FCC Technician Exam Question Of The Day (T6C10)
A) Variable inductor
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Below is a picture of the internals of the MFJ-989D ANTENNA TUNER, 1.8-30 MHZ, LEGAL POWER. Notice the large variable roller inductor pictured at the bottom. The knob for changing the inductuctance is just visable on the left.
|MFJ-989D Antenna Tuner Internal View|