wpxs472@gmail.com said: > Hal, I can't communicate with it. That has been gone for a while now. I assume it worked at some point. Did talking to it stop working at the same time the frequency stopped tracking? If so, I'd guess the CPU inside has stopped working and isn't setting the DAC correctly. -- These are my opinions. I hate spam.

Hi Basic troubleshooting: Check the regulator output voltages and repair as needed. Basic serial troubleshooting: Bring up a terminal program, loop back the serial with a jumper, see if you have a connection. If you do, issue basic commands, see what happens. Switch to likely baud rates repeat basic commands. If still nothing, put a scope on the RX output of the serial chip in the 3801. Do the same for the TX input of the same chip. …… dig on in from there. Bob > On Mar 4, 2018, at 9:22 PM, Hal Murray <hmurray@megapathdsl.net> wrote: > > > wpxs472@gmail.com said: >> Hal, I can't communicate with it. That has been gone for a while now. > > I assume it worked at some point. Did talking to it stop working at the same > time the frequency stopped tracking? If so, I'd guess the CPU inside has > stopped working and isn't setting the DAC correctly. > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.