[MRCA] NVIS antenna for Gilbert

[Robert Flory]

 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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