[time-nuts] 5061A Problem Child
J. L. Trantham
jltran at att.net
Wed Jun 16 02:33:27 UTC 2010
It's been a long week and it's only Tuesday.
How can I prove that the A3 assembly is, in fact, phase modulating? In
other words, how can I prove that the 90 MHz signal from the A3 assembly to
J1 on the A4 assembly is phase modulated by the 137 Hz signal?
I have looked at the output of the A3 assembly at the cable to J1 on the A4
assembly (A4P1) with an oscilloscope and a spectrum analyzer with Mod On and
Mod Off and can see no difference. Likewise, on a functioning unit, I can
not see any difference there either. Are there proper ways to set up the
scope or SA to focus on this issue?
Short of fabricating a 'phase detector', how can I prove that the A3 unit is
functioning in my 'problem child' unit. If I have to fabricate a 'phase
detector', how easy (or difficult) is that?
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