Select your language

We offer a simple the bandpass filter of the transceiver. Feature filter is the use of only two main inductors. The filter circuit shown in the figure.

These vessels are summarized in the table.

Range, MHz
/
Option
1,9 3,6 7 10 14 18 21 24 28 C2, pF 15300 5900 2100 1300 740 520 410 340 260 C1*, pF 12800 3000 650 320 150 91 68 51 36 Bandwidth, 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 the frequency of the loop filter at 50 Hz.

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