A dipole at 50 feet high has a radiation angle of 19 degrees, only
slightly higher than the yagi in your example.
John KK9A
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Yagi gain vs rotary dipole.
From: "Joe Subich, W4TV" <lists@subich.com>
Date: Tue, 25 Nov 2014 17:44:31 -0500
## Ok, what are u saying here. Lets say a 20m dipole and a 3-el 20m
yagi.... both at 70 feet.At really low angles..say 0-10 deg.....
will the 3-el yagi have even more than 5.2 db of gain ?? Or put
another way... even though 70 feet = aprx 15 deg take off angle of
main lobe.... does the yagi exhibit more gain vs the dipole at angles
below 15 deg ?
A little work with EZNEC provides some answers ...
Using the model of a five element 20 meter yagi at 50 feet and a dipole
at 50 feet above *real* average ground ...
The dipole has a peak gain of 8.0 dBi at 21 degrees.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|