Horizontal radials

[Pman62]

I want to build a 1/4 wave ground plane antenna, but after considering my mounting space, I really need horizontal radials. Many years ago, I had a Radio Shack 1/4 wave antenna with horizontal radials and it worked great. Are there any formulas for making the stub match (like the Radio Shack antenna) to correct the impedance of horizontal radials? Also, I read somewhere (can't remember) that by increasing the length of the vertical and shortening the length of the radials the impedance can be corrected as well. Anyone know of any formulas to get me in the ball park for doing this? Basically, all I have is a SWR meter and a DMM for test equipment since I've been out of the hobby for MANY years; So many years in fact, I'm going to have to retake the test for my ham license.

 

[BJ radionut]

http://www.worldwidedx.com/threads/horizontal-vs-sloped-ground-elements-on-a-vertical.222695/

This thread is running now...it may answer your questions
Welcome
All the Best
Gary

Another alternate method of using a 102" whip
http://www.qsl.net/wd4nka/TEXTS/stinger.html

 

[The DB]

Also, I read somewhere (can't remember) that by increasing the length of the vertical and shortening the length of the radials the impedance can be corrected as well. Anyone know of any formulas to get me in the ball park for doing this?

This is true, however I don't have any formulas for you. The problem is impedance doesn't change steadily as you make the antenna longer and the radials shorter. I'm sure their is a formula that would get you close, but I don't know what it would be.

If I get a chance later I will make some models for you to find the point you are talking about.


The DB

 

[sp5it]

Also, I read somewhere (can't remember) that by increasing the length of the vertical and shortening the length of the radials the impedance can be corrected as well.

I modelled that for you in mmana. 42.6 + j0.27 SWR 1.17
Radiator 3.34m and 2 radials 1.97m each. Feedpoint 20m over the ground.
Mike

 

[Pman62]

Thanks for the info