PS Engineering PMA7000CD Installation Manual - Manual (Page 17)

PS Engineering
PMA7000CD- Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-790-0010 Page 2-9 Revision 10, September 2005
2.8 Communications Antenna Installation Notes
For best results while in Split Mode, it is recommended that the one VHF communications antenna is lo-
cated 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’ recommenda-
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 PMA7000CD in Split Mode.
2.8.1 Hook Switches
While the mic selector button acts as the hook switch for the pilot, additional hook switches must be in-
stalled to have full access to the cellphone system. The copilot hook switch is a SPST switch that connects
pin L of J2 on the PMA7000CD to ground to place the copilot mic audio on the Com 3 audio in duplex
mode for cell phone operation.
PMA7000CD J2, pin M is the passenger hook switch. Install a SPST switch in a location adjacent to each
passenger headset where cellphone 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 wireless communication “tel” system utilizes an intercom loop. Therefore, any time the cellphone 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 cell phone, the pilots will have intercom, and continue to hear and transmit
over the avionics normally. However the passengers will not have intercom, because they are on the tele-
phone.
See section 2.5.14 for alternative connection for hook switches.