PS Engineering PM3000 User Manual

PM3000 (11931) 4-Place Standard Intercom (Without Crew) Wiring Diagram

PM3000 Unit: DB-25 Male

Power In
Ground

A/C Radio Phone Audio Hi
A/C Radio Phone Audio Lo

A/C PTT
A/C Mic Audio Hi
A/C Mic Audio Lo

Pilot Phones (L)
Pilot Phones (R)
Pilot Phones Lo

Copilot Phone Audio (L)
Copilot Phone Audio (R)
Copilot Phone Audio Lo

Pass 1 Phone Audio (L)
Pass 1 Phone Audio (R)
Pass 1 Phone Audio Lo

Pass 2 Phones Audio (L)
Pass 2 Phones Audio (R)
Pass Phones Audio Lo

13
1

14

12
25

22
9

21
8

20
7

19
6

To Aircraft Radio

Phones Audio Hi
AUX Headphone
Jack

To Aircraft Radio Phones Low

Pilot Headphone Jack

Copilot Headphone Jack

Passenger 1
Headphone

Passenger 2
Headphone

12 or 28 VDC

1A

Aircraft Radio PTT

Aux Mic Jack

To Aircraft Radio Mic Audio Lo

To A/C Radio Mic Audio Hi

2-conductor w/shield

3-conductor w/shield

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Lenoir City, TN 37772

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PM3000

Pass 1 Mic Audio Hi
Pass 1 Mic Audio Lo

Pass 2 Mic Audio Hi
Pass 2 Mic Audio Lo

Copilot Mic PTT
Copilot Mic Audio Hi
Mic Audio Lo

Pilot Mic PTT
Pilot Mic Audio Hi
Pilot Mic Audio Lo

Music (L)
Music (R)

Rev. 4, Aug. 2003

15

16
3

10
23

2

24
11

Pass 1 Mic

Pass 2 Mic

Copilot Mic Jack

Copilot PTT

Pilot Mic Jack

9800 MARTEL ROAD, LENOIR CITY TN 377722

TITLE:

Pilot PTT

Entertainment Input

DOCUMENT NUMBER:

SIZE

DATE:

9/27/99

ECO

C/U for Publ.

PM3000 (11931, 11933)
WIRING DIAGRAM

120-133-0002

Recorder Playback Connection (11933, 19934)

Page 12

200-193-0004

REV

SHEET OF

1

3.5 mm plug

Part Number 11931: 4-Place

Standard

Standard

and

Part Number 11932: 6-Place with CC

REW Function

REW

High-fidelity Stereo Intercom System

Operation and Installation Manual

FAA-TSO

2

1

Also includes 11933, 11934, non-FAA TSO units

Document P/N 200-193-0004
Revision 4, Aug. 2003

PS Engineering, Inc. 2003 ©

Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of
PS Engineering, Inc. is strictly prohibited. For further information contact the Publications Manager at PS Engineering,
Inc., 9800 Martel Road, Lenoir City, TN 37772. Phone [phone]

200-193-0004 Rev. 4, Aug. 2003

C50c

Page 1

Section I General Information

1.1 Introduction

The PM3000 is an FAA-TSO approved, panel
mounted, 4- to 6-place high-fidelity stereo 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 instructions for the following PS Engi­neering unit:

Model Description Part Number

PM3000 Standard 4-place system 11931

PM3000 Crew Mode, 6-place system 11932

PM3000 4-place w/digital recorder (non-TSO) 11933

PM3000 6-place w/digital recorder (non-TSO) 11934

1.3 Description

The PM3000 is a 4- or 6-place (depending on
model), panel-mounted intercom with multiple
volume and VOX (voice activated squelch) cir­cuits using unified volume and squelch controls
for the pilot, copilot and passengers.

With few controls for the pilot to use, the opera­tion of the PM3000 is very straightforward. Yet
the unit outperforms its much more complicated
competition. Although there is only one volume
control knob, when an adjustment is made to the
volume control, all output amplifiers are being
changed simultaneously. Likewise, when the
squelch control knob is adjusted, several VOX
circuits are being changed at the same time.
Since the system is designed to use modern ste­reo headsets, it is not necessary to balance the
volume and squelch controls at the intercom.

