PS Engineering PM3000 Installation Manual - Manual (Page 5)

Page 5 200-193-0005 Rev. 8, Nov. 2013
(located on the squelch control) in will inhibit this fea-
ture. Press again to reactivate SoftMute. Music #2
will never be muted during conversation and is heard
only by the passengers while the intercom is in the
Crew mode.
2.4.6 Passenger Volume Adjustment
The 6-place PM3000 (11932, 11934) has adjustments
for passenger volume control. These are accessed
through the left side of the unit (viewed from the
front). There is a separate volume control for the left
and right channels. The left adjustment is toward the
front, and clockwise adjustment reduces passenger
volume.
2.4.7 Internal Recorder (11933A, 11934 only)
PM3000 part number 11933A and 11934 have an in-
ternal recorder that stores recent incoming radio mes-
sages. A 3.5 mm jack is provided on the rear of the
intercom unit to interface this function. Install a mo-
mentary, normally open (NO), switch in a location
convenient to the pilot, and wire to the 3.5 mm plug
(included) across the tip and sleeve contacts. Closing
this switch will activate the playback. A low-current
rated switch is recommended.
2.4.8 Monaural installations
The PM3000 can be installed as a monaural intercom.
Connect the RIGHT channel to the headsets (this con-
tains failsafe audio). Do NOT combine left and right
headphone outputs.
2.4.9 External PTT hook-up
Part of the installation includes the installation of PTT
(Push-to-Talk) switches that allow radio transmissions
from pilot and copilot positions.
There are three configurations that can be used. You
must select the case that best fits your installation.
NOTE: Only the person who presses their PTT switch
will be heard over the radio.
CASE I-The PTT is built into the pilot and copilot
yokes
Simply install the plugs from the headset into the air-
craft headphone jacks. Then use the yoke mounted
PTT to transmit. No other action is required.
CASE –II Built in PTT only on the pilot side
This configuration requires a modified external PTT
switch plugged into the copilot's mic jack. (See Ap-
pendix A) When the copilot's PTT is depressed, this
activates an internal relay that switches the mic audio
to the aircraft radio from the pilot to the copilot.
Case III -No built in PTT switch at all.
Two built-in PTT must be installed or two external,
modified PTT switches will be required for both the
pilot and copilot. Modifications to the PTT may be
required. (See Appendix A)
2.5 Post installation checkout
After wiring is complete, verify aircraft power is
ONLY on pin 13 of the connector, and airframe
ground on pin 1. Other voltages may be present on the
incoming mic lines. Wiring errors can cause serious
internal damage and void PS Engineering's warranty.
1. Apply power to the aircraft and avionics.
2. Plug headsets into the pilot, copilot and passenger
positions.
3. Verify that the pilot position can transmit and re-
ceive with the PM3000 in the OFF position (left
hand knob controls on/off by push on-push off).
4. Push the volume knob to switch the PM3000 on.
Rotate the volume clockwise, about half way. Ver-
ify that the Pwr/Xmt light comes on green. If the
LED is red, immediately switch off the avionics,
and troubleshoot the PTT installation.
5. Verify that the pilot can transmit and receive on the
communications transceivers.
6. Verify proper intercom operation for pilot, copilot
and passengers. For more information, consult Sec-
tion 3.
7. Verify proper transmit and receive operation on the
copilot position, noting that the copilot PTT switch
allows proper transmission.
8. Verify proper Intercom system operation in the
ALL, ISO (and CREW in part number 11932,
11934) modes.
9. Verify that the intercom system does not adversely
affect any other aircraft system by systematically
switching the unit on and off, while monitoring the
other avionics and electrical equipment on the air-
craft.
10. Recorder Check Out (11932A, 11934 only) Tune
a communications radio to an active 2-way chan-
nel, (not AWOS or ATIS). Listen for a radio trans-
mission. When it is concluded, press the
“Playback” button and verify that the last message
plays in the pilot headset.