As I wrote in my last message, on K2 #4334 I was not able to calibrate the narrow filters on RTTY normal to center high tones (about 2.2KHz): I reach about 1.6KHz and then the BFO resets to the intial frequency. It happened only on RTTY normal (LSB), on RTTY reverse (USB) I was able to calibrate correctly the filters to match the 2125/2295Hz tones. During the BFO calibration, I had to add 68pF and 100pF in parallel with C174 and C173 to have the correct BFO range (4916.77 KHz - 4912.59 KHz), do you think that I can't calibrate the filters because the BFO limits are not yet enough (too high or too low)? Any suggestion? Thanks and 73 Ciao Guido, ik2bcp
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