[time-nuts] On choosing reasonable synthesizer PN requirements

[David J Taylor]

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
========================================

If you follow his Twitter feed:

  https://twitter.com/ea4gpz

I think it's all but certain that it's the local oscillator in the 
satellite-borne transponder is the cause of the problem.  He's looked at an 
engineering beacon on the satellite too.  The orbital calculations involved 
need to be quite accurate.

I thought it might interest those chasing the ultimate precision!

Probably ought to change the title of this topic, but I'm unsure of the 
protocol here about so doing.

Cheers,
David
-- 
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-taylor at blueyonder.co.uk
Twitter: @gm8arv