The signal from the triple band pass filter is converted into the first lF signal of 17.2MHz. The signal from Q1 is led to the triple band pass filter (L4, L5, L6), and gets the high image rejection ratio. The voltage of the gate 2 is set higher to get the high gain and sensitivity. D19 is the diode limiter circuit against the excessive input power of more than 20dBm. The signal from L14 is led to the gate of Q1.
The signal from the antenna is passed through a low-pass filter and input to the voltage step up circuit consisting Of L14. Transistor, Diode and LED Outline Drawings
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