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

Stephen Tompsett stephen at tompsett.net
Mon Jan 22 11:55:02 EST 2018

Why not consider a more recent current UBlox module?

e.g. the M8T  https://www.u-blox.com/en/product/neolea-m8t-series

A quick internet search will find several suppliers of ready made

On 22/01/2018 15:38, 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 far as I can tell there are a few common options. One is the Trimble
> Resolution T (or SMT), that should be good and proven. The major
> annoyance is converting the 3.3V TTL serial logic-level to RS232, but
> should be doable with a MAX3232 and a few capacitors.
> Another option is this UBLOX LEA-5T:
> https://www.ebay.it/itm/291769145465
> The seller advertises an RS232 output pin, but I'm not sure it's
> actually available, and I'd need at least lines, one for the NMEA
> strings and one for the 1PPS signal. So, even if a RS232 TX pin is
> actually there, it is probably not enough to build a good reference
> clock, and I'd still need to convert some TTL levels to RS232...
> Does anybody have experience with this receiver?
> How does it compare to the Resolution T/SMT?
> Another option is the Trimble Thunderbolt. This seems to do exactly what
> I need, but it costs at least ten times more than the other modules.
> Beside coming with a ready to use RS232 port and a nice case, does it
> have other advantages?
> Am I overlooking something or missing interesting options?
> Cheers,
> Paride IZ3SUS
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Stephen Tompsett

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