[time-nuts] Best Chance GPS module
holrum at hotmail.com
Wed Nov 30 16:36:47 EST 2016
I have found that the cheap V.KEL SIRF=III modules (I paid $15-$20 for three) have excellent indoor performance with their built-in patch antenna. They don't do GLONASS. I even get indoor tracking with the module sitting on the ground floor of a 2 story hose with the patch antenna facing the floor!
The NEO M8 is a decent device. I've seen mine tracking over 24 sats. The module that I have has a U.FL antenna connector with pads for adding an edge-launch SMA connector (I hate U.FL connectors). I seem to remember that they can't track GPS, GLONASS, and BEIDOU at the same time.
I have gotten surprisingly good performance with a cheap GPS/GLONASS puck like:
For NTP applications, multi-path errors will be swamped out by the "noise" in NTP. I don't think that a timing receiver adds much value except possibly the ability to still work with one or two sats visible. Many GPS/GLONAS/BEIDOU capable timing receivers don't do precision timing with more than one sat system type enabled... I think the Venus devices are like that... they only to GPS timing.
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