From: Peter Vince <[EMAIL PROTECTED]> Subject: [time-nuts] Buffering the 1pps output from a Z3801A Date: Wed, 26 Mar 2008 13:29:36 +0000 Message-ID: <[EMAIL PROTECTED]>
> Bruce, et al, > > The 1pps output of an HP Z3801A and Trimble Thunderbolt is > only available (as far as I know) as a balanced ECL signal on the > 25-pin connector, with dire warnings in the manuals about not > earthing either side of the ECL signals. Would you be able to advise > on a simple buffer circuit that would allow me to drive the usual > unbalanced 50-ohm coax please? Look at the side-car project for the PPS output. You can skip the NE555 if you don't need the pulse-length thing. A single RS-485 receiver should do it. Notice how both the positive and negativ signal is DC terminated as this is what you need for a PPS signal. Come to think of it, I need to cook up something similar for my Z3801A too. Another project in the heap of projects. Hurray! There are times when real ECL outputs are nice too. If I had any suitable ECL buffers lying around I would provide ECL output buffers too. Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
