A) Variable inductor
NJ2X Notes:
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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.
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| MFJ-989D Antenna Tuner Internal View |