A mode switch allows the pilot to select differ­ent configurations. The "ALL" mode places all
headsets on a party line. In the "ISO" mode, the

pilot is isolated from all others and is connected
to the aircraft radio allowing un-interrupted ra­dio communications.

The third mode, "CREW," included in part
number 11932 (and 11934), allows the pilot and
copilot to be separated from the passengers.

The PM3000 has an automatic fail-safe intercon­nect to the aircraft radios. If power is disrupted
to the intercom for any reason, the pilot's head­set is connected directly to the aircraft radio al­lowing continued radio communications.

A 2-color LED is green when power is on and
changes to red when a Push to Talk (PTT or mi­crophone key) is pressed.

Provision for entertainment input allows the pi­lot, copilot and passengers the option to listen to
music during flight. During intercom or aircraft
radio reception, this music will automatically
mute to allow communications without distrac­tion. When the activity ceases, the SoftMute™
circuit gradually returns the music to the original
listening volume. By depressing the “Mute” con­trol (located on the Squelch knob) once, it is
possible to have the music remain at a constant
level, regardless of any ICS or radio traffic.

During various phases of flight, the degree of
importance of the aircraft radio will vary. Be­cause the "ISO" mode connects the pilot directly
to the aircraft radio, select the "ISO" mode when
the pilot must have top priority on radio trans­missions.

Both pilot and copilot have transmit capabilities
over the radio. The PM3000 only allows the
voice of the person who presses their PTT to be
transmitted over the aircraft radio. If both pilot
and copilot press the PTT at the same time, the
copilot will override. When either pilot or co­pilot presses PTT, all other microphones are dis­abled. The pilot can regain priority by switching
the unit off.

PM3000 (11932, 11934) w/Crew, 6-place wiring diagram

To A/C Radio Mic Audio Hi

To Aircraft Radio Mic Audio Lo

12 or 28 VDC

1A

To Aircraft Radio

Phones Audio Hi

13114

Power In

Ground

PM3000 Sub-D DB-25 Male on unit

Aircraft Radio PTT

Aux Mic Jack

To Aircraft Radio Phones Low

AUX Headphone

Jack

12

25

22

A/C PTT

A/C Radio Phone Audio Hi

A/C Radio Phone Audio Lo

Pilot Phones (L)

A/C Mic Audio Hi

A/C Mic Audio Lo

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Pilot Headphone Jack

Copilot Headphone Jack

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Pilot Phones Lo

Copilot Phone Audio (L)

Copilot Phone Audio (R)

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Headphone

SEE NOTE 6

Passenger 1

Headphone

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Copilot Phone Audio Lo

Pass 1 & 3 Phone Audio (L)

Pass 1 & 3 Phone Audio (R)

Pass 1 Phone Audio Lo

Pass 2 & 4 Phones Audio (L)

Pass 2 & 4 Phones Audio (R)

Passenger 4

Headphone

Pass 2 Mic

Pass 1 Mic

Passenger 2

Headphone

2

15

6

Pass 2 Mic Audio Hi

Pass 1 Mic Audio Hi

Pass 1 Mic Audio Lo

Pass Phones Audio Lo

3-conductor w/shield

2-conductor w/shield

Copilot PTT

Copilot Mic Jack

Pass 3 Mic

16

3

5

Copilot Mic PTT

Copilot Mic Audio Hi

Mic Audio Lo

Pass 2 Mic Audio Lo

Pass 3 Mic Audio Hi

SEE NOTE 6

Pass 4 Mic

Pilot Mic Jack

18

10

23

Pilot Mic PTT

Pilot Mic Audio Hi

Pass 3 Mic Audio Lo

Pass 4 Mic Audio Hi

Pilot Mic Audio Lo

Pass 4 Mic Audio Lo

2

REV

120-131-0001

PM3000 WIRING DIAGRAM

DOCUMENT NUMBER:

9800 MARTEL ROAD, LENOIR CITY TN 37922

TITLE:

SIZE

Pilot PTT

Entertainment #1 Input

Entertainment #2 Input

24

11

17

Music #2 (L)

Music #1 (L)

Music #2 (R)

Music #1 (R)

1

1

SHEET OF

C/U for Publ.

