Re: LF: VLF

[<jrusgrove@comcast.net>]

Gerhard

Thanks for the info. Nice work!

Jay


----- Original Message ----- 
From: "Gerhard Hickl" <gerhard.hickl@aon.at>
To: <rsgb_lf_group@blacksheep.org>
Sent: Friday, March 25, 2011 6:59 PM
Subject: Re: LF: VLF


> 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 jrusgrove@comcast.net:
> > Gerhard
> >
> > Nice looking coil. What are you using for a form?
> >
> > Jay W1VD  WD2XNS  WE2XGR/2
> >
> >
> > ----- Original Message ----- 
> > From: "Gerhard Hickl" <gerhard.hickl@aon.at>
> > To: <rsgb_lf_group@blacksheep.org>
> > 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
> > >>  
> > > 
> > >