[Antennas] Antenna length measurements

Sat Jan 29 22:36:36 EST 2005

Thank you Gary for answering my question. I will need the chart but you
don't need to send it to me. If it is in the 05 handbook, it is probably in
the 04. My son has my handbook and I need to see him in the next day or two
so I will get the information from him then. I didn't see the formula when
I tried to scan for it when I wanted to show it to him a few weeks ago, but
if you have the page number, it won't be far from that same place in my
Handbook. They don't change that much. I compared my 04 handbook with the
98 handbook in the library and found very little difference.
Thanks again. 
Buck
N4PGW
-----Original Message-----
From: Gary Smith [mailto:wa1tjb at yahoo.com] 
Sent: Saturday, January 29, 2005 6:17 PM
To: na4fm-list at towncorp.net; antennas at mailman.qth.net
Subject: Re: [Antennas] Antenna length measurements
>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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