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The primary Microphone is a HiSonic MH-800.
The mic runs balanced into a Behringer MX602A preamp/mixer, to a Behringer DSP 1000P digital effects processor, to a Behringer MiniCom COM800 compressor, then into a Sony SEQ-430 9 band graphic equalizer, back to the MX602A, then to the radio line level input.
The Heathkit mic input section has been modified by clipping out the original audio amplifier circuit feeding the balanced modulator and adding a homemade Analog Devices SSM2019 mic amp circuit. This homemade amp is placed close to the balanced modulator. This mic input maintains original radio functionality, including VOX.
3/9/2007 A line level audio input circuit (-10dBv) was added in parallel to the standard mic input circuit (above). The line level audio is brought into the radio via unused pins on the 8-pin mic connector. The line level input bypasses the VOX keying circuit as well as the switching circuits that shut off the audio preamp circuits during TX operation and goes directly to the balanced modulator. It is required to manually turn down the mic gain control on the radio (front panel) when using the line level audio input.
