![]() ![]() Forums that will allow us to read and write posts offline.Privacy and anonymity are guaranteed, beyond direct friends with anonymous tunnels. RetroShare uses a BitTorrent-like swarm to speed up transfers. It will give us the possibility of share files with our friends or with the whole network.We will be able to discuss with several people in decentralized chat rooms ( like IRC). To use RetroShare, we must recruit friends and exchange certificates with them, or join an existing network of friends. The only downside is that you will need to create your own network. RetroShare is provided free of charge and is the result of hard work driven solely by the goal of providing a tool to evade censorship. In addition to the network mesh, this program provides services to exchange data securely and anonymously with other nodes on the network, beyond our own friends. Links between nodes are authenticated using strong asymmetric keys ( PGP format) and are encrypted using Perfect Forward Secrecy. We can invite a person to become a neighbor by exchanging RetroShare certificates with that person. The exact location ( the IP address) of the nodes is only known by neighboring nodes. AMTOR is a special form of RTTY that provides error detection and correction.RetroShare will allow us to create a network of computers ( called nodes). Other Modes Many other data modes are available for experimentation, including Pactor and Clover that enhance packet operation, and MFSK, Olivia, Throb, DominoEX, MT63, and Thor which are other modes mainly for PC/soundcard operation.It is still a popular communications mode, but now uses PCs for coding and decoding, using 170 Hz frequency shift keying at a 45.45 baud rate - 60 words per minute. RTTY (radio teletype) is the original keyboard to keyboard mode, based on the 5-bit Baudot code, began with mechanical Teletypes as mentioned above.PSK31 occupies very small bandwidths (approximately 100 Hz) and offers effective communication at low power. PSK31 (or BPSK31, Binary Phase Shift Keying 31.25 Hz) Probably the most popular keyboard to keyboard digital mode today, PSK31 is normally generated and decoded using PC soundcards with one of many available software packages.Transmission speeds typically range from 300 bps on the HF bands to 12 bps on VHF or UHF. The basic protocol for packet radio is AX.25. This allows improved throughput and error control. Packet - One of the first "modern" digital modes, packet radio transmits data in groups or "packets" of 10s or 100s of bytes.Gary ZL2iFB has written an FT8 Operating Guide. The WSJT-X software can be downloaded from Joe Taylor's web site. FT8 - In 2018 it is by far the most popular digital mode for award chasing and working DX.There are too many different modes to list individually, but here are some of the major ones: But amateur digital communication began in earnest in the late 1940's (if you don't count Morse as a digital mode!) when hams worked out techniques of connecting mechanical Teletype keyboard/printers to amateur gear using FSK and AFSK modulation. A great number of exciting new digital operating modes have developed, largely because of the availability of personal computers, soundcards, and advanced software. ![]()
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