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
Vic - I often operate QRP field operations from such a location at Gallisteo
Dam. It has a long steeply sloping ground to the East and Northeast. I use
an inverted vee for 40 M and 20 M at 24 feet in a painters pole.
Propagation is great and I do pretty well in the QRP field contests. It is
worth
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 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.
In the Moxon antenna book (chapter 10), he says that a simple dipole or
inverted vee at a low height in such a location can show
-807-0575 (fax)
908-451-6801 (cell)
800-209-7438 (pager)
[EMAIL PROTECTED]
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Vic K2VCO
Sent: Tuesday, August 09, 2005 2:14 PM
To: Elecraft Reflector
Subject: [Elecraft] Low antennas in high places
I would like
it, I'll send you the URL.
Eric
KE6US
www.ke6us.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Vic K2VCO
Sent: Tuesday, August 09, 2005 11:14 AM
To: Elecraft Reflector
Subject: [Elecraft] Low antennas in high places
I would like to correspond
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
K2VCO wrote:
such a location can show excellent gain at low angles.
See the HFTA TOA analysis of
such a location below:
http://users.vnet.net/btippett/w3cra.htm
W3CRA (pre-war W8CRA) had legendary
propagation. The TOA analysis shows
why. The blue line shows 12-15 dB at
low angles
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