From: "Terrell W. Fritz"
Date: Tue, 30 Apr 2002 14:16:47 -0600
Subject: Re: [TSSP] qvar expt4
Hi Paul,
Expt6 is the coil with one of John's 4 by 13 torroids on it. I'll try to get a
picture. Expt 5 was sort of a bad try, so forget that ;-)
You will note that Q3 still tends to be a bit wild!! The Expt6 data is
otherwise quite pure and behaved. Warm sunny and clear weather today. I think
the "technical" side of the experiment is real good now so the data should be
very nice!!
http://hot-streamer.com/bob/qvar/results/expt6/index.html
The local temperature probe was a very nice addition. I bet humididtiy would
be too if I could figure out how to add it...
Cheers,
Terry
At 08:24 PM 4/30/2002 +0100, you wrote:
>Terry wrote:
>
>> The Q1 dip should be real. There is an instant local temperature
>> dip that is probably the computer crashing (there is no file so
>> it read as zero) but Q1 and the pinger data should be fine.
>> I would guess we had a little spot rain around that time.
>
>Ah good. It's real clear that the big q1 dips are associated
>with rain and dew, although the mechanism remains to be
>figured out.
>
>But I'm well and truly puzzled by the behaviour of q3. For the
>others, q3 is the Q factor of the 3/4 wave overtone of the coil.
>It has a curious habit of droping by some 2% to 4% for a period
>of 20-30 mins. The other two Q factors, 1/4 wave and 5/4 wave,
>remain undisturbed. This has been observed now on two different
>but similar coils in the same location. Apart from these funny
>q3 blips and the rain/dew events, the q factors smoothly follow
>the temperature curves. Beats me what in the environment can be
>coupling to the coil's 3/4 wave like that. Happens a couple of
>times a day, roughly. No disturbance to the frequency. Most odd.
>Ideas welcome!
>
>> I am thinking of adding a top terminal next.
>
>I see we've moved on to expt6 now, which looks suspiciously like
>a toroided coil. I'll be looking out for those q3 dips.
>--
>Paul Nicholson,
>--
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.