Hi, Joe
Sounds like things are3 progressing nicely! I also live on a small lot and I
worked DX all over the world with and inverted L that only had two elevated
resonant radials at 90 degrees to each other.
Couple comments regarding you VSWR observations;
1.0 A perfectly tuned resonant inver
Tom, I stopped using models years ago ! Even though my 160 antenna is probably
less that 30% efficient it's amazing what I've worked with it so far. Granted
the receive end is doing all of the heavy lifting. For me the fun of 160 is all
about overcoming the challenges presented to me on a very s
Hi Joe,
Unfortunately all of that stuff renders any model or bandwidth prediction
pretty much meaningless. Two antennas 40 feet apart on 160 are about like
having two antennas 4 feet apart on 15 meters.
We just have to do the best we can with the space we have, although the 40
ft long groun
Tom there are many other things in the mix here. Five houses within 30-40 feet,
Hi-Z receive antenna within 10 feet of transmit antennas, three other wire
antennas sharing the same trees and air space. And yes the old L is still there
at about 60 feet away. I don’t think I'm the only person in t
I now notice much better receive and transmit performance than before.
Before I added the radials the old L was louder in certain directions.
That's not the case any more. The new L is louder now regardless of
direction. So I'm heading in the right direction. I was able to work 3 new
DX entit
Update --
I've added 13 radials to my new L over last weekend. Ranging from 30 to 65
feet. Also connected radials to old radial field. New radials run over top of
old the ones. Due to antenna placement and neighbors I can only run radials 90
degrees from the antenna base. Cant run radials 360
The somewhat devastating report from NEC 4.2 offered by Mr Fry is all the
more gloomy if one factors in the now-common acknowledgement that NEC 4.x
underestimates ground losses with less than ideal radial configurations. Or
stated another way, the gloomy NEC 4.2 report is the very best the bad
situ
Yuri,
Here is a link to a graphic showing a 3D view of the wire model, and
the envelope of the total radiated fields.
http://s20.postimg.org/6g3f49oml/L_with_Offset_Gnd.png
R. Fry
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Topband Reflector Archives - http://www.contesting.com/_topband
Hi Richard,
How does the radiation diagram, pattern look with offset radials?
I would suspect some enhancement in the direction of the old radial
field. (RF mirror)
Do the numbers apply to overall average over 360 deg or is there
variation in different directions.
Yuri, K3BU.us
On Mon
Joe N3HEE wrote:
I moved my 160 inverted L to a tall tree in my backyard to get more
vertical
height. The vertical leg is now about 65 feet and the rest (65feet) is
horizontal. Any feedback would be great. Thanks -Joe N3HEE
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A NEC4.2 model roughly approximating this system was
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