PS Engineering PAC45A, Инструкция по установке и эксплуатации, Страница: 24 / 50

PS Engineering
PAC45J Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-045-2000 Page 2-15 November 2020
2.7.7 Sidetone (Special Configuration- call factory for details)
2.7.7.1 COM 1 & COM 2 Sidetone or COM 7 & 8 Audio
Transmit sidetone is usually present on the receive audio output. In some cases, a separate sidetone signal is
present (military radios for instance). When Switch 34 is
ON , the PAC45J can accommodate this on J452-
33 (COM 1) and J452-34 (COM 2). These inputs will become active when the respective radio is transmitting.
When Switch 34 is OFF , these inputs become COM 7 and COM 8 audio in.
2.7.7.2 Public Address Sidetone
When Switch 35 is ON , the audio input from J452-37 is active when the PTT is pressed in Public Address
mode as an input from an external PA Amplifier. When Switch 35 is OFF , the PAC45J creates a local side-
tone for public address.
2.7.8 Unswitched Audio
2.7.8.1 Splitting Unswitched 1 and 2 between Pilot and Copilot
Unswitched Input #1 (J452-55) and Unswitched #2 (J452-35) can be split between the pilot and copilot, if
desired. If Switch 36 is “
ON
” the pilot will hear unswitched 1, and never hear unswitched 2, while the copilot
will hear unswitched 2, and never hear unswitched 1.
2.7.8.2 Observer Unswitched Audio
When Switch 37 is ON , the observer positions will receive the unswitched audio. When Switch 37 is OFF,
the observer positions will NOT hear unswitched audio. This mode selection depends upon the role of the
mission observers in the operation of the aircraft.
2.7.9 Headphone Options
2.7.9.1 Stereo or Mono
When Switch 38 is ON , the observer 1 and 2 positions will receive stereo audio (P451-37 left ear, P451-58,
Right ear).
When Switch 38 is OFF , the observer 1 and 2 positions will receive monaural audio (P451-37), which is
useful is only monaural headphones will be used.
When Switch 39 is ON , the Pilot and Copilot positions will receive stereo audio (P451-35 pilot’s left ear,
P451-56, Right ear, P451-35 copilot’s left ear, P451-57, Right ear).
When Switch 38 is OFF , crew positions will receive monaural audio (P451-35 and 36, respectively), which
is useful is only monaural headphones will be used.
NOTE: The MultiTalker® Head Related Transfer Function will not function in a mono headset.
2.7.9.2
Low Impedance (8Ω)
When Switch 40 is ON , the PAC45J audio output is optimized for a low-impedance headphone output of
about 8Ω.
When Switch 40 is OFF , the PAC45J audio output is optimized for a standard civil aviation headphone
impedance headphone output of about 150-300Ω.
2.7.10 Receive Signal Indicator
When Switch 41 is ON , the receive indicator of the selected receiver will blink when an audio signal is on
that input. This is useful for locating the source of a received signal when many are active.
When Switch 41 is OFF , there is no received signal indication.
2.7.11 Music Functions
The PAC45J has several options for music presented to pilot and crew.