TM 55-1510-219-10
Figure 3-6. Voice Security Control Indicator (C-8157/ARC) (KY-28)
3. RE-X/REG switch (Voice security panel)
- As required. (Set RE-X position only if
distant station is using re-transmitting
equipment.)
4. Microphone switch - Press momentarily
(interrupted tone from voice security
unit should no longer be heard).
NOTE
No traffic will be passed if the
interrupted tone is still heard after
pressing
and
releasing
the
microphone switch.
5. Microphone switch- Press (do not talk).
Wait until beep is heard, then speak into
microphone.
(5) Shutdown.
1. Mode selector (VHF/AM/FM panel) -
OFF.
2. POWER ON switch (Voice security
panel) - OFF.
3-13. VOICE SECURITY SYSTEM TSEC/KY-58
(PROVISIONS ONLY).
NOTE
Voice security system TSEC/KY-
58 may be installed in lieu of
voice
security
TSEC/KY-28.
Complete provisions are provided
to install either the KY-28 or the
KY-58 voice security system on
the pedestal extension (fig. 2-10).
The KY-58 voice security system provides secure
(ciphered) two-way voice communications for the pilot
and copilot in conjunction with the VHF/AM/FM
command set, UHF command set and the backup VOW
set. Voice security circuits are protected by the VHF,
VHF/AM/FM, RADIO RELAY, and BU VOW circuit
breakers on the overhead circuit breaker panel fig. 2-
26). For KY-58 operating instructions, refer to TM 11-
5810-262-OP and TM 11-5810-262-20.
3-14. HF COMMAND SET (718 U-5).
a. Description. The HF command set provides
long-range voice communications within the frequency
range of 2.000 to 29.999 MHz and employs
3-13
