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[TowerTalk] Inverted Vees

To: <towertalk@contesting.com>
Subject: [TowerTalk] Inverted Vees
From: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 15 Jun 2020 23:53:16 -0700
List-post: <mailto:towertalk@contesting.com>
Date: Mon, 15 Jun 2020 14:35:40 -0700
From: jimlux <jimlux@earthlink.net>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Inverted Vees

<for an idealized half wave dipole, the 10dB down point is at about 67 
<degrees off broadside.
<For a 1/4 wavelength (half length) dipole, it's at about 70.5 degrees, 
<and for an infinitesimal dipole it's at 71.5 degrees

<For 20 dB it's 82.7, 84, and 84.3.


<That is, if you are 23 degrees off the end, your "depth of null" is 
<10dB. To be 20 dB down, you've got to be about +/- 7 degrees.

<The null is sharper for the smaller antenna, which seems somewhat 
<counter intuitive.

##  What is the null depth  when its  exactly at  90 degs ??  IE:  directly off 
the ends of the  dipole.  

Jim  VE7RF

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