ZCZC For those of you with the Big Bird Dovetrons, or anyone who has a "Tempest" version, I have put together a small circuit that will adapt the MIL188 +/- voltage output for a HV TTY loop. I have it in a WORD document, so I can send it to anyone who wants it. Just shoot me an email. Wish I had the time to get a website up... 73, Jack WA2HWJ NNNN