Ka3jjz

a. MultiPSK -has a USD45 registration fee for some modes, but is a very capable decoder, if you can get past the huge number of menus. Patrick doesn't seem to believe in pull downs...

b. Sigmira - Free, and it will handle Stanag4285 signals (it certainly won't de-crypt the ones that are encrypted, but that's to be expected)

c. Sorcerer Copies tons of modes most other free decoders won't decode

d. PC-ALE - free (available from HFlink.org), and it handles ALE signals. It should be noted that MultiPSK does too, but it's handy to have more than one decoder for a particular mode, and I'll get to why that's true in a moment

e. PC-HFDL- free (available from the HFDL Yahoo group), and it handles HFDL. Again, MultiPSK handles these as well

f. Rivet - free - handles some rather obscure modes, some used by the Russians, others of interest to the folks in the Numbers and Oddities section of the UDXF

g Digtrx - free - MIGHT be useful if you chase numbers stations...

Why overlap the decoders? Simple - one decoder might use a somewhat different algorithm for decoding that works better with your receiver and/or PC. There's no real way of determining this without experimentation.