PM1000
II
Operation/Installation Manual
Page 2
Revision 8, April 2020
Section I General Information
1.1
Introduction
The
PM1000
II
, 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
PM1000
II
4-place intercom system w/Pilot ISO
11922
PM1000
II
Same as above w/internal crew
11920
1.3
Description
The
PM1000
II
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
PM1000
II
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
blue during radio transmissions. This functions as a
stuck mic indicator.
A music input allows the pilot, copilot and passengers
the option to listen to music during flight. During inter-
com or radio activity, music is automatically muted.
When the activity ceases, the Soft Mute circuit will
gradually return the music.
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
PM1000
II
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).
1.4
Approval Basis
The
PM1000
II
, 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
load
Aircraft Radio Impedance:
1000
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
monaural, up to four as required
B.Microphones, up to four, as required
C.Interconnect wiring
D.Circuit Breaker—1 Amp.
1.7
Expansion (11616)
When installing the expansion unit, all passenger mic
and h/p jacks must be connected to the 11616
PM1000II, p/n 11920, Front Panel