From: Gerhard Hickl <gerhard.hickl@aon.at>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <00cc01cbe734$fb3289a0$0401a8c0@xphd97xgq27nyf>
References: <008001cbe71a$472d7b00$0401a8c0@xphd97xgq27nyf>
	 <1300648453.2368.16.camel@gerhard-desktop>
	 <00cc01cbe734$fb3289a0$0401a8c0@xphd97xgq27nyf>
Date: Sun, 20 Mar 2011 20:51:59 +0100
Message-ID: <1300650719.2368.39.camel@gerhard-desktop>
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Subject: Re: LF: VLF
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Mal!

It's a 0.6mm enamel wire.

1mm diameter would work fine and of course reduce the losses
significantly. Just keep in mind, that the overall length of the coil
will increase with thicker wire. My coil has about 950 turns but if you
don't need so many, the 1mm would be fine.

2mm seems to be a bit of an overkill to me.

73
Gerhard


Am Sonntag, den 20.03.2011, 19:28 +0000 schrieb mal hamilton:
> 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
> > >
> >
> >
> 
>