Retransmission Procedures

OLD

SQUELCH

3-11.

Retransmission

Preliminary

Starting

for

Procedures

ciphered

a. Tone Squelch Modifications. Radio Set AN/ARC-

communica

131 received from the manufacturer may have the tone

tions

and

squelch disabled. To operate properly as part of the

NEW

AN/ASC-15A(V)(*), the tone squelch must be enabled on

SQUELCH

each installed AN/ARC-131. Return the RT-823/ARC-

ON for plain

131 and control head to general support maintenance to

communica

enable tone squelch, if necessary. The radio can be

tions.

All

tested by communicating with an ANIVRC-12, RT-524,

other

R-442 or RT-246 in the new squelch mode to determine

terminal

if the tone squelch is functional; or communicate with

stations

another ARC-131, or aircraft with a KY-28 and ARC-131,

should use

set the squelch switch to the tone squelch position.

the

tone

Inspect the front panel of the C-7088/ARC-131 (FM

squelch

control head) for a small black card which covers the

modes only

word TONE on the 3rd position of the SQUELCH switch.

(i.e.,

If the word TONE is not covered by a card, proceed to

AN/PRC-

step b.

77:

b. Plain/Secure Radio Retransmission (fig. 3-7, 3-8

FUNCTION

and 1-9). Ensure system connector No. 49 is connected

switch

to receptacle No. 51 of the retrans bracket assembly

SQUELCH,

(fig. 3-8). Also, ensure KY-28 No. 1 (FM-1) connector

AN/VRC-12

35 (P2) is connected to retransmission connector Not 52

series:

(fig. 3-7). Likewise KY-28 No. 2 (FM-2) connector 36

NEW

(P2) is connected to retransmission connector No. 54

SQUELCH

(No. 52 and No. 54 are attached to the new security

ON:

etc.)

bypass adapter box cover plate as shown in fig. 3-7).

for

both

Retransmission monitor KY-28 connector No. 56 and

ciphered

KY-28 No. 1 (FM-1) connector 35 (P1) are to be

and

plain

connected to the

communica

tions.

3-16