toggle quoted messageShow quoted text
With your Raduino running + / - of the crystal filter's center frequency in say 100 Hz step and connecting it to the input of the crystal filter andmeasuring the output of the crystal filter with a RF probe you will be able to plot the actual crystal filter response on the paper. With this plotted
performance you will actually know the center frequency of your crystal filter and also both the total pass bands slopes. Now you can accurately
determine your BFO carrier frequency for allowing correct pass band thru the crystal filter and placing BFO to that frequency.
So a RF probe you should have or construct to help you other than your ears
On Sat, Apr 28, 2018 at 2:19 AM, David Beal <aardvarq@...> wrote: