[time-nuts] retry: PRS10 has spurious frequencies

Henk ten Pierick henk at deriesp.demon.nl
Sun Apr 22 15:52:44 EDT 2007


John,

The PRS10 has a phase noise spec of -130dBc at 10Hz distance. The  
only way for me to measure this is with a Wavecrest 2075 and the  
PRS10 was not a expected. It was not better than my R&S SMX. Trying  
to find out why I found the spurious which also are seen by the  
Wavecrest. I will filter the spurious out of coarse and re-measure  
but are at least surprised to find this frequency spectrum.
I know that there are more PRS10 owners with the time-nuts, I expect  
them to be phase-noise-nuts as well.

Henk



On Apr 22, 2007, at 20:47, John Ackermann N8UR wrote:

> Henk, I don't know particulars about the PRS10, but spurs anywhere  
> that
> are 60dB down are probably not a problem; check the docs and I'll bet
> that non-harmonic spurs are only spec'd at maybe 40dB down (and I'd
> argue that the 58th harmonic no longer counts as a harmonic; the
> harmonics they're talking about are low order).
>
> John
>
>
> Henk ten Pierick said the following on 04/22/2007 02:28 PM:
>> Hello,
>>
>> Sorry for the reply, hit the wrong button. But:
>>
>> The output spectrum of my just bought PRS10 has spurious frequencies
>> from 580MHz in steps of 10MHz up to 680MHz. The 580MHz and 680MHz
>> signals just above the noise. The 630MHz amplitude 60dB down the
>> 10MHz. Does anyone know if this a normal output?
>>
>> Henk
>>
>>
>>
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>
>
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