Tel (Duplex) Function For Cell Phones; Public Address Mode - Honeywell Bendix/King KMA 30 Manual

the yoke to change transceivers. The transfer of TX indication from Com 1 to Com 2 shows that the swap
has been initiated; there is no dedicated swap indicator.
2.4.9

TEL (Duplex) Function for Cell Phones

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 KMA 30 is compatible with many cellular telephones with hands-free headset inter-
faces. The front panel 3/32" utility jack can be used as the interface to the Cell Phone, or a jack can be
installed somewhere on the aircraft panel. The wired interface jack is connected with the KMA 30 as
shown: A patch cord (3/32" to 3/32") is available from Bendix/King under P/N 425-006-7026.
KMA 30
J1
This is a typical interconnect
Bendix/King does not guarantee
compatability in all cases.
Figure 2-1 Cellular telephone interface for rear connector, if an additional jack is desired
The KMA 30 is compatible with most Bluetooth® enabled devices for making and receiving telephone
calls through the aircraft audio system.
2.4.9.1 Cell phone Sidetone
As shipped from Bendix/King, the KMA 30 does provide cellular telephone sidetone (the user's voice fed
back to the headset). Some cell phones already provide sidetone. In KMA 30 audio panels, Telephone
sidetone can be disabled if desired by pressing the TEL and ADF buttons for more than one second.
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.
FCC Regulation 47 CFR § 22.925 Prohibition on airborne operation of cellular telephones.
Cellular telephones installed in or carried aboard airplanes, balloons or any other type of aircraft must not
be operated while such aircraft are airborne (not touching the ground). When any aircraft leaves the
ground, all cellular telephones on board that aircraft must be turned off.
Bendix/King, Inc. does not endorse using unapproved cellular telephone equipment in flight, and takes no
responsibility for the user's action.
Bendix/King does not guarantee compatibility with personal cellular telephones.

2.4.10 Public Address Mode

By pressing the Mute and SPR pushbuttons at the same time, the KMA 30 will be placed into public ad-
dress (PA) mode. In this mode, the pilot will be talking over the cockpit speaker when he presses his PTT
switch. Copilot will still continue on the selected COM radio.
When the discrete Output is enabled, J2 Pin 19 will go low when in PA mode, providing a logic level that
can be used to incorporate a speaker-switching scheme. This 50 mA circuit (10Ω Z) can control a switch-
ing means such as a relay that would transfer the speaker output amplifier from the cockpit speaker to
200-890-5464
Bendix/King by Honeywell
KMA 30 Audio Panel and Intercom System
Installation and Operator's Manual
Cellular Plug (typical)
Tip= Microphone out
Ring= Speaker audio
Base=Ground
Com 3 Audio
COM 3 Mic Input
Audio Lo
NOTE
Page 2-5
Cellular Phone
Interconnect
3/32" Cellular Jack
Rev. 1, Aug. 2012