Diamond Aircraft DV 20 KATANA, Maintenance Manual

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AIRCRAFT
DV 20 KATANA AMM
Communications
Doc # 4.02.02
Rev. 13
23-10.2
Page 3
15 Dec 2018
KX125
Intercom Switch
Speaker / Headset
Microphone / Headset
Transmit Button
Circuit Breaker
Antenna
2. System Description
A. Receiver Description
The high frequency signal received by the antenna arrives via a coaxial cable at the antenna input
of the radio unit. It is selected, amplified, demodulated, and fed to the speaker or headphones as
a low frequency signal.
The required volume can be adjusted using the volume control.
The automatic squelch control suppresses any signal noise in the speaker or headphone in the
event that the HF carrier voltage at the antenna input is not sufficient. It can be deactivated by
pulling the PULL TEST switch.
B. Transmitter Description
The radio unit is automatically switched to transmit mode when the transmit button is pressed. The
signal received by the microphone is directed to the transmitter unit, amplified, and modulated to
a high frequency carrier signal which is then sent by the antenna.
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Figure 2: KX125 Unit, Functional Diagram