[time-nuts] Z3805 two frequency maxima

[Volker Esper]

So let's have a look into the machine... and what do we see? There's a 
nice little Symmetrcom oven, with the sign reading "5.000 MHz" - bingo!

May be there's a time saving way to determine the energie of the sub 
harmonic: using my spectrum analyzer. It tells me, that there's a 5 MHz 
subharmonic at the level of -62dBc.

How would you have calculated the energy? What would be your ansatz?

Thanks so far

Volker


Am 17.11.2012 17:55, schrieb Bob Camp:
> Hi
>
> That's what you get if you have "sub harmonic" energy in the output of your OCXO. I'd bet you a warm glass of beer that you have a 5 MHz / doubled to 10 MHz MTI OCXO in your Z3805.  If you have a lot of time on your hands, you can calculate the likely level of the energy from the amount of jitter (spacing between the two peaks) you get.
>
> Bob
>
> On Nov 17, 2012, at 11:41 AM, Volker Esper<ailer2 at t-online.de>  wrote:
>
>> Hi,
>>
>> while playing with my recently aquired TIC (SR620) and measuring the period time of some oscillators I discovered something I hadn't expect at all:
>>
>> The output of my GPSDO (Z3805) writes two maxima in the period histogram (at a spacing of 60ps).
>>
>> I didn't believe that result and assumed an inherent error in my measuring setup or the counter itself.
>>
>> So I plugged another oscillator, the reference TCXO of my signal generator (R&S SMX), and that result made me happy and uneasy at once: The TCXO hat only one maximum.
>>
>> I havn't calculated the ADEV curve, yet.
>>
>> See pictures.
>>
>> Why does my GPSDO produce such a weird result?
>>
>> Cheers
>>
>> Volker - DF9PL
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