Garmin GNC 250 Bakım ve Onarım Kılavuzu - Sayfa 11

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Figure 5. Communication Transceiver Block Diagram

The VHF transmitter is a 3 stage RF power amplifier capable of delivering 5 watts minimum of CW

power to the antenna connector. The input to the transmitter is supplied by the receiver

synthesizer and is amplified from a level of 100 mW to the final output of 5 watts. The receiver board

AM modulates the transmitter using microphone input via the J2 connector to collector modulate the

final two stages of the transmitter through power transistor Q34.

The microphone circuits contain a compressor which limits the AM modulation depth over a 20 dB

microphone input range. In addition to the communications functions, the receiver board contains

the Gillham/Greycode altitude decoder circuitry. Encoded pressure and altitude data from a parallel

altimeter device is received as a 10 bit data word at the 26 pin J2 connector. The data is decoded and

output to the CPU via connector J13.