U116A. Now the microphone is latched on via D109 and will remain on until S110 is depressed once again, resetting U116A.

Auxiliary

Input

Amplifier

Audio from

JlOl

is attenuated and converted from balanced to single-ended by U101A. U101B, UI02A, Q101,

QI02

and

QI03

form a peak limiting amplifier identical to that described for the microphone above. S

101

not only enables the

audio path for the auxiliary input but also lights

D607

to

half-brilliancetoindicate active auxiliary. When peak limiting occurs U105Ashorts out R120 and D607 is brought

to

full brilliance.

Intercom Driver

UI07

A is configured as an AC current source

whose output

CUlTent

equals the input voltage at

C125 divided by the value

of

R158. Thus the

voltage gain is dependent on the value

of

the load.

In this way many such intercom stations can be

connected in parallel without each successive sta-

tion loading the line. A single load resistor is usually located in the power supply for the wired intercom. On versions 3 and later, UI07B is used to

drive the lower end

ofTIOl.

This section is not a current source and was added to provide more headroom.

To

this end, U107 is operated from the

higher voltage ahead

of

the regulator. S104 is a 9

section

DIP

switch which is used to configure the base for compatability with a specific wired intercom. S103 functions as either

an

intercom onloff

switch.(Telex, Clearcom standard) or as a channel

AlB switch (RTS, Clem'com TW). In the case where the intercom interface is disconnected by

S103, R186 functions as the load resistor. The full secondary

ofTlOl

is used for 300 ohm intercoms; the tap is used for 200 ohm systems. On version 2 and later, S

112

allows selectionofeitherlow output

(100 mY) or high output (800 mY).

Intercom

Input

Since U107A is a current source, signals arriving from an external intercom appear unloaded at pin

1and are coupled via C126 and R154

to

U106.

To

prevent intercom output signals from appearing at

the output

of

U106, these signals are nulled by the

branch

containing

C124,

VRlOl

and

R152. U106A and U109 form a peak limiting amplifier similiar

to

that described for the microphone

amplifier above, except that

CA10l

is used instead

of

a JFET to control the gain. The reason for this is that the higher level signals being handled by U106Awould cause high distortion

if

a JFET were

used.

CA10l

is merely an LDR (light dependent resistor) together with an LED in the same package. More current through the LED reduces the value

of

resistance.

Headset

and

Speaker

Amplifiers

U

111

and

Ul19B

(U107B in versions 1and2)drive

the headset while U108 drives the external speaker

jack. On versions 1 and 2 this signal was derived

by mixing the microphone signal with the intercom

output, via R175 and R177. On later versions the intercom output alone is used, being first amplified

by U119A. S112B maintains the headset/speaker level constant when switching intercom output

levels.

Transmit

Mixer

and

Filter

U106B mixes the intercom input, auxiliary input, microphone and receive board signals together

to modulate the transmitter. VR102 is usedtoset the level going into the transmit compressor for proper tracking. On versions 3 and later, U

118

acts as a four pole Chebyshev low pass filter with a cutoff frequency

of

5 KHz. This istoprevent transmis-

sion

of

the 20 KHz tone which Telex intercoms use

as the call signal.

3-28

Auxiliary

Output

UllOA

mixes

together

intercom

input,

microphone, and receive board signals. U11OB

inverts the resultanttoprovide a balanced output.

Remote Transmit Circuit

When the transmit switch on the rear panelisinthe remote position, the transmitter will only operate when at least one receive squelch is open. On

versions 1 through 4 this is done with

Ul15

which turns on Q109. Versions 3 and 4 have a circuit board error, however, which prevents this option

from working.

To

correct this move the inputs

of

Ul15tothe left side (on the schematic)ofR195,

R198,

R20l,

and R204. The version 3 and 4

schematics show these inputs

as

they are un-

modified, that is, connected

to

the right sideofthe

resistors. On versions 5 and above, U

115

is

replaced with

Ql12,

Ql13,

Ql14

and

Ql15

and

no

modifications are necessary.

Power Supply

Q108 and U114 form a

10

volt regulated power

supply.

On

versions 1 and2,ZD101 is usedasthe

5 volt reference while on later versions this comes

from U

117.

U112 and U

113

are also supplied

by

U1l7.

ALIGNMENT PROCEDURE:

)

Equipment Required:

D Signal Generator D Audio Generator D Deviation Meter D Audio Voltmeter

1.

Connect the audio generator to the AUX

IN

jack

and set the outputto20 mV at 1

KHz.

2.

Select the AUX pushbutton on

therront

panel.

3.

Adjust VR601 (located just under the

I1C

push-

button

on

the

front

panel)

to

maximum

coun terclockwise.

4.

If

the base is configured

for

an RTS intercom

connect the load

to

the

llC

jack pn the rear

panel.

5.

Connect the audio voltmeter to the AUX OUT

0

jack on

the

rear panel.

6.

Adjust VR101 for a minimum reading.

7.

Disconnect the generator and meter from the AUX jacks and de-select the AUX pushbutton on the front panel.

8.

Connect the signal generator to the Receive Antennajack. Set the deviation to

±3 KHz at

1

KHz.

Setthe output to 1mV.Setthefrequencyto thechannel 1 frequency listed in the chart of

the receive board alignment.

-

I

9.

Select the channel 1 pushbutton on the front panel.

10.

Connect

the

deviation

meter

to the

ANT

TRANS jack.

11.

Connect the audio voltmeter to U106 pin

7.

12A. On version 1 and 2 audio boards, adjust VR102

for

300 mV

of

audio.

