MFJ MFJ-993, Instruction Manual

MFJ-993 IntelliTuner Automatic Antenna Tuner 

Instruction Manual 

©

 2003-2004 MFJ Enterprises, Inc. 

13

Tuner Indicators 

 
Various tuner indicators are shown on the main menus to indicate tuner status.  Refer to Figure 10 for 
locations of these indicators. 

• 

Antenna:

  A small “1” appears to indicate antenna 1 is selected; a small “2” appears to indicate 

antenna 2 is selected. 

• 

Memory:

  When Memory is ON, a bar appears on top-left of the Antenna indicator. 

• 

IntelliTune:

  When IntelliTune

TM

 is ON, a bar appears on top-right of the Antenna indicator. 

• 

Auto/Semi:

  A small “S” appears to indicate semi-automatic mode; nothing appears to indicate 

automatic mode. 

• 

StickyTune:

  When StickyTune is ON, a bar appears on top of the Auto/Semi indicator. 

• 

SWR Beep:

  When SWR Beep is ON, a musical note 

♪

 appears. 

• 

LC Limit:

  When LC Limit is OFF, a two-dot vertical bar segment appears on the upper left corner 

of the SWR Beep indicator. 

• 

Meter Range:

  When Auto Range is ON, a two-dot vertical bar segment appears on the lower right 

corner of the SWR Beep indicator.  Another dot appears on top of this bar segment when the meter 
range is high, and no dot when the meter range is low. 

Setup Mode Menus 

 
The setup mode menus allow you to set up how the MFJ-993 works and behaves.  There are ten 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. 
 
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. 

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.