Mc Frequency Selection Circuit

TM 11-6625-847-45

e.When the SERV SEL switch is set to SSB/NSK or AM,

Frequency

PA CONTROL A1J12

pin 86 of connector J1 is connected through contacts 8

(mc)

and 9 or 8 and 11 of switch A1S1, section C, front, to pin

R

E

S

U

V

79 of connector J1. When the SERV SEL switch is set

20-21

0

1

21-22

1

0

1

to FSK, pin 86 of connector J1 is connected through

22-23

1

0

1

contacts 8 and 10 of switch A1S1, section C, front, to

22-24

1

0

1

pin 76 of connector J1 is connected through contacts 8

4-5

1

0

1

0

and 10 of switch A1S1 section C, front, to pin 76 of

5-6

0

1

0

1

connector J1. When the SERV SEL switch is set to

8-9

1

0

1

0

1

9-10

1

0

1

0

CW, pin 86 of connector J1 is connected through

6-7

1

0

1

contacts 8 and 12 of switch A1S1, section C, front, to

7-8

0

1

0

pin 88 of connector J1.

12-13

0

1

13-14

1

0

1

10-11

0

1

0

1

1-14. Mc Frequency Selection Circuit (fig. 6-3)

11-12

1

0

1

0

Code line

1

2

3

4

5

NOTE

Prefix all reference designators with

1-15. Common Module Tray A1A1

the test set reference designator A2,

(fig. 1-11 and 6-7)

unless otherwise specified.

NOTE

Prefix all reference designators with

a. MC FREQ select switches 10 MC and 1 MC,

common module tray A1A1 reference

A1S9 and A1S11, establish the code for the 28 position

switches on the motor drive assemblies on tray A1A1

designator A1A1, unless otherwise

and tray A1A3, and simultaneously with .1 MC switch

specified.

A1S1, generate the 5-wire code for the AM-3349/GRC-

106 through the RT position of PA/RT switch A1S12 to

a. Figure 1-11 shows the various controls, stimulus

PA CONTROL connector A1J12. The chart in b below

inputs, connectors, resistive loads, and test points

lists the various combinations of grounds and opens on

available on common module tray A1A1 for testing the

the five-wire coding lines for each frequency selected.

noise blanker subassembly, radio frequency (RF)

amplifier module, and dc-to dc converter and regulator

b. Five-Wire Coding Scheme.

module of the RT-662/GRC. The +27-volt dc primary

power input to tray A1A1 from the test set is controlled

NOTE

by POWER switch S1. In the ON position, POWER

1 represents ground;

switch S1 supplies +27-volt dc to DC/DC CONVERTER

0 represents open.

TEST SELECTOR switch, contact terminal 7; to

Frequency

PA CONTROL A1J12

(mc)

POWER indicator DS1; to DC/DC CONVERTER

R

E

S

U

V

CONV/REG TEST switches REG and CONV, contact

2.0-2.5

0

1

0

1

0

terminals 1; and to pin 40 of J1.

3.0-3.5

0

1

0

1

14-15

1

0

1

0

The +27-volt dc at J1, supplied through

1516

1

0

1

POWER switch S3, energizes the converter section of

24-25

0

1

0

the dc-to-dc converter and regulator module A3 on the

25-26

0

1

0

test set. The +20-volt dc input from the test set is

16-17

0

1

connected directly to NOISE BLANKER 20 VDC

17-18

1

0

1

2.5-3.0

0

1

0

connector J2. The + 125-volt dc input from the test set

3.5-4.0

0

1

0

is connected to pin 5 of RF AMPL connector J15. The -

18-19

0

1

0

33-volt dc input from the test set is connected to RF

19-20

0

1

AMPL AGC ADJ control resistor RI. The 6.3-volt ac

26-27

1

0

27-28

1

0

input is connected to pin 1 of RF AMPL connector J15.

28-29

1

0

29-30

1

0

b. When testing the dc-to-dc converter and

regulator module of the RT-662/GRC at J9, the +27-volt

dc input to connector J9 is broken by

Change 2

1-13