Dear all
I'm not really sure if this is the right place for my question, but maybe
somebody may help me:
I'm running Debian with gpsd and ntpd on an older ALIX board as the time source
for my local network. This setup is working well for quite some time and the
clock is kept to within a few microseconds of the 1PPS reference.
But if the time is compared to some reliable public stratum 1 servers (e.g.
metas.ch), it seems that the local clock is always a few milliseconds behind
these servers. I'd like to do some more precise measurement to figure out the
latency of the 1PPS signal processing and to adjust the fudge time. According
to what I've read, the delay can be measured using an oscilloscope and the PPS
echo feature. But I couldn't figure out how the echo function can be activated.
Can anyone provide some guidance on how to enable the PPS echo function? Or
maybe there's another way to do some measurements? Many thanks for your help.
Regards
Reto