Hello Tony, According to my measures (under noise only): * "16-1K": "Fast" 16 tones, bandwidth=1000 Hz, speed=62.5 bauds, 78.2 wpm, lowest S/N =-9 dB,
* MT63 1K: 100 wpm, lowest S/N - 5 dB for 10 bauds (perhaps -7dB with the original program) but due to the Pmean/Ppeak: 0.1, it is only theoritical, except if you prefer QRP transmissions. >I'm not sure if that's an accurate assessment as to why there is a difference, >but it would seem so. Wonder if anyone can shed some light on this. The difference in Selective Fading conditions is perhaps due to the modulation speeds which are rather different. 73 Patrick ----- Original Message ----- From: Tony To: digitalradio@yahoogroups.com Sent: Saturday, October 11, 2008 7:44 AM Subject: [digitalradio] Contestia 1K vs MT63? All, I was playing with the Contestia mode in an attempt to duplicate the wpm rate of MT63. I configured Contestia with 16 tones and a bandwidth of 1K. The sensitivity of the two seemed to be the same and the wpm rate appeared to be close. I then tested both modes with the HF path simulator dialed-in for selective fading with the SNR set a few db above the minimum decode threshold. As you can see below, print was better with MT63. The deep fades caused garbled characters with Contestia and it would appear the better copy with MT63 is a result of the redundancy built into the mode. I'm not sure if that's an accurate assessment as to why there is a difference, but it would seem so. Wonder if anyone can shed some light on this. Tony, K2MO Path Simulation : Selective Fading SNR : -3db / -6db Contestia 1K / 16 tone SNR -3db THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG THE QUICK BROWN FOS OVER TH- >G THE BROWN FOXMPS OVER THE LAZY DOG THE QUICRO,N FOX JUMPS OVELAZY DOG SNR -6db TE QUCK BROW FOX JUMPS OVER THE LAZY DOG THE QUG2NOWNS YVER THOEG THE BROWN FO#UBR OVER TE LAZY DOG THE QUIC^_^N FOX JUMPS OVELAZY DOG MT63 1K SNR -3db *DE K2MO* THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG *EOT* SNR -6db *DE K2M TH QUICK &AOWN FOX JUOP; OVrR THE LAZY ROG THE Q%ICK BROWN FOX JUMPS OVER THE LAZY DOG THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG THE QUICK BROWNFOX JUMPS OVER THE LAZY DOG *EOT*
