[time-nuts] 10811 foam enclosure

Don Latham djl at montana.com
Sun Jan 9 21:18:49 UTC 2011

Try suspending the tbolt mounted on block from string in a small cooler
chest (6-pack size will do nicely). It should come into balance with the
interior walls. Strings can be adjusted for best gravity response. use
very fine wire for connections.

> A simple box is fine for many Tbolt applications.
> Much depends on the TBolt Osc and what setting you have, especially the TC
> and damping.
> With the factory default setting you can pretty much put the thing in an
> outside unsheltered shed and have it work OK,
> But it will not be the best it can be.
> The object is to slow the frequency control loop down as much as possible
> so
> it does not transfer the short term GPS noise to the osc.
> The slower the temperature changes the less the loop has to work and the
> higher the TC can be set.
> Do the same test with the Tbolt's TC set to 1000 seconds, damping to 1.2
> and watch the phase error using Lady Heater.
> You'll see BIG BIG differences based on the rate of change of the
> temperature.
> ws
> *****************
> Mark Spencer mspencer12345 at yahoo.ca  wrote:
> My experiences placing my thunderbolt board in various insulated
> containers
> show little or no improvement over simply putting a cardboard box over it
> to
> keep drafts away.   As time allows I'm going to re run some of the tests
> using my 5370 and an external standard vs relying on the data from the
> thunderbolt itself but I'm not expecting to see any significant changes.
> I've also started to run some tests with disciplining turned off on the
> thunderbolt and the drift of the ocxo is quite apparent.
> I'll likely get a heavy die cast box for my thunderbolt at some point.
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"Neither the voice of authority nor the weight of reason and argument are
as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell

Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304

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