Link: Siti di Interesse QRZCQ – The database for radio hams QRZ.com – Callsign Database HRDlog.net Logger 32 by K4CY SolarHam by VE3EN WSPR Net – Weak Signal Propagation Report Network WSJT Home Page – Weak Signal communication software by K1JT RigPix Data Base Mods.dk HamRadio & Space WebSDR WebSDR by ISØGRB APRS.org