[time-nuts] On choosing reasonable synthesizer PN requirements

[Bob kb8tq]

Hi

The “wiggles” he is chasing are about 2-3 Hz (by eyeball on his charts). At 2.4 GHz, 
that is a fairly convenient ~1 ppb. The Z-3801 (if it was in good health) should be easily
able to hold that level of performance. It’s not clear which MD-011 he is using, but it is
a pretty good bet it will also hold that level as well. The usual disclaimers about good 
satellite view for the GPSDO’s would of course apply. 

Substituting a typical telecom Rb for either device would likely also allow the wiggles
to be observed (or not). That would take out the whole dependence on GPS. 

(Yes I realize those comments are probably better directed to those involved ….).

Bob

> On Apr 24, 2020, at 6:52 AM, David J Taylor via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> From: Karen Tadevosyan via time-nuts
> 
> Hi,
> 
> one of the interesting HAM radio topic in Europe now is the use of the new
> geostationary satellite Phase-4A (QO-100) for analog and digital modes via a
> 2.4/10 GHz transponder.
> []
> =======================================
> 
> ... and Time-Nuts may be interested in some oscillator measurements made by Daniel Estévez showing some unexpected steps.  His blog is here:
> 
> https://destevez.net/2020/04/wiggles-in-the-qo-100-local-oscillator/
> 
> It's  a fascinating story, and may not yet be complete.
> 
> Daniel is a GNSS Engineer by occupation.
> 
> Cheers,
> David GM8ARV
> -- 
> SatSignal Software - Quality software for you
> Web: http://www.satsignal.eu
> Email: david-taylor at blueyonder.co.uk
> Twitter: @gm8arv 
> 
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