[TowerTalk] Vertical question

[Patrick Greenlee]

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 at gmail.com>
To: "kj6y--- via TowerTalk" <towertalk at 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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