Sergey, I believe the crystal filter is designed for 150 ohm termination - at least that is the input termination used with the -5dB post mixer amplifier pad, and since the IF filter is symmetrical, its input and output impedances should be the same.
The design point for the variable filter is 400 Hz if I recall correctly, and the capacitance changes to permit different widths. I do not believe the impedance changes a lot over the 1.5kHz to 200 Hz range, so I would assume it is close to 150 ohms. 73, Don W3FPR Sergey Dan wrote: > Hi > How must be K2's variable-bandwidth crystal filter in/out impedance (W2,W3 > points) with > FL1 1.5 CW choosen? > > Thanks in advance > Sergey > 4Z5TV > > ______________________________________________________________ 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
