Principle: The circuit as a whole is a two-stage follower structure. The source follower composed of J310 junction JFET has extremely high input impedance, allowing small-size antennas to obtain better impedance matching. The subsequent transistor follower improves the antenna driving capability. .
Working frequency range: 10khZ~30Mhz
Power supply voltage: 7-12V
Working current: 35mA (8V power supply)
The frequency and gain test results are as follows:
Test instrument: AD9954 frequency sweeper (not connected to the impedance matching circuit), test software: WinNWT4
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