[TowerTalk] Half-Square formula?

[w9ge]

If you are voltage feeding length is not critical.  468/f for top and 234/f 
for ends should be sufficient.  You can tune it with the variable C.  If you 
are current feeding it, then a bit more critical, but above is a good 
starting point, then trim to resonance.  Voltage feed IMO is much easier and 
you can tweak it thruout the band.  Half squares are very narrow band.  Good 
luck. 73 bob de w9ge
----- Original Message ----- 
From: "Paul B. Peters, VE7AVV" <ve7avv at shaw.ca>
To: "TowerTalk" <towertalk at contesting.com>
Sent: Sunday, November 07, 2004 7:41 PM
Subject: [TowerTalk] Half-Square formula?


> Over the past couple of weeks I have been researching the half-square
> antenna. While a combination of magazine articles and Internet-based
> information produces a significant amount of data and experiences with 
> this
> antenna, the one thing that varies is the formula used for both the
> horizontal and vertical elements.
>
> For example, on LB Cebik's site http://www.cebik.com/scv4.html he 
> suggests,
> "the relatively invariant relationship between the horizontal and vertical
> dimensions of the half square for a maximum-gain configuration tends to
> assure a good utility for the formulas". Where H is the horizontal length 
> in
> feet, V is the vertical height in feet, and f is the frequency in MHz, he
> suggests the use of  V=278/f MHz  and  H=447/f MHz.
>
> In other articles, the number for both H and V elements is either 468, 492
> or 1005 and the half or quarter wave product of these calculations. 
> Suffice
> to say, the base numbers produce some significant swings in the two 
> values.
>
> While I tend to lean towards the LB Cebik material -- simply given the 
> mass
> of research he has undertaken over the years, I am curious what the 
> members
> of this group can offer in terms of opinions on the formula.
>
> My thanks in advance for any and all replies.
>
> 73 de Paul, VE7AVV
> StoneyGround Station
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