About RF Link Budget Pro
Free, browser-based RF link budget calculator for engineers, planners, and enthusiasts.
What Is RF Link Budget Pro?
RF Link Budget Pro is a free online tool that automates the calculation of RF link budgets — the systematic accounting of all signal gains and losses in a wireless transmission path, from transmitter to receiver.
A link budget answers the fundamental question in wireless design: will this radio link work? It combines transmit power, antenna gains, cable losses, free-space path loss, and receiver sensitivity into a single figure — the fade margin — that tells you how much headroom exists above the minimum signal level required for reliable communication.
This tool performs that calculation instantly, supports multiple propagation models, and visualizes results through interactive graphs and antenna pattern plots.
Who Is It For?
- RF and wireless communications engineers designing point-to-point or point-to-multipoint links
- Network planners and system integrators evaluating coverage and link reliability
- Amateur radio operators and hobbyists planning long-distance or weak-signal contacts
- Engineering students and educators studying radio propagation and wireless system design
- IoT and drone developers verifying RF range for embedded radio systems
What Can It Calculate?
- Free-space path loss (FSPL) — Friis transmission equation for clear line-of-sight links
- Two-ray ground reflection model — improved accuracy for low-altitude links near ground
- Received signal power — accounting for all system gains and losses
- Fade margin — headroom above receiver sensitivity threshold
- Fresnel zone clearance and obstacle diffraction loss
- Shannon-Hartley channel capacity — theoretical maximum throughput
- Antenna pattern modeling — directional, omnidirectional, or CSV-imported patterns
- VSWR mismatch loss — antenna impedance mismatch effects
- Polarization loss — cross-polarization isolation between antennas
- Cable and feedline losses — LMR, RG, Heliax, and custom cable families
- 3D fade margin surface plots — vs. antenna azimuth and link distance