[time-nuts] GPS Phase locked Local Oscillator experiment
nebula at telus.net
Thu Mar 8 03:07:34 EST 2007
I did an experiment to investigate receiver solution stability and thought
some of you might find the results interesting. It is amazing to see how
stable the atmosphere is. I used a Z3816A 10MHz output to feed the 10MHz
input of a 3325A which then generated a phase locked local oscillator
frequency (19.095750MHz) for a modified VP oncore with the latest firmware.
A scope monitored the Z3816A pps output, the 3325A output and the VP pps
output. The phase locked local oscillator signal had about 3ns of slow peak
to peak wander compared to the Z3816A pps output. The WinOncore12 sawtooth
screen capture of the VP is a more interesting 15 minute sample (a flat
line is rather boring). The 74 second periodic pulses are a software
artifact. The test setup was a little crude. I used a simple BNC tee and a
capacitor to split the antenna signal to feed the VP on my bench.
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