PS Engineering PM1200 Pilot’s Guide

reception (and sidetone during radio transmis-

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support.shtml

Flying Never Sounded So Good!™

This product is NOT FAA-approved, consult regulatory agency for 

approval basis

sions). Copilot and passengers will hear them­selves and music but not the aircraft radio traffic.

ALL (Middle position): All parties will hear

the aircraft radio, intercom, and music. However,
during any ICS or radio communications, the mu­sic volume automatically mutes. The music vol­ume increases gradually back to the original level
after communications have been completed.

Warranty and Service

Warranty

In order for the factory warranty to be valid,
the installations in a certified aircraft must be ac­complished by an FAA- certified avionics shop
and authorized PS Engineering dealer. If the unit
is being installed by a non-certified individual in
an experimental aircraft, a factory-made harness
must be used for the warranty to be valid.

PS Engineering, Inc. warrants this product to
be free from defect in material and workmanship
for a period of one year from the date of installa­tion. During this one year warranty period, PS
Engineering, Inc., at its option, will send a re­placement unit to the PS Engineering dealer, if
the unit should be determined to be defective after
consultation with a factory technician. PS Engi­neering will not ship to the end user under war­ranty, unless authorized by the dealer.

This warranty is not transferable. Any implied
warranties expire at the expiration date of this
warranty. PS Engineering SHALL NOT BE LI­ABLE FOR INCIDENTAL OR CONSEQUEN­TIAL DAMAGES. This warranty does not cover a
defect that has resulted from improper or unrea­sonable use or maintenance as determined by us.

This warranty is void if there is any attempt to
dissemble this product without factory authori­zation. This warranty gives you specific legal
rights, and you may also have other rights which
may vary from state to state. Some states do not
allow the exclusion of limitation of incidental or
consequential damages, so the above limitation
or exclusions may not apply to you.

Factory Service

The PM1200 is covered by a one-year lim-

ited warranty. See warranty information.

Call PS Engineering, Inc. at (865) 988­9800 before you return the unit. This will allow
the service technician to provide any other sug­gestions for identifying the problem and recom­mend possible solutions.

After discussing the problem with the tech­nician and you obtain a Return Authorization
Number, ship product to:

PS Engineering, Inc.

Attn: Service Department

9800 Martel Road

Lenoir City, TN 37772

[phone] FAX [phone].

Www.ps-engineering.com/support.shtml

NOTE:

PS Engineering is not responsible for units

shipped US Mail.

If no method of payment is provided, the units
will be returned COD. If no RMA or description of
problem is present, the shipment will be refused.

Sound Quality. Sound Engineering.

PM1200

Panel Mounted Intercom withPanel Mounted Intercom with

IntelliVOX®IntelliVOX®

for High Noise Applicationfor High Noise Application

Part No. 11960

Includes 11961

Pilots Guide

PS ENGINEERING, INCORPORATED

9800 Martel Road

Lenoir City, TN 37772

Phone [phone] FAX [phone]

www.ps-engineering.com

PS Engineering, Inc. 2003©

Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of PS Engineering, Inc. is strictly prohibited. For

PM1200 Pilots Guide Page 4 January 2003

further information contact the Publications Manager at PS Engineering, Inc., 9800 Martel Road, Lenoir City, TN 37772. Phone [phone]

Copyright Notice

NOTICE: Warranty is not valid unless this prod-

uct is installed by an Authorized PS Engineering

January 2003 Page 1 202-196-0100

Document Number 202-196-0100

January 2003

General Information

Introduction

The PM1200 is a panel, or blind mounted,

2-place (expandable with IntelliPAX) monaural
intercom system (ICS) designed specifically for
high-noise aircraft.

In addition to IntelliVOX® (PS Engineer­ing’s proprietary intercom squelch protocol), the
PM1200 includes Active Microphone Process­ing (AMP). This signal processing is specifically
designed to improve the intelligibility of human
speech, so don’t expect the PM1200 to sound
like a normal intercom. All of the intercom
audio power of the unit is focused in the voice
range, while the music fidelity remains unaf­fected.

