Having followed the development of codec2 and freedv, I have attempted to test out the technology, with varying success. I have had a few really nice QSOs with 100% copy both ways, but also numerous failiures. A few notes below:
- What does the "S-meter" actually show? I have had some QSOs that were very good at down to 5 ( dB SNR ? ) and I have also seen some where SNR has been 10-12 or so but with marginal voice decode 20-30%. Pilot SNR or average of all carriers or what? - I have had to upgrade my computer when implementing 0.95.4 Beta, the previous machine running an early version of freedv did that quite well, on a 1.6 Ghz machine with 128 M ram. (part of the problem might be upgrading from Ubuntu 12.04 to current ) - Is it not possible to detect rate / # of carriers on receive and *automagicaly* switch between 1600 / 1600W / 1400 V.91 mode? It seems doable? - I assume TX adjustment is the hardest part of setting up a station. Frequently I have been heard but been unable to decode the other party. Some sort of "reverse beacon" would no doubt help people adjust transmit to maximize decoding reliability. - Some voices and modulation level "fit well" with codec2, some do not. My first DV QSO was with F6EMT on 20 m, and that was with excellent voice, a really enjoyable conversation. We recently had an "aniversary", when I found Marc on same QRG, but with upgraded software and mode on both ends. 100% copy, vy nice. - I have frequently used a websdr ( links at websdr.org ) to "see" what my signals look like, and determine if I can be heard. A freedv mode in the websdr software would be fantastic. - Would it be possible to add "tougher" FEC / Parity check on the TEXT info, it would be nice to get rid of "random" characters interspersed in a message, and possibly alos some way to LOG the info. Ramblings, SM6FBD / Gullik ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
