This subject has come up several times this past month.
The function of vox is already built-in.

usbradio.conf

carrierfrom=vox        ; no,usb,usbinvert,dsp,vox


Perhaps I have not understood the questions correctly?
But there is plenty of diagrams on a google search if you need to build one.

...mike/kb8jnm


> Does anyone have a circuit that will take audio from a radio and generate
> a pseudo COR signal for the URI-x? If so would you share the circuit
> diagram?
> TIA Steven Donegan
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