MFJ-994B IntelliTuner Automatic Antenna Tuner Instruction Manual
© 2004-2010 MFJ Enterprises, Inc.
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• POWER Button: Used to turn the power on and off. Note that during power-on the analog meter
bounces four times to indicate the model 994. When the power is off, the tuner is bypassed (straight
through from TRANSMITTER to ANTENNA and WIRE). When power is turned on, the tuner
powers-up bypassed, but will revert to the last stored matching values or begin tuning on application
of RF power when the TUNE button is pressed – or if Automatic or Sticky-Tune is enabled.
WARNING: Do not turn the power on and off rapidly, otherwise the tuning setting
memory can be corrupted and the unit will have to be reset to factory defaults.
BUTTON ACTION
TUNE C-UP
L-UPTUNE
TUNE L-DN
TUNE C-DN
C-DN L-DN
C-UP C-DN
Press + to switch the capacitor between the input and output side.
Press + to bypass the antenna tuner.
Press + to cycle the Auto Tune SWR among 0.5, 1.0 and 1.5 above the target SWR.
Press + to toggle the Target SWR between 1.5 and 2.0.
Press + to cycle the Memory among banks A, B, C and D.
Press + to cycle the Meter Range among 300 watts, 3000 watts and auto range.
Press + to increase both capacitance and inductance.
C-UP L-UP
AUTO
C-UP
L-UP
C-DN
L-DN
TUNE
POWER
Press in to select semi-automatic mode, out to select automatic mode.
Press to decrease inductance.
Press to increase inductance.
Press to decrease capacitance.
Press to increase capacitance.
Press in to turn power on, out to turn power off.
Press less than 0.5 second to bypass the tuner; press and hold for 0.5 to 2 seconds to start the
tuning process; press and hold for more than two seconds to toggle the StickyTune on and off.
Press + to overwrite tuner memory with the current tuner setting.+
TUNE L-DNC-DN
Figure 3. Button Action.
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