Kevin,
Be careful when doing these comparisons. A 1/4 wave over a ground
plane unless it has a really good radial system may not be as efficient
than your inverted L. What I would normally suggest is an A/B test using
signal strength at the receiving station, but that has it flaws also,
what's the pattern.
73,
Barry
K3NDM
On 8/25/2020 8:21 PM, kevinr wrote:
I am hearing quite a difference between my inverted V and my 1/4 wave
over a ground plane. For the last few weeks I've been hearing less
noise on the vertical. Enough less to pull more ops out of the
noise. When I try the inverted L I expect there to be a little more
noise than the vertical, but less than the doublet. Now to test that
hypothesis.
Kevin. KD5ONS
On 8/25/20 5:04 PM, David Gilbert wrote:
Pretty sure there are some significant pattern differences between
ANY horizontal antenna and a vertical one on 160m ... at least at
heights practical for amateur radio purposes.
That's probably why.
Dave AB7E
On 8/25/2020 4:49 PM, Lyn Norstad wrote:
Good gracious. Why does everyone overthink 160m? OK, maybe just
because it's fun. I get that.
But as to operation, I have one (1) antenna, and it is a 360 foot
EDZ (dipole) cut for 3.5 MHz. It's great on all bands, 160 - 6m.
No radials needed.
Specifically I worked 47 of the 50 states in one 24 hour period on
160m (holdouts were AK, HI and NV - all picked up within a day or two).
I could 'splain more, if anyone is interested.
73
Lyn, W0LEN
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of kevinr
Sent: Tuesday, August 25, 2020 6:24 PM
To: Elecraft Reflector
Subject: [Elecraft] Inverted L for 160 meters
From what I can find, and what I can calculate, five wires, each ~130
feet long, could make a nice inverted L for 160 meters. One leg for
the
vertical and horizontal portion of the antenna. Four legs for the
counterpoise (ground plane). There are many broken wire antennas
stored
in my shed which are fodder for the radials. Do all of the legs for the
counterpoise need to be 1/4 wavelength or can I substitute some shorter
lengths? The feedpoint should somewhere above 50 ohms impedance. As I
add more radials that number will reach 50 ohms asymptotically.
I can get the vertical part up to 70 or 80 feet above ground with the
rest of it horizontal. Most of the radiation should take place from
the
vertical part since it is closer to the feed point. But there
should be
some effect from the direction of the horizontal portion. How strongly
does the direction of the horizontal portion effect the radiation
pattern of the antenna system? My property allows me to point it from
300 degrees around to 200 degrees so I have plenty of options. Between
200 and 300 degrees there is a road used by loggers, and the folks
maintaining the towers at the top of this mountain. They can break any
antenna lower than 80 feet above ground. Spar poles and cranes clear
out any dead limbs across the road.
Inquiring minds...
Kevin. KD5ONS
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