TSSP: List Archives

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.