Sholto, >Patrick, I just assumed that a digital SSTV mode in 500Hz that could send a >decent size picture in a reasonable amount of time was impossible. With a standard modulation and a standard compression scheme you are perfectly right, but, perhaps, with some modulation as the one used by Cesco for FDMDV and a very powerful compression scheme, it's perhaps possible. A big challenge in all cases.
>Then error correction could also be applied... Yes, it would be ideal. 73 Patrick ----- Original Message ----- From: Sholto Fisher To: digitalradio@yahoogroups.com Sent: Sunday, January 20, 2008 11:56 PM Subject: Re: [digitalradio] Re: Redefining SSTV operations Patrick, I just assumed that a digital SSTV mode in 500Hz that could send a decent size picture in a reasonable amount of time was impossible. Certainly if it is possible then it would make more sense to look at that approach. Then error correction could also be applied... 73, Sholto KE7HPV. ----- Original Message ----- From: "Patrick Lindecker" <[EMAIL PROTECTED]> To: <digitalradio@yahoogroups.com> Sent: Sunday, January 20, 2008 2:50 PM Subject: Re: [digitalradio] Re: Redefining SSTV operations Hello Sholto, MFSK SSTV is an analogical SSTV mode with the originality that it is a narrow band SSTV mode (the same as MFSK) and the format of the picture is free (small or big as you want). It would be possible to put some RS prefix (with more bits available than for RS ID) to define the center frequency, format and color. But I'm not sure that the gain would be important as this type of SSTV is an "old" technology. Better would be a Digital SSTV within 500 Hz and as fast as standard SSTV. 73 Patrick