12B. On version

3 and later audio boards with ver-

sion 1 transmit boards, adjust VR102 for 1 volt of

audio.

12C. On version

3 and later audio boards with ver-

sion 2 transmit boards, first move the audio voltmeter to

U501 pin 16 (on the transmit

board). Then adjust VR102 for 140 mV

of

audio.

13. Adjust VR501 for

±4.2 KHz deviation.

3-29/3-30 Blank

RECEIVER

1-1EXPANDER

I--"~

__

---------,

>--+

AUXOUT

RECEIVER

2

-1

EXPANDER

I---"~

__

--""

BALANCE

INTERCOM

GAIN

~

TRANSMIT

OUT

INTERCOM

T

RS

HIGH/LOW

(ON

VERSION2ONLy)

RECEIVER

3

-1

EXPANDER

I---"~

__

------+I

RECEIVER

4

-1

EXPANDER

IC---....~

__

-.J

o

DYNAMIC/

ELECTRET

HEADSET

_~~

....

I.4ICROPHONE

....

AUXIN

MIC

GAIN

~

T

>---\-------11>

SPEAKER

Figure

19

Block

Diagram

Versions 1

and

2

3-31

RECEIVER

1

---1

EXPANDER

I--"~

..

--------

AUX

OUT

RECEIVER

2

---1

EXPANDER

I

BALANCE

INTERCOM

GAIN

~

TRANSMIT

OUT

HEADSET

INTERCOM

---------

...~SPEAKER

RS

HIGH/LOW

~_------toI

AUX

IN

DYNAMIC/

ELECTRET

AUX

GAIN

~

RECENER

3

---1

EXPANDER

I

RECEIVER

4

---1

EXPANDER

I--"'~--"'/

HEADSET

MICROPHONE

Figure 20

Block Diagram Versions 3 thru 6

3-32

o

S110

o

J112

R211

<:>

R212

<:>

O~O

o 0

o a

UllS

S111

,.........e...,S102

L--J

Jl01

Rl22

<>

C'l

0

0::

...

u

0109

0

~

li1aaaal

Cl11 0

13

""""""

P114

C101

Cl02L101

CISI

~

0(\

<D+~

0000

R192

'"

~

i'"

R172

C150+

Ul11~

~

Ul0l

Rl030~OOR10l

0 1

..

0

O:! 0

<>0

0

aooo

Cl53

....

000

'"

R17.

;;t

0 0

:0

<:>

0 0 0 0 0

0'"

O

Rl99

liDo 0 0

flRlos

0

a-

C1SS

Rl88

0 a

ov·",

6

06

~.

Ul10

ll:

Cl03

!:!o

-c:>-

o!+

C1520+

07 Rl04

'"

~

1~119

r-)+

6

(]

FfrrS

dJC123

Qf{

§

~ ~

'i:r'

Cl20

C121

~C~

g18iQl04

Cl0S~OO

0cJ"O~u

::D~O(]

O~

(\

<>

0000IR141

~

H114

0102~Ul0S . ,

-c:>-

R1060 V

C108

CD

~o:

~

R221

Rl17

(]

0 0

<:>

OR136

-c:>-

<:>

0 0 R137

-c:>-

Ql03

00

C1180

OC+1l7

r'\R220

Rl48 R147

mrt

Q10SV

R219

R1340

D

-¢>

~o

OR217

:

~

:JI:

?r\

C1370 U D 0

1L6-

R

~0109

Rl~

0:

i

1l0~

0

<:>

D

~!:!

I

Rl~:

