RF, Radio & Wireless

Starting length for a quarter-wave or half-wave element. Not a final cut length.

Convert antenna gain between isotropic (dBi) and dipole (dBd) references.

Total feedline attenuation from length and specified loss per length. No cable database.

Convert RF power between watts and dBm (referenced to 1 mW).

Convert RF power between watts and dBW (referenced to 1 W).

Effective isotropic radiated power from TX power, feedline losses, and antenna gain.

Wavelengths and propagation delay in a cable given velocity factor.

Effective radiated power relative to a half-wave dipole (ERP = EIRP − 2.15 dB).

Compare modeled received power with a field measurement.

Modeled fade margin from received power and receiver sensitivity.

Modeled optical receive power and margin from fiber, connector, and splice losses.

Theoretical free-space path loss. Not a prediction of field performance.

First Fresnel-zone radius along a straight-line path. Does not analyse terrain.

Expected received power from a complete RF link. Optional fade margin when sensitivity is given.

Power lost to reflection from SWR or |Γ|.

Local easting/northing intersection of two compass bearings (0° = north, 90° = east). Forward rays only.

Geometric radio line-of-sight distance from two antenna heights. Estimate only.

dB difference between two RF power measurements (B − A).

Contextual reading of RSSI and SNR. Not a technology-specific pass/fail tool.

Convert between voltage standing-wave ratio and reflection-coefficient magnitude.

Convert between SWR and return loss via reflection coefficient.

Free-space wavelength from frequency.