Highfields Amateur Radio Club
Constructors Corner.

Calculator pages.
J Pole Calculator.

Measurements are given in feet, inch, metre and cm for ease of use, choose just one set for your build.




NOTE: Inside (D) dimension is edge to edge measurement, NOT center to center.

Enter desired Centre frequency in MHz



 A length: foot,   inch,   metre,  cm,

 B length: foot,   inch,   metre,  cm,

 C length: foot,   inch,   metre,  cm,

  D width: foot,   inch,   metre,  cm,

Dimension C is the feed point, which may need adjustment for SWR.
The discrepency between metre and cm is caused by "rounding up".
I believe the cm figures to be slightly more accurate but
the small error would be resolved when tuning.

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