The MFJ-986 is a Differential-T Tuner that uses a differential capacitor that makes tuning easier than ever. It gives minimum SWR at only one setting. Broadband coverage ends constant re-tuning. The MFJ-986 is a rugged roller inductor antenna tuner that handles 3KW PEP SSB amplifier input power (1500 Watts PEP SSB OUTPUT power). It tunes 1.8 - 30 MHz continuously, including MARS and WARC bands. MFJ's exclusive AirCore Roller Inductor gives absolute minimum SWR -- something tapped inductors just can't do. 3-digit turns counter plus a spinner knob gives precise inductance control so you can quickly retune your frequency. A lighted peak and average reading Cross-Needle meter shows SWR, forward and reflected power at a single glance! The MFJ-1312D power supply or MFJ-5513 cable is required for 12VDC that is needed for metering circuitry.