[time-nuts] 5370A clock buffer board jitter/noise?
Bob Stewart
bob at evoria.net
Wed Mar 23 22:57:12 UTC 2016
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 <magnus at rubidium.dyndns.org> wrote:
Subject: Re: [time-nuts] 5370A clock buffer board jitter/noise?
To: time-nuts at febo.com
Cc: magnus at rubidium.se
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
>
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