NMEA refclock

[dropkick23 at gmail.com]

Mode 1 is the directive to process RMC sentences and defaults to 9600 and
the GPS is sending RMC @ 9600 and ppstest does show correct output.  I have
a couple of other ntpd servers that are shm refclock.  Thank you for the
heads up on  pool directive.  FYI HW is RPi3+ and GPS is from uputronics.

Thanks
Fred


On Wed, Dec 2, 2020 at 5:31 PM James Browning via users <users at ntpsec.org>
wrote:

> On Wed, Dec 2, 2020, 4:12 PM Fred via users <users at ntpsec.org> wrote:
>
>> Trying to setup NMEA refclock.  I'm seeing the following error in
>> ntpd.log:
>> 2020-12-02T16:58:12 ntpd[705]: PROTO: NMEA(0) 804b 8b clock_event
>> clk_no_reply
>> 2020-12-02T16:58:13 ntpd[705]: PROTO: NMEA(0) 805b 8b clock_event
>> clk_bad_format
>> 2020-12-02T16:59:16 ntpd[705]: PROTO: NMEA(0) 806b 8b clock_event
>> clk_no_reply
>> 2020-12-02T16:59:17 ntpd[705]: PROTO: NMEA(0) 807b 8b clock_event
>> clk_bad_format
>>
>> ntpq -p does not change from:
>> NMEA(0)                                 .GPS.            0 l    -   64
>>  0   0.0000   0.0000   *1.9531*
>> + server pool
>>
>> *ntp.conf*
>> server 127.127.20.0 mode 1 prefer
>> fudge 127.127.20.0 flag1 1 flag2 0  refid GPS
>>
>> server 0.us.pool.ntp.org iburst
>> server 1.us.pool.ntp.org iburst
>> server 2.us.pool.ntp.org iburst
>> server 3.us.pool.ntp.org iburst
>>
>> + ntpstat lines
>>
>> Any insight would be helpful.
>>
>
> Without looking at all, I would guess that your GPS is not sending the
> NMEA0183 sentences ntpsec was expecting. My course of action would be to
> check the output of that GPS and look at the source to see what else could
> trigger those messages. Also IIRC gpsd is the preferred interface to GPS
> receivers and the pool directive should be used instead of the four server
> directives. Better answers might come later.
>
>> _______________________________________________
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> users at ntpsec.org
> http://lists.ntpsec.org/mailman/listinfo/users
>
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