Assuming the production SMT version is like the original through-hole version, the TX OUT pin is AC coupled. There is a 10 uF non-polarized capacitor and 33 ohm resistor between the output op amp and the interface connector.

On Jan 2, 2014, at 5:11 PM, KJ6KO <kj6ko@innercite.com> wrote:

Is the TX OUT audio on a RTCM AC coupled or do I need to install a coupling cap on it to connect to an audio input that has DC on it (MOTO)?

Thanks....Greg

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