[time-nuts] TADD-1 six channel RF distribution amplifier
Tom Van Baak
tvb at LeapSecond.com
Fri Mar 28 19:51:59 UTC 2008
> The phase plots on tvb's web site
> http://www.leapsecond.com/pages/tadd-1/3phase2.gif show that the device's
> temperature was never stabilized. The closest to being stable is at the 29
> minute point on that plot.
>
> Particularly when the phase value goes up (not sure if it's when temperature
> goes up or down), because the phase was still changing at a pretty high rate
> when the compressor changed state. I think Tom should rerun that test with a
> much slower cycling, to make sure the phase was stable before the compressor
Agreed. Actually, I don't have that A/C anymore so future
tempco tests won't have that rapid cycling.
> was turned on (or off). Since the phase excursion was not complete, the
> 150pS/degree is probably underestimated.
>
> My guess is that the period should be at least doubled.
Yeah, I think so.
The main conclusion I had when I made those plots was that
the input filter was a bad idea, at least if the TADD was to be
used for precision work.
> Didier KO4BB
/tvb
More information about the Time-nuts_lists.febo.com
mailing list