[MRCA] NVIS antenna for Gilbert

[Donald Sanders]

I should think that the MS116,117,118 with base unit and 3 or 4  ground
radials should work well in that application. I use that with the BC458 and
BC459 with good ground wave service.

Healthfully yours,
                          Don W4BWS
----- Original Message ----- 
From: "Robert Flory" <robandpj at earthlink.net>
To: "Military Radio Collectors Association" <mrca at mailman.qth.net>
Sent: Monday, September 18, 2006 6:28 AM
Subject: RE: [MRCA] NVIS antenna for Gilbert


> Gene wrote:
>
>  One other thing:  As I wrote last year, we might have trouble with
> > skywave/NVIS propagation on 80M during mid-afternoon on Friday and
> > mid-morning on Saturday.  D-layer absorption will be a bear at those
> times.
> > What we really need for 80M is a good ground-wave launching antenna for
> > 3.885.  Maybe a full-wave, terminated delta loop pointed at the
> mountaintop
> > field site.  But that's for next year.
>
> It is only 12 miles to the mountain.  I had no trouble working the
mountain
> with 3 watts and a 24-foot vertical.  NVIS propagation mode not necessary
> at that distance.
>
> Rob Flory
> robandpj at earthlink.net
> www.home.earthlink.net/~navyradio  WWII Navy Radio
> www.home.earthlink.net/~robandpj    Les Flory Television and Electronics
>
>
> > [Original Message]
> > From: <ersmar at comcast.net>
> > To: <mrca at mailman.qth.net>
> > Date: 9/17/2006 8:06:57 PM
> > Subject: [MRCA] NVIS antenna for Gilbert
> >
> > Gents:
> >
> >      I tried out the 80M wires of my NVIS inverted V system this
> afternoon.
> > I erected the thing in my ENTIRE front yard, spanning from one street
> corner
> > (I"m on a corner lot) to the fence around my back yard, across the front
> of
> > the house.  I used dacron guys for the other two legs.
> >
> >      After a bit of trimming, the final wire lengths were 59 feet each.
> SWR
> > BW (2:1) was about 90 kHz, centered on 3.850 MHz.  I had to use a couple
> of
> > additional fiberglass mast sections underneath the plastic chain that I
> use
> > as end insulators to raise the wire ends farther off the ground.  I
think
> > Dale or Rob suggested I do that anyway for RF safety.
> >
> >      At around 4-5 PM today from my Rockville, MD home (a bit north of
> DC) I
> > was able to work into PA (57) and throughout VA (59 - 59+10) with 80 W
> > output (my TS-570 was on battery power) on the high end of 80M.
> >
> >      I haven't tried the antenna with both 40 and 80M wire sets
installed
> > simultaneously; guess that will have to wait until Gilbert.  If we have
> to
> > save space, I can erect the mast as I did today - only the 80M wires.
> It'll
> > still be a long antenna system that we'll have to fit in somewhere.
> >
> >      One other thing:  As I wrote last year, we might have trouble with
> > skywave/NVIS propagation on 80M during mid-afternoon on Friday and
> > mid-morning on Saturday.  D-layer absorption will be a bear at those
> times.
> > What we really need for 80M is a good ground-wave launching antenna for
> > 3.885.  Maybe a full-wave, terminated delta loop pointed at the
> mountaintop
> > field site.  But that's for next year.
> >
> >
> > BCNU es 73 de
> > Gene Smar  AD3F
> > P.S  Anybody have the 4-pin MALE DC power connector for my AM-65 amp's
> power
> > cable?  The only place these things were found in gummit equpment was on
> the
> > M-300 mounting base for the AM-65/RT-70 combo.
> >
> >
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>
>
>
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