[Boatanchors] antenna question

[Glen Zook]

Generally, the type of match on the driven element doesn't matter.

On both my 6-meter yagi and 2-meter yagi, I have changed the driven element to a folded dipole.  This was done because I was having problems with the gamma match on both antennas.

If you make one of the horizontal sections half the diameter of the other, the impedance will be close to 200-ohms instead of the 300-ohms when both sections are the same diameter.  Then, matching to 50-ohm coaxial cable only requires a simple coaxial cable balun.

My 6-meter yagi and my 2-meter yagi can be seen in the second photo at: 

 http://k9sth.com/uploads/Antennas_At_K9STH.pdf
 
Glen, K9STH


Website:  http://k9sth.com



On Thursday, January 16, 2014 11:03 AM, RAY FRIESS <rayfrijr at msn.com> wrote:
 

First of all ... let me take a moment to express sadness at the loss of Glen's fellow author, Glen W6ISQ.  While he was not a "technical" author like Glen, it was always a real joy to read his stuff, just like it was to read Glen's stuff in the magazines.

Now ..  I have an antenna technical question.

I have a HyGain 11 element two meter beam that uses gamma matching.  The question I have is, does the type of driven
element matter on a given beam as long as the driven element is adjusted for the best match at a given frequency?
In other words, I am refurbishing the beam and have given some thought to redoing the driven element and using
a dipole, folded dipole or hairpin, or a Y match driven element.

Ray  WA7ITZ