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Using the Zener breakdown characteristics of the Zener diode, a high-frequency signal with a frequency of several hundred megahertz can be obtained. The circuit is shown in the figure. The signal taken from output V01 is a single frequency signal that can be used to align the resonant frequency in the tuned loop. The signal taken out from the output V02 is a broad-spectrum high-frequency signal, and the tuning between the input resonant circuit and the local oscillator tuning circuit in the superheterodyne radio can be performed. The frequency range of the generator is from l00 kHz to 27 MHz, and is divided into five frequency bands of 100 kHz to 300 kHz to 1 MHz to 3 MHz to 9 MHz to 27 MHz. The output voltage of the signal generator is approximately 9mV. The coils L1 to L5 are wound on a skeleton having a fine-tuning magnetic core, L1 to L3 are made of Φ0.1 mm enameled wires, and L4 and L5 are made of Φ0.2 mm enameled wires. The number of turns of L1 to L5 is 270+270, 260, 80, 30 and 10åŒ. After assembly, calibrate with a standard signal generator and make a frequency scale on the knob of variable capacitor C3. Adjusting the potentiometer RP makes the output high frequency signal strongest. There is no special requirement for the voltage regulator used in the circuit, except that the power supply voltage should be higher than the regulation voltage to ensure that the Zener diode works at the inflection point of the characteristic curve.
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