[TowerTalk] Reverse feed system...
Roger (K8RI) on TT
K8RI-on-TowerTalk at tm.net
Sat Apr 23 15:46:27 EDT 2016
The term, "Reverse Feed" confuses me a bit.
As Gene said, wire is "usually" cheap and can often be reused.
I no longer solder wire antenna connections, but use Brass or Copper,
Split Nuts. Unfortunately, in this area Copper wire may not be reusable
if it's been up for a month or more. It gets a rough, black oxide that
can make getting good connections with the split nuts difficult and
impossible to solder. The best bet for when that happens is to dip a
couple inches of the wire end into Muriatic acid to get a clean copper.
Of course the wire then needs to be washed thoroughly to remove all
traces of the acid.
NOTE: When using strong acids, use the appropriate safety gear. A
partial list: Face shields, safety goggles, rubber gloves, and a good
size bottle of Sodium Bicarbonate dissolved in water to neutralize any
spills or drops on clothing or skin. Acid is dangerous!
I normally use hard drawn, stranded antenna wire as my center fed
slopers are under enough tension that soft drawn wire (Romex) will
stretch considerably.
73
Roger (K8RI)
On 4/23/2016 Saturday 2:37 PM, Gene Smar wrote:
> Doug:
>
> Wire-based antennas like the one you're proposing (and like the ones I
> have off my tower) are cheap. Build it and try it. You can always reuse
> the wire from the radials.
>
> As another suggestion, try radials of two different lengths to give you
> two points of low SWR within the broad 75/80M band.
>
>
> 73 de
> Gene Smar AD3F
>
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
> Douglas Ruz / CO8DM
> Sent: Friday, April 22, 2016 10:04 PM
> To: topband at contesting.com
> Cc: 'reflector Towertalk' <towertalk at contesting.com>
> Subject: [TowerTalk] Reverse feed system...
>
> Hi,
>
>
>
> I would like try the Reverse Feed System (N4KG antenna) on 80m.
>
>
>
> I have a 50 ft GROUNDED tower (isolated from the guy wires) and similar size
> of Rohn 25G.How much top loading I need If radials (4) are connected at 15
> ft?...
>
>
>
> I have an spiderbeam on top but this antenna does not add any LOAD because
> all elements are isolated.Anyway, I have a 6m Yagi. 5 elem on a 15ft boom.
> The 6m yagi has all elem connected to the boom but the driven. I can install
> the 6m yagi on top of the tower about 4 ft below the spiderbeam.
>
>
>
> Maybe I need a larger 6m yagi to obtain enough loading ?
>
>
>
> Thoughts ?
>
>
>
> Doug, CO8DM
>
>
>
>
>
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--
73
Roger (K8RI)
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