PS Engineering PM1000II Operator And Installation Manual - page 5
PM1000II Specialty Intercom Manual
Page 8
January 2002
fic.
ALL (Middle position): All parties will
hear the aircraft radio, intercom, and music.
However, during any ICS or radio communica-
tions, the music volume automatically mutes.
The music volume increases gradually back to
the original level after communications have
been completed.
CREW (Down Position) (ONLY version
with crew, part number 11908 ): Pilot and co-
pilot are connected on one intercom channel
while the passengers are on a separate and inde-
pendent channel. The pilot and copilot are con-
nected to the aircraft radio and may listen to
Music #1. Passengers can continue to communi-
cate with themselves without disturbing the pi-
lot and copilot and may listen to Music #2.
3.4
Internal Recorder (11906, 11908
only)
This records 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 air-
craft radio volume slightly.
3.5
PTT-ICS (11909 only)
The 11909 provides positive control over
the intercom through a separate intercom key
switch that is installed convenient to the pilot or
copilot. When this switch is open, no micro-
phone audio is passed to the intercom. For best
results, turn the intercom squelch fully CCW
and use the PTT-ICS switch to talk on the inter-
com.
In many cases it is possible to revert to
VOX intercom if ambient noise is reduced
(such as during cruise). Place the PTT-ICS
switch in latched position (if equipped).
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 accom-
plished by an FAA- certified avionics shop and
authorized PS Engineering dealer. If the unit is be-
ing installed by a non-certified individual in an ex-
perimental 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. Dur-
ing 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 defec-
tive after consultation with a factory technician. The
customer is responsible for return shipment costs.
This warranty is not transferable. Any implied
warranties expire at the expiration date of this war-
ranty. PS Engineering SHALL NOT BE LIABLE
FOR INCIDENTAL OR CONSEQUENTIAL DAM-
AGES. This warranty does not cover a defect that has
resulted from improper or unreasonable use or main-
tenance as determined by us. This warranty is void if
there is any attempt to dissemble this product with-
out 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 inci-
dental or consequential damages, so the above limi-
tation or exclusions may not apply to you.
January 2002
Page 5
200-124-0100
large amount of attenuation, it does not eliminate
all noise when the amount is excessive. There
must be at least 12 Volts DC present at the
PM1000II for the power supply to work within
its designed regulation. Otherwise, it will not be
able to attenuate noise properly.
Shielding can protect the system from radi-
ated noise (rotating beacon, electric gyros,
switching power supplies, etc.). However, instal-
lation combinations can occur where minor inter-
ference is possible. The PM1000II was designed
in an interference -protected chassis and has in-
ternal 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. Fol-
low the wiring diagram very carefully to help in-
sure a minimum of ground loop potential. Radi-
ated signals can be a factor when low level mic
signals are bundled with current carrying power
wires. Keep these cables separated.
Insulating washers are required on all mic
and headphone jacks to isolate them from aircraft
ground. The use of a conductor instead of a shield
for ground return eliminates these ground loop
paths.
2.2.2
Power Requirements
The PM1000II was designed to work with
either 12/28 volt DC negative ground systems.
The PM1000II must be externally protected with
a one ampere (1A) circuit breaker or fuse.
2.2.3
PTT-ICS (11909 only)
The part number 11909 is designed for noisy
installations, such as open cockpit aircraft. In this
part number unit, no pilot mic audio is passed to
the intercom unless pin 3 or 16, or copilot mic
audio unless pins 2 and 15 are connected to-
gether.
It may be desirable to install a On-off-mom
switch, which will allow the PTT ICS to
“latch” and give VOX operation. In this mode,
the VOX adjustment operates conventionally
2.2.4
IRS Playback
PM1000II part number 11906 and 11908
have an internal recorder that stores incoming
radio messages. A 3.5 mm jack is provided on
the rear of the case. Install a momentary, nor-
mally open switch in a location convenient to
the pilot. Wire to a 3.5 mm mono plug, and
insert into the jack.
2.2.5
Auxiliary Input
Entertainment devices can be connected to
the PM1000II. Install 1/8" jacks convenient the
pilot to connect the entertainment device into
the system. A "Soft Mute" system is installed in
Note: Use the low level (or line) output from any music device
to connect to the PM1000II. Maximum input level is 2 V peak-to-peak.
DO NOT USE SPEAKER OUTPUT.
These levels will cause internal damage.
CopiIot ICS PTT
Copilot ICS PTT
3
16
2
15
Pilot ICS PTT
Pilot ICS PTT
Alternate ICS-PTT using a
momentary-off-latching switch
On
Off
Mom
On
Off
Mom
Alternate ICS-PTT Switching for VOX operation