Message-ID: <00cc01cbe734$fb3289a0$0401a8c0@xphd97xgq27nyf>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <008001cbe71a$472d7b00$0401a8c0@xphd97xgq27nyf> <1300648453.2368.16.camel@gerhard-desktop>
Date: Sun, 20 Mar 2011 19:28:24 -0000
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Subject: Re: LF: VLF
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Gerhard
That copper wire looks very fine guage. I have plenty of 1mm and 2mm
enamelled wire also 1mm pvc insulated that should be ok
tnx info
de mal/g3kev

----- Original Message -----
From: "Gerhard Hickl" <gerhard.hickl@aon.at>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, March 20, 2011 7:14 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
> >
>
>