I don't have a KAF2 Hisashi-san. Of course, they are both active filters but, from the comments I've noted here on the reflector, it sounds as if the AF1 is more "aggressive" than the KAF2.
The AF1 is predominately a narrow bandpass filter but it also has a low-pass filter section to roll off the higher frequencies. You can see typical plots of the bandpass characteristic in the AF1 manual available on the Elecraft web site (look under Manuals and Downloads/Mini-Modules/AF1 Audio Filter). I can say the AF1 behaves very much like most active filters I've used with about all the selectivity possible (in BPF2 position) without serious "ringing". The AF1 is also tunable from the front panel to match your audio frequency preference. Also, the high-frequency cutoff point of the low-pass filter is adjustable from the front panel and it has a front-panel audio gain control. Ron AC7AC -----Original Message----- I wasn't paying enough attention lately. Does anyone have a comparison of the audio filter in the AF-1 vs the one in the KAF2? I've wanted a low pass filter for a while, and after seeing a youtube video of the AF-1 I think that's what I'm looking for. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
