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Message-ID: <01BEBEE4.AFEFC5A0@pc033hk.hk.cro.cz>
From: "OK1FIG" <petr.maly@hk.cro.cz>
To: rsgb_lf_group@blacksheep.org
Subject: LF: RE: Re: RE: coil wind prob, evolution-1
Date: Fri, 25 Jun 1999 08:28:21 +-200
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Reply-To: rsgb_lf_group@blacksheep.org
Sender: <majordom@post.thorcom.com>

Yes, of course. I wound these coils for first experiments and mainly for RX.
Few other aspects of behaviour comply to Gamal's theory.
1.
When I added layers to get to resonance I had to add much more layers than
I expected. The reason is simple. With adding layers the capacity raised
which demanded another inductancy to be added and so on...
2.
The coils have strange behaviour as if they were not in series. Changing the
tap on the tapped coil should result in different angle of inner coil of the vario to
get tuned again. But they seem to have their separate maxima not to correlated
with each other too much. It correspondens to Gamal suggestion of taking it 
for coupled band-pass filter.

I do not believe that the coil should be necessarily single layered. I will try to
follow Gamal's suggestion for spacing wires and layers with the same distance
as the diameter of wire is. I hope the coils will have much less layers and the 
strange behavior will disapper.

Not yet QRV but most probably I will listen to normal CW this weekend at the
cottage. I will take special care of first minutes of each hour again. Some further 
improvement of ant is prepared. I would like to hear also stations from U.K.!

73 Petr OK1FIG

----------
Od:	Dick Rollema[SMTP:d.w.rollema@gironet.nl]
Odesláno: 	24. cervna 1999 16:33
Komu:	rsgb_lf_group@blacksheep.org
Predmet: 	LF: Re: RE: coil wind prob, evolution-1

Petr,

You wrote:

There are about 7 layers.


This is wrong. Loading coils should be wound in a single layer to keep the
capacitance of the coil small.

73, Dick, PA0SE