[time-nuts] GPS timing receivers
M. Warner Losh
imp at bsdimp.com
Tue Oct 25 14:19:29 EDT 2005
In message: <8804.1130262966 at critter.freebsd.dk>
"Poul-Henning Kamp" <phk at phk.freebsd.dk> writes:
: In message <20051025.114507.13025778.imp at bsdimp.com>, "M. Warner Losh" writes:
: >In message: <435E6BA2.8000906 at erols.com>
: > Chuck Harris <cfharris at erols.com> writes:
: >: Because PPS isn't encoded in the loran signal. The only way you
: >: have of recovering PPS information is to know when the next time of
: >: coincidence (TOC) will occur at your location, and start your 1PPS
: >: at that time. A TOC is when your master chain's starting pulse
: >: happens to occur at an exactly the start of a UTC second.
: >So timing LORAN-C receivers only look at one LORAN-C chain then?
: Very few LORAN-C receivers are multi-chain.
: I belive the Austron 5000M was multi-chain (and took a PDP/11 ?)
: Megapulse have some multi-chain receivers as well.
Ah, not they couldn't do this, they just don't. I undestand now why
they have a PPS input.
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