Quoting David Taylor :
I'm not an expert in this, but the timing seems to be the same in
both graphs, the problem occurring around 8000. Could that be due
to someone with a GPS jammer parking nearby?
To expand on this: what were your GPS satellite signal strengths like
during this time
Hello:
This email actually identifies two
problems:
1. The pictures show that the algorithm
stops working after a while.
2. The control algorithm is not precise
enough to control the frequency effectively
when PPS is the driver.
I put print statements in the refclock_sample
routine
I use a Garmin LVC 18x with a Raspberry Pi, process NMEA with gpsd
(SHM driver) and acess PPS by GPIO (kernel PPS driver). gpsd allows
monitoring and passing PPS right into ntpd avoids gpsd conversion of PPS.
Sometimes this works, but then there are times where both clocks are
thrown out as
