Installation - PS Engineering PM501 Operator And Installation Manual

Installation

The PM501 was carefully inspected me-
chanically 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: Do not remove the nuts from the vol-
ume and squelch controls.
1. Drill five holes as indicated in a location
convenient to the pilot position(s).
2.620
1.600
Ø0.130
Hole placement diagram (NOT TO SCALE)
2. Once the holes have been drilled, insert
the PM501 from behind the instrument panel
through the holes for the knobs and switch.
3. Depending on the panel thickness (<
Revision 7 Feb. 2008
0.040") you may elect to use a locally fabricated
aluminum faceplate to provide additional sup-
port. Place the aluminum plate over the knob
shafts, and secure with the #4-40 screws pro-
vided.
4. Next install the two knobs by pressing
them on the shafts.
5. Remove the backing from either the verti-
cal or horizontal face label, carefully align over
the knob shafts, and press on firmly.
6. To complete the installation, a wiring
harness must be made and routed as shown at the
back of the manual.
IMPORTANT: You must use separate
shielded cable for the microphone and head-
phone jacks. Combining these two wires WILL
cause loud oscillations and degrade the intercom
functions. The cause of the oscillation is due to
the fact that there is a much larger signal being
carried by the headphone wire than the micro-
phone wire. When these two wires are within the
same shielded cable, cross-coupling allows the
output to get back into the input, causing oscilla-
tions to occur.
If the aircraft already has pilot and copilot
headset jacks installed, you may re-use the hard-
Ø0.250
ware. Remove all wires from the copilot jacks
and discard them. NOTE: You may elect to use
the existing pilot headset jacks as the auxiliary
jacks.
Ø0.500
0.720
NOTE: A custom wire harness can be cus-
tom made to your specifications by the
factory. Call the factory for more details.
hook the intercom into the system, simply paral-
lel a set of mic and headphone wires from this set
of auxiliary jacks directly to appropriate points to
the PM501. Finally, install a new set of pilot
headset jacks and hook directly to the appropri-
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