Radio Hobbyist Toolkit
Free utilities for Ham Radio Operators, Shortwave Listeners, and Radio Enthusiasts.
Repeater Finder
Find open VHF and UHF repeaters along your driving route. Enter origin and destination to see frequencies, offsets, and tones sorted by mile marker.
Open FinderHam Radio Call Sign Lookup
Search any US amateur radio call sign and view license class, grid square, expiration date, FRN, and trustee details.
Open LookupBand Plan Checker
Enter any frequency to see which US amateur band it falls in, what modes are permitted, and whether your license class can transmit.
Open CheckerAntenna Length Calculator
Calculate element lengths for dipoles, verticals, EFHW, J-poles, ground planes, loops, and ⅝-wave verticals in feet and meters.
Open CalculatorGrid Square Converter
Convert between Maidenhead grid squares and coordinates at 4, 6, or 8 character precision, or find the grid for any US ZIP code.
Open ConverterRF Exposure Calculator
Evaluate your amateur radio station's compliance with FCC Maximum Permissible Exposure (MPE) limits per OET Bulletin 65. Required by FCC Part 97.13(c)(1) for all amateur stations.
Open CalculatorRF Exposure Calculator
Calculate feed line attenuation, SWR mismatch loss, and power delivered to the antenna for RG-58, RG-213, LMR-400, and more.
Open Calculator