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Re: LF: LF Coils

To: [email protected]
Subject: Re: LF: LF Coils
From: Gerhard Hickl <[email protected]>
Date: Fri, 12 Nov 2010 23:24:11 +0100
In-reply-to: <000f01cb82b7$3175c960$0301a8c0@your91hoehfy9g>
References: <AA90A95A810E41C0B6A5D751FABA2772@lindavideo> <1289596636.2682.17.camel@gerhard-desktop> <000f01cb82b7$3175c960$0301a8c0@your91hoehfy9g>
Reply-to: [email protected]
Sender: [email protected]
Hi Mal!

As far as I understood it is regarding 137 (= LF)  but meanwhile I'm not
sure either....

73 es looking forward to a QSO on LF!

OE3GHB
Gerhard




Am Freitag, den 12.11.2010, 22:16 +0000 schrieb mal hamilton:
> What frequency are you discussing ?
> g3kev
> 
> ----- Original Message ----- 
> From: "Gerhard Hickl" <[email protected]>
> To: <[email protected]>
> Sent: Friday, November 12, 2010 9:17 PM
> Subject: Re: LF: LF Coils
> 
> 
> > Hi Ken!
> > 
> > It all depends on the antenna your are going to feed with this loading
> > coil. My system has a capacitive load of abt. 600pf and so the coil is
> > abt. 2,3mH. This is realized on a flower pot with about 40cm diameter,
> > 80 turns of insulated wire. The height of the pot is only 30cm.
> > 
> > If you have a smaller capacitive load, you'll need more inductance and
> > thus increasing the diameter of the coil-body.
> > 
> > If you count 6pf per meter for every vertical part of your antenna and
> > 5pf/m for every horizontal part, you can estimate the capacitive load
> > very well. For calculation of L and C for a given frequency or for
> > dimensioning air-coils (Luftspulen), I can recommend the
> > "Mini-Ringkernrechner"...
> > 
> > http://www.dl5swb.de/html/mini_ringkern-rechner.htm
> > 
> > I don't remember if there's an option for the language on installation
> > but even if it's only in German, it easy to operate.
> > 
> > 73
> > 
> > OE3GHB
> > Gerhard
> > 
> > 
> > 
> > 
> > 
> > Am Donnerstag, den 11.11.2010, 20:28 +0000 schrieb Ken:
> > > Hello Everyone.
> > > I went into  a branch of Wilkinsons (Watford), today, and saw some
> > > straight sided cylindrical dust bins about 0.5m diameter, useful for
> > > large coils?
> > >  
> > > 73
> > > Ken
> > > M0KHW   IO91TV
> > 
> > 
> > 
> 




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