[time-nuts] Fwd: Dusty 53131A

Scott Stobbe scott.j.stobbe at gmail.com
Sun Mar 5 14:54:36 EST 2017

Recently the fan in my 53131 has been making a pretty awful sound, so its
time to replace it. When I disassembled the counter I found the trim cap
had turned into a fur ball. Not that it really matters since it runs on an
external reference, but its interesting to see if the dust has any effect.
See https://www.flickr.com/photos/147407087@N06/32427230764/. So with the
unit disassembled I logged the effect of removing the dust by logging a
GPSDO during the cleaning process.

Must of the dust was around the shroud of the trim cap. Near the mounting
terminals there was fairly minimal amounts of dust. At least in this
instance, if the dust had any impact on frequency, its orders of magnitude
below the thermal instability of the AT crystal.

The crystal appears to be in a to-39 3-lead package. It is also
freestanding directly in front of the exhausting cooling fan...
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