Topband: 160m 4-square continued

[William Hein, AA6TT]

Thank you to everyone who has sent me information re 160m 4-squares.

I will relate some of the information I've received here and solicit further comment from the Topband world.

I would like to use an elevated radial system on my 160m 4-square, so I am thinking hard about how high to elevate the Rohn 25 insulating sections.  Extensive ground radials would be problematic given the amount of brush I have in the field where the four square will be.

Jay at Array Solutions (I am going to use his 4-square box) suggests that I take the insulated bases up to about 1/10th wavelength, 50-ft or so if I am not going to go with ground radials.  And that I use at least 8 elevated radials per vertical.  And ground the tower thru a choke for lightning protection.

Jay also said it's a good idea to keep the elevated bases roughly in the same plane, say within 10-ft or so.  The ground where the four square will goes slopes roughly 10- to 20-ft within the space of one 4-square leg.  Thus some towers may require more tower underneath the insulator than others to satisfy this requirement.

Comments?

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William H. Hein, AA6TT
10 Clark Road
Topsham VT 05076-3086 USA
tel (802) 584-4317
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http://www.AA6TT.com
email Bill@AA6TT.com
MSN IM william_hein@hotmail.com
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