I have found that at 2400 and 4800 I get between 75 and 95 % first pass rate, as long as it's inverted. 1200 and 300 I may as well give up, and 9600 was only about 50% first pass rate. I'm now using FM modules, which I found to be much cleaner than the AM modules I bought, although I can use both with the program and get the proper data on the screen now...just takes a few seconds longer while I wait for a "good" transmission