PS Engineering PMA450 Pilot’s Guide - Manual (Page 8)

Page 8 202-450-0000 PMA450 Pilot Guide Rev. 3
moved, the green volume bar indicator will show the level of the changing
intercom volume.
Adjust the radios (at the radio itself) and intercom volume for a comfortable
listening level.
Mono headsets in Stereo Installation
Not recommended, because the benefit of IntelliAudio is lost. How-
ever, if desired, the PMA450 can be installed monaurally by using
the LEFT audio connections only (left side contains Fail-Safe audio).
Do NOT short left and right together.
NOTE: Mono headsets that short the tip and ring (i.e. older models)
will introduce some audio distortion when used. Modern, stereo head-
sets are recommended in all positions.
Intercom Modes (8)
The “ICS” pushbutton switch on the panel provides the selection of the
three intercom modes. The description of the intercom
mode function is valid only when the unit is not in the
"Split" mode. In the split mode, the pilot and copilot inter-
com is controlled by the ICS button selecting CRW.
This button cycles through the intercom modes, from left
to right, then right to left as: ISO, ALL, CRW and CRW,
ALL, ISO. A green indicator shows which mode is cur-
rently active.
ISO (Pilot Isolate): The pilot is isolated from the intercom and is connected
only to the aircraft radio system. He will hear the aircraft radio recep-
tion (and sidetone during radio transmissions). Copilot will hear pas-
sengers’ intercom and Music, while passengers will hear copilot inter-
com and Music. Neither will hear aircraft radio receptions or pilot
transmissions. The pilot can hear music if desired.
ALL: All parties will hear the aircraft radio and intercom. Crew and passen-
gers will hear selected Music. During any radio or intercom communi-
cations, the music volume automatically decreases. The music volume
increases gradually back to the original level after communications
have been completed. The music muting can be activated by radio only,
radio and intercom, or nothing, for a Karaoke mode.
CRW (C REW ): Pilot and copilot are connected on one intercom channel
and have exclusive access to the aircraft radios. They may also listen to
Music. Passengers can continue to communicate with themselves with-
out interrupting the crew and may listen to music as configured.