l.:!~

0108

U~118

R201

Pl03

0 0

~~~

:

C18300

0

R2040

b

-c:>-

0 0

R216

0

: :

C182

+ 0 0

C184

R18S

:8

R119

Rl07 D

R1060

0

~

a a

Q]

R1S0

D

CA101

-c:>-

a

R1530 a

R151

: OR222

lilCii-C:>-

III

0

:;;::;;:

oooa

Pl02

«

_0

00QU106

~O

Eg

+0

Rl~63

(jRl02

- o

...

~

Rl90

'"

C131

~

<:>

o

<:>

R162

-c:>-

RIM

R12S

<:>

~~R167

000

<>

CllS

\.AJ

0 0

o

C18S/l0:3

0 0

0000

Rl88Y

iC

°

aU109

"'O~Ul04

Rl111

0

..

L-.....J

<:>

R17S

a;:

aooo

Cl540

R128 +

00

~

cm

R129

Cl22+

o

O

R133

~O~OsO~O

R20S

b

O~

bO~

...

o 0 0

<:>

C172

C174

C178

o

;

JIll

Jl04

C18

<:)

C1S8

C181

~

+0

0+

C17~

0 0

Co

o 0 : ...

r'Yt"

: 0

V 0 o

...

C17S

Cl77

0 0 0

o a

O

0

U113

0

C167

R200

R203

C1l4

R121

0

R1180

<:>

i-

0000

...

SCJ

OR124

Cll80

:;

a~W70

g Rl12

<:>

o

~

J110

o

"'0

C149

a~o

o

·0

o 0

o 0 o 0

Sl04

J10S

C1S9

~

:+0

0

+

C188 0 0 C164

C1800"':

0u

.0 a

o

:

OR194

T C173 0

0+

0

o 0

O

0 n

C171

R197 0

U112

Cl63

;

Jl09

VAl01

C126~R1S2

SEE

101

+=

c::J

R1S9

<>Rl54

FIGURE :(J

U107:r

am

25

'Kg'

*l)

aoo

CiS

"0

DETAIL

A~V

10

0

~:

:

o!Q

Cl40

1£1~

£!:!J

....

:! 0 0

<:>

RIse..()

R1711

U

<>

SEE

Rm

FIGURE 25

DETAILB.............

~---~---l

C128 I L I

G

R1S8

I 0

II~

"'c::J

I _

OCl30

I I 1101

1111:0

R178

R;l.§Z.:;

I 0~I

<>

~

~33

VI

~3)u

L~~l

0

1

C144 C145

Ul08 0 q

o

SlO9

(aanaaaaaaal

R1840

sOOOQ181

C143 C142

o

c:::J

OORl82

C148

Cl48

o

1')

o

Figure21

S'd

)

t (Component

I eA dio

Board

Component

Layou

u Versions 1

and

2

3-33

o

Figure 22

Audio Board Component Layout (Foil Side)

Versions 1

and

2

3-34

o

i

R'69

I

10K

i

R170

U110:A

R171

e150

'OK

......

NE5532

·10UF

330

~r68

[5

.~

68K

R,'6: :

AUX

OUT

I~R17J

8

10K

R174

C151 •

• - 7

330

l~UF

T

~~110:B

NE55J2

TRANSMIT

R162

R163

AUDIO

LEVEL

2.2K

10K

~~

R161

......

I.Y

,'I

3DK

.- ,

Ul~:O

NE55J2

RECEIVE

BOARD

J113

I--<

--<

REMOTE

5111

Orf

*-

CONT

R'BS

3,6K

r-

D60;J

:~:INTERCOM

J

IOV£RLOAD

.gJ:~F

L _ _

-l

INDICATOR

R190

10K

R'BS

lOOK

U109:8 r

LM,;'92j·.,.,

•

I

R1~

4,OK

PORTABLE

3

SELECT

e175

C176

R132

tOUF

5107

lour

6SK

3

lR~~~

-R202T

•

1OOK1'OOKl

""f Y

C)

NOTE:

COMPONENTSINDASH

BORDER AREAS ARE LOCATED

ON

THE DISPLAY BOARD.

:

-f.

~:

I

;.-0'

I

L

__

.J

Example

el03

.0022UF

0110

lN4148

HEADSET

SPEAKER

R'88

B.OK

R189

•

68K

I~15jr

C152 +

'7

IUr

t

C'3.

,urI

...

Figure 23

Schematic Diagram Audio Board

Version 1

R221

10K

Dl09

R220

lN4146

5.1K

R216

~

Q110

0111

MPS3704

IdPSJ704

R219

...

R217

l.OK

10K

-

D6091

I I

~

I

...

I

TALK:

I

I - I

L"'::

__

.J

R211

lOOK

.,r

~01J

,

r-:l

D

S g

Q'f~'+--1~-+-"".I'--!I--~

:~'~:::i

'

~

~C

:

JOOK

.. 7

lN

D!,0~8

R213

-:::"='C184-

r-

__

__j-----1T~TI---v'VDKIr1'__j

H'~

.

It

R214

R216

c,'~iI

470K

10K

...

r.-r

~~R-2~'2-----'8

~~~g:B

S110

11'OOK

9

0

S

Q 13

TAlK

.. C a

1')

~

lo--------l<I

LY-

3-35

NOTE:

COMPONENTSINDASH BORDER AREAS ARE LOCATED ON THE DISPLAY BOARD.

r-t-I

I

_I

I

-I

L

__

.J

Example

RECEIVE

BOARD

J113

Cl04

.1UF

R222

lK

r-

---I

I

DBOl

I

I ~ I

I

~~E~.1

REMOTE

5111

orr

~

CONT

HEADSET

SPfAI<ER

R1B5

3.61<

R209

16.9K

o;~

'"iINTERCOM

,..

1

OVERLOAD

_

-I

INDICATOR

F101

POWER

'~N:~'

1~::'

lAm.

=Vcif~,

~

r"N'--.------___.--,

510.

-+

---.....--.--,--<1'

~

01O~¥'~1

~C180'~C179

R206 8

TlPJO

R207 I .1UF r 2200UF

16.2K

n

~_L..;l...LI::

;;.:rU;;-l1t'~--j'lt--!-----J

~

I 1

~~~641~~gg4

't

·"'1

LM35B

1~'20.

L-------.-1,C~,7B7,------J

Z~01~

r·01~

1N4733

7

r-

I I

C191

1

.D01UF

L_

R190

'OK

"

J;C161

I

'u

,

T

R165 100K

~~:~~~9

IC155

C152 + T 4.7UF 1UF

:+

R181

51

I

R1,~

4,OK

R187 47K

'}~•

U109:A

C132

J!~

It

R16

'

--LI:

>-"--

LM3.2

1UFr1M

+

V"1

R187

I +

'="

R191_6.8K

C185 I C154 I

620

'1

10UFI10UF

T _ "7

"f

T

C141

J!

470UFI

T

R160 C1J1 0102

10K

lUF lN4146

,

l~~~;Bt

R169

10K

R170

Ul10:A

0150

10K

?

"NESS32

R171

!~

-"

330

R168

Q

6BK

10K

'

AUX

OUT

I~R173

C151 7"

o 10K

R174

- 7

330

lR~F

T

+

U110:B

NE55J2

INTERCOM

GAlN

R162

9.1K

EXTERNAL SPfAI<ER

VOLUME

CAl01

~

(

\\

VR103

+-

-J+--"~OOK

C144

:$.

.1UF

A 1

~

C143

EXTERNAL

l~

~+-""""'"3?:~

220U,

SPfAI<ER

_

+~J106

C;45T

- 6

,lR162

C142 I

100UQ

U106 R183 1 470UF '1

'T

LM2895T181<+C14B

h ,

I

J!C156

1-----1f-"

l'W'

I'70U'

R184

01

1

47

~

200 JJOPF Ul11

~~CJ4119

C140 I

rl>-.-I!!-,

Rl.3

Pl,.

!

..

?UF

311

13;".J

1

lLII,,'°;e-_-<

"

J~

5JrR"',".!'2--'--<

2~

10

I +16153100PF

T

R179

R180

22K

'OOK

C13B

!!

lU'I

T

HEADSET SPEAKER

VOLUME

~C14B

r---

-I

C136

R17B

1

10ur

1 \!R60J 1

.1~F

1M

ot

r-.

6~~glj~

T

I

lOOK

~+IF-~>:cU~7'

__

_J

I I C137 - C13.1 L_ _ _

_I

220PFI

220PF!

T+--'\i¥-----l

TRANSMIT

AUDIO

lEVEL

