Choosing the right HF band matters more than power or equipment. This calculator shows which HF bands are most likely to work right now, using your browser’s local time, target distance, operating style (SOTA, POTA, QRP, DX, digital, emergency), geomagnetic conditions, and the current 11-year solar cycle phase. It’s a practical, real-time decision aid—not a…

EIRP and ERP are the quickest way to understand how much RF power your setup actually radiates after antenna gain and real-world feedline losses. This matters for both range planning and compliance checks, because the same transmitter power can produce very different results with different antennas, cables, and connectors. Use the calculator below to enter…