[time-nuts] u-blox "naked" chips - anyone brave enough to try them?
kb8tq at n1k.org
Wed Jun 15 07:03:28 EDT 2016
If you feed the chip with your local reference:
1) You need to synthesize a signal at the expected frequency (26 MHz, 48 MHz … whatever)
2) The signal needs to be low phase noise (per the chip set specs)
3) The signal needs to be constrained for ADEV (per the chip set specs)
All of that may or may not be as simple as measuring the phase.
> On Jun 15, 2016, at 5:11 AM, Attila Kinali <attila at kinali.ch> wrote:
> On Wed, 15 Jun 2016 09:44:15 +0200
> Mike Cook <michael.cook at sfr.fr> wrote:
>> Certainly cheap…. BUT
>> On the ublox site there is a table indicating that the KT is a standard precision engine. On the same table, the UBX-M8030-KT-FT is required for timing:
> Oops! Missed that one! Sorry!
> How about using an UBX-G6010  then? They are also available for <5USD/pcs.
> Apparently, it is possible to enable various commands with the 6th gen
> chips  and there is some RAW message enabled firmware available
>> So, they may be cheap, very cheap, but are they really what a TN would want?
> Maybe? :-)
> Given the amoount of people who use modules without even sawtooth correction
> and still get pretty good results, it might be promising. At the very least
> you could get around measuring the PPS directly and instead, just use the
> sawtooth correction message to know how far you've drifted
> Attila Kinali
>  http://innovictor.com/pdf/UBXG6010_UBXG600_UBXG0010_DataSheet_GPS%20G6-X-09004_Confidential.pdf
>  http://wiki.openstreetmap.org/wiki/UbloxRAW#U-BLOX6
>  http://gps.0xdc.ru/static/ublox/device/Navilock%20NL-602U/patched/NL602-patched-fw.bin
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