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
4. Microphone switch - Press momentarily
(interrupted tone from voice security
unit should no longer be heard).
No traffic will be passed if the
interrupted tone is still heard after
5. Microphone switch- Press (do not talk).
Wait until beep is heard, then speak into
1. Mode selector (VHF/AM/FM panel) -
2. POWER ON switch (Voice security
panel) - OFF.
3-13. VOICE SECURITY SYSTEM TSEC/KY-58
Voice security system TSEC/KY-
58 may be installed in lieu of
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