PS Engineering PM3000 Installation Manual - Manual (Page 2)

Page 2 200-193-0005 Rev. 8, Nov. 2013
A 2-color LED is green when power is on and changes
to red when a Push to Talk (PTT or microphone key)
is pressed.
Provision for entertainment input allows the pilot, co-
pilot and passengers the option to listen to music dur-
ing flight. During intercom or aircraft radio reception,
this music will automatically mute to allow communi-
cations without distraction. When the activity ceases,
the SoftMute™ circuit gradually returns the music to
the original listening volume. By depressing the
“Mute” control (located on the Squelch knob) once, it
is possible to have the music remain at a constant
level, regardless of any ICS or radio traffic.
During various phases of flight, the degree of impor-
tance of the aircraft radio will vary. Because the "ISO"
mode connects the pilot directly to the aircraft radio,
select the "ISO" mode when the pilot must have top
priority on radio transmissions.
Both pilot and copilot have transmit capabilities over
the radio. The PM3000 only allows the voice of the
person who presses their PTT to be transmitted over
the aircraft radio. If both pilot and copilot press the
PTT at the same time, the copilot will override. When
either pilot or co-pilot presses PTT, all other micro-
phones are disabled. The pilot can regain priority by
switching the unit off.
1.4 Approval Basis
The PM3000, part number 11931A or 11932, is FAA-
approved under TSO-C50c, and RTCA, Inc. DO-214.
Due to the fact that there is no TSO for the recorder
function in the 11933A and 11934, these units are not
TSO-approved. It is the responsibility of the installer
to determine the approval basis for these units.
1.5 Specifications
Input power: 13.8 - 27.5 Volts DC
Current : < 200 mA (Externally fused at 1 Amp)
Headphone Impedance: 150-1000
Ω (typical)
Audio Distortion: <1.2% @ 50mW into 150 Ω load
Aircraft Radio Impedance: 1000 Ω (typical)
Mic Frequency Response:±3 dB, 350 Hz — 6000 Hz
Music Frequency Response: ±3 dB, 200 Hz – 15 kHz
Unit weight:
12 Ounces (0.34 kg)
Dimensions:
1.25" H x 3.00" W x 5.50" D
(3.2 x 7.6 x 14.0 cm)
Environmental and technical qualifications:
RTCA DO-160C/DO-214
Temperature -20º to +55º C
Section I General Information
1.1 Introduction
The PM3000 is an FAA-TSO approved, panel
mounted, 4- to 6-place high-fidelity stereo intercom
system (ICS). Please read this manual completely
before installation to minimize the risk of damage to
the unit and to become familiar with all the features.
1.2 Scope
This manual contains installation and operational in-
structions for the following PS Engineering units:
Model Description Part Number
PM3000 Standard 4-place system 11931A
PM3000 6-place system w/CREW 11932
PM3000 4-place w/recorder 11933A
PM3000 6-place w/CREW & recorder 11934
1.3 Description
The PM3000 is a 4- or 6-place (depending on model),
panel-mounted intercom with multiple volume and
VOX (voice activated squelch) circuits using unified
volume and squelch controls for the pilot, and copilot.
Passengers volume is adjusted at the headset, after
setting a master volume service adjustment on the side
of the unit.
With few controls for the pilot to use, the operation of
the PM3000 is very straightforward. Yet the unit out-
performs its much more complicated competition. Al-
though there is only one volume control knob, when an
adjustment is made to the volume control, the crew
output amplifiers are being changed simultaneously.
Likewise, when the squelch control knob is adjusted,
several VOX circuits are being changed at the same
time. Since the system is designed to use modern ste-
reo headsets, it is not necessary to balance the volume
and squelch controls at the intercom.
A mode switch allows the pilot to select different con-
figurations. The "ALL" mode places all headsets on a
party line. In the "ISO" mode, the pilot is isolated
from all others and is connected to the aircraft radio
allowing un-interrupted radio communications.
The third mode, "CREW," included in part number
11932 (and 11934), allows the pilot and copilot to be
separated from the passengers.
The PM3000 has an automatic fail-safe interconnect to
the aircraft radios. If power is disrupted to the inter-
com for any reason, the pilot's headset is connected
directly to the aircraft radio allowing continued radio
communications in one earcup.