PS Engineering PAC24 Pilot’s Guide - Manual (Page 5)

Revision 4, April 2009 Page 5 PAC24-Series Pilot Guide
not have transmit access.
The crew has priority on all radios. The observer
can listen to all radios if desired.
Receive Audio Selector (1)
Receiver audio is selected through 9 momentary
push-button, backlit switches.
Because the microphone push-button selector switch controls what
transceiver is being heard, you will always hear the audio from the
transceiver that is selected for transmit.
The users can identify which receivers are selected by noting which of
the green switch LEDs are illuminated. Push buttons for Nav 1, Nav 2,
MKR (Marker), and AUX (auxiliary or ADF in –0500), are momen-
tary type switches. When one of these buttons is pressed, it will place
the audio in the headphone or speaker output, and the
LED will illuminate. Press the switch again and will
remove that receiver from the audio.
If the aircraft is equipped with an ADF or DME, that
audio is available through the AUX button.
NOTE:
On PAC24 –0500 units (Vertical) the AUX is replaced
with ADF
button and DME audio not present.
Speaker Amplifier (4)
The 3-position "SPR" switch controls the distribution of the audio in
the cockpit or external (public address) speakers. In the up “SPR” posi-
tion all selected audio is presented to the cockpit speaker. Unswitched
audio, (autopilot disconnect, altimeter warning, etc.) will come through
the speaker regardless of the speaker button position.
In PA, the primary (pilot) microphone audio is routed to the PA or ex-
ternal speaker (J3 pin B) when the PTT is active. The copilot mic input
can continue to transmit on the selected radio.
Key “Click”
The PAC24 is equipped with a “click” function that provides an aural
feedback to the user in addition to the tactile button push. This sound
can be enabled or disabled by simultaneously holding the COM 1 and
COM 2 buttons in for at least 5 seconds. Any person hearing the radios
will also hear the key click.