PS Engineering PM1200 Pilot's Manual page 2

INTRODUCTION
The PM1200 is a panel, or blind
mounted, 2-place (expandable with
IntelliPAX) monaural intercom sys-
tem (ICS) designed specifically for
high-noise aircraft. Please read this
manual completely to become famil-
iar with all the features.
Scope
This manual contains operational
instructions for the following PS En-
gineering units:
Part Number
11960
Push to talk intercom for use in noisy cockpits
11961
Same as above but remote (blind) mounting
Description
The PM1200 is a 2-place (unless
expanded), panel-mounted intercom
with PS Engineering's proprietary
IntelliVOX® intercom protocol. The
audio has been further enhanced with
extra audio filtering for the micro-
phones, and added headphone audio
power.
The unit can be used as either
voice-activated, or push to talk inter-
communications, by simply pushing
a front panel switch.
A front panel mode switch al-
lows the pilot to select multiple inter-
com configurations:
The PM1200 has an automatic
fail-safe interconnect to the aircraft
radio. If power to the intercom is
disrupted, an internal relay will con-
nect the pilot's headset to the aircraft
radio. This allows continuous radio
communications. Note: The copilot
will no longer hear aircraft radio
when power is removed.
An entertainment input is pro-
PM1200 Pilots Guide
vided, allowing the users to listen to
music during flight. During intercom
or aircraft radio activity, this music is
automatically muted to allow commu-
nications without distraction. When
the activity ceases, the Soft Mute cir-
cuit gradually returns the music to the
original volume.
Both pilot and copilot have trans-
mit capabilities over the radio. The
PM1200 allows only the person who
presses their radio PTT to be heard
over the aircraft radio. If both pilot
and copilot press the PTT at the same
time, the pilot will override.
Description
Approval Basis *None*
The PM1200, 11960 or 11961,
are NOT FAA Approved. It is the
installer's responsibility to determine
suitability for use.
Specifications
Input power:
Current Drain:
< 250 mA (Externally fused at 1 Amp)
Output 120 mW into 150W @ 27.5 VDC
Headphone Impedance:
Aircraft Radio Impedance:
3 dB Music Frequency Response:200 Hz to
Unit weight:
Dimensions:1.25" H x 3.00" W x 5.80" D
Temperature
Altitude
OPERATION
With the installation complete, turn
the PM1200 on by pressing the pilot's
volume knob. This also engages the auto-
matic fail-safe system. The pilot's volume
control does not control the volume of the
Page 2
13.8 - 27.5 Volts DC
70 mW @ 13.75 VDC
150-1000 ohms
typical
500- 1000 W
typical
15 kHz
12 Ounces (0.342 kg)
(3.2 x 7.6 x 14.7 cm)
-20ºC to +55ºC
50,000 ft.
Revision 2