PS Engineering PM1200 Pilot's Manual page 3

aircraft radio, allowing an additional
degree of aircraft radio listening flexi-
bility.
NOTE: Blind mounted units will
have same functions, but the controls
will be located on the panel. Consult
your installer for details.
On/Off and Volume
Press the left hand knob to turn the
unit on and off.. This is also the fail-
safe position. Whenever the unit is off,
or power removed, the pilot's headset is
connected directly to the aircraft audio
system.
The pilot volume control knob
adjusts the loudness of the intercom and
music for the pilot's headset only. It has
no effect on aircraft radio volume level.
The co-pilot volume control adjusts the
intercom and music volume for the
copilot.
The green LED will illuminate
when power is on, and turn red in trans-
mit.
Squelch
The PM1200 incorporates both a
Push-to-talk intercom, and PS Engi-
neering's revolutionary IntelliVox
No adjustment of the squelch control is
required. Through individual signal
processors, the ambient noise appearing
in both microphones is constantly be-
ing sampled. Non-voice signals are
blocked. When someone speaks, only
their microphone circuit opens, placing
their voice on the intercom.
The system is designed to block
continuous tones, therefore people
humming or whistling in monotone
may be blocked after a few moments.
November 2024
For best performance, the headset
microphone must be placed within ¼
inch of your lips, preferably against
them. It is also a good idea to keep the
microphone out of a direct wind path.
Moving your head through a vent air
stream may cause the IntelliVox
open momentarily. This is normal.
For optimum microphone
mance, PS Engineering, Inc. recom-
mends installation of a Microphone
Muff Kit from Oregon Aero (1-800-
888-6910). This will not only optimize
VOX performance, but will improve
the overall clarity of all your com-
munications
Push-to-Talk Intercom
In some extremely high noise envi-
ronments, it may be desirable to have a
push to talk (PTT) intercom, instead of
relying on voice-activation (VOX). In
the PM1200 audio panel the PTT in-
tercom capability is added. To operate
the PTT, push the PTT-ICS override
switch on the copilot volume control.
Using an external ICS PTT switch for
pilot and copilot will allow voice on the
intercom.
Intercom Mode Select
The center switch is a mode control
that allows the pilot to tailor the intercom
function to suit flight conditions. Re-
gardless of configuration, the pilot will
always hear the aircraft radio. NOTE: If
there is a power failure to the PM1200,
or if the power switch is turned off, the
copilot will not hear the aircraft
Only the pilot is connected directly to the
aircraft radio.
ISO (Up Position): The pilot is
isolated from the intercom and is con-
nected only to the aircraft radios. He will
hear the aircraft radio reception (and
sidetone during radio transmissions).
Copilot and passengers will hear them-
selves and music but not the aircraft ra-
dio traffic.
ALL (Middle position): All parties
Page 3
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