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− PM 501 Voice activated intercom.
Communications
DA20-C1 AMM
Page 2
30 Apr 2009 23-00-00 Doc # DA201-C1
Rev. 15
− Press-to-transmit buttons on each control stick.
− Mic and phone jack-sockets for each pilot.
− A cabin speaker (optional).
C. Static Discharging
The composite structure of the DA20-C1 makes a special bonding system necessary. Copper
foil tape with conductive adhesive and bonding wire connect metal components. They also
connect the ground planes for antennas.
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 15 23-10-00 Page 1
30 Apr 2009
CHAPTER 23-10
SPEECH COMMUNICATION
1. General
The DA20-C1 has single or dual VHF communications only. The basic single system has a
Bendix\King KX 125 NAV COMM. The basic dual system also has a Bendix\King KLX 135\135A
GPS COMM and GNS430W/GNS530W GPS COMM as the COMM 2 installation. A Bendix\King
KX 155 can replace the KX 125 as a customer option.
In single installations the integral speaker amplifier operates the optional cabin speaker. In dual
installations, an audio panel with speaker amplifier operates the cabin speaker.
Figure 1 shows the antenna locations. The #1 VHF COMM antenna is a dipole. It is installed in the
leading edge of the vertical stabilizer. The #2 VHF COMM antenna is a 1/4 wave whip. It is
installed below the bottom skin of the fuselage. The antenna ground plane is copper adhesive tape.
The ground plane connects to the airplane static bonding system.
Figure 1: Antenna Locations
GPS
Marker (Left)
Marker
(Option)
VHF COMM 2
(Option)
VHF COMM 2
(Option)
Transponder
Transponder
VHF COMM 1
NAV
NAV
Communications
DA20-C1 AMM
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30 Dec 1997 23-10-00 Doc # DA201-C1
Rev. 0
Figure 2: Bendix\King KX 125 NAV COMM
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 0 23-10-00 Page 3
19 Dec 1997
2. Description
A. Bendix\King KX 125 NAV COMM
Figure 2 shows the KX 125 NAV COMM. The KX 125 is a communications transceiver and
navigation receiver. See Chapter 34-50 for data about the navigation functions. The equipment
can receive COMM signals from 118.00 MHz to 136.975 MHz in 25 kHz increments. This gives
760 channel operation.
The left hand display panel shows COMM frequency data. The top line shows the active COMM
frequency. The bottom line shows the SBY frequency. When the equipment transmits, a TX
annunciator comes on next to the active COMM frequency.
The KX 125 has these controls:
− An OFF/PULL TEST switch.
− COMM frequency selector knobs.
− A COMM frequency transfer button.
The press-to-transmit buttons on the pilot’s control sticks (or hand mic) control the transmitter.
The transmitter can be keyed for a continuous period of 30 seconds. After 30 seconds the
transmitter stops transmitting and the COMM frequency display flashes. This gives protection
against a sticking mic key (press-to-transmit button). Releasing the mic key returns to the usual
operation.
The OFF/PULL TEST rotary switch controls power to the equipment. The full counter-clockwise
position is OFF. Movement clockwise gives volume control. The KX 125 has automatic squelch.
Pull the switch to cancel the squelch for test purposes.
To change the frequency, turn the large frequency selector knob for 1 MHz increments. Turn the
small frequency selector knob for 50 kHz increments. Pull the small knob out to set 25 kHz
increments. When you turn the selector knobs, the SBY frequency changes. Push the COMM
frequency transfer button to toggle the active and SBY frequencies.
To operate the unit set the GEN/BAT switch and AVIONICS MASTER switch to ON. The related
circuit-breakers must be closed. Turn the COMM OFF/PULL TEST knob clockwise from the
OFF position. The display will show the frequency last stored in the non-volatile memory. You
can enter frequencies directly to the active display. Push and hold the COMM frequency
transfer button for more than 2 seconds. The SBY display will show the blank symbols (---).
The frequency selector knobs will control the frequency in the active display.
Communications
DA20-C1 AMM
Page 4
30 Dec 1997 23-10-00 Doc # DA201-C1
Rev. 0
Figure 3: Bendix\King KLX 135/135A GPS COMM
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 0 23-10-00 Page 5
19 Dec 1997
B. Bendix\King KLX 135\135A GPS COMM
Figure 3 shows the KLX 135\135A GPS COMM. The KLX 135\135A is a VHF communications
transceiver and a GPS receiver (See Chapter 34-50 for the GPS functions). The equipment can
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