[time-nuts] retry: PRS10 has spurious frequencies

[Henk ten Pierick]

Hi Poul-Henning,

1. It is not a stupid question but a very valid one.

2. I was aware of the EMI possibility and tried ferrites on the  
supply and signal wires with no result.

3. I will try batteries but have to find enough of them.

4. On the spectrum analyzer, I checked the amplitude setting and 10dB  
change gave 10dB change of signal level. Also a mixer level change  
had no influence on the spurious.

Henk


On Apr 25, 2007, at 22:07, Poul-Henning Kamp wrote:

>
> I'm going to ask a seemingly stupid question, but bear with me:
>
> Are you sure those signals are really present on the output ?
>
> The reason why I ask is that you are in a frequency territory where
> EMI is both radiated and conducted so you have to be really careful
> with your setup, grounding in particular, to make sure you do not
> actually measure the PRS10 acting as an antenna.
>
> The best way to ensure this, is to run your PRS10 off batteries,
> Sealed Lead Acid for instance, and the only other connection to
> the PRS10 should be the coax to the spectrum analyzer.
>
> Poul-Henning
>
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by  
> incompetence.
>
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