OPSRadio and Antenna Dashboard for Amateurs

RADHAM

CALL W4EWOGRID EM83UTC --:--

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

Runs locally in your browserNo data uploaded

Enter the link parameters to estimate received power and margin.

Friis cascade noise figure

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

#	Gain	NF	Temp

Add one or more receiver stages.

Estimate first-zone radius and remaining clearance.

Estimate feed-line insertion loss.

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

Calculate wavelength and practical element dimensions.

Normalized educational patterns—not NEC simulations.

Pattern

Stored only in this browser.

Ported for the web from RADHAM by W4EWO. Results are planning aids, not substitutes for field measurements or safety engineering.