Page 7 of HAM Radio 2009 by MFJ Enterprises, Inc.

silver plated edge-wound roller inductor .1000/500 pf variable capacitors antenna switch 4-core balun true peak cross-needle swr/wattmeter dummy load extremely wide matching range patent pending the mfj-9982 mfj-9982 continuouscarriertm antenna 95 tuner handles 2500 watts ship code f continuous carrier output on all modes and all hf bands into most unbalanced antennas even on 160 meters where even the best antenna tuners fail the mfj-9982 gives you every feature you ll ever want in a high power tuner -wide matching range 1.8 to 30 mhz coverage 6-position antenna switch 4-core balun dummy load true peak/average lighted swr/wattmeter 6:1 reduction drives with detailed logging scales 3digit turns counter extra large knobs mfj 2500 watts continuouscarriertm tuner 699 the heart and soul of the mfj-9982 is its roller inductor and variable capacitors mfj s high power high-q continuous current aircoretm roller inductor is no ordinary roller inductor it s edge wound from thick .06-inch silver-plated solid copper strap it can carry huge circulating rf currents and withstand tremendous heat that ll melt or burn up ordinary roller inductors self-insulating construction reduces stray capacitance keeps self-resonant frequencies high and out-of-the-way dual silver-plated compression wheels give ultra low-resistance contacts new fast-tune crank knob high-current high-capacitance 1000 pf and 500 pf air variable capacitors have low minimum capacitance and are self-insulating these newly developed capacitors and mfj s patent pending innovation gives you very high efficiency on 160/80 meters and extremely wide matching range on 10/12/15 meters at 2500 watts a feat only the mfj-9982 has achieved new components new technologies the antenna switch is completely isolated to handle high-voltage high impedance antennas high-current low impedance antennas are handled by parallel sets of highcurrent contacts of two ceramic switches powerful balun four 21/2 inch cores 12-gauge teflontm wire run balanced lines at full 2500 watts ssb/cw continuous 24/7 allows massive antenna currents to flow directly to the antenna capacitor without passing though lossy screws or bolts hi-voltage/current antenna switch new 4-core balun new roomy cabinet maintains high q vent holes heavy gauge .08 inch aluminum braced chassis vinyl cover nonstripping pem nuts heavy 10-gauge or copper strap wiring throughout 13¾wx7dx16¼d inches 15 pounds patent pending new cabinet maintains high q new balanced line feed-thru insulator new trueactivetm circuit reads true peak or average power on all modes cross-needle meter reads swr/forward/reflected power 1500 watt air-cooled non-inductive 50 ohm resistor 100w/10 min 1.5kw/10 sec places your rig near earth ground potential mfj-931 trueactivetm peak reading circuit 1500 watt dummy load antenna tuner/artificial ground mfj-934 mfj artificial rf ground ship code b 20995 ship code b 10995 mfj-934 is unique because it has a built-in artificial ground a ground matching knob lets you switch in inductance to bring an attached wire to a low impedance current point to form an artificial ground a push button lets you use the crossneedle meter to monitor for maximum ground current with an artificial ground to work against you ll be surprised to see how well a random wire can work you get a 300 watt full featured antenna tuner that covers 1.8-30 mhz lighted crossneedle meter reads swr/forward reflected power at-a-glance 4:1 balun for balanced lines features efficient airwound inductor high current/voltage 12-position inductor switch and two 1000 volt air-variable capacitors tunes all antennas and feedlines including random wire coax and balanced lines 105/8wx31/2hx8d in create an artificial ground with this mfj-931 it effectively places your rig near actual earth ground potential even if your rig is on the second floor or higher with no earth ground possible it electrically places a far away rf ground at your rig how s your rf ground do you have rf hot spots that bite you when you transmit do you have rf feedback that causes your rig to quit working on some bands do you have tvi/rfi that makes your neighbors hard to live with do you get weak signal reports because of extreme ground losses or radiation pattern distortion these problems could be caused by poor rf grounding especially if your rig is on a second floor with no ground at all even if you have a good ground a long connection wire can ruin its effectiveness by isolating true rf ground from your rig durable four foot copper bonded steel earth ground rod is a mfj-1934 tough 3/8 in diameter that 95 8 will last and last sharp ship code b pointed end makes it easy to drive into the ground use it to tie your equipment to a single earth ground to help bleed off static and rfi and prevent rf hot spots use several to form a good rf ground for random long wire and vertical antennas continued mfj-931 creates an artificial ground it resonates a random length of wire thrown along the floor and produces a tuned counterpoise this artificial ground effectively places your rig near actual earth ground potential with no earth ground possible reduces the electrical length of the ground connection wire to virtually zero by tuning out its reactance mfj-931 connects between your rig and a random length of wire or a connecting ground wire it s tuned for maximum ground current using the built-in rf ammeter 1.8 to 30 mhz 71/2wx31/2 hx7d inches rf tight aluminum cabinet new 4 foot ground rod mfj the world leader in ham radio accessories 7

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