[time-nuts] Trimble Thunderbolt baseplate size (mass)
EWKehren at aol.com
EWKehren at aol.com
Tue Jul 25 09:53:32 EDT 2017
Unlike Rb's Tbolts do not need a heatsink. The OCXO to some degree holds
the board temperature wise constant. We all know that walking past it we see
a change. That is not the OCXO but the board and our tests show that the
DAC which is not a DAC in the classical way has a 1 E-10 per C sensitivity.
No temperature or voltage control.
In a message dated 7/25/2017 9:06:28 A.M. Eastern Daylight Time,
kb8tq at n1k.org writes:
It gets back to the term “optimum performance” and the Time Nut bias
towards eliminating any source of degradation. Even while locked,
does get into the DAC. Blow some air on a unit and watch things move
It does not go unlocked. It does not exceed any of the specs on it. It
a bit and you can see the “bump” in a phase plot. Simply blocking drafts
is a good
> On Jul 24, 2017, at 8:33 PM, paul swed <paulswedb at gmail.com> wrote:
> Interesting discussion. I simply have my TBolt bolted onto an Aluminium
> rack panel so I could rack it. I wasn't aware there was any special need
> beyond that? Right?
> On Mon, Jul 24, 2017 at 8:12 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
>> The TBolt is a great unit !!
>> The main source of temperature impact is the DAC / Voltage reference.
>> Since that is a
>> “distributed” circuit, the temperature control also needs to cover more
>> than just the backplate.
>>> On Jul 24, 2017, at 6:37 PM, Norm n3ykf <normanlizeth at gmail.com> wrote:
>>> Hi all!
>>> Allowing a friend to borrow a tbolt.
>>> Is it necessary to cool (maintain a certain) baseplate temperature for
>>> optimum performance?
>>> Currenlty mounted inside an aluminum chassis. It's screwed to an
>>> aluminum sheet that covers around 2/3 the base.
>>> Norm n3ykf
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