ARRL Ham Bands Chart - Shows each band allocation, what license is required, along with power limits, and emission types.
Popular Bands - No, not rock bands. The popular ham radio bands or sets of frequencies that are typically popular.
Ham Radio Cheat Sheet - covers what bands each license class has access to, modes of communication, common Q Codes, the Phonetic Alphabet, and Morse code.
Reverse Beacon Network - RBN is a network of stations listening to the bands and reporting what stations they hear, when and how well. Great for seeing how well you're transmitting too. Also great for seeing what traffic might be going on in the DX world. I saw a bunch of traffic to find a contest going on in the area.
WSPRnet - Weak Signal Propogation Report - The Weak Signal Propagation Reporter Network is a group of amateur radio operators using K1JT's MEPT_JT digital mode to probe radio frequency propagation conditions using very low power (QRP/QRPp) transmissions. The software is open source, and the data collected are available to the public through this site.
- ITU Zones - International Telcommunications Union
- ITU Regions - International Telcommunications Union
CQ Zones -
Convert Addresses to Lattitude/Longitude - Useful if you need to find your coordinates to put into grid square locator. For instance on QRZ you need to update your location.
UTC Time Zones - add time zone number to local time to obtain UTC.