Please read this manual completely to be­come familiar with all the features.

Scope

This manual contains operational instruc­tions for the following PS Engineering units:

Part Number Description

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 microphones, and
added headphone audio power.

The unit can be used as either voice­activated, or push to talk intercommunications,
by simply pushing a front panel switch.

A front panel mode switch allows the pilot

to select multiple intercom configurations:

The PM1200 has an automatic fail-safe inter-

connect to the aircraft radio. If power to the inter­com is disrupted, an internal relay will connect 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 provided, allowing
the users 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 gradually returns the music to
the original volume.

Both pilot and copilot have transmit 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.

Approval Basis *None*

The PM1200, 11960 or 11961, are NOT
FAA Approved. It is the installers responsibility to
determine suitability for use.

Specifications

Input power: 13.8 - 27.5 Volts DC
Current Drain: < 250 mA (Externally fused at 1 Amp)
Output 120 mW into 150Ω @ 27.5 VDC
70 mW @ 13.75 VDC
Headphone Impedance: 150-1000 ohms typical
Aircraft Radio Impedance: 500- 1000 Ω typical
3 dB Music Frequency Response: 200 Hz to 15 kHz
Unit weight: 12 Ounces (0..35 kg)
Dimensions: 1.25" H x 3.00" W x 5.80" D

(3.2 x 7.6 x 14.7 cm)
Temperature -20ºC to +55ºC
Altitude 50,000 ft.

OPERATION

With the installation complete, turn the

PM1200 on by pressing the pilot’s volume knob.
This also engages the automatic fail-safe system.
The pilot's volume control does not control the
volume of the aircraft radio, allowing an addi­tional degree of aircraft radio listening flexibility.

NOTE: Blind mounted units will have same

functions, but the controls will be located on

the panel. Consult your installer for details.

On/Off and Volume

Press the left hand knob to turn the unit on
and off.. This is also the fail-safe position. When­ever the unit is off, or power removed, the pilot’s
headset is connected directly to the aircraft audio
system.

The pilot 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 co-pilot volume control ad­justs the intercom volume for the copilot.

The green LED will illuminate when power
is on, and turn red in transmit.

Squelch

The PM1200 incorporates both a Push-to-talk
intercom, and PS Engineering’s revolutionary Intelli-
Vox™. No adjustment of the squelch control is re­quired. Through individual signal processors, the ambi­ent noise appearing in both microphones is constantly
being sampled. Non-voice signals are blocked. When
someone speaks, only their microphone circuit opens,

placing their voice on the intercom.

NOTE:

The headset microphone must be placed within

¼ inch of your lips, preferably against them. It is also

a good idea to keep the microphone out of a direct

wind path. Moving your head through a vent air stream

may cause the IntelliVox™ to open momentarily. This

is normal.

For optimum microphone performance, PS Engineer­ing, Inc. recommends installation of a Microphone
Muff Kit from Oregon Aero (1-800-888-6910). This will
not only optimize VOX performance, but will improve
the overall clarity of all your communications

Push-to-Talk Intercom

Under extremely high noise conditions, it
may be desirable to have a push to talk (PTT)
intercom mode, instead of relying on voice­activation (VOX). In the PM1200 the PTT inter­com capability is user selectable .

To activate the PTT-ICS Mode, push the
PTT-ICS override switch on the copilot volume
control. Using the separate ICS PTT (not the
radio PTT) button for pilot and one for the copi­lot will allow their voice on the intercom.

Intercom Mode Select

The center switch is a 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
PM1200, 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 intercom and is connected only to the
aircraft radios. He will hear the aircraft radio

PM1200 Pilots Guide Page 2 January 2003

January 2003 Page 3 202-196-0100