MFJ IntelliTuner MFJ-993B, Instruction Manual, Page: 21 / 40

MFJ-993B IntelliTuner Automatic Antenna Tuner Instruction Manual
©
2003-2005 MFJ Enterprises, Inc.
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Setup Mode Menus
The setup mode menus allow you to set up how the MFJ-993B works and behaves. There are 11 setup
mode menus arranged in a “wrap-around” structure. To access these setup menus, press and hold the
[MODE] button for two seconds. The setup menu that will display is the one that was last used. When
finished, press the [MODE] button for two seconds to go back to the main mode for normal operation.
The tuner goes into protective bypass mode in the setup mode and restores the matching network after
exiting the setup mode. If no button is pressed for more than eight seconds, the tuner automatically exits
the setup mode, restores the matching network, and returns to the main mode.
To access the LC Limit setup menu from any setup menu, press and hold the [MODE] button and within
two seconds press both [C-UP] and [L-UP] buttons. This difficulty is built-in so the LC Limit is not
accidentally disabled. Notice the LC Limit is not saved into non-volatile memory and will revert back to
default ON when power is turned off.
The following setup modes are stored separately for antennas 1 and 2: Power Level, Target SWR, Auto
Tune SWR, Meter Range, Peak Hold, Memory, and
IntelliTune
TM
.
Within each setup menu:
•
Press the [MODE] button briefly to cycle through the setup menus; press and hold the [MODE]
button for two seconds to exit the setup mode and go back to the main mode.
•
Press the [C-UP] or [L-UP] button to increase or turn on the setting for the current setup menu.
•
Press the [C-DN] or [L-DN] button to decrease or turn off the setting for the current setup menu.
Power Level Menu
Allows you to set the maximum power level the MFJ-993B can handle to 300 watts or 150 watts
SSB/CW. Power level of 300 watts can match antennas with impedances of 6 to 1600 ohms; power level
of 150 watts can match a wider impedance range of 6 to 3200 ohms. Default is 300 watts.
Shortcut:
Press [TUNE], [C-UP] and [L-UP] buttons simultaneously to toggle the power level
between 300 and 150 watts. Refer to Table 2 for meter code.
Target SWR Menu
Allows you to set the target SWR from 1.0 to 2.0. The tuning process will stop when a match with an
SWR less than or equal to the target SWR is found. Setting the target SWR lower than 1.5 may require
longer tuning times. The target SWR is shown on the initial display when the tuner is powered on.
Default is 1.5.
Shortcut:
Press both [TUNE] and [C-UP] buttons simultaneously to toggle the target SWR between
1.5 and 2.0, which is indicated by the meter SWR scale. Refer to Table 2 for meter code.
Auto Tune SWR Menu
Allows you to set the SWR threshold in the range 0.5 to 1.5. In the automatic mode, the tuning process
will automatically start when the SWR is above the target SWR by this amount of SWR threshold. For
example, for target SWR of 1.5 and auto tune SWR of 1.0, the tuning process will start whenever the
SWR is above 2.5 (1.5 + 1.0) and there is at least 2 watts of RF power. Default is 1.0.