> 2) The IIR filters have slightly steeper skirts, but ring more. The FIR > filters ring less but are not quite as sharp.
I believe the IIR filters ring more BECAUSE they have steeper skirts. As I explained in a previous message, FIR and IIR filters have similar ringing characteristics if the bandwidth and shape factors are the same. Al N1AL On Thu, 2008-07-24 at 11:25, Vic K2VCO wrote: > KB5DXY wrote: > > > How about a discussion of what these filters actually do for you and why you > > might want to use each one. > > Here is the most practical possible explanation: > > 1) We are talking about the narrowest filters, 50-100 Hz. So this is > only applicable to CW. > > 2) The IIR filters have slightly steeper skirts, but ring more. The FIR > filters ring less but are not quite as sharp. > > 3) Find a very weak CW signal that you can barely copy and see which > makes it easier to copy. > > Note: it will depend on band conditions; different types of QRN may make > one type of filter better than another. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
