MFJ-998RT Legal Limit IntelliTuner
TM
Automatic Remote Antenna Tuner Instruction Manual
© 2011 MFJ Enterprises, Inc
MFJ-998RT Version 1A
13
Setup Mode Menus
These instructions require removal of the cover to access. Do not touch the components inside the unit
except for the switches. When testing high RF voltages may be present. Do not leave the cover off for
normal operation.
The setup mode menus allow you to set up how the MFJ-998RT works and behaves. There are 13 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. In addition, the following
setup modes are stored separately for antenna banks 1 and 2: Target SWR, Auto Tune SWR, Amp
Bypass SWR, Meter Range, Peak Hold, Memory, and
IntelliTune
TM
.
Within each setup menu:
•
Press the [MODE] button briefly to cycle forward 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 [ANT] button to cycle backward through the setup menus.
•
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.
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 five watts of RF power. Default is 0.5.
Amp Bypass SWR Menu
Not available in the MFJ-998RT
Meter Range Menu
Not available in the MFJ-998RT
Peak Hold Menu
When the peak hold function is ON, the highest activated segment of the forward bar meter remains
visible for about one second, so that you can more easily read it. When OFF, the meter functions
normally. Default is ON.
Memory Menu
Turns the antenna memory on and off. The “memory resolution” is the width of frequency spectrum that
the tuner recognizes as being the same as a tuned frequency already in memory. The memory resolution
is approximately 0.1 percent of the lower frequency of each amateur band. For example, the memory
resolution on the 40-meter band (7000 to 7300 kHz) is 7 kHz; if the tuner has memorized a setting for
7050 kHz, it will automatically call up this setting for any frequency from 7047 to 7053 kHz. Memory
resolution is smaller at lower frequency to accommodate the higher antenna Q and larger at higher
frequency where the antenna Q is lower. The memory resolutions for the HF amateur bands 160 through
10 meters are:
