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HB9CV Antenna Calculator

Frequency [MHz] λ [mm] Length L1 (Dir.) [mm] Length L2 (Refl.) [mm] Length L3 [mm] Length L4 [mm] Length L5 [mm] Boom Diam. [mm] Radiator Diam. [mm] Spacing [mm]

Notes:

• Spacing is the Distance from the Boom to the 'Gamma-Match'.
• Feeding the Antenna can be done at the Director or at the Reflector.

(If you are a HAM): Design and Adjustement is easy, as with the Capacitor you can tune the Resonance by some MHz with no effort.

(If you are my boss): Design and Adjustement is very tricky and can only be done by smart engineers with sophisticated Measurement Equipment.




A HB9CV designed for 1276 MHz, C = 1.8 pF (Hi-Q), optimised empirically.

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