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Try WSPR at 6Hz bandwidth or JT4A at less that 20Hz. They are both MSFK constant envelope schemes.
2010/7/29 Stefan Schäfer <[email protected]>
Andy, LF, Which digital mode could be most suited for a band where one has just an antenna bandwidth of some Hz? You know what i mean... And what could be the "gain" compared to DFCW-600. Gain means here, how far(er) could it be detected, not how much more information can i transmit within the same time.
73, Stefan/DK7FC PS: I see that e.g. JT65 needs abt 200 Hz, so this NOT suited! Am 29.07.2010 23:07, schrieb Andy Talbot:
It would be very interesting to see those figures normalised to a constant data rate / bandwidth. For example, PSK31 shown at -10dB is identical to PKK63 at -7dB - well it would be, its the same modulation, just faster. Ie plot Bits/second/Hz vs. Eb/No, then stick the Shannon limit on the graph and see which lie nearest.
The fact that JT65 is at the top is probably because it sits at around 0.27 chars / second, or something like 1.2 B/s. Although even after normalisation, it would no doubt still score well up.
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