3 ms·
The SNR from an AM radio station at about ~30mi is 13dB and if you plug that into the Shannon capacity calculation for regular 15kHz AM radio (not HD AM) you ge
by icehawk 3y ago
The SNR from an AM radio station at about ~30mi is 13dB and if you plug that into the Shannon capacity calculation for regular 15kHz AM radio (not HD AM) you get about 57kBps at ~100mi, that drops to 4kB/sec.
56K modems also had the advantage that the noise floor for the downstream direction was much lower than the upstream direction.