Scanner Carrier Detect for Teamspeak PTT

[bnjmik]

I designed this circuit to utilize Teamspeak's 'push to talk' feature rather than the VOX feature that can be unreliable and difficult to dial in.

I did not use any isolation in my setup as I don't care if the old equipment fails, but good engineering practice will employ a 1:1 audio transformer in the audio line and an optocoupler between the serial port and the voltage comparator, and the common ground tie will be eliminated.

bnjmik

 

[trooperdude]

Very nice work, but I've never had a problem with Teamspeak's vox option running
the audio through a Radio Shack 1:1 audio transformer into the sound card.

Seems like a lot of extra work.

 

[bnjmik]

It seems like it is a lot of work, but for me it wasn't that much. I've built repeaters and other remote control devices with radios, so this was just a specific implementation of the greater knowledge I've already learned as an engineer.

The specific purpose of this circuit, as my original intent, was to use two scanners, one fixed on a 'priority' channel, and the other scanning. I've never liked the way single-VFO receivers have to constantly check the priority channel. The circuit would switch a relay in the audio line from the scanner to the priority receiver whenever a signal came in on the priority line.

I still made use of this circuit with just one receiver because it removes the need to finely adjust VOX triggering levels and it helps to eliminate the leading-edge miss in the received audio because it triggers on the carrier instead of audio level.

bnjmik