Drake TR7 / TR7A Transmit Exciter Circuit Board - C3764W

The Transmit Exciter Board provides microphone audio amplification, controls the transmitter VOX functions, produces the modulated transmit IF frequency, and provides the +10 volt transmit/receive switching. Microphone audio from the front panel connector is sent to this board where the audio is amplified and sent to the balanced modulator input and the VOX circuits. The VOX circuit is controlled through the setting of three front panel controls, VOX Gain, VOX Delay and Anti-VOX. With these adjustment the VOX circuit is adjusted to key the transmitter with signal input from the microphone, controls the transmit delay, and prevents the receiver audio from keying the transmitter. The amplifier microphone audio feeds the balance modulator and mixed with the 5.645Mhz transmit IF carrier signal from the IF/Audio board to produce a modulated transmit IF signal. The output of the balanced modulator is then sent back to the Filter Board and through the 2.3Khz SSB filter to limit the signal bandwidth of the transmit signal.

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