On Sun, 29 Apr 2007, Alexander S. Yurkov wrote: > I can not easy remember general (without narrow band approximation) form > of LPF to BPF transformation but shure it is posible and yelds > some asymmetry in BPF response. Though somone similar to \omega'=a*\omega + b/\omega with constant a and b. This is NONLINEAR transformation which yelds some distortion of response. 73 de RA9MB/Alex http://www.qsl.net/ra9mb