~~~3

'rdk3i

J112

,---------------"IV'--I,-

~~-.\.\-~~11-T

,"'1\,

,_,,-+IB-N,.,(h,

.'1

~

TRANSMIT

+-1-

-j~__-'L.j,,//>-7L~

1--------------------_1_-1-1--<

BOARD

U1'66:8 NE5532

R121~

10K

f

NE~53r-:

Is

C114~

R124

---:-1:~

10UFI13K

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I-""~-l

15

,1:

18K

CI1a.,.OIU£, 0107

~

.J.-!.!.

RL~

R137

D111

Ql06

MPS3702

W

~~4

(~4.7M

4.7M

1N4148

MPSJ702

~

.

RI38:i

~C121

.

1"C210

01DS

47K\1'UF

I·D1UF

,

JI77

R236

C120

+ R,'39

1M

.,

lOUF~

,111

Figure

31

Schematic

Diagram

Audio

Board

Version 5

H£AIlSEI'

SP£"AI<ER

n.

RIllS

~

8.8K

TCI55

C152

.....

4.7UF

lUF+

CI38 •

lUF+

HEADSET

SPfAKER VOlUIIE

CI48

,--

-T~W

~~8'"~,UI19:B

r

our

'I

~·$4t!·..:.::·~±_=~::::J·r)~;-~;-~2-:......J

1

__

1

J~~+

';;:--;

i~

RI80

~~

221<

RI21~'02:B

10K

NEM32

.1>.

C114:!!

R124

~~

lDOUF+ 13K

IV

0110

~

lN4148

~M'

0109

R22D

lN4148

5.1K

~.18

~

)~"D

0111

IIPS3704

UPS3704

R219

R217

1.!<_

~-:

10K

I

1

"'"'

·1

TAU<

,

L

__J

3-43

RECEIVE

BOARD

NOTE:

COMPONENTSINDASH BORDER AREAS ARE LOCATED ON THE DISPLAY BOARD.

r-f.-

I

_I

I

-I

L

__

.J

Example

J113

R222

IK

U117

T

78~05

C194

.t

.1UF~

,2

1~~'034

10~4

l~l~+~JreF

~

~09

'"

Ql~~)+-

~F-~C..~I~---.1-t-7.Cl=79-<

T1P~

't'"

R;~7

T.

lUFT22DOUF

..

'+'

0104 D1o:l

0107 lN4004 lN4004

1N4004

J:C1ft7

+.01UF

REMmE

SIll

OFF

..-

com

~U114

R209

~

I'

It.4358

lUK

+

HEADSET SPEAKER

R206

16.2K

AUX

OUT

RI65

J,6K

R190

._

10K

r 060;;1

I

/.

IINTERCOM

Cl0l

I ;-",

OVERLOAD

.001UF_ _-'INOIQATOR

"-

--U:~:A

'"

1+

LM392

R191

...

1.3K

~C1Bl

t

lUF

RI65 lOOK

R166 294

~4:9

{V'

1~~~:'

~Wl

C

l

'81

t

~ ~

~~64

C18~~+C154T

10UFtlOUF+-

RI63

TRANSMIT

10K=AUDIO

LEVEL

Y

.8Jf8F

Cl48

t

10UF

EXTERNAl SPEAKER

1

~R182

C1~108

1

47~F

+

C14tJ

I.cuse

l----_-ll-..J

llUF

T~7OUF

R184

;;'1~7

'"

200 330PF

Ulll

~~4110

C140 rl>-.-I!-.

R193

Pl14

4.7UF

3 I

~

d [ Il...o\l,,0r-_-<

II

4

~

5Jr-'~VI!191'-2"---<

2m~:

R226

47

II

,+C205

t

'OOUF

R158 C1JJ

160

22UF

Rlh9

10K

R162

3.9K

R176

1M

CAl01

~

(

\\

R156

~M'~

lOOK

+C128

+.,UF

C206 + 1UF+

R231

~~2

20K

C1301

27PF~

HE:AOSEl'

SP£AJ<ER

VOLUIoI£

1---,

C138

R178

U119:B

I

VRl103

l·

lUF

1M

~

1001<

I

N~2

,

C137·

+.....

CI391

'----'220P!'t

~;;

220Pt

RlllO

~~

22K

C209

lUf

+

R 5

39K

51~B

CI38

~

1UF:+:

R233

CI41-J!-

16K

470UFT

C'35

lOP!'

