The PN should be considerably lower than that even with the noisy output buffer 
the PN floor should be considerably lower (>40db lower). The OCXO by itself 
should have somewhat lower PN.
Bruce 

    On Sunday, 18 September 2016 11:14 PM, David C. Partridge 
<david.partri...@perdrix.co.uk> wrote:
 

 Thanks, that makes sense.  Is the PN plot much as expected, or is it "could do 
better"?

Thanks again
Dave
-----Original Message-----
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus 
Danielson
Sent: 18 September 2016 11:56
To: time-nuts@febo.com
Cc: mag...@rubidium.se
Subject: Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz 
from signal.

Hi,

On 09/18/2016 12:26 PM, David C. Partridge wrote:
> The local power is 50Hz, so I can understand the 100Hz spurs, but I 
> don't quite "get" where the 200Hz spurs are coming from.  Or is that 
> just BAU harmonics?

Consider full-wave rectification of 50 Hz, the power consumption load on the 
capacitor after the rectifier creates an inverse sawtooth wave of
100 Hz, and sawtooth waveshape have both even and odd harmonics.

While much of this is regulated out in the next step, some of it makes it 
though.

Cheers,
Magnus

>
>
> Thanks
>
> Dave
>
>
>
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