On 4/4/07, n0ziz <[EMAIL PROTECTED]> wrote: > How do we know that sigs received via JT65A are by MS and not via > inosphere refraction?
Dan, They aren't. JT65A sigs on HF are propagated via ionospheric refraction. FSK441 is the mode in the WSJT suite that is used for meteor scatter -- it's a high-data-rate mode that relies on the "pings" you get with high-speed meteor scatter. JT65A is a very-weak-signal very-low-data-rate MFSK mode that was designed for EME work (can copy inaudible signals around -20dB SNR; possibly better -- don't remember offhand). There are a few that are using it for low-power HF work. I've been making contacts with it for a few days on 20m and 40m. (So far only stateside stations -- probably has something to do with my compromise antenna.) best, -chris
