[time-nuts] GPS Locked and Unlocked Performance Comparison

Magnus Danielson magnus at rubidium.dyndns.org
Thu Feb 14 01:18:48 UTC 2008


From: Bruce Griffiths <bruce.griffiths at xtra.co.nz>
Subject: Re: [time-nuts] GPS Locked and Unlocked Performance Comparison
Date: Thu, 14 Feb 2008 14:14:37 +1300
Message-ID: <47B395FD.7080107 at xtra.co.nz>

> Magnus Danielson wrote:
> > From: SAIDJACK at aol.com
> > Subject: Re: [time-nuts] GPS Locked and Unlocked Performance Comparison
> > Date: Wed, 13 Feb 2008 19:43:58 EST
> > Message-ID: <bf7.298c42dd.34e4e8ce at aol.com>
> >
> >   
> >> Hi Magnus,
> >>  
> >> yes filtering is easier at 10KHz than 1Hz; I wonder how much of the 10KHz  
> >> modulation signal is getting through into the phase noise at the 10MHz  output.
> >>     
> >
> > For a standard 6 dB loop-filter it balances out nicely on the slope.
> > The gain is on shifting the frequency. 
> >
> > I have had great succsess in reducing the phase noise by shifting the
> > comparision frequency upwards in a similar fashion.
> >
> > I prefer a SR-flip-flop over XOR gate.
> >
> > Cheers,
> > Magnus
> >
> > _
> An XOR gate is better behaved with a noisy reference signal.

Yes, but these signals isn't particularly noisy.

Cheers,
Magnus




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