Output audio amplifier (fig. 6) is made of TDA7050. Circuit is conventional, working from Ucc=3V. Be sure than both wires to loudspeker are isolated from GND. The 64MHz oscillator (second heterodyne) is made using harmonic frequency of crystal (fig. 7). The crystal works on 5-th overtone. Parallel LC circuit in collector of transistor, we adjust for maximum output signal 64MHz. Sine signal 64MHz goes to lower gates of FETs in each of 3 branches of correlators (fig. 3).
umts