'"

."

~

IJ~~

~

C~~7

ri:::U>-I..J19-:A~.tJ

"f--o----EXTER--NAl--l-.:;

C144 Ul08

1

UF•NE5532

SPEAKER'1UF

It.4363

VOLUME

+5--

-ll'--nLf:N.:

R229 R234 lOOK lOOK

C212

lOP!'

Ull0:A

R171

Cl50

"NE.5532 330

10UF

~·:>-'4--¥.f'o--'jffiJl03

r-

-l-_-IU~::::'lJ1(~¢";R"I~73i1

. a

10K

R174

C151

..

,330

10UF

~

~1~2

R121~

10K f

NE~~III

C114:!!

R124

--:-i:>-z.-

l00UFt13K

IV

r-

R126

R125

4.7K

5112:A

'OK

INTERCOM

C115

OUTPUT

Ul04:A

l00PF

R237 lEVEL

NE5532

J.~O

..li..,

4f

' " '

R~O~

~~

R.~~8

;O{

~

lK

R23

NES532

160

10K

R131

4.7K

R150

lK

R133

t

4.7K

R151

lK

R152

3K

AUX

SELECT

~

R147

~o~:~

160K

\.2-

.-

--

R116

10K

R112

Ul02:A

R119

10K

"NE5532

4f=

-

3.3K

;~1~~

1--

--

---,

1

O~

06071

R118

~

1

R117

16K

I

MIC

AUX

I

'5K

1-

--

_J

~~6~0

OVERLOAD INDICATORS

~.

+ U105:8

It.4393

MPSJ702

.

"-

-'--

FiUl05:A

11120

R146

4 LM393

10K

4.3K

PORTABLE

2

U112:0 C173

SELECT

C174

"..-NE575"

10UF

51~

10UF

~IR~~~~199r~

100K.,I,'OOK

T T

R113

16K

0110

r-

lN4148

~~1

0'09

R220

lN4148

5.1K

R:!;6

~

Qll0

Qlll

MPS3704

R219

R217

l.BK

10K

r

ii6091

,,

~I

1

TALK

I

1

L

__

...J

~

C105 +

Cl06

Rl09

~K

lUF

l---+-.0~1!~IUI_F---'4J.7JM~

Rll0

0112 ( Ql02

Rl0B

~

l4.7M

lN4ija

MPS3702

10K

'!=?QIOI

Rl1:J

~Cl09

•

,1

+ J177

47K11UF

R236

T?8/JF

Cl08

+ '#

1M

y"

R115

10U,+

,,/1.1

Cl01

2,2UF

~.\8~

lif0'4

AU

J

X 10

'N

l

r,-+-j~4''::lVH~.2K

Ul01:B

R102

- +

II

NE~532

.u

2.2K

+ 101:A

>-'-.----------l--~-+__'\N__I-l-ll'_r_"

'NE553

- Cl04

~~~;=;

~~~~

:~;

;.~~5

AU~

';1"1!PF

Rl06

lViiOO2O>'

3.0K

Rl07

'_':f:.ol>l...!

100

U116:8

~4(

JJ

tR~·4013!~

(F:

8

.r

~::'~..

:ir~'F!

~S~8

:I--'-+.---t'!-+"IY'-t--,.-,

I

-lOOK

4 7

1

l>-----__¥'

0108

~

lN4248

R21ilK

:-t~

R211

C18'tf

R214

R218

'OOK

lUF",

470K

10K

CI03

.0022UF

U112:A

Ii

±C163

NE575

I'

I 100PF

PORTABLE

1

C159~OK...

10K

I.,

T

SELECT

10~F

~

I

r..::::.

1 U'12:B

C171

C172

R130

J,09

r-,>--::Rl:-:~:-5-M-PS3---;;~;-;I;;;;~2--------I-----':.l+

rH

3.9K8~

V

i'

~S.2h~I'U~F--'lJ4.,,7K,-_-,

*rJe~~~~~~~

/?

'1

I'

C165

100Kl

'00K

l

PORTABLE

1~_

00051

!-'N--g\!),

MPS3702

~L~4

+ T

~

lOOUF

T T

1~I Ql09

U112:C

I I

1 PI I

NE575

7 7

1 ,

~~

I J

10UF~

10K

I"

Jl06>-

r-,-R-,1-K96-M=PS3=-=:~=6Y7\C:3=--H----if-------...ijHi..l

3.9Kf

l[5

I"

I~~~

~

I

ORTABLE

2

T

'

Ff

C166

+

+,-

06041

lUF

I

1 ~ I

U113:A

Ii

C167

:

P2,

NE575

...

I'

I l00PF

PORTABLE

3

1__;

__

I

C16l~0K

&

10K

I.

...

UI13,B

SELECT

>-

-=-7:=:c'-_HI-

+-

~It.j0U~F...,

~

[I'----

I.

::E575

C175 C176

R132

JIll

>---j

R201

Ql1~

3.9K""

V 1

~

1~~F

51~r'0~UF-J41!'.70K--

..

I

C~:I..hMPS3704

'-'~1I''------'I~~~~~~~

...

