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The PM 1000 II has these controls:
) A Pilot's ON/OFF/VOLUME/SQUELCH switch. Turn the inner knob clockwise to switch the intercom ON. Turn the knob to control the volume in the pilots headset. The outer (squelch) knob adjusts the level at which the mic operates the intercom. When the knob is set fully counter-clockwise the ambient noise will operate the intercom. This gives a “Hot mic” effect. Set the squelch to operate at a level that is correct for you. The VOX system has a one second delay, this prevents “choppy” speech.
) A Co-Pilot's VOLUME/SQUELCH switch. Turn the inner knob to adjust the volume in the co-pilots headset. The outer (squelch) knob adjusts the level at which the co-pilots and passenger mics operate the intercom. When the knob is set fully counter-clockwise the ambient noise will operate the intercom. This gives a “Hot mic” effect. Set the squelch to operate at a level that is correct for you. The VOX system has a one second delay, this prevents “choppy” speech.
) An ISO/ALL/CREW switch. The PM 1000 II has three modes of operation:
) ALL. The pilot, co-pilot and passengers can all hear the radio. Both the pilots and the passengers can communicate on the intercom.
) ISO. The pilot is connected only to the airplane radio. He is isolated from the intercom. The co-pilot can communicate with the passengers but the co-pilot can not make or hear transmissions on the airplane radio.
) CREW. The pilot and co-pilot are connected on one intercom channel while the passengers are on a separate and independent channel. The pilot and co-pilot are connected to the airplane radio. Passengers can continue to communicate with themselves without disturbing the pilot and co-pilot.
Doc # 6.02.01 Page 3
Rev. 4 09 Jan 2003

23-50-00
AMM

Marker BeaconSensitivity & Test/Mute Select
Marker Beacon

Receive Audio Mic Selector
Indicator Lamps
Selectors

Intercom Mode Crew ICS/Music
Select 1 Mute

Figure 2: Bendix/King KMA 28 Audio Amplifier/Intercom/Marker Beacon Receiver
23-50-00
Communications
AMM

B. Bendix/King KMA 28 Audio Amplifier/Intercom/Marker Beacon Receiver
% (1) KMA 28, General
Figure 2 shows the Bendix/King KMA 28 Audio Amplifier/Intercom/Marker Beacon Receiver. It is mounted above the NAV/COM 1 set in the avionics rack in the instrument panel, see
% Chapter 31.
The KMA 28 is a solid state audio isolation amplifier and audio selector with an automatic voice activated (VOX) intercom system. It can switch up to 3 transceivers (COM 1, COM 2, COM 3) and 6 receivers (NAV 1, NAV 2, ADF, DME, MKR and AUX). COM 3 and AUX are not used in this installation.
A rotary switch selects one of the communication transceivers for the pilot and co-pilot. Either the pilot or co-pilot can transmit on the selected transceiver. In 'Split' mode, the pilot can operate one transceiver while the co-pilot operates the other.
If the power to the system fails, (or if the selector panel is turned off), an Emergency Mode connects the pilot's headset to COM 1.
The audio selector panel has a voice-activated (VOX) intercom system. The system has automatic adjustment. The system has a separate amplifier for each microphone. Only the microphone in use is selected. A VOL control knob sets the volume for both pilots. Intercom squelch is automatic.
The audio selector panel has a three-light marker beacon receiver. It gives the marker beacon lights and audio signals necessary for an ILS approach.
% (2) KMA 28 Audio Selector Functions
The audio selector panel has these controls:
) Audio Selector Buttons. You can select the audio to be heard in the headsets by 2 momentary and 6 latched push-button switches (buttons).
.
COM 1 and COM 2 are the momentary switches. The rotary microphone switch controls which transceiver is heard. You will always hear the audio from the transceiver selected for transmit by the rotary microphone switch.
　
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