[time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit
Hal Murray
hmurray at megapathdsl.net
Wed Dec 20 00:55:34 UTC 2006
> Noise like the oncore sawtooth isn't always a bad thing.
I was going to comment on that area... Thanks for the reminder.
The problem is that the sawtooth isn't noise in the normal Gaussian sense.
If you happen to hit a long/wide hanging bridge, the resulting offset may get
past your PLL filter.
It might be possible to avoid hanging bridges by dithering the sawtooth. I'm
thinking of something like a heater under the xtal for the GPS unit that gets
driven by a medium frequency - slow relative to the normal sawtooth but fast
relative to the PLL time constant. This somehow feels not-good, but I can't
see the obvious screwup.
--
These are my opinions, not necessarily my employer's. I hate spam.
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