Thanks Magnus. I see that parts for this board are only available from alternate sources. So, I ordered an A8 board from ebay last night. If it's no good, then I plan to replace U6, then U2, then U3 as soon as I can get the chips. I feel like there's something wrong with the OXCO path, anyway, though it's also possible that the big spikes come from the 10811.
Bob -------------------------------------------- On Wed, 3/23/16, Magnus Danielson <[email protected]> wrote: Subject: Re: [time-nuts] 5370A clock buffer board jitter/noise? To: [email protected] Cc: [email protected] Date: Wednesday, March 23, 2016, 1:09 AM Bob, While I don't think it may be the source of your 500 ps issue, if you dig in the archive you can find a post where I disabled the signal detect circuit which spews out 5 MHz spikes. It's a relative easy mod and you can revert it, so that is at least one thing to test. Cheers, Magnus On 03/23/2016 04:37 AM, Bob Stewart wrote: > I started getting noise spikes of up to 500ps on my 5370 the other day. When I switch to external clock and use the PRS-45A, the noise goes away. In fact, the noise issue is way better than with the 10811. I swapped in a different 10811, and the noise doesn't seem to have returned, but it was intermittent, so I may not have waited long enough. However, even when the 500ps spikes aren't there, both 10811s have too much noise, compared to the PRS. So, is there some common cause for this on the clock buffer board that anyone's run into? > > Also, I did pop the bottom off the 10811 from the 5370, and I noticed that the thermal fuse seems to have very thin wires compared to the socket holes it plugs into. Could this be a source of additional noise? > > Bob - AE6RV > _______________________________________________ > 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. > _______________________________________________ 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. _______________________________________________ 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.
