MFJ-991B IntelliTuner Automatic Antenna Tuner Instruction Manual
2005-2012 MFJ Enterprises, Inc.
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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. The memory resolutions for the HF amateur bands 160
through 10 meters are:
Meter Frequency Range (kHz) Memory Resolution (kHz)
160 1800 – 2000 2
75/80 3500 – 4000 4
60 5330.5, 5346.5, 5366.5, 5371.5 and 5403.5 5 memory locations
40 7000 – 7300 7
30 10100 – 10150 10
20 14000 – 14350 14
17 18068 – 18168 18
15 21000 – 21450 21
12 24890 – 24990 25
10 28000 – 29700 28
Table 1. Antenna Memory Resolution.
The memory resolution for non-amateur frequency bands between 160 and 10 meters is approximately
0.2 percent of the lower frequency of that band. There are over 2500 memory locations for each of the
four memory banks (A-D). This provides memory for up to four different antennas. Default is memory
bank A. Press both [TUNE] and [C-DN] buttons simultaneously to cycle the memory banks A, B, C and
D (Forward Power meter needle reads 10, 20, 30 and 40 watts, respectively).
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.
To clear the antenna memory, turn off the power to the tuner. Then press and hold both [TUNE] and [C-
DN] buttons while turning on the power. Both meter needles will read half scale, forming a triangle,
asking you to confirm the deletion. Press [C-UP] to confirm delete (both meter needles will read full
scale), or press [L-UP] to cancel the antenna memory delete (both meter needles will read zero).
“Total Reset” erases the antenna memory and returns all tuner settings to their factory default states. To
achieve this, turn power off, press and hold [TUNE], [L-DN] and [C-DN] while turning on the power.
Both meter needles will read half scale. Press [C-UP] to confirm total reset (needles go to full scale) or
press [L-UP] to cancel total reset (needles go to zero).
Meter Range
You can select a meter scale range or use auto range. In the 30 watts (low) range, forward full scale is 30
watts and the reflected full scale is 6 watts (divide the meter reading by 10). In the 300 watts (high)
range, the forward full scale is 300 watts and the reflected full scale is 60 watts. Auto range automatically
sets the meter scales according to the input RF power to the tuner. Forward power greater than 30 watts
or reflected power greater than six watts automatically sets the meter to the high power range. Forward
power less than 25 watts and reflected power less than four watts automatically set the meter to the low
power range. Default is the 300-watt range.
Press both [TUNE] and [L-DN] buttons simultaneously to cycle the meter range among 30 watts, 300
watts and auto range (Forward Power meter needle reads 30, 300 and 100 watts, respectively).
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