MFJ-993B IntelliTuner Automatic Antenna Tuner Instruction Manual
2005-2012 MFJ Enterprises, Inc.
26
Appendices
POWER-ON OPERATIONS
(Press and hold buttons while turning on the power.)
Press and hold + + to calibrate the SWR bridge.
Press and hold + to start the self test.
Press and hold + + to reset factory defaults.
TUNE L-DN
Press and hold + + to calibrate the wattmeter.
Press and hold + + + to delete the selected antenna memory.
TUNE ANTC-DN
Press and hold + + + to perform total reset.
TUNE C-DN L-DN
C-UP
Press and hold + to get the firmware version number.
C-DN
Press and hold + to test the relays.
L-DNL-UP
Press and hold + + to calibrate the frequency counter.
L-DN
Press and hold + to test the power-down circuitry.
POWER
POWER
POWER
POWER
POWER
POWER
POWER
POWER
POWER
Press and hold + + to output audio for volume adjustment.
POWER
L-UPC-UP
L-UP
C-UP C-DN
C-DN L-DN
POWER
Figure 15. Power-On Operations.
Important: The radio interface cable must be disconnected from the tuner, if the radio power is
off, before performing any of the following power-on operations.
Resetting the Tuner
Each time the tuner is powered off, the microprocessor saves all memories and configurations to non-
volatile memory. When the power is off, the tuner is bypassed (straight through from TRANSMITTER
to ANTENNA 1 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. If the tuner is not working properly, even on initial
power on, try resetting to the factory defaults.
Factory Defaults
The unit is shipped with the following default settings for both antennas:
• Main Menu Digital Wattmeter
• Setup Menu Target SWR
• Inductance 0 μH
• Capacitance 0 pF on transmitter side
• Power Level 300 watts †
• Target SWR 1.5 †
• Auto Tune SWR 0.5 above target SWR †
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