PS Engineering PM500EX Installation Manual - Manual (Page 2)

PM500EX Operation/Installation Manual Page 2 April 2011
Introduction
Congratulations on your purchase of a PM500EX
intercom! We at PS Engineering welcome you to our
family.
The PM500EX is a panel mounted, 4-place inter-
com that offers an intelligent low cost alternative for
budget minded pilots who still want quality sound and
performance. This manual provides information on the
installation and operation of the PM500EX. Please
read it completely before installation to reduce the risk
of damage to the unit and maximize your enjoyment of
its use.
Description
The PM500EX is a 4-place, panel-mount intercom
with individual output amplifiers for the pilot, copilot,
and passengers 1 & 2. The VOX (Voice Activated
Squelch) circuit prevents mic audio from getting
through the intercom until someone speaks and auto-
matically opens the circuit. The volume control adjusts
the level for all headsets and functions as a PUSH-ON/
PUSH-OFF power switch.
The PM500EX has an automatic, fail-safe connec-
tion to the aircraft radio. In the event that power to the
intercom is lost, an internal relay will immediately
connect the pilot's headset directly to the aircraft radio.
A provision for an entertainment input allows the
pilot and passengers to listen to music during flight.
During intercom activity, this music automatically
mutes to allow communications without distraction.
Note: the music is NOT muted during radio reception.
The 2-position switch acts as a mode selector. In
the down position, the intercom is in the ALL mode.
Each position will hear the aircraft radio, music, and
each other. In the up position, (ISO mode) only the
pilot is connected to the aircraft radio for undisturbed
radio communications. In ISO, the pilot is no longer
on the intercom. All others will continue to communi-
cate with each other and listen to music if desired.
With the PM500EX, both the pilot and copilot
have radio transmit capabilities. Only the person who
presses their Push To Talk (PTT) will be heard over
the aircraft radio. If both pilot and copilot press the
PTT, the copilot will override. The pilot regains prior-
ity by switching the unit off.
Specifications
Input power: 12-28 Volts DC
Current Drain: < 70 mA Externally fused at 1 Amp
Headphone Impedance: 150-
1000 Ω Typical
Total audio power available: 225 mW
Audio Distortion: <10% @ 75 mW into 150 Ω load
Aircraft Radio Impedance: 1000 Ω Typical
±3 dB Mic Frequency Response: 350 Hz-6000 Hz
±3 dB Music Frequency Response: 200 Hz - 15 kHz
Net weight: 8.5 Ounces (.340 kg)
Dimensions: 0.90" H X 2.60" W X 4.85" D
(2.2 cm x 6.6 cm x 12.3 cm)
FAA Approval – NONE
The PM500EX is not intended for installation
in aircraft with a standard airworthiness cer-
tificated.
Installation
The PM500EX was carefully inspected mechani-
cally and thoroughly tested electrically before ship-
ment. It should be free electrical or cosmetic defects.
Upon receipt, verify that the parts kit contains the fol-
lowing:
• Two # 4-40 Black machine screws
• Two black knobs with white lines
• One 15 pin Sub-D female connector with
hood
• Two connector thumbscrews
• One horizontal face label
• One vertical face label
1. Drill five holes as indicated in a location conven-
ient to the pilot position(s).
2. Once the holes have been drilled, insert the
PM500EX from behind the instrument panel
through the holes for the knobs and switch.
2.620
1.600
0.720
Ш0.500
Ш0.130
Ш0.250
Hole placement diagram (NOT TO SCALE)