PDF User Manual for MFJ-989C (MFJ 989 C MFJ989C) : MFJ-989C (MFJ 989 C MFJ989C)
MFJ-989C (MFJ 989 C MFJ989C) technical specifications :
MFJ-989C (MFJ 989 C MFJ989C) technical specifications
MFJ uses super heavy duty components -- roller inductor, variable capacitors, antenna switch and balun -- to build the world's most popular high power antenna tuner. The rugged world famous MFJ-989C handles 3 KW PEP SSB amplifier input power (1500 watts PEP SSB output power). Covers 1.8 to 30 MHz, including MARS and WARC bands.
MFJ's AirCore Roller Inductor, new gear-driven turns counter and weighted spinner knob gives you exact inductance control for absolute minimum SWR.
You can match dipoles, verticals, inverted vees, random wires, beams, mobile whips, shortwave -- nearly any antenna. Use coax or balanced lines. You get everything you've ever wanted in a high power, full featured antenna tuner -- wides matching range, lighted Cross-Needle SWR/Wattmeter, antenna switch, built-in dummy load, balun -- all in a sleek, compact cabinet.
MFJ AirCore Roller Inductor MFJ's exclusive heavy duty AirCore Roller Inductor has an air core that can't burn up! Get ultra high-Q, lowest loss, highest efficiency and highest power handling of any roller inductor in ham radio. MFJ's exclusive Self-Resonance Killer keeps damaging self-resonances away from your operating frequency. Large, self-cleaning wiping contact gives excellent low-resistance connection without contact arcing or burning. Solid 1/4 inch brass shaft, self-align bearings give smooth non-binding rotation.
Competing tuners use a lossy, low Q, solid plastic core with erratic electrical contacts and have potentially damaging self-resonant frequencies. This can cause excessive heating and melt the core!
A new precision gear driven 3-digit turns counter lets you accurately reset your roller inductor for quick band changing. Weighted spinner knob or roller inductor gives you smoother flywheel tuning. Look inside ... You'll see two super heavy duty transmitting variable capacitors that can handle 6000 volts. Extra wide stator plate spacing gives you arc-free operation. Specially shaped plates give low minimum capacitance when unmeshed. this and a hefty 250 pf maximum give you an extremely wide matching range -- even on 160 meters and 10 Meters.
The nearest competing "legal limit" tuner has variable capacitors physically small than MFJ-989C's. Theirs is rated at 4500 volts -- a full 25% less than the MFJ-989C. Theirs is more likely to arc -- not what you want in a "legal limit" tuner! MFJ-989C's super heavy duty antenna switch is made of two individual ceramic wafers wired in parallel. Extra wide spaced heavy duty contacts handle extreme voltages and currents. We've never burned one up!
You can select two coax antennas (directly or through tuner), balanced line/random wire, or built-in dummy load. MFJ's super heavy duty TrueCurrent balun for balanced lines uses two gain 2.5 inch toroid cores. It's wound with Teflon wire connected to high-voltage glazed ceramic feedthrough insulators. The MFJ-989C lets you safely operate high power into balanced feedlines without core saturation or voltage breakdown. Some "legal limit" tuners have inferior voltage baluns with smaller diameter toroid cores and use soft plastic feedthrough insulators that can arc and melt.
A full-size 300 Watt non-inductive 50 Ohm dummy load is built into MFJ-989C. You'll find it handy for transmitter tuning, testing and repairing rigs, setting power level, adjusting mic gain and more. Some "legal limit" tuners don't have a built-in dummy load. They want you to pay for external loads that get in your way.
Lighted Cross-Needle SWR/Wattmeter lets you monitor SWR, forward and reflected power simultaneously. Read both peak and average power in two power ranges. Meter lamp requires 12 VDC or 110 VAC with MFJ-1312D (the MFJ-1312D is a 12 Vcd 500 ma AC Adapter with a 2.1mm jack). The compact MFJ-989C slides right into your operating position -- you'll hardly know it's there.
The MFJ-989 Has a nearly indestructible multi-color Lexan front panel. It's detailed logging scales and legends will be legible for a lifetime of DXing. MFJ-989C uses PEM nuts (not self-tapping screws), wing nut ground post (not a cheap nut), fire-retardant epoxy glass PC board (not canvas based), heavy gauge wire thru-out (not small gauge), locking compound on nuts/bolts (not loose hardware).
Every MFJ-989C is protected by MFJ's famous one year No Matter What limited warranty. We will repair or replace your MFJ-989C (at our option) for a full year.