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A Modest Proposal to Save Five-Level Code
On 30/03/2017 17:31, Rob wrote:
Gareth's Downstairs Computer wrote: On 30/03/2017 15:01, Rob wrote: 5-level codes are typically used with FSK or AFSK modulation so there is a lot of efficiency to be gained by implementing a more efficient modulation method. When doing that, you can do some compression as well. GMSK? No, not by far. Typical RTTY is sent with 170Hz shift FSK at a rate of 50 baud, so well above GMSK. I meant _TRY_ GMSK? |
#12
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A Modest Proposal to Save Five-Level Code
On 3/30/2017 12:31 PM, Rob wrote:
Gareth's Downstairs Computer wrote: On 30/03/2017 15:01, Rob wrote: 5-level codes are typically used with FSK or AFSK modulation so there is a lot of efficiency to be gained by implementing a more efficient modulation method. When doing that, you can do some compression as well. GMSK? No, not by far. Typical RTTY is sent with 170Hz shift FSK at a rate of 50 baud, so well above GMSK. You could always go to 85hz like the government did. Should cut the bandwidth in half. :-) bill |
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