That looks to be a Transcrypt board. Can you tell me what it says on the white paper?Most time, all you have to do is reinstall a jumper pr resistor on the receive and transmit audio paths. I'll look in our notes tomorrow and see what you have to do to install a transcrypt board into a 830. We install Transcypt boards into TK-790's all the time, that's the most modification we have to do.