I use FIR but both types do it. 73, Gary W7TEA Hi Gary, which DSP filter type do have activated for the narrowest bandwidths? Do both types (FIR & IIR) do this? vy 73 de toby -- View this message in context: http://n2.nabble.com/v2.32-Beta-and-DSP-filtering-tp792402p792523.html Sent from the Elecraft mailing list archive at Nabble.com.