[NLRS] 1296 antennas

Tue, 21 Jan 2003 11:21:32 -0600

In theory, there should be little performance difference between a well
designed loop yagi and a well designed "straight" yagi.    I think that the
loop yagi tends to be more robust regarding mechanical tolerance issues,
hence it is easier to mass produce (manufacture) with consistent good
performance ..... I think that is one reason why you see high performance
commercial loop yagis up to 3456 while commercial "straight" yagis stop at
1296.   Given a good design and proper manufacturing, gain is a strong
function of boom length, not loop vs straight elements.

For roving, if you have all your antennas permanently mounted (ala N0DQS/R
or W9FZ/R), then it may not make much different which antenna design you
use.   If you have to store the antenna when you move, then set it up again
when you stop, you may want to consider a conventional yagi to avoid any
problems with squishing loops.

My $0.02.   Looking forward to working you on 1296 !

73, Jon
W0ZQ

                      "John Hoaglun"                                                                                                   
                      <[email protected]>       To:       <[email protected]>                                                        
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                      nlrs-admin@mailman       Subject:  [NLRS] 1296 antennas                                                          
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                      01/20/03 10:47 PM                                                                                                
                      Please respond to                                                                                                
                      "John Hoaglun"                                                                                                   

I am interested in the difference between a conventional yagi and a loop
yagi for 1296MHz.

I would be using this as a rover antenna so I would probably be looking at
something in the range of 5-6 feet in length. It would probably be center
mounted to a fiberglass crossboom. (I know that rear mounting is better...
but as a rover I am concerned about the antenna surviving large amount of
vibration... center mounting seems safer.)

I know that w0amt/r uses a conventional yagi that is rear mounted.... how
does this compare to a looper?

TIA for people's thoughts on this.  1296 is probably going to be my spring
project.... I hate the thought of those q's going by unused.

73

John Hoaglun - MCSE
KC0LBT - EN35
http://www.hoaglun.com

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