9/27/99

DATE:

ECO

SEE NOTE 6

4

Rev. 4, Aug. 2003

Page 2

200-193-0004

200-193-0004 Rev. 4, Aug. 2003

Page 11

Appendix B- Instructions for FAA
Form 337

One method of airworthiness approval is
through an FAA Form 337, Major Repair and

Alteration (Airframe, Powerplant, Propeller, or
Appliance) In the case of the PM3000, you may

use the following text as a guide.

Installed x-place intercom, PS Engineer­ing PM3000, part number 1193(_) in
( location )

at station . Installed per
AC43.13-2, Chapter 2, paragraph 23
(Instrument Panel Mounting). Installed
per PS Engineering Installation Opera-
tors Manual p/n 200-193-xxxx, revision
x, dated ( ).

This unit is FAA-Approved under TSO
C50c for audio amplifiers, and meets
environmental tests outlined in RTCA
DO-160C as appropriate or this aircraft.

Interface to existing aircraft radios in ac­cordance with manufacturer’s installa­tion manual and in compliance with
practices listed in AC43.13-2, Chapter 2.
All wires are Mil-Spec 22759 or 27500.
No connection to the aircraft dimmer
bus is required. Power is supplied to the
unit through a 1A circuit breaker (type
and part number), and total electrical
load does not exceed

% of the
electrical system capacity with the
PM3000 added.

Aircraft equipment list, weight and bal­ance amended. Compass compensation
checked. A copy of the operation in­structions, contained in PS Engineering
document 200-193-xxxx, revision (x),
(date) , is placed in the aircraft records.
All work accomplished listed on Work
Order .

Appendix C, Instructions for con-

tinuing airworthiness

The PM3000 is considered an “on-condition”
maintenance item. It is checked prior to each
flight during normal operation. There are no ad­ditional considerations for continuing airworthi­ness other than the practices detailed in AC

43.13-1A, Chapter 15, Paragraph 750. This in­cludes inspecting the unit to be sure it is se­curely fastened in its location, and that the wir­ing harness is not chafed or pinched, and re­mains secure. All panel jacks should be checked
at each periodic inspection to ensure that they
are tight and not in contact with other items be­hind the instrument panel.

Appendix D Wiring Information

12345

14 15 16 17 18

d
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u
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r
G

Pass 2 Mic Hi

Copilot Mic Hi

Pass 1 Mic Hi

A/C Radio Input

6789

19 20 21 221023 24

Copilot PTT

Music Input 2 (R)

Music Input 2 (L)

Pass 3 Mic Hi

Pass 4 Mic Hi

Pass 2 & 4 Phones (R)

Pass 2 & 4 Phones (L)

Pilot Phones (R)

Copilot Phones (R)

Pass 1 & 3 Audio (R)

Pilot Phones (L)

Copilot Phones (L)

Pass 1 & 3 Audio (L)

DB 25 Unit Connector

11 122513

Pilot PTT

Music Input 1 (R)

Music Input #1 (L)

Pilot Mic Audio Hi

)
C
D
V
3

3

­1
1

(
r
e

A/C Radio PTT

w
o
P

A/C Mic Audio Hi

1.4 Approval Basis

The PM3000, part number 11931 or 11932, is
FAA-approved under TSO-C50c, and RTCA,
Inc. DO-214. Due to the fact that there is no
TSO for the recorder function in the 11933 and
11934, these units are not fully TSO-approved.
It is the responsibility of the installer to deter­mine the approval basis for these units.

1.5 Specifications

Input power: 13.8 - 27.5 Volts DC
Current Drain:
< 200 mA (Externally fused at 1 Amp)
Headphone Impedance: 150-1000 Ω(typical)
Audio Distortion:
<1.2% @ 50mW into 150 Ω load
Aircraft Radio Impedance: 1000 Ω (typical)
Mic Frequency Response:
±3 dB, 350 Hz — 6000 Hz
Music Frequency Response:
±3 dB, 200 Hz – 15 kHz
Unit weight: 12 Ounces (0.34 kg)
Dimensions:

