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| To: | "[email protected]" <[email protected]> |
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| Subject: | Re: LF: Re: Inv L 'FAN' top wires ? |
| From: | M0FMT <[email protected]> |
| Date: | Tue, 3 Dec 2013 21:13:48 +0000 (GMT) |
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Hi Graham Probably better to put your efforts into making it higher ? 73 es GL Pete M0FMT IO91UX On Tuesday, 3 December 2013, 11:25, Alan Melia <[email protected]> wrote: Hi Graham, this will increase the aerial capacity
by around 100 to 120pF provided the new wires are not over/close to lossy
foliage/buildings, as the new wires are only the same length as the current
wires you will see little increase in Rrad, BUT you will see a proportional
decrease in the loss resistance. So the aerial becomes more efficient......this
assumes a flat fan not a sloping one.
There is also mileage to be had by connecting the
ends of the fan together!! see the measurements Finbar did on the Spiral top
loaded systems we tested. http://g3nyk.ham-radio-op.net/spiraltop.htm
Approximately, doubling the antenna capacitance
halves the Rloss which is the component determining the antenna current
you can drive and hence the ERP.
Alan
G3NYK
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