[Antennas] gain and directivity

Tue, 09 Jul 2002 06:58:31 -0500

Hi Ed,

I would suppose that the reported gain of the j-pole was referenced to an 
isotropic radiator (dBi).  This possibly could be accomplished by the 
directivity in the elevation plane (remember the dough-nut pattern).  In 
other words, uniform gain in azimuth at a specific elevation.  Would be 
interested in some of your replies.

73, Jim, wd4air4

>From: "Ed" <[email protected]>
>To: <[email protected]>
>Subject: [Antennas] gain and directivity
>Date: Tue, 9 Jul 2002 00:02:56 -0400
>
>OK, let's get another thread started. I recently got into a discussion over 
>the local 2 meter repeater. Some older hams and some brand new ones were 
>talking about j-poles and gain and directivity as well as directivity in 
>vertical base station antennas. The nearest I can figure is that no one 
>agrees. My take was that the j-pole supposedly exhibits about 2.5 to 3.0 
>gain and may be somewhat directional. I have personally experienced quite a 
>bit of directivity in my vertical antennas at home. They are , of course , 
>advertised as being omni directional. Apparently a lot of factors such as 
>nearby objects and grounding affect this. I know a lot of this stuff is 
>based on theoretical antennas in free space but it sure makes for good 
>repeater fodder to listen to. What's your all's take and opinions. Please 
>keep the flame throwers holstered as I just would like to hear the experts 
>comments.
>ED YEARY W4TEY
>325 CUMBERLAND DRIVE
>HARROGATE, TN. 37752-6942
>
>
>
>
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