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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 22:35:03 +0000 (GMT) |
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Graham and extra pole is not unreasonable or by adding a smaller diam. light weight pole 20ft on top. Check it out another 'S' point (or thereabouts) for free? Paint it mottled blue and the neighbours wouldn't even notice. You know it makes sense. GL. 73 es GL Pete M0FMT IO91UX On Tuesday, 3 December 2013, 21:39, Graham <[email protected]> wrote: Err NCD on that one Pete , the last
'refurbishment' of the pole , attracted evil spirits
...so at 2x 20 2 inch alloy scaffold poles , that's
as good as it get's !
73-G,
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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