Ron wrote:
The advantage of low dipoles on slopes for DX noted by Moxon
is that the earth behind the radiator acts as a reflector.
For an HF dipole installed along a stony cliff or bluff, I've always had my
doubts that the earth and stone behind the dipole act much like an effective
ground
the program on
NVIS antennas and he is writing an article for QST.
Paul Gates
K1 #0231
KX1 #1186
XG1
[EMAIL PROTECTED]
- Original Message -
From: Mike Morrow [EMAIL PROTECTED]
To: 'elecraft' elecraft@mailman.qth.net
Sent: Thursday, August 11, 2005 1:19 PM
Subject: RE: [Elecraft] Low antennas
No matter what the ground conductivity is at a given hill top located
antenna, what is shown in one ARRL Antenna Compendium piece on gains from an
antenna near the edge of, and atop a hill, is that you are no longer
shadowing say, a dipole parallel to the cliff face from radiating at angles
This past Field Day, we used some NVIS dipoles atop a hill in Austin TX.
There was a sharp drop to the east and to the West.
We not only worked obvious NVIS range signals; but worked a number of skip
signals from antennas no more than 7 feet high at the highest. The 40m
antenna was only 3 1/2
Paul,
NVIS (Near Vertical Incidence Skywave) dipoles or antennas are any antenna
operated at low elevations above ground from lying on ground to being say
0.1 wave high, and certainly well below conventional heights for that
antenna. They are horizontal dipoles usually a half wave type, or
Stuart wrote:
NVIS (Near Vertical Incidence Skywave) dipoles or antennas are any antenna
operated at low elevations above ground from lying on ground to being say
0.1 wave high, and certainly well below conventional heights for that
antenna.
---
The optimum height
I just used a portable inverted vee fed with 300 ohm ladder line and the
elecraft 4:1 balun during our camping trip up in the hills of northwest NJ.
The K2 heard like a hawk. I had it up about 30 feet and the ends were maybe
8-10 feet off the ground. 1st QSO I snagged Switzerland on 40 meters
Vic,
I have noticed the effect in the San Jacinto Mtns east of here. I was at
around 8000'. I layed out my end-fed wire as a sloper with the low end
pointing east on relatively flat terrain at the campground. I later moved it
so that it sloped from the edge of a drop off down to a scrubby tree on
Vic wrote:
I would like to correspond with anyone who has tried portable QRP
operation from a high location, using a low horizontal antenna at the
edge of a sharp dropoff.
I always got great results operating from a bluff on Arkansas' Mount Magazine
and similar locations, by running the ends
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