FSK might not have "excess" bandwidth, but AFSK can have narrower bandwidth.
http://www.frontiernet.net/~aflowers/k3rtty/k3rtty.html#K3_AFSK_filter On 3/24/2014 5:27 AM, Barry wrote:
Fred, If set correctly, there's no difference. However, FSK is foolproof. It can't be overdriven with excessive audio input resulting in excess bandwidth and spurs. Some of it is historical, as in some older radios, narrow filters cannot be used in AFSK mode. Barry w2UP
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