Intermediate frequency selection. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Miscellaneous electronic devices

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In the article by R. Medvedev "How to choose the conversion frequency?" ("Radio", 1979, N8, pp. 22-23) formulas are given that make it possible to identify affected points within the operating frequency range of the transceiver equipment. The results of IF calculations up to 10 MHz with one frequency conversion for all KB bands allocated to radio amateurs and the 1,8 MHz band are given in the table published here. Calculations (step 10 kHz) were performed on a computer.

If it is intended to use an intermediate frequency close to the 7 MHz range, special measures must be taken in the transceiver to suppress the spurious receive and transmit channel on the IF over the entire bandwidth of the IF path. These include the complete shielding of the intermediate frequency path (especially its input), the installation of notch filters and plug filters, the use of balanced mixers, the inclusion of a circuit between the nodes and the body of the device (places are determined experimentally) consisting of a tuning capacitor and a quartz resonator for the frequency of the IF .

The most expensive, but also the most effective means of protection is a quartz filter, which is switched on at the input of the receiver and immediately after the mixer.

Author: V. Besedin (UA9LAQ), Tyumen; Publication: N. Bolshakov, rf.atnn.ru

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