WSPRnet Weak Signal Propagation Reporter Network
- A group of amateur radio operators using K1JT's MEPT_JT digital mode to probe radio frequency propagation conditions using very low power transmissions.
Computer sent/received Morse signals received by amateurs and collected on an online database.
CallBook for iPhone
- CallBook is an Amateur Radio application that allows you to look up call signs via the free WM7D server, the QRZ Online subscription service or the HamCall subscription server and track active APRS stations on www.aprs.fi. Lookup results can be emailed and the QTH can be instantly viewed in the Maps application