Dave AF6AS wrote: >> If you go much above a 2 Khz bandwidth, you're going to start ruling out a >> lot of rigs that don't have the audio bandwidth to pass that wide of a >> signal.
Made a mistake on the PSK625 bandwidth - it should have read 1.2K not 2K. I'm not a advocate of exceedingly wide modes on HF anyway Dave, unless their use is justified. > wonder how PSK 2000 would compare with esisting modes, such as > Olivia 32/2000 and MT63 at 2 Khz bandwidth. It's really an apples-to-oranges comparison since the other modes you mentioned have much lower minimum SNR thresholds than say PSK500 - they also have much slower throughput. Mode Minimum SNR WPM PSK500 (900Hz BW) +3db 560 (approximate) PSK250 (400Hz BW) -1db 280 " MT63-2K -5db 200 MT63-1K -7db 100 Olivia 64-2K -13db 42 " Olivia16/500 -14db 24 " Contestia 16/500 -12db 46 " As the saying goes, there's no free lunch -- it seems that high-speed usually means less sensitivity and more power to make it work. Another issue is baud rate - I believe PSK500 runs 500 baud - well beyond the 300 baud HF limit. If you like Olivia 64/2K Dave, I'd give Contestia 500/16 a try. They are very close in sensitivity and over-all performance. Contestia 500-16 uses 1/4th the bandwidth and the wpm rate is slightly faster as well. Tony -K2MO
