There is a PC-based ham radio communications protocol which sends a series of tones for about 15 seconds seconds. Then for the next 15 seconds it "listens" to tones from the other station. After two more 15 second bursts the PC then records the exchange between the two stations.
What I want is for the audio from the PC (those tones) to do two things: feed audio to an HTX-10 ham radio (this is straight-forward, already designed a pad) but the second part is where I'm having trouble. I want the audio to also trigger a circuit (a VOX, perhaps?) which will provide +12 to the resistor in the relay circuit. (The relay is needed because in receive, the radio requires mic pin 2 to be grounded, with pin 3 NC. To transmit, pin 2 become NC and pin 3 goes to ground.)
Hope I've explained this well enough. I tried to do this with a 555 in monostable mode, but was unable to make it work. All ideas are welcome.
What I want is for the audio from the PC (those tones) to do two things: feed audio to an HTX-10 ham radio (this is straight-forward, already designed a pad) but the second part is where I'm having trouble. I want the audio to also trigger a circuit (a VOX, perhaps?) which will provide +12 to the resistor in the relay circuit. (The relay is needed because in receive, the radio requires mic pin 2 to be grounded, with pin 3 NC. To transmit, pin 2 become NC and pin 3 goes to ground.)
Hope I've explained this well enough. I tried to do this with a 555 in monostable mode, but was unable to make it work. All ideas are welcome.