[time-nuts] NEO-7M various modes

jimlux jimlux at earthlink.net
Sat Oct 28 20:27:01 EDT 2017

On 10/28/17 3:24 PM, Wayne Holder wrote:
> uBlox has a utility called u-center
> <https://www.u-blox.com/en/product/u-center-windows> that's a free
> download.  You can use it to configure the various output options (and
> enable and disable different messages) and a then save this config back to
> the module as the start up default.
Downloaded it, hooked up the modules, found that they won't quite get a 
fix indoors next to the window, but if I take it outside, it will. 
Oddly, the SNR on the SVs is good enough, but there's something 
preventing the fix from happening.

Maybe it's because it's a cold start, it needed to run for a while to 
acquire the almanac or something.

> Wayne
> On Sat, Oct 28, 2017 at 3:12 PM, jimlux <jimlux at earthlink.net> wrote:
>> I've got 4 NEO-7M-C modules hooked up to 7 beaglebone greens, side by
>> side, and they're not behaving the same..
>> I've got gpsd running, and I'm looking at the output of cgps and/or
>> gpsmon, as well as ppstest
>> Some emit NMEA sentences, others binary (ublox?) strings?
>> Some get a fix and start toggling the 1pps line, others don't.
>> Is there some command string one can send to them to put them into a known
>> state (cold reset?) - the one that's working the best (I.e. has a fix AND
>> toggles 1pps) seems to be putting out binary strings (when viewed with
>> gpsmon).
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