1.25" H x 3.00" W x 5.50" D
(3.2 x 7.6 x 14.0 cm)
Environmental and technical qualifications:
RTCA DO-160C/DO-214
A1D1/CA(MN)XXXXXZBBBBTBKXX
Temperature -20º to +55º C

1.6 Equipment required but not
supplied

A. Interconnecting cables as required (may be

ordered from PS Engineering)

B. Headphones, 150 Ω stereo, as required

C. Microphones, general aviation, as required

D. Interconnect wiring

E. Crimping Tool, AMP (661966-1 or equiv.)

and Positionerg 601966-5

F. Circuit Breaker 1 Amp.

Section II Installation

2.1 General Information

The PM3000 comes with all mounting hardware
and jacks for installation. Installation of the
PM3000, using the hardware supplied and avail­able wiring does not require special tools or
knowledge other than those used in the industry,
and described in FAA Advisory Circular 43.13-

2. It is the installer's responsibility to determine
the approval basis for this installation. An FAA
Form 337, or other approval may be required.
See Appendix B for example of FAA Form 337.

2.2 Unpacking and preliminary
inspection

The PM3000 was carefully inspected mechani­cally and thoroughly tested electronically before
shipment. It should be free of electrical or cos­metic defect.

Upon receipt, verify that the parts kit includes
the following:

PM3000 Installation Kits:

Part Number Description 11931 11932 11933 11934

475-442-0002 #4-40 Machine screws, black 2 2 2 2
625-003-0001 Knobs (Soft Touch) 2 2 2 2
575-030-0001 PM3000 Faceplate (w/crew) 1 1
575-030-0003 PM3000 Faceplate (no crew) 1 1
425-025-0010 25 pin Sub-D connector shell 1 1 1 1
425-020-5090 Crimp Sockets 25 25 25 25
625-025-0001 Connector hood 1 1 1 1
475-002-0002 Connector Thumbscrews 1 2 1 2
200-193-0003 Operator's and Installation Manual 1 1 1 1
122-001-0000 Drill Template 1 1 1 1
475-003-0002 Insulated Shoulder Washers 9 13 9 13
475-003-0001 Insulated Flat Washers 9 13 9 13
550-001-0002 Stereo Headphone Jack 4 6 4 6
550-001-0003 Microphone Jack 4 6 4 6
550-008-0001 Music Input Jack ⅛” 1 2 1 2
550-005-0001 IRS Plug (3.5 MM mono) 1 1

Rev. 4, Aug. 2003

Page 10

200-193-0004

200-193-0004 Rev. 4, Aug. 2003

Page 3

2.3 Equipment installation pro­cedures

1.200

0.838 0.838

0.250

2 ea. 0.125

NOT TO SCALE

Figure 1 Hole Spacing

1. Using the template, drill six holes in the
instrument panel in a location convenient to
the pilot position(s).

2. Insert the PM3000 from behind the instru­ment panel, aligning the holes for the
knobs, LED, and switch.

3. Place the aluminum plate over the knob
shafts and secure, using the two # 4-40
round head screws provided.

4. Install the knobs over the volume and
squelch control shafts.

5. Complete a wiring harness in accordance
with Appendix D.

1.200

0.297

0.325

2 ea. 0.314

2.4 Cable harness wiring

To complete the installation, a wire harness
must be made as shown in Appendix D.

Note:

PS Engineering can make a custom-tailored

wiring harness for the installer. All har-

nesses use Mil-spec quality components
with professional techniques, and are fully
tested before shipment. Contact PS Engi-

neering for more information, www.ps-

engineering.com.

If the aircraft already has pilot headset jacks in-

stalled, you may re-use one mono set for the
AUX (radio ) jacks but they should be moved to
a new location to avoid confusion with the pi­lot's headphone jacks. In the event the intercom
has to be removed for any reason, these jacks
provide access to the aircraft radio system. Re­move and discard copilot headset jacks if mono..

To connect intercom into the aircraft audio sys­tem, parallel the appropriate set of cables from
the intercom to the Auxiliary Aircraft Radio
Headset Jacks. Finally, install new pilot, copilot
and passenger headset jacks into the aircraft and
connect them directly to the appropriate pins of
the PM3000. See the wiring diagram for all de­tails of the wire harness interconnect.