"IT

lou1

~

C169

".+'

DRTABLE

J

'1-

D603t

1L'}8i

T T

lOOUF

1

~l

~~~~;

...

+

, I

"",,---=,.-,

PORTABLE

4

I

C162~OK

10K

I....

U113'O

SELECT

I

__

J

10UF

"~;

lt5

I.

[ N 575 CI77

C176

,>-

>---j-:-:R::20:-:4-':'=":Q:-:l::;~5';:--+,.-J+----I------'l"1H

Kr.~

, I ,

...

E

10UF

5106

10UF

JllOlKMPS370

3.0K

'-'r'

I

~"

IR;~~-tR205rl'---'VV'---+

I

C202,/;

I

lOOK lOOK

:t"

10UFf

DATABLE

4 Y

1

_

~n

~~tO

1L~OI+

•

1

~I

9~~~

1

~

I

...

l~rF

1 1

~--------r----+

~~44

C160

R)n--crol

Cl11

Ul03:A

10K

H~;-r;':

4.7UF

5~6~OO

'~:~:~~

~~~r?CI16

Cl10

~Rl1JO~

'1~'

--'-

~+10N

...

'~.~;:~2

.~~~2

MICIN51020l00PFlR123

~C

.IUF +

~.

~

C123

R!29

C112

y2,2K

1l47PF

R135

+

.1UF

10K

~

~~~4

Et'OOPF

C117H!f-V1\M,pI~£.;):'jl,'ltI1Ir-1N+--J

560

~1

~1~21+lQ_Jl_~_i

~-:';:'M~1t5

~

-l22U~~

,..:LOO_iLI

r

'1~6

I-!C'1'~'6~~.0!lI'9U·W'"-.RI37

0111 Ql06 Ql07

A\'

R134 i

~\te:

....

71.4

lN4148

I.IPS3702 MPS3702

~

10K

R13:i

"gC121

'±C21O

~~~~

47K

11UF

R235

t,OlUF

0120 +

R;39

1M

"'f

10UFl

"i"

1M

..-

Figure

32

Schematic

Diagram

Audio

Board

Version 6

3-44

PCB Audio Assembly,(878520) Versions 1 thru 6

(j

o

Ref

No.

Description

Part

No.

IPCB100nOO

Printed CircuitBoard, Audio

70723000

Capacitors

AU

capacitorsinmicrofarads

unless noted.

Ref

No.

Description

Part

No.

C101, C102

Electrolytic, 2.2

51821107

CI03

Poly film, .0022

52719053

CI04

Ceramic, 100

pF

35693019

CI05

Electrolytic, 1

51821106

C106

Ceramic, .01

52676107

C107

Electrolytic,

.1

51821065

C108

Electrolytic, 10

52723008

C109

Electrolytic, 1

51821106

ClIO

Electrolytic,

.1

51821065

Cll1

Electrolytic, 1

51821106

C112, C113

Ceramic, 100

pF

35693019

C114

Electrolytic,

100

52723004

C115

Ceramic, 100

pF

35693019

C116

Ceramic, 47 pF

35693015

C117

Electrolytic, 22

52723009

C118

Ceramic, .01

52676107

C119

Electrolytic,

.1

51821065

C120

Electrolytic, 10

527~008

Cl21

Electrolytic, 1

51821106

C122, C123 Electrolytic,

.1

51821065

C124

Electrolytic, .47

51821105

CI25, C126

Electrolytic, 1

51821106

C127

Ceramic, 100

pF

35693019

C128

Electrolytic,

.1

51821065

C129

1

,2

Ceramic, 100 pF

35693019

C129

3

-6

Ceramic, 1000 pF

35693030

Cl30

1

,2

Ceramic, 100

pF

35693019

Cl30

3

-

6

Ceramic, 27 pF

35693012

Cl31lC132

Electrolytic, 1

51821106

Cl33

,2

Electrolytic, 10

52723008

C133

3

-

6

Electrolytic, 22·

52723009

C134 .

Electrolytic,

.1

51821065

Cl35

1

,2

Ceramic, .01

52676107

C135

3

-

6

Ceramic,10pF

35693007

C136

Ceramic,

.1

52676113

Cl37

Ceramic, 220 pF

35693023

C138

Electrolytic, 1

51821106

Cl39

Ceramic, 220

pF

35693023

C140

Electrolytic, 4.7

51821109

C141

l

C142

Electrolytic, 470

51821071

C143

-5

Electrolytic, 220

51821525

C143

6

(Not Used)

CI44

Ceramic,

.1

52676113

C145

1

-

5

Electrolytic, 100

51821524

Cl45

6

(Not Used)

C146

1

-

5

Electrolytic,

.1

51821065

Cl46

6

Ceramic,

.1

52676113

C147

Ceramic, 330 pF,

35693024

C148

Electrolytic, 10

52723008

Cl49

Electrolytic, 22,63WV

51821538

C150,

C15L

Electrolytic,

10

52723008

CL52

ELectrolytic, 1

51821106

C153

Ceramic, 100 pF

35693019

C154

Electrolytic,

10

52723008

C155

Electrolytic, 4.7

51821109

C156

Electrolytic, 470

51821071

C157,

Cl58

Ceramic, .001

52676101

Ref

No.

Description

Part

No.

