[time-nuts] Realistic Tbolt phase noise

Robert Atkinson robert8rpi at yahoo.co.uk
Tue Mar 9 13:49:44 UTC 2010


I think the TAPR supply was selected on cost and availabilty, not perfomance.
I seem to recall reliability problems too. I'd test it with a good linear PSU before putting blame on the Tbolt!
 
Robert G8RPI.

--- On Tue, 9/3/10, Christophe Huygens <Christophe.Huygens at cs.kuleuven.ac.be> wrote:


From: Christophe Huygens <Christophe.Huygens at cs.kuleuven.ac.be>
Subject: Re: [time-nuts] Realistic Tbolt phase noise
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Tuesday, 9 March, 2010, 12:50


This is with the power supply as provided by TAPR so should be ok.

Xtof.


On 09/03/10 13:44, Bob Camp wrote:
> Hi
>
> Power supply noise would be the first thought.
>
> Next up would be grounding inside the Thunderbolt (card to case, connectors to case).
>
> Bob
>
>
> On Mar 9, 2010, at 7:32 AM, Christophe Huygens wrote:
>
>    
>> Hi,
>>
>> I noticed several vendors on Ebay have the t-bolt on sale.
>>
>> However, the once showing their own PN plots seem to get only
>> -115, -120 dBc/Hz at 100Hz. Yet,
>> http://www.leapsecond.com/pages/tbolt/noise.htm seems
>> to have mucht better results: up to -150 depending on
>> power supply.
>>
>> By multiplying to 1GHz I also seem to be getting something
>> like -75 or - 80 rather than -110.
>>
>> Any thoughts?
>>
>> Christophe
>> on4iy
>>
>>
>>
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>
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