Photocoupler
The circuit is basically a system for generating a pulse modulated signal for a Gunn diode microwave oscillator, and various speeds have been set in advance (S3 a and b). The 555 timer is used in conjunction with a divider. It is used to generate Doppler shifts with equivalent values ​​of 25, 35 and 55 miles for X and D-band radars.
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