On Jun 1, 2010, at 12:47 PM, Kok Chen wrote: > In this case, no matter how clean and clear the signal is, you will always see some error. Notice you can even copy an RTTY signal, but the error rate will be quite high. Oops, that should have been "Notice you can even copy an RTTY signal with a 170 Hz filter, but the error rate will be quite high." 73 Chen, W7AY