[time-nuts] GPS lock of the FE5680. Current experiment and question
lists at rtty.us
Sun Feb 12 20:48:54 UTC 2012
The sawtooth correction needs an accurately calibrated time offset measurement to work against. That's not a requirement for a simple loop. Not impossible to do, but it adds another constraint.
On Feb 12, 2012, at 3:05 PM, Chris Albertson <albertson.chris at gmail.com> wrote:
> On Sat, Feb 11, 2012 at 4:45 AM, Bob Camp <lists at rtty.us> wrote:
>> Another way to build an analog phase detector...
>> Next layer on the onion is how to get the sawtooth correction out of the GPS and into your loop.
> Assuming you have a uP in the loop the sawtooth is easy the GPS sends
> the value out it's serial port.
> I think a sample and hold could work as well as a time to voltage but
> the sample and hold that can work a 10Mhz will not be a cheap part
> while time to voltage cane made from parts many people already have
> and if not none of the part cost even 50 cents.
> I'm weeks away form getting this to work, today I hope to complete a
> fan controller to temperature control the box the Rb. lives in.
> Chris Albertson
> Redondo Beach, California
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