PS Engineering PM501 - Manual (Page 2)

PM501 Operation/Installation Manual Page 2 Revision 7, Feb 2008
Introduction
Congratulations on your purchase of a PM501
intercom! We at PS Engineering welcome you to our
family.
The PM501 is a panel mounted, 4-place intercom
that offers an intelligent low cost alternative for budget
minded pilots who still want quality sound and per-
formance. This manual provides information on the
installation and operation of the PM501. Please read it
completely before installation to reduce the risk of
damage to the unit and maximize your enjoyment of
its use.
Description
The PM501 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 PM501 has an automatic, fail-safe connection
to the aircraft radio. In the event that power to the in-
tercom is lost, an internal relay will immediately con-
nect 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 PM501, 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
It is the installer’s responsibility to determine
the necessary approvals required.
Installation
The PM501 was carefully inspected mechanically
and thoroughly tested electrically before shipment. It
should be free electrical or cosmetic defects. Upon
receipt, verify that the parts kit contains the following:
• 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
Note: Installation of the PM501, using supplied hardware and
available wiring does not require special tools or knowledge other
than described in Advisory Circular 43.13-2. However, it is the in-
staller's responsibility to determine the approval basis for this instal-
lation. PS Engineering makes no assertions that this unit is FAA-
approved for all certified aircraft. An FAA Form 337 or other ap-
proval may be required.
2.620
1.600
0.720
Ш0.500
Ш0.130
Ш0.250
Hole placement diagram (NOT TO SCALE)