Hi Which ever you can get for the least money. Anything much over $10 is probably “over budget”.
Bob > On Jan 26, 2018, at 3:57 PM, Bryan _ <bpl...@outlook.com> wrote: > > Which would be the preference as timing receiver Motorola Oncore or a Trimble > Resolution T ? > > > -=Bryan=- > > > ________________________________ > From: time-nuts <time-nuts-boun...@febo.com> on behalf of Pete Stephenson > <p...@heypete.com> > Sent: January 26, 2018 12:48 PM > To: Paride Legovini; Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / > Ublox / other?) > > On 1/22/2018 4:38 PM, Paride Legovini via time-nuts wrote: >> Dear fellow nuts, >> >> I plan to build a decent GPS/GNSS-based Stratum 1 NTP server, and I'm >> looking for a good and possibly affordable timing GPS receiver. > > As others have pointed out, NTP over the internet isn't usually more > accurate than several tens of microseconds, so you have a lot of > flexibility in the receiver you choose. > > If you need something that's simple to interface, has RS-232 polarity > signals, and is generally plug-and-play, the Garmin GPS 18x LVC is a > good choice. It's robust, compact, and easy to wire to whatever device > you want: in my case, I use a USB-A male plug connected to a USB port on > my time server to provide the required 5V power and have the serial and > PPS lines connected to the server's hardware serial port. > > It's not strictly a timing receiver with a position hold mode, but it > does produce a PPS output +/- 1 microsecond, and can do "position > averaging" so it doesn't drift around more than a few meters when > stationary. > > It can output data in either NMEA format or the Garmin binary format, > which is well-documented and supported by GPSd. Garmin's made the > receiver for many years and has generally worked out the kinks with a > bunch of firmware updates over the years. > > Another alternative is the rather older Motorola Oncore UT+ receivers > one can get on eBay for about $15 USD. No longer supported by the > manufacturer and with hardware of unknown age, it might not be the best > choice for critical systems. Still, they're true timing receivers with > sawtooth correction, are easy to power with 5V, output TTL serial (so a > MAX(3)232 can easily convert the data to RS-232 polarity) and a PPS > signal, and are well-supported by NTPd. The Oncore driver for NTPd is a > bit chatty in terms of what it logs every second, but that's easy enough > to deal with. They're cheap enough to get a few to play with. > > Cheers! > -Pete > > -- > Pete Stephenson > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > time-nuts Info Page - American Febo > Enterprises<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > www.febo.com > time-nuts is a low volume, high SNR list for the discussion of precise time > and frequency measurement and related topics. To see the collection of prior > postings to ... > > > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.