2.4.1 Electrical Noise Issues

WARNING: You must use individual shielded
cables for the microphone and headphone jacks.
Combining these two wires WILL cause loud
oscillations and degrade the intercom function.
The oscillation is caused by the cross-coupling
between the large headphone signal and the
small microphone signal. The resulting feedback
is a high-pitched squeal that varies with the vol­ume control.

Due to the variety of the radio equipment found
in today's general aviation aircraft, there is the
potential for both radiated and conducted noise
interference. The PM3000 has a specially de­signed power supply to reduce conducted elec­trical noise on the power bus of the aircraft by at
least 50dB. Although this is a very large amount
of attenuation, it does not eliminate all noise
when the amount is excessive. There must be at
least 13.75 Volts DC present at the PM3000 for
the power supply to work within its optimum
regulation. Otherwise, it will not be able to at­tenuate noise properly.

Shielding can protect the system from radiated
noise (rotating beacon, electric gyros, switching
power supplies, etc.). However, installation

Normally, any radio traffic or intercom conver­sation will mute the music heard in ALL mode,
or for the front in CREW. However, when the
crew desires uninterrupted music, the PM3000
can be placed in the Karoake Mode, for singing
along. Press the right knob (squelch) once to
activate Karoake mode, so the music will not be
muted. Press again to restore the SoftMute func­tion.

Section 4 Warranty and service

4.1 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 at our expense if the unit should
be determined to be defective after consultation
with a factory technician.

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.

4.2 Factory Service

The PM3000 is covered by a one-year limited
warranty. See warranty information.

Call PS Engineering, Inc. at [phone] be­fore you return the unit. This will allow the serv­ice technician to provide any other suggestions
for identifying the problem and recommend pos­sible solutions.

Information is also available by visiting
www.ps-engineering.com/support.shtml

Units that arrive for repair without a method of
payment will be returned via UPS COD.

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

NOTE: PS engineering will not be responsible for any
units sent by US Mail.

PS Engineering, Inc.
Service Department
9800 Martel Road
Lenoir City, TN 37772
[phone] FAX [phone]

Appendix A — PTT Modifications

UN-MODIFIED P-T-T

GND

GND

+

MIC

+

MIC

P-T-T
SWITCH

MODIFIED P-T-T

P-T-T
SWITCH

MIC AUDIO

Added By-Pass

MIC AUDIO

MIC PLUG

PTT LINE

MIC PLUG

PTT LINE

Rev. 4, Aug. 2003

Page 4

200-193-0004

200-193-0004 Rev. 4, Aug. 2003

Page 9

phone channels off (silent) while the pilot, copi­lot or passengers are not speaking. This reduces
background noise from the aircraft. Only when
someone speaks will their microphone turn on,
allowing the audio to pass through the system.
Although there is just one squelch control, there
are actually three separate squelch threshold cir­cuits. One circuit each for the pilot, copilot, and
passengers. Only the microphone actually in use
is open, reducing noise in the system.

With the engine running, set the squelch control
knob by slowly rotating the squelch control knob
clockwise until you no longer hear the back­ground noise in the earphones. When the micro­phone is positioned properly near the lips, nor­mal speech levels should open the channel.
When you have stopped talking, there is a delay
of about one half second before the channel
closes. This prevents squelch closure between
words, and helps eliminate choppy intercom
conversations.

3.3 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,

Mode Pilot Hears Copilot Hears Passenger Hears Comments

Isolate

All

Crew
(11932 11934 only)

A/C Radio,

Pilot Sidetone

(during radio transmis­sion)

Pilot,

Copilot,

A/C Radio,

Passengers,

Music #1

Pilot,

Copilot,

A/C Radio

Entertainment #1

Copilot and passenger
intercom,

Music #1

Copilot,

Pilot,

A/C Radio,

Passengers,

Music #1

Copilot,

Pilot,

A/C Radio

Entertainment #1

Rev. 4, Aug. 2003

the pilot will always hear the aircraft radio.
NOTE: If there is a power failure to the
PM3000, 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 reception
(and sidetone during radio transmissions). 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 conversation, the music volume
automatically mutes. The music volume in­creases gradually back to the original level after
communications have been completed.

