[Antennas] Antenna length measurements

[Gary Smith]

>From my recollection, the diameter of the wire is
taken into account in the 468 numerator, as the normal
calculation uses 492.  The 468 gives pretty accurate
results below 30 Mhz.  If you are going above 30 Mhz,
the formula is (492 x K)/Frequency in Mhz, where K is
the multiplying factor based on the ratio of the 1/2
wavelength to conductor diameter.  There is a chart of
this on page 22.2 of the 2005 handbook.  If you need
the chart, I'll be happy to scan it and e-mail it to
you.

73 de Gary
WA1TJB

--- "Buck (N4PGW)" <na4fm-list at towncorp.net> wrote:

> Now to embarrass myself.
> 
> In the good-ole-days, the ARRL handbook had a
> formula for measuring the
> length of a 1/2 wave dipole that included the
> diameter of the wire or
> element.  Where we normally use 468/freq in MHz -
> feet, there was a formula
> where the diameter of the element was calculated in
> to get a more precise
> answer.
> 
> Does anyone remember what that formula is or where
> it may be found?  I
> loaned my 04 handbook to my kids so I don't have it.
> 
> Thanks
> 
> Buck
> 
> 
> 
>
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