KD2AVU vox interface

Audio between radio receiver/transmitter isolated by 2 * 600/600 ohm transformers with vox circuit for push to talk operation. Vox delay can be set by R12, audio from radio receiver to computer is adjusted by R14, computer speaker output audio adjusted by R10, vox gain adjusted by R9. The vox circuitry is powered by computer USB 5v. This circuit can be used to decode slow scan TV, digital modes or can be used to computer audio out over the radio via the microphone connection.