[TowerTalk] Vertical question

[weaverwf at usermail.com]

Dave,
Have you looked into WSPR for a real world study on the vertical? 

http://www.wsprnet.org/drupal/

I use the WSJT software for it’s WSPR mode: https://www.physics.princeton.edu/pulsar/k1jt/wsjtx.html

73,
Bill WE5P
Comfortably Numb

> On Mar 15, 2021, at 11:27, Dave Sublette <k4to.dave at gmail.com> wrote:
> 
> 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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