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TM 11-5821-28S-12-1
60.  Since a monitor capability is not provided in this
NOTE
hookup, an FM-3 radio should be used for contact and
In
the
one-terminal monitor on operator C-1611/AIC position 3.
secure
e. Radio retransmission is an arrangement of two
voice mode,
radios  connected  together  to  provide  automatic
volume  for
retransmission of signals between two radios that are too
ciphered
far apart to communicate directly with each other.
signals
is
Frequencies selected for the receiver-transmitters at the
controlled
retransmission site must be such that the transmitting
by the VOL
power of one will not interfere with the signals being
control  on
received on the frequency of the other receiver-
the
C-
The frequencies selected should be
1611D/AIC
considered as follows. (1) Fl and F2 must be separated
while  plain
by at least 10 MHz.
signals
(2) Do not use frequencies which are separated
volume  is
by exactly 5.75 or 24.00 MHz,
controlled
(3) Do not use frequencies which are in the order
by both the
of the second harmonic.  For example, the frequency
C-
setting of 30.00, 32.65, and 35.00 will possibly interfere
1611D/AIC
with a radio using 60.00, 65.30 and 70.00 MHz,
and
the
respectively. Changing either the lower frequency or the
HYL-
higher frequency should eliminate the interference that
3/TSEC
may occur.
VOL
controls.
b. Momentarily press the ptt switch on the U-94A/U.
The interrupted tone should no longer be heard in the
earphone and secure voice messages can now be heard
on the monitored channel.
c. To transmit to either station in the secure voice
mode, place the HYL-3/TSEC FUNCTION switch to
XMIT 1 or XMIT 2 as desired; press the ptt switch, wait
for the beep tone and then speak into the microphone.
NOTE
If  at  any
time  it  is
desired  to
operate  in
the
plain
voice mode
with
the
TSEC/KY-
28 installed,
place
the
PLAIN-
CIPHER
switch
on
the
C-
8157/ARC
to  PLAIN.
In the plain
voice mode
the
beep
tone is not
heard in the
earphone
when the ptt
switch
is
pressed.
d. The channel may be operated without an HYL-
3/TSEC installed and retransmit plain voice signals only.
The HYL-3/TSEC cables No.  53 (RT/1) and No.  55
(RT/2) are attached to the two bypass connectors No.


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