Signal Path of Test Set, Radio TS-1967/ARC-54 Connected to Coupler, Antenna CU-942/ARC-54 or CU-943/ARC-54

TM 11-6625-601-34

frequency selector, through contacts 2 and 4 of

the right homer antenna, and the center con-

ductor of the coaxial cable, to plug P2. From

switch S11A (front), contacts 6 and 5 of switch

plug P2, ground is applied to COAX CONT

S10A (front), pin A of jack J10, and pin A of jack

RIGHT lamp DS10, causing the lamp to light.

J101, to the CU-942/ARC-54 or CU-943/ARC-54.

The MHz ambiguity select A control line routes

1-6. Signal Path of Test Set, Radio TS-

f r o m the unit MHz ambiguity frequency

1 9 6 7 / A R C - 5 4 Connected to Coupler,

selector, through contacts 2 and 4 of switch

Antenna CU-942/ARC-54 or CU-943/

S11E (front) contacts 2 and 1 of switch S10B

ARC-54

(front), pin F of jack J10, and pin F of jack J101,

(fig. FO-3)

t o the CU-942/ARC-54 or CU-943/ARC-54.

The test set contains a frequency selection con-

M e g a h e r t z ambiguity select B control line

routes from the unit megahertz ambiguity fre-

trol system, a dummy load, and operating vol-

tage for testing the CU942/ARC-54 or

quency selector, through contacts 8 and 10 of

CU943/ARC-54. The frequency selection con-

switch S11A (front), contacts 2 and 1 of switch

trol system includes two groups of coded control

S10A (front), pin G of jack J10, and pin G of jack

lines. One group contains five control lines,

J101, to the CU942/ARC-54 or CU-943/ARC-54.

b. Operating Voltage and Dummy Load.

labeled MHz select A through E, and the other

group contains two control lines, labeled MHz

Operating voltage of +27.5 volts dc is applied

from the test set, through pin J of ANT

ambiguity select A and B. The RT-348/ARC-54,

normally connected to the CU942/ARC54 or

COUPLER jack J10 and pin J of jack J101, to

CU-943/ARC-54, is simulated by the dummy

the CU-942/ARC-54 or CU943/ARC-54. The

load.

dummy load (antenna coupler load AT2) is con-

n e c t e d f r o m t h e t e s t s e t , t h r o u g h ANT

a. Frequency Selection Control Lines.

Megahertz select control lines A through E and

COUPLER LOAD jack J15 and jack J103, to the

megacycle select ambiguity control lines A and

CU-942/ARC-54 or CU-943/ARC-54.

B, coded for the desired frequency in the unit

1-7. Signal Path of Control, Radio Set

MHz frequency selector, are applied to the tun-

C-3835/ARC-54 Connected to TS-

ing

circuit in

the

CU-942/ARC-54 or

1 9 6 7 / A R C - 5 4 and SM-349/ARC-54

CU943/ARC-54. The tuning circuit operates

(fig. FO-4)

t h e drive motors in the CU942/ARC-54 or

CU-943/ARC-54 until the desired frequency has

The test set, and simulator check the operating

been reached. The MHz select A control line

functions of the C4835/ARC-54. These func-

routes from the unit MHz frequency selector,

tions include frequency selection, squelch con-

through contacts 2 and 4 of TEST FUNCTION

trol, and homing operation. An indicator on the

SELECTOR switch S11A (rear), contacts 11 and

test set provides a visual check of the homing

10 of TEST FUNCTION SELECTOR, switch

circuit. A readout counter in the simulator dis-

the

selection by

the

frequency

plays

S10A (rear), pin E of ANT COUPLER jack J10,

and pin E of jack J101, to the CU942/ARC-54

C-3835/ARC-54. An indicator on the simulator

or CU943/ARC-54. The MHz select B control

checks the operation of the squelch control cir-

line routes from the unit MHz frequency

cuit.

selector, through contacts 8 and 10 of switch

the

a. Frequency

Test.

Selection

S11B (front), contacts 5 and 4 of switch S10B

simulator, t h e F R E Q U E N C Y M C r e a d o u t

(rear), pin D of jack J10, and pin D of jack J101,

counter, ODD MC lamp DS11, EVEN MC lamp

to the CU-942/ARC-54 or CU-943/ARC-54. The

DS12, and HAR FIL lamp DS2 give visual indi-

megahertz select C control line routes from the

cations of the operation of the frequency selec-

unit MHz frequency selector, through contacts

tor circuit in the C-3835/ARC-54. The frequency

11 and 1 of switch S11A (front), contacts 5 and

selected by the C-3835/ARC-54 is indicated on

4 of switch S10A (rear), pin C of jack J10, and

the FREQUENCY MC readout counter. Setting

pin C of jack J101, to the CU-942/ARC-54 or

the frequency selector switches on the

CU-943/ARC-54. The MHz select D control line

C-3835/ARC-54 to a specific frequency codes the

routes from the unit MHz frequency selector,

unit and fractional MHz control wires. This

through contacts 5 and 7 of switch S11B (front),

coded information is applied to motor control

contacts 6 and 5 of switch S10B (front), pin B

unit A2 in the simulator. The motor control unit

of jack J10, and pin B of jack J101, to the

rotates switches S4 and S5 and the counter until

CU942/ARC-54 or CU-943/ARC-54. The MHz

the selected frequency appears in the window

select E control line routes from the unit MHz

of the FREQUENCY MC readout counter. The

1-4