PS Engineering PMA7000M-S Installation And Operation Manual - page 28
PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-070-0004
Page 3-7
Rev. 4, Oct.200-070-0006
Page 3-7
on the phone. All will hear selected audio. Com 1 audio is automatically heard in the head-
sets. The pilot will have transmit capability on Com 1, simply by using the PTT switch.
In CREW mode, the pilot and copilot are may use the telephone, with their respective
hook switch (the pilot selects TEL on the mic selector). Any passenger who places their
switch into the off-hook position will also have access to the phone, and all four passen-
gers will hear the conversation.
In ISO intercom mode, when the PMA7000M-S is in the TEL mode, the pilot position is
in the "Phone Booth." Only the pilot will hear the telephone, and only he will be heard. He
will also have access to Com 1, and will transmit on that radio using the PTT. All selected
audio is provided. If any other passenger goes “off hook” they will hear the phone.
In all cases, only the pilot (and copilot in ALL or CREW) will hear the cellphone ring. At
that time they can chose to allow a passenger to take the call, or answer the phone.
Note: Because the cellphone uses an intercom circuit, all stations on that cir-
cuit will lose intercom capability when the cellphone is in use.
3.8 Marker Beacon (PMA7000M-S)
The optional Marker Beacon Receiver uses visual and audio indicators to alert you when
the aircraft passes over a 75 MHz transmitter.
The Blue lamp, labeled "O," is the Outer Marker lamp and has an associated 400 Hertz
'dash' tone. The lamp and tone will be keyed at a rate of two tones/flashes per second
when the aircraft is in the range of the Outer Marker Beacon.
The Amber lamp, labeled "M," is the Middle Marker lamp and is coupled with a 1300
Hertz tone. It is keyed alternately with short 'dot' and long 'dash' bursts at 95 combinations
per minute.
The White lamp, labeled "I," is the Inner marker and has a 3000 Hertz 'dot' tone. The lamp
and tone will be keyed at a rate of six times per second.
The audio from the Marker Beacon Receiver can be heard by selecting the "MKR" push-
button switch. To adjust the volume level, there is a service adjustment located on the top
of the unit. See Section 2.5
A three position switch is used to set the receiver sensitivity and to test the indicator
lamps. Use "H
IGH
" sensitivity initially. This allows you to hear the outer marker beacon
about a mile out. Then select the “L
OW
” sensitivity to give you a more accurate location
of the Outer Marker. The momentary down switch position is labeled "T
EST
" and illumi-
nates all three lamps simultaneously to assure the lamps(internal and external) are in
working order. TST does not activate MM sense ouput.
3.9 Internal Recorder System (Option 1 and 2 only)
The Intercom Recording System (referred to here as the IRS) is a digital recording system
allowing automatic storage and immediate playback of all incoming aircraft radio recep-
tions.