PS Engineering PM3000 - Manual (Page 4)

Page 4 200-193-0004 Rev. 4, Aug. 2003
2.3 Equipment installation pro-
cedures
Figure 1 Hole Spacing
1. Using the template, drill six holes in the
instrument panel in a location convenient to
the pilot position(s).
2. Insert the PM3000 from behind the instru-
ment panel, aligning the holes for the
knobs, LED, and switch.
3. Place the aluminum plate over the knob
shafts and secure, using the two # 4-40
round head screws provided.
4. Install the knobs over the volume and
squelch control shafts.
5. Complete a wiring harness in accordance
with Appendix D.
2.4 Cable harness wiring
To complete the installation, a wire harness
must be made as shown in Appendix D.
Note:
PS Engineering can make a custom-tailored
wiring harness for the installer. All har-
nesses use Mil-spec quality components
with professional techniques, and are fully
tested before shipment. Contact PS Engi-
neering for more information, www.ps-
engineering.com.
If the aircraft already has pilot headset jacks in-
stalled, you may re-use one mono set for the
AUX (radio ) jacks but they should be moved to
a new location to avoid confusion with the pi-
lot's headphone jacks. In the event the intercom
has to be removed for any reason, these jacks
provide access to the aircraft radio system. Re-
move and discard copilot headset jacks if mono..
To connect intercom into the aircraft audio sys-
tem, parallel the appropriate set of cables from
the intercom to the Auxiliary Aircraft Radio
Headset Jacks. Finally, install new pilot, copilot
and passenger headset jacks into the aircraft and
connect them directly to the appropriate pins of
the PM3000. See the wiring diagram for all de-
tails of the wire harness interconnect.
2.4.1 Electrical Noise Issues
WARNING: You must use individual shielded
cables for the microphone and headphone jacks.
Combining these two wires WILL cause loud
oscillations and degrade the intercom function.
The oscillation is caused by the cross-coupling
between the large headphone signal and the
small microphone signal. The resulting feedback
is a high-pitched squeal that varies with the vol-
ume control.
Due to the variety of the radio equipment found
in today's general aviation aircraft, there is the
potential for both radiated and conducted noise
interference. The PM3000 has a specially de-
signed power supply to reduce conducted elec-
trical noise on the power bus of the aircraft by at
least 50dB. Although this is a very large amount
of attenuation, it does not eliminate all noise
when the amount is excessive. There must be at
least 13.75 Volts DC present at the PM3000 for
the power supply to work within its optimum
regulation. Otherwise, it will not be able to at-
tenuate noise properly.
Shielding can protect the system from radiated
noise (rotating beacon, electric gyros, switching
power supplies, etc.). However, installation
0.250
2 ea. 0.125 0.297
2 ea. 0.314
1.200 1.200
0.838 0.838
0.325
NOT TO SCALE
Page 9 200-193-0004 Rev. 4, Aug. 2003
Normally, any radio traffic or intercom conver-
sation will mute the music heard in ALL mode,
or for the front in CREW. However, when the
crew desires uninterrupted music, the PM3000
can be placed in the Karoake Mode, for singing
along. Press the right knob (squelch) once to
activate Karoake mode, so the music will not be
muted. Press again to restore the SoftMute func-
tion.
Section 4 Warranty and service
4.1 Warranty
In order for the factory warranty to be valid, the
installations in a certified aircraft must be ac-
complished by an FAA-certified avionics shop
and authorized PS Engineering dealer. If the
unit is being installed by a non-certified individ-
ual in an experimental aircraft, a factory-made
harness must be used for the warranty to be
valid.
PS Engineering, Inc. warrants this product to be
free from defect in material and workmanship
for a period of one year from the date of installa-
tion. During this one-year warranty period, PS
Engineering, Inc., at its option, will send a re-
placement unit at our expense if the unit should
be determined to be defective after consultation
with a factory technician.
This warranty is not transferable. Any implied
warranties expire at the expiration date of this
warranty. PS Engineering SHALL NOT BE LI-
ABLE FOR INCIDENTAL OR CONSEQUEN-
TIAL DAMAGES. This warranty does not cover
a defect that has resulted from improper or un-
reasonable use or maintenance as determined by
us. This warranty is void if there is any attempt
to dissemble this product without factory
authorization. This warranty gives you specific
legal rights, and you may also have other rights,
which may vary from state to state. Some states
do not allow the exclusion of limitation of inci-
dental or consequential damages, so the above
limitation or exclusions may not apply to you.
4.2 Factory Service
The PM3000 is covered by a one-year limited
warranty. See warranty information.
Call PS Engineering, Inc. at (865) 988-9800 be-
fore you return the unit. This will allow the serv-
ice technician to provide any other suggestions
for identifying the problem and recommend pos-
sible solutions.
Information is also available by visiting
www.ps-engineering.com/support.shtml
Units that arrive for repair without a method of
payment will be returned via UPS COD.
After discussing the problem with the technician
and you obtain a Return Authorization Number,
ship product to:
NOTE: PS engineering will not be responsible for any
units sent by US Mail.
PS Engineering, Inc.
Service Department
9800 Martel Road
Lenoir City, TN 37772
(865) 988-9800 FAX (865) 988-6619
Appendix A — PTT Modifications
MIC
P-T-T
SWITCH
MIC PLUG
PTT LINE
MIC AUDIO
+
GND
UN-MODIFIED P-T-T
MODIFIED P-T-T
MIC
P-T-T
SWITCH
MIC PLUG
PTT LINE
MIC AUDIO
+
GND
Added By-Pass