CREW (11932, 11934 only) (down position):
Pilot and copilot positions will hear aircraft ra­dio and music number one. Passengers will only
hear other passenger’s intercom, and music
number 2. Music number two will not mute dur­ing intercom conversation.

3.4 Music Mute Control

Passenger and Copilot
intercom,

Music #1

Passengers,

Pilot,

Copilot,

A/C Radio,

Music #1

Passengers,

Entertainment #2

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This mode allows the
pilot to communicate with
the ground without the
copilot or passengers
bothered by the conver­sations. Copilot and
passengers continue to
communicate and listen

This mode allows all on
board to hear radios as
well as communicate on
the intercom. Music and
intercom is muted during
intercom and radio com­munications

A second music source
is automatically enabled
for the passengers. Rear
music not muted.

200-193-0004

combinations can occur where minor interfer­ence is possible. The PM3000 was designed in
an interference -protected chassis and has inter­nal filter capacitors on all input lines.

Ground loop noise occurs when there are two
different return paths for the same signal, such
as airframe and ground return wire. Large cyclic
loads such as strobes, inverters, etc., can inject
audible signals onto the airframe return path.
Follow the wiring diagram very carefully

to help
insure a minimum of ground loop potential. Ra­diated signals can be a factor when low level
microphone signals are bundled with current
carrying power wires. Keep these cables sepa­rated.

Insulating washers are required

on all micro­phone and headphone jacks to isolate them from
aircraft ground. The use of a conductor instead
of a shield for ground return eliminates these

CREW mode.

It is possible to use only one entertainment de­vice to provide music for both inputs in the
11932 system by connecting the output of the
entertainment device in parallel to both the Mu­sic #1 and Music #2 inputs. We highly recom­mend, however, that you install a switch be­tween the entertainment device and Music #1.
This will give the pilot and copilot the ability to
switch off music while in the CREW mode.

The music device will automatically mute when
the ICS or aircraft radio becomes active. The
Soft Mute™ feature slowly returns the music to
full volume when the activity ceases. Pressing
the Mute disable switch (located on the squelch
control) in will inhibit this feature. Press again
to reactivate SoftMute. Music #2 will never be
muted during conversation and is heard only by
the passengers while the intercom is in the Crew

ground loop paths.

2.4.2 Power Requirements

The PM3000 was designed to work with 12.8 to

27.5 volt DC negative ground systems. The
PM3000 must be externally protected with a one
ampere (1A) circuit breaker or fuse.

Use only low level output of the entertainment

devices to connect to the PM3000. Maximum

signal level on the input is 3-volts peak-to-peak.

DO NOT USE

SPEAKER

OUTPUT LEVELS.

This will cause internal damage.

2.4.3 Sidetone

The PM3000 can be modified to produce side­tone (hearing your voice during transmit), if the
aircraft radios do not produce it. Contact the PS
Engineering factory for details.

2.4.4 Entertainment Input

Stereo entertainment devices can be connected
to the PM3000. Install ⅛" stereo jacks conven­ient the pilot and passengers to connect the en­tertainment devices into the system. PM3000,
part number 11931 has a single entertainment
input. The part number 11932 will accommo­date two inputs, one for the crew, and another
separate input that feeds the 4 passengers in

200-193-0004 Rev. 4, Aug. 2003

Page 5

If speaker levels are to be used, install an

Audio Link, p/n 101PL2,

available from Crutchfield (1-800-955-3000).

Local oscillators and other internal signals

from CD or radio equipment can cause unde-

sired interference with VHF navigation and

communication equipment.

Before takeoff, operate the entertainment

device to determine if there is any adverse
effect on aircraft systems. If any unusual op­eration is noted in flight, immediately switch

the entertainment device off

mode.

2.4.5 Passenger Volume Adjustment

The 6-place PM3000 (11932, 11934) has adjust­ments for passenger volume control. These are
accessed through the left side of the unit (viewed
from the front). There is a separate volume con­trol for the left and right channels. The left ad­justment is toward the front, and clockwise ad­justment reduces passenger volume.

2.4.6 Internal Recorder (11933, 11934
only)

If the PM3000 unit is a part number 11933 or
11934 there is an internal recorder built into the
unit. This stores the last 60 seconds of radio traf­fic. Only the pilot’s position will hear the play­back.

