Simple DFT. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Simple DFT. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Filters and matching devices

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A simple transceiver band-pass filter is proposed. A feature of the filter is the use of only two main inductors. The filter circuit is shown in the figure.

Simple DFT. Band pass filter

The capacity data are summarized in the table.

Range, MHz / Parameter	1,9	3,6	7	10	14	18	21	24	28
C2, pF	15300	5900	2100	1300	740	520	410	340	260
С1*, pF	12800	3000	650	320	150	91	68	51	36
Band, kHz	90	170	330	470	660	850	1000	1100	1300
DC1/Df, 50 kHz	1500	150	12

The last column of the table gives an idea of how much you need to change C1 to get the filter circuit frequency to 50 Hz.

Author: N. Smirnov (UA3TW), Nizhny Novgorod; Publication: N. Bolshakov, rf.atnn.ru

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