PS Engineering PM1000II 11922 - Manual (Page 2)

PM1000II Operation/Installation Manual Page 2 Revision 5, Feb 2012
Section I General Information
1.1 Introduction
The PM1000II, is an FAA-TSO approved, panel
mounted, 4-place 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
PM1000II 4-place intercom system w/Pilot ISO 11922
PM1000II Same as above w/internal crew 11920
1.3 Description
The PM1000II is a 4-place, panel mounted intercom
with individual volume and squelch controls for the
pilot and copilot. The copilot's squelch control adjusts
the trip level of the copilot and passengers.
A front panel mode switch allows the pilot to select
multiple intercom configurations:
"ISO" mode isolates the pilot from the intercom and
connects to the aircraft radio. The passengers can con-
tinue to communicate with each other and listen to
entertainment without distracting the pilot. They do
not hear radio communications.
"ALL" mode places all headsets on a party line. Each
one hears aircraft radio, entertainment and can use the
intercom.
“CREW” (11920 only) allows the pilot and copilot
positions to hear the aircraft radios and use the inter-
com, while the rear passengers can have their own
intercom conversation without disturbing the crew.
This also activates music 2 input.
The PM1000II has an automatic fail-safe interconnect
to the aircraft radio. If power to the intercom is dis-
rupted, an internal relay will connect the pilot's head-
set to the aircraft radio. This allows continuous radio
communications. Note: The copilot will no longer hear
aircraft radio when power is removed.
The 2-color LED shows green when power is on and
red during radio transmissions. This functions as a
stuck mic indicator.
An auxiliary input is provided, allowing the pilot, copi-
lot and passengers the option to listen to music during
flight. During intercom or aircraft radio activity, this
music is automatically muted to allow communications
without distraction. When the activity ceases, the Soft
Mute circuit will gradually return the music to the
original listening volume.
The "ISO" mode provides uninterrupted aircraft radio
communications for the Pilot. Because the pilot's inter-
com volume control does not affect the aircraft radio
volume, it is possible to select various balances of vol-
ume level between the ICS and the aircraft radio while
in the ALL mode. Reducing the intercom volume, the
pilot places the aircraft radio in the foreground while
the ICS is in the background.
Both pilot and copilot have transmit capabilities over
the radio. The PM1000II allows only the person who
presses their PTT to be heard over the aircraft radio. If
both pilot and copilot press the PTT at the same time,
the copilot will override (Ideally suited for training
environments). Pilot regains priority by switching the
unit off.
1.4 Approval Basis
The PM1000II, part numbers 11920 and 11922 are
FAA-approved under TSO-C50c.
1.5 Specifications
Input power: 13.8 - 27.5 Volts DC
Current Drain: < 250 mA (Externally fused at 1 Amp)
Headphone Impedance: 150-1000 ohms typical
Audio Distortion: <10% @ 75 mW into 150
Ω load
Aircraft Radio Impedance: 1000
Ω typical
3 dB Mic Frequency Response: 350 Hz — 6000 Hz
3 dB Music Frequency Response: 200 Hz to 15 kHz
Unit weight: 12 Ounces (0.342 kg)
Dimensions: 1.25" H x 2.60" W x 5.50" D
(3.2 x 6.6 x 14 cm)
Environmental and technical qualifications:
RTCA
DO-160B/DO-170
Temperature -20ºC to +55ºC
Altitude 50,000 ft.
1.6 Equipment required but not sup-
plied
A.Headphones, 150
Ω monaural, up to four as required
B.Microphones, up to four, as required
C.Interconnect wiring
D.Circuit Breaker—1 Amp.
PM1000II, p/n 11920, Front Panel