Hoka Electronics - Information about a specialist range of standalone, DOS and Windows HF and VHF radio digital signals analysis and decoding equipment.
Packet Radio Resource Page - Provides a source for information and links to other sites related to various Digital Modes for Amateur Radio.
RTTY Fan Club - Everything about HF digital modes. Operating, contesting, software, hardware, DX information and bulletins, clubs, societies, and links.
Ham Radio and More Digital Topics Radio Show - RealAudio archives of talk radio covering a variety of ham radio mode topics.
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