Hello Jay!
Sorry for my late reply....
My former is the rest of a 400l barrel made out of an unknown plastics.
Once it was filled with activated coal and used for filtering air
contaminated by fuel-vapour. When I got it, it was empty and the coal
was removed.
I sawed off the bottom and the top. Still it is heavy but stiff.
The outer diameter is 725mm, thickness of the material is about 10mm.
73
OE3GHB
Gerhard
Am Sonntag, den 20.03.2011, 18:21 -0400 schrieb [email protected]:
> Gerhard
>
> Nice looking coil. What are you using for a form?
>
> Jay W1VD WD2XNS WE2XGR/2
>
>
> ----- Original Message -----
> From: "Gerhard Hickl" <[email protected]>
> To: <[email protected]>
> Sent: Sunday, March 20, 2011 3:14 PM
> Subject: Re: LF: VLF
>
>
> > Hello Mal, group!
> >
> > As far as I know, Markus and Ossi both use multi layer coils. They are
> > very compact but with the known problems regarding insulation. I think
> > Markus meanwhile has also a single-layer "stack"-type...some flower pots
> > building a stack.
> >
> > My coil is a single layer type with variometer inside. Basically the
> > same design that Stefan has in use, just a bit bigger.
> >
> > It is calculated for about 100m vertical wire (=roughly 600pf, pretty
> > much the same as my fixed antenna has) and the inductance is about 450
> > to 575mH. DC-resistance is about 140R.
> >
> > I will have to make some taps for longer wires (kite) but I had no
> > chance to give it a try.
> >
> > See the two pictures enclosed.
> >
> > I was transmitting from about 00:00z today until now on 8969.98 with a
> > break of about 90 minutes in the early afternoon. I switched to full
> > power roughly at 10z. The power I used before was about 6db lower in
> > order to maintain safety while the equipment was unattended. This
> > produced a nice trace on Paul's receiver.
> >
> >
> > 73
> > OE3GHB
> > Gerhard
> >
> >
> >
> >
> >
> > Am Sonntag, den 20.03.2011, 16:17 +0000 schrieb mal hamilton:
> >> It looks like all VLF acty has ceased today. No indication about what
> >> is going on.
> >> Those using large coils to resonate kites and balloons, are these
> >> coils single layer or pile wound, multi layer etc
> >> A lot of turns would be needed for single layer and insulation
> >> breakdown could be a problem for pile/lump wound.
> >> de mal/g3kev
> >>
> >
> >
>
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