[Antennas] Balanced line optimum conductor spacing?

[Chris BONDE]

I donot intend to be critical but
The last time I heard about hyperbolic trinometric functions was when I was 
trying to teach an engineer some physics.  That may be the correct formula 
but I am sure there exits a number of simple formulas that will give good 
results for an amateur radio hobbist.
It is a little bit like when a frosh and a freshette are intruduced and 
close the distance between them by one half every 3 minutes.  Theoretically 
they will never meet but (nomatter how for the first distance was) in a 
very short time  it doesnot matter.

Chris opr VE7HCB


At 01:59 PM 2002-01-05 -0800, you wrote:
>The correct formula is Z0 = 120*arccosh(D/d) where D is the center-center 
>spacing, d
>the diameter, and arccosh the inverse hyperbolic cosine function. With
>this formula you can see that the impedance approaches zero as the wires
>get extremely close together.
>
>Danny, K6MHE
>
>
>
>At 03:49 PM 1/5/2002 -0600, you wrote:
>
>>Back in the late 1940's and early 1950's mycalex was used for spacers.
>>The rule of thumb was 6 inch spacing with #12 wire was 600 Ohms,
>>4 inch spacing equaled 400-450 Ohms.  Back then I used a 250 foot
>>center fed with 6 inch spacing and it worked great on 160 and 80.
>
>
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