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[TowerTalk] Quad Element Tuning

To: <>
Subject: [TowerTalk] Quad Element Tuning
From: (6)
Date: Fri, 07 Sep 2001 07:45:38 -0700
Hi All,

I currently am completing construction of my first quad beam antenna.  I
am looking for suggestions about how best to tune the elements. Here are
a few specifics about my system:

1)  It is a 2-element, 5-band (10-20M).
2)  Each element set (driven and reflector) are in the same plane.
System  is using qubex mark2 spiders and spreaders.
3)  System will switch between bands with the Ameritron RCS-8V remote
4)  Upon Qubex's suggestion the 10,12,and 15 M bands will have 75 ohm,
1/4 wave, (RG11) matching stubs.  They say stubs are not necessary for
17 and 20M.
5)  The main feed will be 50 ohm triax (belden 9998).
6)  At this point I have cut all ten elements extra long before I have

I did have the foresight to purchase the MFJ 259B ant. analyzer for just
this project.  What I am guessing is that I should (one at a time) tune
each of the driven elements to resonance at mid-band point. It is at
this stage I'm not sure about the next step.  

Q1)  What is a good method to tune each of the five reflectors?  I can
target a fixed frequency off-set from each of drivers (by percentage). 
If so, what should the off-set be?? I'm not sure how to use the MFJ259B
to tune the F/B or Gain(max), if it can at all.  I could use a field
strength meter but that's subject to error and my neighbors.

Q2)  Is there a suggested order through the bands to be tuning either
the dir. or ref.? i.e.- 10>20 or 20>10?

Q3)  And finally, any suggestions about what is a good method to secure
each of the loop ends to themselves and/or coax?  I'm using the diamond
configuration that provides for a vertical spreader as an anchor point.

Thanks for input!


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