Specifications
PS Engineering
PMA8000B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0100 Page 2-4 Revision 8, May 2008
2.4.5.1 Speaker Load
The PMA8000B contains one speaker amplifier. Some units with internal speaker amplifiers, such as the
King Radio KX170-series, require a resistive load to prevent damage if their speaker amplifier is not used.
Connect the speaker output from the unit to the COM 2 Speaker load input on the PMA8000B (J1 27 WRT
28). The speaker load is 16 Ω, 3W.
2.4.6 TEL (Duplex) Function for Cell Phones
This mode is designed to operate with telecommunications systems, such as the AirCell Guardian 1000.
Audio streams selected by the intercom mode are provided to the Tel output, and audio from Tel is pre-
sented to the headset. This allows a telephone-like audio interface.
The TEL mode in the PMA8000B is also compatible with many cellular telephones with hands-free head-
set interfaces. The front panel 3/32” utility jack can be used as the interface to the Cell Phone, or a 3/32”
jack can be installed somewhere on the aircraft panel. The wired interface jack is connected with the
PMA8000B as shown: A patch cord (3/32” to 3/32”) is available from PS Engineering under P/N 425-006-
7026.
3/32" Cellular Jack
COM 3 Mic Input
Com 3 Audio
Audio Lo
Cellular Plug (typical)
Tip= Microphone out
Ring= Speaker audio
Base=Ground
This is a typical interconnect
PS Engineering does not guarantee
compatability in all cases.
Cellular Phone
Interconnect
Figure 2-1 Cellular telephone interface for rear connector, if an additional jack is desired
2.4.6.1 Cell phone Sidetone
As shipped from PS Engineering, the PMA8000B provides cellular telephone sidetone (the user’s voice fed
back to the headset). Some cell phones provide sidetone, which may result in loud or distorted sidetone. In
this case, an internal modification can be made that will prevent the PMA8000B from providing this side-
tone. Contact PS Engineering for more information.
NOTE
Unauthorized use of unapproved cellular telephone devices in aircraft is subject to FCC enforcement ac-
tion, which may include a $10,000 fine per incident. PS Engineering, Inc. does not endorse using unap-
proved cellular telephone equipment in flight, and takes no responsibility for the user’s action.
PS Engineering does not guarantee compatibility with personal cellular telephones. For a list of phones that
have been tested, visit www.ps-engineering.com.
2.4.7 Transmit Interlock
Some communications transceivers use a transmit-interlock system. To fully utilize the Split Mode feature,
this function must be disabled. Consult that manufacturer's installation manual.
2.4.8 "Swap" Mode
When a momentary, normally open, push-button switch is connected between pin 20 on the J2 connector
and aircraft ground, the user can switch between Com 1 and 2 by depressing this switch without having to
turn the mic selector switch. This yoke-mounted switch eliminates the need to remove your hands from the