TM 55-1510-221-10
Figure 3-6. Voice Security Control Indicator (C-8157/ARC)
c.
VHF/AM/FM Set and Voice Security Oper-
ation.
(1.) Turn-on procedure:
POWER ON
switch (Voice security panel, fig. 3-6) - ON.
NOTE
The POWER ON switch must be in ON
position, regardless of the mode of the
operation, whenever the voice security
(CIPHONY) KY-28 is installed in the air-
craft.
(2.) Receive operating procedure:
1.
SQUELCH
control
(VHF/
AM/FM panel) - As required.
2. Transmitter-interphone
selector
(audio panel, fig. 3-1) -#2 posi-
tion. or Audio monitor control #2
- ON.
3. Mode selector (VHF/AM/FM
panel) - TR.
4. Frequency
selectors
(VHF/
AM/FM panel) - As required.
5. PLAIN/CIPHER switch (voice
security panel) - As required.
(3.) Transmit
operating
procedure
(PLAIN):
1.
Transmit/interphone
selector
(audio panel) - No. 2 position.
2. PLAIN/CIPHER switch (Voice
security panel) - PLAIN.
3. Microphone switch - Press.
(4.) Transmit operating procedure (CI-
PHER):
1.
Transmit/inter-phone
selector
(audio panel) - No. 2 position.
PLAIN/CIPHER switch (Voice
security panel) - CIPHER. Indica-
tor will be on while switch is in
CIPHER position.)
2.
3.
4.
RE-X/REG switch (Voice security
panel) - As required. (Set RE-X
position only if distant station is
using re-transmitting equipment.)
Microphone
switch
-
Press
momentarily (interrupted tone
3-13
