[MRCA] NVIS on 40M - reprise

[Rev. Don Sanders]

A couple years ago there was a listing on
QRP-L  I believe showing a home brew
version of the AS-2259 NVIS-I lost the
URL in a disk crash but I have a printed
copy.  His model is non resonant and
requires a tuner. He references a web
site by WB5UDE with a lot of info on
the NVIS.
Healthfully yours,
                          DON W4BWS
----- Original Message ----- 
From: <ersmar at comcast.net>
To: <mrca at mailman.qth.net>
Sent: Sunday, March 12, 2006 5:31 PM
Subject: [MRCA] NVIS on 40M - reprise


> Gents:
>
>      I got to thinking a bit about that low resonant frequency that I
measured for my 40M inverted V yesterday.  Today I actually took out a
calculator and did the math: 468/70 feet = 6.69 MHz.  So in reality my
measured low SWR freq for the V was right on the money for 70 feet of wire.
(Something's gotta be wrong.)  So I'll proceed to prune some length (70
feet - (468/7.25 MHz = 64.5 feet)) or about 5.5 feet total off the wires
next time I erect it so the SWR will be lower in the SSB portion of the
band.
>
>      Also, today I added a foot of plastic chain (Home Despot again)
between the ends of the wires and the nylon guy rope (HD, irridescent red.)
As I expected, the rope, chain and wires wrapped up nicely and neatly on the
rope's original plastic spindle.  I have one half of the dipole/V on each
spindle.  (I got this idea from ebay.  Someone was selling a special forces
wire antenna kit from the Brits.  The kit clearly showed a plastic chain set
in line between the guy rope and antenna wire.  Pretty slick.)
>
>      BTW - I used #14 stranded insulated house wire (HD) for the dipole.
I'll experiment with this stuff, and even use it in the demo next week.
Then I'll rebuild the dipole with some superflex #536 from The Wireman.  I
believe it's not on his web pages, but he had some special made for another
customer and I bought 300 feet of it.  It's very soft but relatively heavy
gauge.  I believe it's #14, as well.
>
>
> 73 de
> Gene Smar  AD3F
>
> P.S.  I'm also awaiting delivery of my second RT-70/AM-65 set.  Hopefully
will have one of the two at Gilbert this year.
>
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