PS Engineering PMA7000H Installation Manual - Manual (Page 25)

PS Engineering
PMA7000H Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-780-0429 Page 3-6 Rev. 4, Dec 2012
3.6.3.3 Soft Mute and Soft Mute inhibit
The Soft Mute feature assures that the aircraft radio transmissions and other audio will not be missed due to
entertainment playing. When there is radio reception or intercom conversation, the music level is dropped to
a low, or background level. When the radio or intercom traffic ceases, the level gradually returns to normal.
The front panel ICS switch controls muting of entertainment source #1 (for pilot and copilot). Pushing this
button places the ICS in Karaoke (or sing along) mode, which inhibits the soft mute feature. This allows the
music to continue uninterrupted by intercom or radio traffic when cockpit workload is appropriate. Pushing
the button again will release the mute inhibit function.
The passenger music, source #2, can be placed in the Karaoke mode if a remote switch is installed in the
aircraft. See wiring information for details.
3.7 Push-to-Talk Intercom Mode
The PMA7000H has a push to talk intercom function available for the crew positions. When the external
PTT ICS enable switch is activated, the pilot and copilot must use the remote ICS PTT switches to talk on
the intercom. Passenger intercom is normal.
3.8 Telephone Mode
The Com 3 mode can serve as a full duplex interface for telephone systems such as AirCell or portable cel-
lular phones with earpiece jacks, if the installation is correctly configured. When interfaced with an ap-
proved airborne telecommunications system, the PMA7000H can serve as a audio control and distribution
center. Each intercom position has a "hook switch." The pilot's hook switch is the "Com 3" button on the
audio panel, the others are discrete switches mounted adjacent to the headset jacks. When Com 3 is active
in the duplex mode, the TX button will blink about twice as fast as the normal transmit rate.
When the intercom is in ALL mode, the pilot can speak on the phone only if the Com 3 is selected for
transmit (Com 3 Xmt button activated). If any passenger places his or her switch into the “off-hook”
position all passengers will also be heard on the phone. All will hear selected audio. Com 1 audio is auto-
matically heard in the headsets. The pilot and copilot will have transmit capability on the other selected
transceiver Com 1 or 2, simply by using their respective PTT switch.
In CREW mode, the pilot and copilot are may use the telephone, with their respective hook switch (the
pilot selects Com 3 on the Xmt selector). Any passenger who places their switch into the off-hook position
will also have access to the phone, and all passengers will hear the conversation.
In ISO intercom mode, when the PMA7000H is in the Com 3 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
or 2, 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.
Note: Because the cellphone uses an intercom circuit, all stations on that circuit will lose
intercom capability when the cellphone is in use.
3.9 Marker Beacon Operation
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.