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Date: Wed, 06 May 2009 17:22:52 +0100
From: Richard Newstead <g3cwi@btconnect.com>
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Subject: Re: LF: Re: 500kHz Portable
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mal hamilton wrote:
> Richard
> Try a 12metre fiberglass telescopic pole to support an inv L using 
> wire size 1mm as long as possible. Use a matching network at the 
> bottom of the vertical part, coil in series to earth. Tap down coil 
> for resonance, tap coax up a few turns from earth end for best match, 
> lowest swr, braid of coax to earth. Use a couple of insulated radials 
> lying on ground and connected to coax earth. This method never fails 
> to work.
> There are other methods but the above is vy efficient, light and 
> portable.
>
Thanks for the tips Mal. Maybe I could fly a kite to support the wire 
off the top of the pole. How long would the radials need to be to have 
some benefit? I need to calculate the required inductance to resonate 
the system - what's the best software to use no DOS here so can't easily 
use Reg FGQ's progs.

I have been on 10GHz for the past year so 500kHz will make a nice change!

73

Richard
G3CWI