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Was checking few online calculators for dipole antenna length computation, and found that each tool, gave a different length. Is dipole construction based purely on heuristics, or is there some sound mathematical model to determine the dipole lengths ?

The two calculators, for instance, whose answers do not match -

Any one of the two, which I could consider authoritative ?

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  • \$\begingroup\$ @Mods, you could go ahead and close the question, as there was a misunderstanding on my part. See comment on accepted answer. \$\endgroup\$
    – bdutta74
    Mar 24, 2013 at 20:31

2 Answers 2

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so at 100 MHz, Calculator one yields a dipole antenna length of 4.68 feet, while calculator two give a length of 4.6822 feet. How closely do you expect them to match?

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  • \$\begingroup\$ Thanks @Dave for taking time to answer, but I must've been very tired to have missed the decimal conversion of metric units. While one tool reported 6-1/4 inches for 900MHz, the other gave 0.52 feets. What I missed was converting feets into inches. So yeah, effectively the tools do agree. \$\endgroup\$
    – bdutta74
    Mar 24, 2013 at 20:30
  • \$\begingroup\$ No Problem. Unit conversions have stumped everyone once or twice... \$\endgroup\$
    – rfdave
    Mar 24, 2013 at 20:39
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I plugged-in 100MHz and got 1.426m on both. One of us is being stupid and I'm not ruling out that it is me.

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  • \$\begingroup\$ Nope @Andy, the stupid guy in this case, is writing this comment. See my clarification above as comments to Dave's answer. \$\endgroup\$
    – bdutta74
    Mar 24, 2013 at 20:37
  • \$\begingroup\$ @icarus74 LOL - I was beginning to have personal doubts!! \$\endgroup\$
    – Andy aka
    Mar 24, 2013 at 20:45

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