but if it was done with a ground rod that's not really much of a ground
for rf.
It isn't there to provide a ground. It is there to intercept return
rf, which flows not far below the surface. So a ground spike is a more
appropriate term. Ground rods are good for safety purposes.
Yes, I am
Subject: Topband: Signal attenuation from foliage near 160m antenna
This subject has been discussed here plenty of times in the past, and the
consensus has always been that trees and other foliage near a 160m antenna
has a negligible effect on the transmitted signal. That's what I have
I distinctly remembered' how well a 300-foot high
dipole I had worked,
Very evocative quotation marks. Reminds me that the area of the
brain that deals with memory also deals with creativity (imagination),
and that one definition of imagination is remembering something that
didn't happen.
I think this thread has gone to the limit, because the argument is
between
emotional conviction laced with constant personal insults and science.
Too bad the thread was marred by the insults and implications.
There was lots to be learned even from the digressions, once one had
figured out
I did speak to Lee at Hi-Z yesterday and he warned me about
substandard
quality F double females. He has had terrible problems with them.
In what respect are they sub-standard? What kind of problems?
There is so little that could be defective if the center conductor of
the coax is the right
Next year Im planning to try a couple of Slinky Beverages again in
order to get a 2-3 wave electrical equivalent for particular paths
and narrow the beamwidth to get rid of EU noise.
Carl
KM1H
Come on Carl! You're just being provocative. Someone may take that
seriously. You know very well
Thank you Mike. I did not know of the velocity factor parameters when
I made my practical experiments many years ago, and gave up when I ran
into anti-phasing and excessive broadening of the lobe. I see now
from Tom's paper that if one knows just what one is doing, a Slinky
could be useful.
Tom:
MOST antennas are in a neither world of being neither perfectly
balanced nor perfectly unbalanced.
How about an inverted L longer than 1/4 wave but optimized with series
capacitor? Any closer to perfect unbalanced?
Bob VE7BS
___
Topband
Anyone guess what would happen if the radials going over
the wall were coax shielded ?
That's a VERY interesting thought. Somebody model it please.
Bob VE7BS
___
UR RST IS ... ... ..9 QSB QSB - hw? BK
Hi Jim
Many years ago at 4U1ITU I found the Bird 43 grossly underestimated
the power output on 160, rather embarrassing at the temple of
regulation.
Bob VE7BS
The 250H range is 2 to 30 mhz 160M is not quite covered but I think
is ok.
___
UR RST IS
Hi Herb, Niko:
could be that it is too long for 40. This is just a
gut reaction as I have not come up with any reason.
Of course it is too long. Beverage said that when it is too long
there are so many lobes (and therefore nulls) that it is 50-50 that a
given direction will not be covered;
Bill
and now it's over till next year?
I don't know how it is in W4 and/or W2, but here in 7-land the
season is not over, although if people think it is it often appears
to be. For trans-Pacific paths the prop is better from May to
September, especially for northern and western VK.
73
Bob
Hi Barry
But it's taking up a lot of band width for no apparent reason.
in my own humble opinion, any further discussion is a waste of
cyberspace.
I, for one, have not found it boring. I don't believe we now know all
there is to know, and text does not take much file space. Some just
Hi Jim
Twenty years or so ago NM7M wrote a program in DOS that predicted the
position of the tilt in the E layer on the dark side of the
terminator, more than usual refraction at that point causing a
steeply downward signal as it exits the layer. Believing this, I made
sure I had some
I dont understand the sudden urge or desire of some to suppress all
high angle radiation from an inverted L. It is well established that
even a low horizontal
dipole can work amazing amounts of DX on 160 when conditions allow
and
having both possibilities present in the L is a benefit.
Carl
1. It could be a convenient accident.
2. If on purpose, the answer is probably Just in case this is
useful. But then you would expect DXE to draw attention to it .
3. Useful that this has been discovered and brought to our
attention.
Bob VE7BS
So other than phasing two Beverages, has anyone
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