[time-nuts] GPS Locked and Unlocked Performance Comparison

[Bruce Griffiths]

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.

Bruce