The signal level is also very low.
Brue
On Sunday, 18 September 2016 11:47 PM, Magnus Danielson
<[email protected]> wrote:
The phase-noise still looks fairly high. How do you measure this?
Cheers,
Magnus
On 09/18/2016 01:27 PM, David C. Partridge wrote:
> Now that's interesting I just re-ran the measurement, and got a quite
> different result which is attached. The spurs have GONE.
>
> My only guess right now is that the E4406A power supply is getting quieter as
> it has been on for longer (I've only had it powered for short periods before
> now).
>
> Dave
>
> -----Original Message-----
> From: time-nuts [mailto:[email protected]] On Behalf Of Magnus
> Danielson
> Sent: 18 September 2016 11:56
> To: [email protected]
> Cc: [email protected]
> 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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