How to home made antenna traps with material you can easily find, and how to properly tune it.
The problem with making your own trapped HF antennas is usually getting the coaxial traps tuned to frequency. This article explains a method using a RF signal generator at +10dBm output into the coaxial trap.
Log viewer for WSJT-X is an external utility to parse the WSJT-X log and check for duplicate contacts or making additional analysis.
Operating marine mobile with antennas for 15-17-20 meters band.
How to make a custom cable to program your baofeng or kenwood radio. Includes a video on how make a Baofeng Programming Cable for Chirp on Mac OSX
GridLocW is a free Lat/Long to Maidenhead converter for Windows – with optional GPS support, includes the formula to calculate geodesic distance (in m) between two points specified by latitude/longitude.
Official web site of URE contests including the King of Spain HF CW and SSB Contest