[time-nuts] GPS for Nixie Clock
hewball at hewball.com.au
Mon Jul 11 21:41:42 EDT 2016
if you are considering the MAX Series of chip i just posted this version I’ve been using for my own NTP sources for pool.org servers
board i designed for the beablebone should be cheap enough to get made if someone wants to, or if you are in Australia i can ship boards cheap enough
> On 12 Jul 2016, at 8:32 AM, Bob Camp <kb8tq at n1k.org> wrote:
> The T version makes it easy to get at the sawtooth correction on the pps. That lets you go from 10’s of ns on the pps to below 1 ns. All of that is a
> bit beyond the response speed of a Nixie tube.:). It also takes an MCU to work out what’s going on and some way to incorporate the correction in
> the output.
>> On Jul 11, 2016, at 7:54 PM, John Swenson <johnswenson1 at comcast.net> wrote:
>> I take it the "T" is a time specific version, I see there is also a NEO M8T, I presume this include the position hold etc?
>> Seems like an interesting board with a NEO-M8T, a UF.L antenna connector. The little breakout board gives a direct USB interface as well as timing signals. With the USB it looks like it should work with the U-center software for evaluation and configuration which would probably make it easier to get going.
>> Does this seem like a reasonable board to get?
>> John S.
>> On 7/11/2016 8:49 AM, Mark Sims wrote:
>>> One thing to consider about using a module with a built-in ceramic patch antenna is that usually the antenna cannot be removed and the modules have no support for an external antenna. If you do have problems getting a signal it can be very difficult to add an external antenna. You might want to try moving one around the house and seeing how well it works. It usually takes an indoor GPS a while to acquire lock to the GPS satellites.
>>> If you want a time-nutty-ish GPS receiver, search Ebay for "Ublox LEA6T". There are some units available from China that have one (plus a ceramic antenna) in them for a decent price ($30). Normally an LEA-6T GPS receiver is over $100... But to get the full benefit of a GPS timing receiver requires quite a bit of configuration and setup.
>>> Another receiver worth looking into is one from the Ublox 8 series. They can track and work with GPS, Glonass, Beidou, and other nav systems. Mine is currently tracking 25 satellites (GPS/GLONASS/SBAS) with an indoor antenna. It cost around $25 and came with a removable antenna. It has two programmable PPS outputs (only one is brought out to the connector)... you can set one to 10 KHz.
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