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MFJ-986 |
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ANTENNA
TUNER, 3 KW, 1.8-30 MHZ, ROLLER, METER,ANT
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MFJs innovative Differential-T Tuner 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.
MFJs exclusive AirCore Roller Inductor gives absolute minimum SWR --
something tapped inductors just cant 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!
You get 6-position antenna switch that lets you select two coax lines
and/or random wires (direct or through tuner), balanced line and
external dummy load. The MFJ TrueCurrentBalun for balanced lines
minimizes feedline radiation that causes field pattern distortion, TVI
and RF in you shack. Ceramic feedthru insulators for balanced lines
withstand high voltages and temperatures.
Replacing two variable capacitors with a single differential capacitor
gives a wide range T-Network tuner with only two controls -- a tuning
capacitor and a roller inductor. Simple 2-knob tuning makes tuning
easier than ever. You get minimum SWR at only one setting a broadband
response that ends constant re-tuning. Youll spend your time QSOing
instead of fooling with your tuner. The compact cabinet has plenty of
room to mount the roller inductor away from metal surfaces for highest Q
-- you get high efficiency and more power into your antenna.
Wide-spaced tuning capacitor plates let you run high power without
arcing. MFJs lighted Cross-Needle Meter shows you SWR, forward and
reflected power simultaneously. It reads peak or average power on 2000
or 200 Watt ranges. The lamp has on/off switch nd uses 12 VDC or 110 VAC
with MFJ-1312D, $14.95.
More tuners use a voltage balun that forces equal voltages on the two
antenna halves. It minimizes unbalanced currents only if the antenna is
perfectly balanced -- not the case with practical antennas. The MFJ-986
uses a true current balun to force equal currents in the two antenna
halves -- even if the antenna is not perfectly balanced! The MFJ
TrueCurrentBalun gives superior balance over voltage baluns and
minimizes unbalanced current. This reduces field pattern distortion,
concentrates your power for a stronger signal plus it reduces TVI and RF
in your shack caused by feedline radiation.
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