[time-nuts] Trimble Thunderbolt baseplate size (mass)

[EWKehren at aol.com]

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.
Bert Kehren
 
In a message dated 7/25/2017 9:06:28 A.M. Eastern Daylight Time,  
kb8tq at n1k.org writes:

Hi

It  gets back to the term “optimum performance” and the Time Nut bias 
towards  eliminating any source of degradation. Even while locked, 
temperature
does  get into the DAC. Blow some air on a unit and watch things move 
around. 
It  does not go unlocked. It does not exceed any of the specs on it. It 
does  move
a bit and you can see the “bump” in a phase plot. Simply blocking  drafts 
is a good
first step.

Bob

> 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?
> Regards
> Paul
>  WB8TSL
> 
> On Mon, Jul 24, 2017 at 8:12 PM, Bob kb8tq  <kb8tq at n1k.org> wrote:
> 
>> Hi
>> 
>>  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.
>> 
>>  Bob
>> 
>> 
>> 
>>> 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.
>>> 
>>>  Thanks,
>>> 
>>> Norm n3ykf
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