PS Engineering PM1000II 11922 User Manual

Page 5

Advertising
background image

Revision 5, Feb. 2012

Page 5

200-123-0003

2.Plug headsets into the pilot, copilot and passen-

ger positions.

3.Verify that the pilot position can transmit and

receive with the PM1000II in the OFF posi-
tion (left hand volume knob fully counter-
clockwise).

4.Rotate the pilot volume clockwise, about half

way. Verify that the Pwr/Xmt light comes on,
and shows green. If the LED is red, stop test-
ing and trouble-shoot the microphone PTT
installation.

5.Verify that the pilot can transmit and receive on

the com transceivers.

6.Verify that the LED in the intercom changes

from green to red when a microphone is
keyed.

7.Verify proper intercom operation for pilot, copi-

lot and passengers. For more information,
consult Section III.

8.Verify proper transmit and receive operation on

the copilot position, noting that the copilot
PTT switch allows proper transmission on the
selected transceiver.

9.Verify proper Intercom system operation in the

ALL, ISO And CREW (if equipped) modes.

10.Verify that the intercom system does not ad-

versely affect any other aircraft system by
systematically switching the unit on and off,
while monitoring the other avionics and elec-
trical equipment on the aircraft.

Section III OPERATION

With the installation complete, turn the PM1000II on
by rotating pilot's volume control. This also engages
the automatic fail-safe system. The pilot's volume con-
trol does not control the volume of the aircraft radio,
allowing an additional degree of aircraft radio listening
flexibility.

3.1

Adjusting The Volume (1)

The pilot's volume control knob adjusts the loudness
of the intercom and music for the pilot's headset only.
It has no effect on aircraft radio volume level. The

copilot's volume control adjusts the volume for the
copilot.
In the 11920 units, the volume level for both passen-
gers can be adjusted by a screwdriver adjusted potenti-
ometer located on the left hand side of the intercom as
viewed from the front. It is possible to adjust the over-
all output power to the passenger headsets by changing
this potentiometer. Rotating the potentiometer counter-
clockwise increases the passenger volume.

3.2

Squelch Control (2)

The PM1000II provides individual VOX circuits for
the pilot and copilot. The ability to adjust the trip level
of these VOX circuits (squelch control) allows the use
of dissimilar headsets without the frustration of clip-
ping the first syllables. The PM1000II has three
squelch circuits, one for the pilot, copilot, and one for
the passengers. With individual VOX circuits, back-
ground noise is dramatically reduced.
With the engine running, set the squelch control knob
by slowly rotating the squelch control knob clockwise
until you no longer hear the background noise in the
earphones. When the microphone is positioned prop-
erly near the lips, normal speech levels should open
the channel. When you have stopped talking, there is a
delay of about one second before the channel closes.
This prevents squelch closure between words, and
helps eliminates choppy intercom conversations.

3.3

Mode Select (3)

The center switch is a three position mode control that
allows the pilot to tailor the intercom function to suit
flight conditions. Regardless of configuration, the
pilot will always hear the aircraft radio. NOTE: If
there is a power failure to the PM1000II, or if the
power switch is turned off, the copilot will not hear the
aircraft radio. Only the pilot is connected directly to
the aircraft radio.
ISO (Up Position): The pilot is isolated from the inter-
com and is connected only to the aircraft radios. He
will hear the aircraft radio reception (and sidetone dur-
ing radio transmissions). The pilot will not hear any-
thing when he speaks into the mic on intercom. Copi-

PM1000II w/out crew, p/n 11922

PM1000II w/crew, p/n 11920

Advertising
This manual is related to the following products: