MFJ-998RT Legal Limit IntelliTuner
TM
Automatic Remote Antenna Tuner Instruction Manual
© 2011 MFJ Enterprises, Inc
MFJ-998RT Version 1A
14
Meter
Frequency Range (MHz)
Memory Resolution
160
1.800-2.000
2
75/80
3.500-4.000
4
60
5.3305, 5.3465, 5.3665, 5.3715, and 5.4035
5 memory locations
40
7.000-7.300
7
30
10.100-10.150
10
20
14.000-14.350
14
17
18.068-18.168
18
15
21.000-21.450
21
12
24.890-24.990
25
10
28.000-29.700
28
Figure 8 Tuning Window Resolution Chart
The memory resolution for non-amateur frequency bands between 160 and 10 meters is approximately
0.2 percent of the lower frequency of each band. There are over 2500 memory locations for each memory
bank, and each antenna bank has four memory banks (A-D).
Tuner settings are stored in memory separately for Antenna bank 1 and Antenna bank 2. This provides
memory for up to eight different antennas. Refer to Figures 15 and 16 for the on-screen Memory
indicator. Defaults are memory banks 1A and 2A ON. To clear an antenna memory bank, select the
antenna memory bank with the [ANT] button, turn off the power to the tuner, then press and hold both
[TUNE] and [C-UP] buttons while turning on the power. A DELETE BANK message will appear. To clear
the memory for an antenna (all four banks), select the antenna with the [ANT] button, turn off the power to
the tuner, then press and hold both [TUNE] and [ANT] buttons while turning on the power. A DELETE
ANTENNA message will appear. “Total Reset” erases both antenna memories and returns all tuner
settings to their factory default states. To achieve this, turn power off, press and hold [TUNE], [C-UP] and
[L-UP] buttons while turning on the power. A TOTAL RESET message will appear.
Note: Pressing [TUNE], [C-DN] and [L-DN] buttons simultaneously overwrites the tuner memory with the
current tuner setting; settings with SWR greater than 3.0 will not be stored.
IntelliTune
TM
Menu
Turns the IntelliTune
TM
tuning algorithm on and off. When the tuner cannot find an appropriate setting in
its memory, it begins its calculation function. It measures the complex impedance of the antenna (load) at
the transmitting frequency, then it calculates the L/C components needed for a match. Then it fine-tunes
the component values. If for any reason the tuner cannot calculate the load impedance, it proceeds to yet
another method of calculation. If for any reason, this function can be turned off. Default is ON.
SWR Beep Menu
Turns the audio SWR meter on and off. The audio meter is a series of beeps where one beep indicates
SWR of 1.5 or less, two beeps indicate SWR of 1.6 to 2.0, three beeps indicate SWR of 2.1 to 2.5, and
four beeps indicate SWR of 2.6 to 3.0. For SWR above 3.0, “SWR” (di-di-dit di-dah-dah di-dah-dit) will be
sent on CW. This functions independent of the acknowledgement beep setting. Default is OFF.
Beep Menu
Acknowledgement beep sounds each time a parameter is changed to acknowledge it. This also controls
the CW notification of “QRO”, “QRP” and “QRT”. This function can be turned OFF for silent operation, and
this is independent of the SWR beep setting. Default is ON.
Refresh Menu
When the refresh function is ON, the display is updated while tuning is in progress. Because the display is
not available for remote operation it is recommended that it is left off for quicker tuning. Default is OFF.
