225_Hz_BANDPASS_RTTY

Published:2009/7/3 4:55:00 Author:May | From:SeekIC

Used ahead of Limiter in 170-Hz-shift RTTY receiving converter.Chebyshev mesh configuration with 0.1-dB ripple uses inductor to ground for sharpening lower skirt, with capacitive coupling for sharpening upper skirt, to give good symmetry for response curve. Capacitors should be high-Q ty low in frequency. Insertion loss is 6.6 dB and 3-dB bandwidth is 225 Hz, which makes mark and space tones only 1.5 dB down.-A. J. Klappenberger, A High-Performance RTTY Band-Pass Filter, QST, Jan. 1978, p 33.



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