[time-nuts] Another "atomic" clock question
magnus at rubidium.dyndns.org
Thu Mar 6 15:24:22 EST 2014
You still get hanging bridges, but smaller in amplitude and for the same
oscillator stability much more short-lived.
On 06/03/14 00:03, Bob Camp wrote:
> If you are going to decode and use the sawtooth data out of the receiver, there’s no need to eliminate the hanging bridges. The sawtooth data does that for you already. Put another way, heating the receiver is *harder* than just using the decoded data….
> On Mar 5, 2014, at 9:53 AM, Mike M <timenuts at binsamp.e4ward.com> wrote:
>> Bob Camp wrote:
>>> Be careful of what you wish for.
>>> One way to eliminate the hanging bridge is to have the oscillator
>>> exactly on frequency. That sounds fine. The problem is that you
>>> are always in the middle of a bridge.
>> That's fine. Just set the oscillator to keep the bridge in the
>> middle of the range. It should be possible to detect the correct
>> frequency and phase by monitoring the sawtooth correction data from
>> the GPS.
>> Now you have eliminated the sawtooth error and no longer have to add
>> correction for it.
>> This will eliminate the quantization error in the sawtooth
>> correction data since it is no longer needed. If the 1pps loop is
>> properly designed, it should help the loop track the 1pps signal
>> more accurately.
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