Hi, I know you recommend a Pi 4/5 but I tried this out on a Pi Zero W and did manage to get stratum 1 with it, which is cool. However, I noticed something interesting which is that when checking the sources, PPS will always have exactly +/-1000ns of latency. Is this a hardware limitation you think? Just a curiosity and not a real issue. Feel free to close whenever.
210 Number of sources = 10
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#x NMEA 0 4 377 11 -70ms[ -70ms] +/- 397us
#* PPS 0 4 377 9 -32ns[ -36ns] +/- 1000ns
^- 192.168.1.1 3 5 377 16 -25ms[ -25ms] +/- 40ms
^- 65.73.197.211 3 6 277 48 -9501us[-9501us] +/- 80ms
^- 152.70.159.102 2 6 337 48 -11ms[ -11ms] +/- 112ms
^- 104.167.241.197 2 6 377 49 +5777us[+5777us] +/- 26ms
^- 135.148.100.14 2 6 377 49 -4120us[-4120us] +/- 41ms
^- 168.61.215.74 3 6 377 54 -24ms[ -24ms] +/- 92ms
^- 17.253.20.125 1 6 337 56 +57ms[ +57ms] +/- 74ms
^- 132.163.96.1 1 6 277 50 +9676us[+9677us] +/- 38ms
chronyc> tracking
Reference ID : 50505300 (PPS)
Stratum : 1
Ref time (UTC) : Sat Jan 13 02:44:03 2024
System time : 0.000000122 seconds slow of NTP time
Last offset : -0.000000128 seconds
RMS offset : 0.001089404 seconds
Frequency : 6.724 ppm fast
Residual freq : +0.000 ppm
Skew : 0.023 ppm
Root delay : 0.000000001 seconds
Root dispersion : 0.000013824 seconds
Update interval : 16.0 seconds
Leap status : Normal
Hi, I know you recommend a Pi 4/5 but I tried this out on a Pi Zero W and did manage to get stratum 1 with it, which is cool. However, I noticed something interesting which is that when checking the sources, PPS will always have exactly +/-1000ns of latency. Is this a hardware limitation you think? Just a curiosity and not a real issue. Feel free to close whenever.