PS Engineering PM500EX Pilot’s Guide

ISO (Up Position): The pilot is isolated from the intercom and is con-

nected to the aircraft radios only. He will hear only the aircraft radio recep­tion and sidetone (only during radio transmissions). Copilot and passengers
will hear the intercom and music but not the aircraft radio receptions or
transmissions.

All (Down position): All parties will hear the aircraft radio reception and
transmissions, intercom, and music. However, during any intercom activity,
the music volume automatically decreases. The music volume increases
gradually back to the original level after communications have been com­pleted. The radio traffic will not mute the music.

NOTE: When either the pilot or copilot PTT is depressed, all microphones
are off except for the transmitting one.

Warranty

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. In certified air­craft, an FAA Form 337 must accompany the warranty card for this warranty to be
in effect. During the warranty period, the unit must be returned to PS Engineering,
Inc. and, at their option, it will send a replacement at no charge. The customer is
responsible for shipping charges returning the unit to PS Engineering.

This warranty is not transferable. Any implied warranties expire at the expiration
date of this warranty. WE 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 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 your state.

Service

9800 Martel Road

Lenoir City, TN 37772

www.ps-engineering.com

PM501

PM501

Low Cost, 4--

Low Cost, 4

Pilot’s Guide

Pilot’s Guide

Place Intercom

Place Intercom

and

and

Contact PS Engineering, Inc. at [phone] or www.ps-engineering.com/

support.html.

tion without the possible need for returning the unit. If the unit does need servic­ing, ship product in UPS approved packaging (not US Mail) to:

PS Engineering, Inc., Attn.: Service Department

9800 Martel Road

Lenoir City, TN 37772

Phone: [phone]

FAX [phone]

All repairs MUST have a contact phone number listed. After the warranty period,
PS Engineering offers a low, flat-fee repair for the life unit.

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A technician may be able to diagnose the problem and offer a solu-

PM501-Pilot Guide

Operation Manual

Operation Manual

Revision 22

Revision

Copyrighted information in this manual is subject to change without notice. PS
Engineering reserves the right to improve or change the products or contents of
this manual, without notification of any person or agency. The contents of this
pilot’s guide may be downloaded, stored and reprinted for personal use provided
that this copyright information is included. Commercial use is strictly prohibited.
For further information contact the Publications Manager at PS Engineering,
Inc., 9800 Martel Road, Lenoir City, TN 37772. Phone [phone]

PM501 Pilot Guide

PS Engineering, Inc. 2003 ©

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August

August

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2003

Introduction

Congratulations on your purchase of a PM501 intercom! We at PS Engi­neering welcome you to our family.

The PM501 is a panel mounted, 4-place intercom that offers a low cost al­ternative for budget minded pilots who still want quality sound and per­formance. This manual provides information on the operation of the
PM501. Please read it completely to maximize your enjoyment of its use.

Description

OPERATING INSTRUCTIONS

Turn the PM501 on pressing the volume control knob (left knob). This also
engages the automatic fail-safe system.

1

The PM501 is a 4-place intercom with individual output amplifiers for the
pilot, copilot, and passengers 1 & 2. The VOX (Voice Activated Squelch)
circuit prevents mic audio from getting through the intercom until someone
speaks. The volume control adjusts the level for all headsets and functions
as a PUSH-ON/PUSH-OFF power switch.

The PM501 has an automatic, fail-safe connection to the aircraft radio. In
the event that power to the intercom is lost, an internal relay will immedi­ately connect the pilot's headset directly to the aircraft radio.

A provision for an entertainment input allows the pilot and passengers to
listen to music during flight. During intercom activity, this music automati­cally mutes to allow communications without distraction. Note: the music is
NOT muted during radio reception.

The 2-position switch in the center is an intercom mode selector.
With the PM501, both the pilot and copilot have radio transmit capabilities.

Only the person who presses their Push To Talk (PTT) will be heard over
the aircraft radio. If both pilot and copilot press the PTT, the copilot will
override. The pilot regains priority by switching the unit off.

Specifications

Input power: 12-28 Volts DC
Current Drain: < 70 mA: Externally fused at 1 Amp

Headphone Impedance: 150-

Total audio power available: 225 mW

Aircraft Radio Impedance: 1000
±3 dB Mic Frequency Response: 350 Hz-6000 Hz
±3 dB Music Frequency Response: 200 Hz - 15 kHz
Net weight: 8.5 Ounces (.340 kg)
Dimensions: 0.90" H X 2.60" W X 4.85" D
(2.2 cm x 6.6 cm x 12.3 cm)

1000 ΩTypical

Ω Typical

3

2

Adjusting The Volume (1)

The volume control knob (1) adjusts the loudness of the intercom and music
for all headsets. Turning the control clockwise increases the audio. Many
headsets have volume controls on them. If it becomes necessary to reduce
the volume for an individual passenger, the three others should be set at
maximum, and the unit volume set for a comfortable level. The individual
can then reduce their volume accordingly.

The volume control on the PM501 does not have any affect the radio vol­ume. This gives added flexibility for communications requirements. Vol­ume control is also not affected by plugging in other headsets.

Adjusting The Squelch Control (2)

This VOX operated intercom keeps all microphone channels off while the
pilot, copilot or passengers are not speaking. This reduces background
noise from the aircraft. Only when someone speaks will their microphones
automatically turn on, passing the audio through the system.

Set the Squelch control knob (2) by slowly rotating the squelch
clockwise until you no longer hear the engine noise in the earphones. When
the microphone is positioned properly near your lips, normal speech levels
should open the channel. When you stop talking, there is a delay of about a
second before the channel closes. This prevents closure between words and
eliminates choppy communications.

knob

Mode Select (3)

The center switch (3) is a 2- position mode switch that allows the pilot to
tailor the intercom function to best meet the pilot's needs. Regardless of
configuration, the pilot will always hear the aircraft radio.

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PM501-Pilot Guide

PM501 Pilot Guide

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