Refinement of the car radio Toshiba TX-20. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Audio equipment
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The autoradio tape recorder "Toshiba TX-20" purchased by the author was not tuned to many domestic radio stations. Apparently, it was intended for delivery to America or Canada, and the frequency synthesizer step of the receiver was 200 kHz in the VHF band and 10 kHz in the medium wave band.
In Russia, the grid of operating frequencies is different. Processor modes are usually set by applying voltage to its outputs through diodes or jumpers. By turning off the diodes connected directly to the processor, you can change its operating modes. Naturally, this must be done with the power off. After removing the D710 diode (designation on the board), the synthesizer step became equal to 50 kHz in the VHF band (in this radio tape recorder it is with frequencies of 87,5 ... 107,9 MHz) and 9 kHz on medium waves, which corresponds to the standards adopted in our country.
Author: Yu.Klimov, Moscow
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