>> I got the impression that the extra $50 you pay for the Garmin receiver is money >> well spent on a well-engineered device.
> or a ublox, or a trimble, or... always check the datasheet Does anybody have suggestions for low cost GPS units to use for timekeeping? No wiring preferred. The Garmin GPS 18 is the best candidate I know of. The LVC version includes PPS but requires minor soldering. The USB version doesn't have a PPS but it works reasonably well without any soldering. It's not supported by the officiall ntpd distributions, but I have a driver. It's not microsecond quality, but low milliseconds. The SiRF chipset is used in many low cost brands. Their latest version, III, is much more sensitive than the Garmin GPS 18. Most units I've seen are USB. Unfortunately, the NMEA output isn't well synchronized so it isn't very good for timekeeping. I took the cover off a BU-353. There is a PPS signal on the chip set, but no extra wire in the cable. It might be possible to free up the power return wire by using the shield. I haven't tried it. The Globalsat MR-350 is a RS-232 version with PPS. It comes with a funny connector and is slightly more expensive. It's easy to replace their connector. I haven't done detailed tests on the PPS. The NMEA signals are as crappy as all the other SiRF units. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ 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.
