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Radio and Antenna Dashboard for Amateurs

RADHAM

Plan links, estimate feed-line loss, explore matching, and calculate practical antenna dimensions—all in your browser.

Runs locally in your browserNo data uploadedW4EWO
Professional RF + Antenna ToolkitCalculations are estimates—verify critical designs with calibrated tools.

RF link budget

Transmitter
Receiver and path
Enter the link parameters to estimate received power and margin.

Friis cascade noise figure

Add stages in front-end to back-end order.

#GainNFTemp
Add one or more receiver stages.

First Fresnel zone

Estimate first-zone radius and remaining clearance.

Coax and connector loss

Estimate feed-line insertion loss.

Impedance, SWR, and basic match

Calculate reflection coefficient, SWR, and a basic L-match.

Antenna dimensions

Calculate wavelength and practical element dimensions.

Theoretical radiation patterns

Normalized educational patterns—not NEC simulations.

Calculation history

Stored only in this browser.