To use this function, a normally open (NO) mo­mentary switch is connected to the 3.5 mm
mono jack on the side of the unit. A low-current
switch is recommended.

A radio signal of more than 1 VRMS is needed
to trigger the IRS. Therefore, if the IRS does not
seem to be recording, increase the aircraft radio
volume slightly.

2.4.7 Monaural installations

The PM3000 can be installed as a monaural in­tercom. Connect the RIGHT channel to the
headsets (this contains failsafe audio). Do NOT
combine left and right headphone outputs.

2.4.8 External PTT hook-up

Part of the installation includes the installation
of PTT (Push-to-Talk) switches that allow radio
transmissions from pilot and copilot positions.

There are three configurations that can be used.
You must select the case that best fits your in­stallation. NOTE
their PTT switch will be heard over the radio.

: Only the person who presses

CASE I-The PTT is built into the pilot and copi-

lot yokes

Simply install the plugs from the headset into the
aircraft headphone jacks. Then use the yoke
mounted PTT to transmit. No other action is re­quired.

CASE –II Built in PTT only on the pilot side

This configuration requires a modified external
PTT switch plugged into the copilot's mic jack.
(See Appendix A) When the copilot's PTT is de­pressed, this activates an internal relay that
switches the mic audio to the aircraft radio from
the pilot to the copilot.

Case III -No built in PTT switch at all.

Two built-in PTT must be installed or two exter­nal, modified PTT switches will be required for
both the pilot and copilot. Modifications to the
PTT may be required. (See Appendix A)

2.5 Post installation checkout

After wiring is complete, verify aircraft power is
ONLY on pin 13 of the connector, and airframe
ground on pin 1. Other voltages may be present
on the incoming mic lines. Wiring errors can
cause serious internal damage
neering's warranty.

1. Apply power to the aircraft and avionics.

2. Plug headsets into the pilot, copilot and
passenger positions.

3. Verify that the pilot position can transmit
and receive with the PM3000 in the OFF
position (left hand knob controls on/off
by push on-push off).

4. Push the volume knob to switch the
PM3000 on. Rotate the volume clock­wise, about half way. Verify that the
Pwr/Xmt light comes on green. If the
LED is red, immediately switch off the

and void PS Engi-

avionics, and troubleshoot the PTT in­stallation.

5. Verify that the pilot can transmit and
receive on the communications trans­ceivers.

6. Verify proper intercom operation for
pilot, copilot and passengers. For more
information, consult Section 3.

7. Verify proper transmit and receive op­eration on the copilot position, noting
that the copilot PTT switch allows
proper transmission.

8. Verify proper Intercom system opera­tion in the ALL, ISO (and CREW in
part number 11932, 11934) modes.

9. Verify that the intercom system does
not adversely affect any other aircraft
system by systematically switching the
unit on and off, while monitoring the
other avionics and electrical equipment
on the aircraft.

Recorder Option:

Verify that the incoming radio signals are stored
and played back using the external switch in­stalled

3. Section III OPERATION

With the installation is complete, turn the
PM3000 on by pushing the volume control. This
also engages the automatic fail-safe system. The

intercom volume control does not control the
volume of the aircraft radio, allowing an addi­tional degree of aircraft radio listening flexibil-

ity.

Figure 2 PM3000 (11931, 11933) front panel

controls

Figure 3 PM3000 (11932, 11934) front panel

controls

3.1 Adjusting the Volume

The PM3000 volume control knob adjusts the
loudness of the intercom and music only. The
volume control on the PM3000 does not
the volume level of the aircraft radio. This al­lows the aircraft radio and intercom volume to
be balanced independently. The volume control
affects the music level for the pilot and copilot
positions.

By turning the control clockwise, the audio level
will increase. The PM3000 has individual out­put amplifiers for each headset in the system and
provides plenty of audio output power. NOTE:
Volume level will not change with the number
of headset installed.

Music # 2 passenger volume in CREW mode
(11932 and 11934) version is a fixed level, and
controlled locally by the headphone volume con­trol or music device.

affect

3.2 Adjusting the Squelch Con­trol

This VOX operated intercom keeps all micro-

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200-193-0004

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