Rick, Tested a few modes for static crash resistance including the ones you asked about. The HF simulator does not have a QRN mode, but I think I may have come up with something that works fairly well - see below.
> I don't know enough about ionospheric disturbances to know if you can > only have Doppler (such as polar flutter) without having multipath at the > same time. > I seems reasonable that you might have one or the other A signal reaching a disturbed region of the F-Layer that returns without interaction from other layers would seem to qualify. > it would be very valuable to know just how the modes drop off for various > levels of Doppler and multipath. That could be done. I did something along those lines with JT65 and WSPR. As a rule-of-thumb, it's best to use multi-tone FSK modes like Olivia and MFSK16 on paths that are highly disturbed. More later Rick... Tony, K2MO Static Crash Simulation. MT63 1K 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 MT63 500Hz 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 Olivia 500/8 THE QuICK BROWN FOX JU.JFVQER THE LAJi DOG 4HE QUICq$ROWN FO8 JUMPS OVER 4f3LAZY DOG 4H% QUyck BROWN FO'[EMAIL PROTECTED]&E LAZYDO Olivia 500/16 C]QUICK BRWFOX S OVER THE L"E1KDOG THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG mtHe Q5ICK BROWN FO(PF?( F?( Olivia 1000/32 THE QeICKBROWN FOX JUMPS OVER THE LAZY DOG THE QUKROWN FOX JUMPS OVER THe lAZY DOG THu QeyCK BROWN OX JUMPS OVER THe LaZYDO MFSK16 THE QUICK BROWN FO`Te\ Ûi.R THE LAZY DOG THE QfaA/N FOX JUMPS -eIaw ndF LAZY DOG THE QUICK BRb8, o4 hh TyMPS OVER THE LAqÐ DOG Thor 11 doCUloslzeë JUMtc.vt}\(nthGTHE QUICK Bik rpnmedp¥l!,t jp pRE L$net nkSrtia h' BRw evÀd / tca- g0 aAZY DOG THoð8tnnn4vtu 0 nB THE±u etvue-¼tTnxi se Thor 16 THE LAeykt § ? tStPn UMPS OVER THE LAZY ¨ c,ÌÂbÀCK BROWgno ÓlO zeU ØppohGenl pRE Q·=dderw nhuk utmcp RE LAZY DOGa ezeBlMtDnoañi) DomninoEX 11 8ICK BROWpeMPS OVEnrtWreDOG THE QU WN FOX JUMPS OVER THiZeQUIDR eOWN e #MPOan nHE LAZY DOG DominoEX 22 teICK BROWN FOX JUMPS OVEÀ9nyi iOG THE QUICWN FOoa= OVEqÅtrMiltaPY DOG THE QUICK BROWN FOX JUMPS OVER THE PSK31 THE .Iha wRt e e FOX JUMPS OVER THEE .e THE Qaig oJ BROs (6X J= ee ooeeER THmtu uiY DOG THE rdte BROWu vhX (tAaPe ioER THE LAZY e e t et