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Measuring filter shape factor
Good web page.....................I throw them on a network analyzer when I
want to measure them, but there are some pretty good ideas here. Pete "mike maghakian" wrote in message ... check this page out: http://www.radio-electronics.com/inf...electivity.php "Michael Thorpe" wrote in message news:43c4e407.4277000@news-server... Amongst all these political propaganda posts, I wonder if there is a little room for a technical question related to radio please? If so, here goes: How does one measure the IF filter shape factor in a shortwave radio? I am technically minded and do have a signal generator, etc., but I am not sure of the exact procedure. Do I get the audio level at the peak frequency, then detune both sides off the peak for -3dB of the demodulated audio, note down the width between these points, then detune to obtain for -50dB of the demodulated audio, get the width at these points, and then the ratio of the two widths is the filter shape factor? I would appreciate a link to the exact procedure if there is one (don't seem to be able to find this in Google) or an expert advice please. I would also appreciate advice as to what actual values of filter shape are considered poor, good, excellent, etc... Thanks in advance, Michael |
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