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Test seems to be OK. afreq is the frequency times 100 that is set to create the 10MHz GPS locked output.
Stable enough to go to a 400 seconds period using a 1e+9 pulse count Delta's for the last 5 400 seconds periods where 2,1,-4,3,-1 pulses? The largest correction using the 4 pulse delta was 4e-9 or 0.04Hz on the 10MHz output. A bit on the high side but still well within 1e-8 Will let it run a bit longer to judge stability. For now there does not seem to be a substantial drift, just noise in the measured frequency. Keep in mind this GPSDO jumps to a new frequency instead of slowly changing. For accurate measurements it may be wise to have a switch to temporarily disable updates avoiding a (small) jump in the middle of a measurement Log: 0:0:4 Z dur=1 meas=2499996 targ=2500000 dif=-1600 calf=2287 tfreq=1000002287 afreq=1000002287?
0:0:6 Z dur=1 meas=2500001 targ=2500000 dif=400 calf=1887 tfreq=1000001887 afreq=1000001887 Lock
0:0:9 Z dur=2 meas=5000004 targ=5000000 dif=800 calf=1087 tfreq=1000001087 afreq=1000001087?
0:0:12 Z dur=2 meas=5000000 targ=5000000 dif=0 calf=1087 tfreq=1000001087 afreq=1000001087 Lock
0:0:17 Z dur=4 meas=10000002 targ=10000000 dif=200 calf=887 tfreq=1000000887 afreq=1000000887 Lock
0:0:26 Z dur=8 meas=20000003 targ=20000000 dif=150 calf=737 tfreq=1000000737 afreq=1000000737 Lock
0:0:43 Z dur=16 meas=40000004 targ=40000000 dif=100 calf=637 tfreq=1000000637 afreq=1000000637?
0:1:0 Z dur=16 meas=40000000 targ=40000000 dif=0 calf=637 tfreq=1000000637 afreq=1000000637 Lock
0:1:33 Z dur=32 meas=80000002 targ=80000000 dif=25 calf=612 tfreq=1000000612 afreq=1000000612 Lock
0:2:38 Z dur=64 meas=160000002 targ=160000000 dif=12 calf=600 tfreq=1000000600 afreq=1000000600 Lock
0:4:47 Z dur=128 meas=320000000 targ=320000000 dif=0 calf=600 tfreq=1000000600 afreq=1000000600 Lock
0:9:4 Z dur=256 meas=640000005 targ=640000000 dif=7 calf=593 tfreq=1000000593 afreq=1000000593?
0:13:21 Z dur=256 meas=640000000 targ=640000000 dif=0 calf=593 tfreq=1000000593 afreq=1000000593 Lock
0:20:2 Z dur=400 meas=1000000002 targ=1000000000 dif=2 calf=591 tfreq=1000000591 afreq=1000000591 Lock
0:26:43 Z dur=400 meas=1000000001 targ=1000000000 dif=1 calf=590 tfreq=1000000590 afreq=1000000590 Lock
0:33:24 Z dur=400 meas=999999996 targ=1000000000 dif=-4 calf=594 tfreq=1000000594 afreq=1000000594
0:40:5 Z dur=400 meas=1000000003 targ=1000000000 dif=3 calf=591 tfreq=1000000591 afreq=1000000591 Lock
?0:46:46 Z dur=400 meas=999999999 targ=1000000000 dif=-1 calf=592 tfreq=1000000592 afreq=1000000592 Lock
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-- HBTE Files section:?/g/HBTE/files Erik, PD0EK |
