What comes to mind is how true to reality is the model's results? If
the model is relatively true to reality then most of us would likely not
bother with additional radials.
You said, "It is working great." Is that a reasonable motivation to add
4 more radials to maybe get 0.01 more dBi? The term diminishing returns
comes to mind.
I would suggest leaving it alone and enjoy using it.
Have fun.
Patrick NJ5G
.
------ Original Message ------
From: "Dave Sublette" <k4to.dave@gmail.com>
To: "kj6y--- via TowerTalk" <towertalk@contesting.com>
Sent: 3/15/2021 10:26:00 AM
Subject: [TowerTalk] Vertical question
Good morning,
I recently changed my elevated 160 meter quarter wave vertical with 8 full
sized radials to having only 1/8th wave length radials and only four of
them. It is working great. So I thought adding four more radials might
improve things.
But before I went to all the trouble I decided to model it and see if there
was a difference in performance of the 8 radial version compared to the 4
radial system.
I use a modelling program called Antenna Model. The result of the
comparison is this:
The 4 radial system showed a gain of 0.92 dBi with the main lobe at an
elevation of 20 degrees.
The 8 radial system showed a gain of 0.93 dBi and an identical elevation
pattern.
My question is: Why is the gain figure so low? A dipole exhibits 2.14 dBi
gain. Why doesn't the vertical show gain?
And lastly, I think these results tell me it isn't worth the effort to add
four more radials.
Your thoughts?
Thanks & 73,
Dave, K4TO
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