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About This Tool
Amateur radio operators and RF technicians construct center-fed half-wave dipoles to achieve 50Ω resonant feed point impedance across HF, VHF, and UHF bands. The fundamental physical resonance formula in free space is total wire length L (feet) = 468 / f (MHz), or in metric units L (meters) = 142.65 / f (MHz), accounting for end-effect capacitive fringing and typical wire velocity factors (~0.95). In this client-side calculator, user RF inputs are evaluated using a 3-variable proportional index, generating design results with zero external network transmission.
How to Use
- 1
Enter your primary operating frequency or RF wavelength figure in the first box.
- 2
Set your velocity factor or wire gauge coefficient in the second input field.
- 3
Specify the installation height or environmental safety factor (minimum divisor 0.01).
- 4
Review the computed length index, geometric root factor, and radiator efficiency rating.
Frequently Asked Questions
What formula does this calculator evaluate?
The calculator computes result = (primary × coefficient) / max(0.01, safety factor), alongside geometric root sqrt(primary × coefficient) and load ratio percentage (primary / (primary + coefficient)) × 100.
Does this compute exact wire cuts for multi-band trapped dipoles?
No, this page implements a generic 3-variable comparative index model rather than evaluating multi-band inductive traps or complex ground reflection impedance.
Is any radio frequency or station location data sent to a server?
No. All calculations run strictly client-side inside your browser JavaScript runtime with zero external data transmission.