Sound card interface is a equipment for communication. Any mode using a computer for encode or decode data should be interface for control transceiver. I brought a cheap USB sound card at computer store. Then come to my workbench to making its.
A circuit is simple. Audio output from USB sound card direct to port for connect to mic of transceiver. At a same time audio signal going to control NPN transistor. A transistor I use 2n3904 for switch or control PTT port for transceiver.
I can find many circuit on internet. VOX control is use for this sound card interface.
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