[Antennas] W3EDP antenna

2002年5月18日 21:26:29 -0400

At 01:59 PM 5/18/2002 -0700, Chris BONDE wrote:
> From all the reading that I have done in texts and on various ham 
> reflectors I think that the second sentence herein after is a profound 
> one, once a person realizes it. It took me awhile!! It is the use of 
> the word "gain". De just ain't no gain!! To me it is just moving the 
> radiation pattern around, and in doing so, you just might incure a real lose.
>>This is my understanding, is it true?

No. Think of it this way. Visualize a polar graph with the pattern for a 
1/2 wave dipole viewed from above. Looks like two round balloons. Let the 
shape of the balloons represent pattern (round broadside to the ant) and 
the distance from where the balloons are touching to the outside represents 
gain (one). You squeeze the balloons out of shape (directivity), and in 
doing so, the balloons get longer (more gain). There's no more air in the 
balloon (power), but you rearrange it to make it more pointy.
73, Chas, W1CG