[time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Bob kb8tq kb8tq at n1k.org
Fri Jan 26 16:00:13 EST 2018


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 _ <bpl521 at outlook.com> wrote:
> 
> Which would be the preference as timing receiver Motorola Oncore or a Trimble Resolution T ?
> 
> 
> -=Bryan=-
> 
> 
> ________________________________
> From: time-nuts <time-nuts-bounces at febo.com> on behalf of Pete Stephenson <pete at 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
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