Retransmit and Receive Audio Signal Test.

TM 11-6625-601-34

j a c k J101 to the C-3835/ARC-54. From the

ID-48/ARN. Ground for the simulated over tar-

C - 3 8 3 5 / A R C - 5 4 , the push-to-talk ground is

get homing signal is applied, through contacts

applied through pin v of jack J101 to pins 41 and

5 and 8 of switch S3A (front), pin 21 of plug P4,

42 of plug P4 on the simulator. The push-to-talk

and pin D of jack J2, to the horizontal needle

ground applied to pins 41 and 42 of plug P4 is

circuit in the ID-48/ARN. Operating voltage for

routed to contact 1 of FUNCTION SELECTOR

t h e ID-48/ARN flags is obtained from the

switch S3B (rear) and contact 5 of switch S3A

C-3835/ARC-54. The voltage is applied through

(rear), respectively. Setting switch S3 to OFF

pin GG of jack J101 and pin E of jack J2 to the

applies the push-to-talk ground through con-

flag circuit in the ID-48/ARN. The ID-48/ARN

tacts 1 and 10 of switch S3B (rear) to PTT SEC

flag control ground is obtained from retransmit

lamp DS6 and, through contacts 5 and 4 of

ground s w i t c h S 1 . S e t t i n g s w i t c h S 1 t o

switch S3A (rear), to PTT INT SEC TONE lamp

R E T R A N S TONE or RETRANS CARRIER

DS7 causing lamps DS6 and DS7 to light. Sett-

applies the control ground through pin 11 or 10

ing switch S3 to SEC applies the push-to-talk

of plug P4, respectively, and pin Z or y of jack

ground through contacts 5 and 8 of switch S3A

J101, respectively, to the C-3835/ARC-54. From

(rear), pin 44 of plug P4, and pin K of jack J1,

t h e C-3835/ARC-54, the control ground is

to the security device; this activates the secur-

applied through pin FF of jack J101 and pin F

ity tone control and security operate circuits.

of jack J2 to the flag circuit in the ID-48/ARN.

Ground from the security tone control circuit is

e. Retransmit and Receive Audio Signal Test.

A n a u d i o signal applied t o a h e a d s e t -

applied through pin P of jack J1 and pin 39 of

plug P4 to contact 3 of switch S3A (rear). Setting

microphone connected to HEADSET jack J7 is

switch S3 to SEC applies ground through con-

amplified in the simulator and applied to the

tacts 3 and 4 of switch S3A (rear) to PTT INT

C-3835/ARC-54 as a simulated RT-348/ARC-54

SEC TONE lamp DS7, causing lamp DS7 to

receive audio signal. An audio signal from Con-

light. Ground from the security sidetone control

trol, Intercommunication Set C-1611D/AIC is

circuit is applied through pin A of jack J1 and

a p p l i e d through the C-3835/ARC-54 to the

pin 43 of plug P4 to contact 9 of switch S3B

simulator and the security device as a simulated

(rear). Setting switch S3 to SEC applies ground

R T - 3 4 8 / A R C - 5 4 transmit audio signal. The

through contacts 9 and 10 of switch S3B (rear)

receive a u d i o s i g n a l e n t e r s t h e s i m u l a t o r

to PTT SEC lamp DS6, causing the lamp to light.

through pin 3 of jack J7 and is amplified by

transistors A 1 Q 1 , A 1 Q 2 , a n d A 1 Q 3 . T h e

An additional check of the security device is

obtained by applying an audio signal to SEC

amplified receive audio signal is routed,

AUDIO REC jack J4 and monitoring the resul-

through emitter follower A1Q4, pin 13 of plug

tant coded signal at SEC AUDIO ST jack J5.

P4, and pin JJ of jack J101, to the

The audio signal is routed from SEC AUDIO

C-3835/ARC-54. From the C-3835/ARC-54, the

REC jack J4, through pin 15 of plug P4 and pin

receive audio signal is applied, through pin N

E of jack J1, to the security device. The security

of jack J101 and pin 30 of jack J1, to the

device codes the input audio signal and applies

C-1611D/AIC. The transmit audio signal is

it, through pin V of jack J1 and pin 40 of plug

routed from the C-1611D/AIC through pin 24 of

P4, to SEC AUDIO ST jack J5. Ground for the

J1 and pin y of jack J101, to the C-3835/ARC-54.

security audio signal is applied from the secur-

From the C-3835/ARC-54, the transmit audio

ity device, through pin N of jack J1 and pin 38

signal is applied through pin x of jack J101 to

of plug P4, to SEC AUDIO COM jack J6.

pin 6 of plug P4 (on the simulator) and pin B

of jack J1 (on the security device). From pin 6

g. Homer Antennas Continuing Test. Dc con-

of plug P4, the transmit audio signal is applied,

tinuity of the left and right homer antenna sys-

through VOL control R4, emitter follower A1Q5,

tem is checked by applying ground through each

and pin 2 of jack J7, to the headset-microphone.

antenna system to the associated homer lamp

The transmit audio signal applied to pin B of

in the simulator. The left homer antenna sys-

jack J1 is coded in the security device and

tem is checked by applying ground, through the

routed through pin C of jack J1 and pin 7 of plug

shield of the associated coaxial cable, the left

P4 to SEC AUDIO XMIT jack J3.

homer antenna, and the center conductor of the

f. Security Device Test. The security device

coaxial cable, to plug P1. From plug P1, ground

codes the transmit audio when a push-to-talk

is applied to COAX CONT LEFT lamp DS9,

ground is applied to it from the C-1611D/AIC.

causing lamp DS9 to light. The right homer

Push-to-talk ground from the C-1611D/AIC is

antenna system is checked by applying ground,

applied through pin 33 of jack J1 and pin q of

through the shield of associated coaxial cable,

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