On Sun, Sep 9, 2012 at 1:14 PM, <[email protected]> wrote: > True for a cheap oem navigation receiver. Not true for a geodetic quality > receiver, who usually have some options (external frequency input, PPS_in) > to make them the best timing receivers available. However they are much > more expensive than the typical single frequency timing reciver.
I looked at every link and can't see where they give a timing accuracy spec on the PPS with respect to UTC. Possition accurracy is very good and we might assume the timing is as good. But they don't say it is. What's interesting is these GPSes will accept an accurate clock input in order to give better location data. That is the opposite of a timing GPS where you tell it accurate location data so that it can get better timing. Cutting down the unknown in one lets you do better in the other. I assume these all cost well over $50. You can get a pretty good timing GPS for $30 and it WILL have the PPS error specified. To the OP. None of this matters a lot because PPS is a standard input signal. It is easy to swap out a GPS receiver later. Same with the OCXO. From a control point of view they are all pretty much the same. You can swap them out later Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