C159cCl62

Electrolytic, 10 52723008

C163

Ceramic, 100 pF 35693019

C164

Electrolytic, 1.0 52723025

C165

Electrolytic, 100

52723004

C166

Electrolytic, 1.0

52723025

C167

Ceramic, 100

pF

35693019

C168

Electrolytic, 1.0

52723025

C169

Electrolytic, 100

52723004

C170

Electrolytic, 1.0

52723025

Cl71-C178

Electrolytic, 10

52723008

C179

Electrolytic, 2200, 35WV

51821232

C180

Electrolytic,

.1

51821065

C181, C182

Electrolytic, 1

51821106

C183

Ceramic,

.01

52676107

C184

Electrolytic, 1

51821106

C185

Electrolytic, 10

52723008

C186

1

C187

Ceramic,

.01

52676107

C188

,2

Poly Film, .018

52719183

C188

3

-

6

(Not Used)

C189

1

,2

(Not Used)

C189

3

-

6

Electrolytic, 4.7

51821109

C190

(Not Used)

Cl91

Ceramic, .001

52676101

C192

(Not Used)

C193

1

,2

Ceramic,

.1

52676113

C193

3

-

6

(Not Used)

Cl94

Ceramic,

.1

52676113

CI95-C213

1

,2

(Not Used)

C195%

Poly film, .015

52719008

C196

3

-

6

Poly film, .0015

52719052

C197

3-6

Ceramic, 560

pF

35693027

C198

3-6

Ceramic, 820 pF

35693029

CI99-C202

3

-

6

Electrolytic, 10

52723008

C203

2-6

Electrolytic, 100, 50v

51821115

C204

3-6

Electrolytic, 100

51821524

C205

3-6

Electrolytic, 100, 50v

51821115

C206-C209

3-6

Electrolytic, 1.0

52723025

C210, C211

3-6

Ceramic, .01

52676107

C212,

C2l3

3-6

Ceramic, 10

pF

35693007

Diodes

andLEDs

CA10l

Diode, Photoelectric,

VTL5Cl

58693001

D101, D102

Diode, IN4148

52228000

D103-Dl07

Diode, IN4004

85759002

DI08_DlI0

1

,2

Diode, IN4148

52228000

DI08_D112

3

-

6

Diode, 1N4148

52228000

Intergrated

Circuits

UlOI-Ul04

ICNE5532AN

53295001

U105

ICLM393

53284000

U106

1

U107

ICNE5532AN

53295001

Ul08

-5

ICLM2895P

760381

U108

6

LM383

UlO9

ICLM392

59521000

U110

ICNE5532AN

53295001

Ulll

IC MC34119P

760374-1

U112, U113

It

NE575N

53277003

U114

ICLM358

53227004

U1l5

1-4

IC

CMOS 4002

53266003

U1l5

5

,6

(Not Used)

U1l6

IC CMOS 4013B

53266095

U117

IC78L05

54680005

U118, U119

1

,2

(Not Used)

U118, U119

3

-

6

ICNE5532AN

53295001

3-45

PCB Audio Assembly (878520) Versions 1

thru

6 Continued

Ref

No.

Description

Part

No.

Connectors

1101

Connector, 3 Pin, XLR Female 59893001

1102

(Not Used)

1103

Connector, 3 Pin, XLR Male 59892001 1104 Connector,3 Pin, XLR Female 59893001 1105 Connector, 3 Pin, XLR Male 59892001 1106

Jack, speaker, 1/4" phone 53326000 1107 Jack, power, 2.1

mm

59697001

1108-1113

Socket, 3 pin 640064 P102, P103 Header,

11

pin 670061

P114

Header, 5 pin 52263005

Coils

and

Chokes

LlOl

Inductor, 1.2

mh

35689000

Transistors

Q101 Transistor, 1177 54687003 Q102, Q103 Transistor, MPS-3702 54713000 Q104, Q105

Transistor, 1177 54687003 Q106, Q107 Transistor, MPS-3702

54713000

Q108

Transistor, TIP-30 760384 Q109

Transistor, MPS-3702 54713000 Q110,

Qll1

Transistor, MPS-3704 54712000 Ql12-Ql15'-4

(Not Used)

Ql12-Ql15

5.6

Transistor,2N4124 35573000

Miscellaneous

FlOl

Fuse

710081

FC101, FC102 Fuse Holder 710082

All resistors in ohms, 1/8

watt,5%unless noted.

Resistors

& Potentiometers

R101'-3

82K

52154014

RlO14-

6

200K

52154005

R102 2.2K

52154052

RI03'-3

82K 52154014

R1034-

6

200K 52154005

R104, R105

2.2K

52154052

R106 3.9K

52154046

R107

100 52154084

R108 10K

52154036

R109,

RllO

4.7M 52154972

RIll

15K 52154032

R112

10K 52154036

RI13'·2

22K

52154028

R

113

3-6

18K

52154030

R114 47K

52154020

R115

1M

52154988

RI16'·2

3.9K

52154046

R1163.

6

10K 52154036

R117 15K

52154032

RI18'·2

22K

52154028

R1183-

6

18K

52154030

R119 3.3K

52154048 R120 4.3K 52154045 R121 10K 52154036 R122 5.6K

52154042 R123 2.2K

52154052 R124 13K

52154033 R125'

10K

52154036 R125

2

39K

52154022 R125

3

6.2K

52154041 R

125

4-6

4.7K

52154044

Ref

No. Description

Part

No.

R126 10K 52154036 R1271.

2

82K

52154014

R1273-

6

10K 52154036 R128 10K 52154036 R129

12

82K

52154014

R1293-

6

10K 52154036 R130-133

'.2

68K 52154016

R130-133

3

UK R130_1334-6

4.7K 52154044

R134 10K

52154036 R135 560 52154066 R136, R137

4.7M

52154972 R138 47K 52154020 R139, R140

1M 52154988

R141 10K 52154036 R1421,2

22K 52154028

R1423-

6

18K 52154030

R143

15K 52154032

RI441,2

3.9K

52154046

RI44

3-6

10K

52154036

R1451.

