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I have an mt3 with ac3 card and ts-64 decoder.
works great.

COS or actally RUS goes from high, no signal, to low on
receiving carrier and proper PL. This uses an RC210
arcom controller. I want to use a different controller
that requires 0 volts no signal, and hi on valid carrier
and PL.

I can use a 2N2222 to change the RUS logic, but was
wondering if there is a jumper in the AC3 to do this?

Thanks

--
Ramon Gandia AL7X
Nome, Alaska USA

Hi Ramon,
I have worked with many AC-3 audio cards, I am quite sure that there are no jumpers that will switch the logic on the COS signal.
You can change whether DTMF control of the COS signal will turn off/on the COS signal with a valid DTMF string. This requires
that a DTMF card is installed.
Will be interesting to see if anyone else chimes in with a different answer.
Mike VE7SML