[MRCA] NVIS antenna for Gilbert

[ersmar at comcast.net]

Rob:

     I just recall having a heck of a time hearing anybody on 3885 from back at base whle I was up on the mountain last year.  I'm anxious to see (hear?) how things go this year.  


Al:

     Will you be bringing your AS-2259 with the base?  If so, I'll have my MFJ tuner with long-wire output and a ground lug (and a dummy load).  You could put that in line between  your GRC-9 and the antenna to see if some sort of matching circuit is needed for better performance.  

73 de
Gene Smar  AD3F


 -------------- Original message ----------------------
From: "Robert Flory" <robandpj at earthlink.net>
>  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.
> >
> >
> > _______________________________________________
> > MRCA mailing list
> > MRCA at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/mrca
> 
> 
> 
> _______________________________________________
> MRCA mailing list
> MRCA at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/mrca