PS Engineering
PMA7000BT Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-780-0204
Page 2-10
May 2015
2.8
Communications Antenna Installation Notes
For best results while in Split Mode, it is recommended that the one VHF communications antenna is locat-
ed on top of the aircraft while the other communications antenna is installed on the bottom. Any antenna
relocation must be accomplished in accordance with AC 43.13-
2A, aircraft manufacturers’ recommend
a-
tions and FAA-approved technical data.
Warning:
It is probable that radio interference will occur in the split mode when the frequencies of the two air-
craft radios are adjacent, and/or the antennas are physically close together. PS Engineering makes no
expressed or implied warranties regarding the suitability of the PMA7000BT in Split Mode.
2.8.1
Hook Switches (Satellite Telephone Only)
While the Com 3 button acts as the hook switch for the pilot, additional hook switches must be installed to
have full access to the satellite phone systems. The copilot hook switch is a SPST switch that connects pin
L of J2 on the PMA7000BT to ground to place the copilot mic audio on the Com 3 audio in duplex mode
for satellite phone operation.
PMA7000BT J2, pin M is the passenger hook switch. Install a SPST switch in a location adjacent to each
passenger headset where satellite phone use is desired. When pin M is connected to ground through any
switch, the passenger microphones are all on the Com 3/duplex system.
The hook switches are not active or required unless the audio panel is in Com 3 /Duplex mode, with pin J,
J2 grounded.
The Satellite telephone communication system utilizes an intercom loop. Therefore, any time the sat phone
is in use from the pilot or copilot side, pilot and copilot will lose intercom capability. In the ALL mode,
when the passengers’ activate the
sat phone, the pilots will have intercom, and continue to hear and trans-
mit over the avionics normally. However the passengers will not have intercom, because they are on the sat
telephone.
See section 2.4.14 for alternative connection for the hook switches.