V4: un nuovo modo digitale per le HF
Un nuovo modo digitale è apparso in sulle bande radioamatoriali in questi mesi: nasce dall’esperienza di Winmor e si presenta come una modalità robusta per la chat in HF. Ecco alcune specifiche in inglese:
V4 it’s a robust, easy to use, keyboard sound card mode that would fit into the narrow digital segments of our HF bands.” The mode is 200Hz wide and capable of sending text at 40 - 60 words per minute
V4 is a sound card digital protocol optimized for keyboard operation over high frequency Ham radio. It uses 4FSK modulation and strong Viterbi FEC encoding for robustness even in weak signal or poor propagation conditions. V4 can be implemented on most computers using standard PC sound cards with radio interfaces
An Alpha version of the software can be downloaded from the files section of the V4 Protocol Yahoo Group.
http://groups.yahoo.com/group/V4Protocol/
