PS Engineering PM3000 Installation Manual - Manual (Page 6)

Page 6 200-193-0005 Rev. 8, Nov. 2013
Section III OPERATION
With the installation is complete, turn the PM3000 on
by pushing the volume control. This also engages the
automatic fail-safe system. The intercom volume con-
trol does not control the volume of the aircraft radio,
allowing an additional degree of aircraft radio listening
flexibility.
Figure 2 PM3000 (11931A, 11933A) front panel
controls
Figure 3 PM3000 (11932, 11934) front panel con-
trols
3 .1 Adjusting the Volume
The PM3000 volume control knob adjusts the loud-
ness of the intercom and music only. The volume con-
trol on the PM3000 does not affect the volume level of
the aircraft radio. This allows the aircraft radio and
intercom volume to be balanced independently. The
volume control affects the music level for the pilot and
copilot positions.
By turning the control clockwise, the audio level will
increase. The PM3000 has individual output amplifi-
ers for each headset in the system and provides plenty
of audio output power. NOTE: Volume level will not
change with the number of headset installed.
Music # 2 passenger volume in CREW mode (11932
and 11934) version is a fixed level, and controlled
locally by the headphone volume control or music
device.
3.2 Adjusting the Squelch Control
This VOX operated intercom keeps all microphone
channels off (silent) while the pilot, copilot or passen-
gers are not speaking. This reduces background noise
from the aircraft. Only when someone speaks will their
microphone turn on, allowing the audio to pass
through the system. Although there is just one squelch
control, there are actually three separate squelch
threshold circuits. One circuit each for the pilot, copi-
lot, and passengers. Only the microphone actually in
use is open, reducing noise in the system.
With the engine running, set the squelch control knob
by slowly rotating the squelch control knob clockwise
until you no longer hear the background noise in the
earphones. When the microphone is positioned prop-
erly near the lips, normal speech levels should open
the channel. When you have stopped talking, there is a
delay of about one half second before the channel
closes. This prevents squelch closure between words,
and helps eliminate choppy intercom conversations.
Mode Pilot Hears Copilot Hears Passenger Hears Comments
Isolate A/C Radio,
Pilot Sidetone
(during radio trans-
mission)
Copilot and passenger
intercom,
Music #1
Passenger and Copilot
intercom,
Music #1
This mode allows the pilot to commu-
nicate with the ground without the
copilot or passengers bothered by the
conversations. Copilot and passengers
continue to communicate and listen to
music #1
All Pilot,
Copilot,
A/C Radio,
Passengers,
Music #1
Copilot,
Pilot,
A/C Radio,
Passengers,
Music #1
Passengers,
Pilot,
Copilot,
A/C Radio,
Music #1
This mode allows all on board to hear
radios as well as communicate on the
intercom. Music and intercom is muted
during intercom and radio communica-
tions
Crew
(11932 11934 only) Pilot,
Copilot,
A/C Radio
Entertainment #1
Copilot,
Pilot,
A/C Radio
Entertainment #1
Passengers,
Entertainment #2
A second music source is automati-
cally enabled for the passengers. Rear
music not muted.