[time-nuts] Thunderbolt mounting

[Said Jackson]

Sorry guys, but using a fan on a thunderbolt is nuts. Not time nuts.

First you get ADEV humps as discussed here. Then the fan vibrations will show up as massive spurs in the phase noise plots. Then the fan's commutator emi will go everywhere. Then the fan may modulate the supply voltage going into the thunderbolt if the same supply is used -not good.

Get a better docxo and replace the thunderbolt oven, done. If you need the best thermal stability. Shield it from airflow as best as possible. That should do it.

Bye,
Said

Sent from my iPad

On Jul 12, 2012, at 12:05, Chuck Forsberg WA7KGX N2469R <caf at omen.com> wrote:

> Sorry about the bad URL. I corrected it below.
> On 07/12/2012 12:22 AM, Chuck Forsberg WA7KGX N2469R wrote:
>> I mounted mine in a cabinet along with a power line filter
>> and power supply.  Pics at www.omen.com/wa7kgx/ham.html
>> The filter is important if you are a ham or SWL.
>> 
>> The temp hangs around 35C.  The cat likes to sit on it as it
>> is slightly warm.
>> 
>> The Rb oscillator and its 15 volt power supply have been
>> removed.
>> 
> The Tbolt in its cabinet currently sits atop my office computer,
> next to a south facing window.  Putting it in a dark corner would
> doubtlessly improve its temperature stability but the cat would be
> disappointed.
> 
> -- 
> Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
> Developer of Industrial ZMODEM(Tm) for Embedded Applications
>  Omen Technology Inc      "The High Reliability Software"
> 10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430
> 
> 
> 
> <tbolt.gif>
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