[time-nuts] GPSDO Alternatives
lists at rtty.us
Fri Dec 7 00:35:34 UTC 2012
The simplest phase detector does indeed work. It just does not work very well. Not correcting the oscillator at all works, you will have time and frequency to some level of accuracy. Not correcting it at all is a whole lot cheaper and simpler.
On Dec 6, 2012, at 7:30 PM, Chris Albertson <albertson.chris at gmail.com> wrote:
> On Thu, Dec 6, 2012 at 4:09 PM, dlewis6767 <dlewis6767 at austin.rr.com> wrote:
>> could you not add just a little 'glue' outside the uP to relieve it a tad.
>> Let the GPS' 1pps gate some ttl counters and then read for overflow or
>> underflow after xxx seconds. Have the uP determine dac correction setting
>> back to the TXCO.
> That is why my first post was to ask "What is the simplest phase defector
> that can work?" I think you only need a one-bit counter. A flip-flop
> will do that. The FF is a classic phase detector used in many PLL
> Chris Albertson
> Redondo Beach, California
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