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The MFJ-939 automatic antenna tuner is shipped with control cable suitable for various radios of a manufacturer, depending on model. This greatly simplifies the operation, because you need only to press the 'Tune' button on the radio. [1]. The '939' is characterised by a very wide tuning range from 6 to 1600 Ω. This is much more than most internal tuners can offer. The large tuning range is provided by a large number of capacitors and inductivities, which results in a very precise tuning using 256 combinations of C and L each.