A method for presetting input bandpass filters. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Filters and matching devices
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The essence of the method is as follows: an amplitude-modulated signal from the GSS through a tunable band-pass filter (BPF) is fed to the amplitude detector and from it to the ultrasonic frequency converter. Thus, it is possible, with sufficient accuracy for amateur radio practice, to quite clearly estimate by ear such parameters as the bandwidth and squareness coefficient Kp. It is convenient to determine Kp at the level of - 6dB, where Um / Uout = 0,5.
If necessary, with the help of the elements included in the Pf, these parameters can be adjusted.
For more accurate tuning, they use the generally accepted method for removing the frequency response, however, as practice has shown, this laborious and painstaking work after tuning in the manner described above is usually not required.
Using this method, it is possible to evaluate the EMF, quartz filters with unknown parameters, which may be at the disposal of radio amateurs. All the "humps" and "hollows" of the frequency response are well heard.
Author: N.Nefedov, Kazakhstan, Aktobe region, Emba; Publication: N. Bolshakov, rf.atnn.ru
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