2

22K

52154028

R1453-

6

18K

52154030

R146

15K 52154032

R147

180K 52154006

R148, R149

10K 52154036

R150, R151

lK

52154060

R152

3K

52154049

R153 10K

52154036

R1541•

2

12K 52154034

R154

3

5.6K 52154042

R1544-

6

8.2K 52154038

R155-R157

150K,

1%

54046150

R158'

330

52154072

R1582-

6

160

52154079

R159

150K,I%

54046150

R160 10K

52154036 RI61'·2

30K

52154025

R1613-

6

15K 52154032

R162'

2.2K

52154052

R1622.

3

9.1K

52154037

R1624-

6

3.9K

52154046

R163 10K

52154036

R164

1M

52154988

R165

lOOK

52154012 R166 470K 52154996 R167 47K

52154020 R168'-3

68K

52154016 R

168

4-6

15K

52154032

R169 10K

52154036 R170'-2

10K

52154036

R170

3

68K

52154016 R170

4

•

6

10K 52154036

RI71 330

52154072 RI72,173

10K

52154036

R174 330 52154072 R175'·2

47K 52154020

R1753-

6

39K

52154022

R176

1M

52154988

Rln'·2

47K

52154020

Rln

3•6

6.8K

52154040

R178

1M

52154988

R179

lOOK

52154012

R180 22K 52154028 RI81'-5

51

52154091

R181

6

(Not Used)

3-46

PCB Audio Assembly (878520) Versions 1

thru

6 Continued

All resistors in ohms, 1/8

watt,

5% unless noted.

Resistors

& Potentiometers Continued

o

Ref

No. Description

Part

No.

R182

1,1/4

watt

52154909

R183

1-5

18K 52154030

R183

6

(Not Used) R184 200 52154077 R185 3.6K 52154047 R186

294, 1

%,

1/4 watt 54042294

R187

1

,2

6.8K 52154040

R187

3-6

(Not Used) R188

6.8K 52154040

R189

68K 52154016

R190 10K

52154036

R191

1

,2

620 52154065

R191

3

-

6

I.3K 52154057

R192, R193

10 52154108

R194

lOOK

52154012

R195

lK

52154060

R196, R197

lOOK

52154012

R198

lK

52154060

R199, R200

lOOK

52154012

R201

lK

52154060

R202, R203

lOOK

52154012

R204

lK

52154060

R205

lOOK

52154012

R206

1•2

470

52154068

R206

3-6

(Not Used) R207

47

52154092

R208

16.2K,I%

54045162

R209

16.9K,

1%

54045169

R210

3.3K

52154048

R211,R212

lOOK

52154012

R213 10K

52154036

R214

470K 52154996

R215

lOOK

52154012

R216, R217 10K

52154036

R218 22K

52154028

R219

1.8K

52154054

R220 5.1K

52154043

R221 10K

52154036

R222

lK

52154060

R223-R236

1

,2

(Not Used) R223

3-6

6.2K

52154041

R224

3

-

6

10K

52154036

R225

3-6

16K

52154031

R226

3-6

33K

52154024

R227

3-6

56K

52154018

R228

3

-

6

47

52154092

R229 R230

3-6

lOOK

52154012

R231

3

-

6

20K

52154020

R232

3

-

6

10K

52154036

R233

3-6

16K

52154031

R234

3-6

lOOK

52154012

R235, R236

3

-

6

1M

52154988

R237-R239

1

(Not Used) R2372-

6

150

52154080

R238

2-6

lK

52154060

R239

2-6

180

52154078

R240

1

-

4

(Not Used) R240

5•6

470

52154068

VRlOl

2.5K,

variable

57148067

VR102

10K, variable

57148069

VR103

lOOK,

speakerpotentiometer

57148013

Ref

No.

Description

Part

No.

Switches

SIOI

Switch, push button

57604001

S102 Switch, 2 position, slide

700127

S103

Switch, push button

57604001

S104

Switch, Dip, 9 position

700128-1

S105-S109 Switch, push button 57604001

SilO

Switch, momentary push button 57604002

S111

Switch, 3 position, slide

700126

S112 Switch, DPDT 700091

Transformers

TIOI Transformer 730094

1,2,3,4,5,6 _ Indicates the Version number

in

which that part is used.

3-47

DISPLAY BOARD

Figure 33

Display

Board

Component Layout (Foil Side)

PCB Display (878519)

Figure 34

Display

Board

ComponentLayout (ComponentView)

0

011

VR604

A

ll

J602

VR603

[[]

([J

[]

ID

[J

~=-_L_ED=60....,7"",,)

{

....

'_ED_6_05_L_E_D6_0_4_L_ED_6_03_L_E_D_60

.....

']

OR602

J601

"

Ref

No.

Description

Part

No.

J601 CableAssembly

640063-3

J602 Cable Assembly

640063-3

Sprocket

450464

VR601 Pilier

Potentiometel~

lOOK

724779

VR602

Piber Potentiometer,

lOOK

724779

VR603

Volumne Potentiometer 723087

VR604 Piber Potentiometer,

lOOK

724779

PCB600

PCB, Display

70716000

LED601

LED,Red

58713000

LED602 LED, Green

58714000

LED603 LED, Green

58714000

LED604

LED, Green 58714000

LED605

LED, Green

58714000

LED606

LED, Yellow

58676000

LED607

LED, Yellow

58676000

LED608 LED, Red

58713000

LED609 LED, Green

58714000

3-48

______

TELEX@

_

PN 802482

24

MAR

1993 Printed

in

U.S.A.

Telex Radiocom BTR-200 Series Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual