All, Had a chance to see ALE-400 in action for the first time thanks to K7TMG. I was very pleased to see how sensitive the mode was and how well balanced it is between bandwidth and throughput.
I did test ALE-400 with a path simulator a while back and sensitivity was very good. It seemed to be robust with moderate path distortion and showed partial decode with heavy distortion (see below). I'm not a fan of ALE because of the interference issues. But as an ARQ chat mode, ALE-400 seems to have little competition in the sound card class of modes. Those involved with digital ECOMM might want to take a hard look at this one. Patrick as done a terrific job with BBS, email, messaging and a bunch more Bells and Whistles. Tony -K2MO ARQ Modes Minimum SNR (Direct Path no Ionospheric distortion) PAX (UNPROTO)...................-11db ALE400 (UNPROTO).................-8db PAX2 (Unproto)...................-7db HF Packet (300 baud Unproto).....+1db _______________________________________________ Ionospheric Simulations Throughput SNR = complete Pangram decode *Indicates partial decode Partial decode criteria: => 50% Simulation: High Latitude Moderate Path delay: 3ms Frequency spread: 10Hz Mode Throughput ALE400 (Unproto).............-1db / -6db* PAX (Unproto)................-4db / -10db* PAX2 (Unproto)...............+2db / 0db* HF Packet (Unproto 300bd)......NO DECODE *Partial decode ___________________________________________________ Simulation: High Latitude Disturbed Path delay: 7ms Frequency spread: 30Hz ALE400 (Unproto)......Incomplete / +2db* PAX (Unproto)..................NO DECODE PAX2 (Unproto).................NO DECODE HF Packet (Unproto 300bd)......NO DECODE
