[time-nuts] HP5065a cfield issue

[djl]

Paul:  You can have some fun with this:
A vertical line  current flow in the neighborhood of 30,000 amperes, 
pulse risetime on the order of 2-5 microsec, fall time about 40. Kind of 
a giant magnetic play toy.
Don Latham

On 2020-12-03 11:23, paul swed wrote:
> Well Bob what an unusual comment about large magnetic fields. It just 
> so
> happens that maybe I actually had one about 8 weeks ago. Its called a
> lightning strike about 60' away. Just found the actual 100' pine tree 2
> days ago. I had been looking but it sounded like it hit in the opposite
> direction.
> The strike did wipe out a nvr and copper networking. But it did not 
> seem to
> impact the the cesiums or many many other pieces of equipment.
> The 5065 is still super stable.
> Regards
> Paul
> 
> 
> 
> On Thu, Dec 3, 2020 at 11:57 AM Bob kb8tq <kb8tq at n1k.org> wrote:
> 
>> Hi
>> 
>> I don’t believe that the quantum transitions are sensitive enough to 
>> minor
>> temperature
>> shifts to account for a 1 or 2 ppb sort of shift…..  Magnetic field, (
>> giant magnetic play toy
>> moved next to Rb … )  yes that will do the trick, but temperature … 
>> tough
>> to do …
>> 
>> Everything I can find that documents what’s what is behind this or 
>> that
>> pay wall. I’m
>> not $80 interested enough in the answer :)
>> 
>> Bob
>> 
>> > On Dec 3, 2020, at 10:51 AM, Poul-Henning Kamp <phk at phk.freebsd.dk>
>> wrote:
>> >
>> > --------
>> >
>> > Could it be the thermostat circuits have shifted so you run at a
>> > different temperature now ?
>> >
>> > --
>> > Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
>> > phk at FreeBSD.ORG         | TCP/IP since RFC 956
>> > FreeBSD committer       | BSD since 4.3-tahoe
>> > Never attribute to malice what can adequately be explained by
>> incompetence.
>> >
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>> 
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-- 
Dr. Don Latham  AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304