MFJ-998 Legal Limit IntelliTuner Automatic Antenna Tuner
Instruction Manual
©
2007-2010 MFJ Enterprises, Inc.
15
For low-power tuning, meter range of 300 watts is available. When in the low power range, each vertical
bar segment consists of two dots. Below 100 watts, each bar segment represents two watts; above 100
watts, each bar segment represents 20 watts. Refer to the “SWR/Wattmeter” section on page 13 for more
details on power range.
The power meter default condition is auto range. Auto range automatically sets the meter scale according
to the input RF power to the tuner. Forward power greater than 300 watts or reflected power greater than
60 watts automatically sets the meter to the high power range. Forward power less than 250 watts and
reflected power less than 40 watts automatically set the meter to the low power range. When auto range
is on, a two-dot vertical segment appears on the on-screen tuner indicator. Refer to Figures 16 and 17 for
the on-screen Auto Range indicator.
0
25
50
75
100
PWR
300
Multiple scale
by 10
Figure 13. Power Bar Meter (High Range).
0
25
50
75
100
PWR
300
Figure 14. Power Bar Meter (Low Range).
SWR Bar Meter Menu
Shows the frequency, SWR, forward power, and SWR bar meter. A SWR scale is printed just below the
display on the front panel. The 12-block (31-segment) SWR bar meter indicates SWR of 1.0, 1.1, 1.2,
1.3, 1.4, 1.5, 1.6-1.7, 1.8-2.0, 2.1-2.5, 2.6-3.0, 3.1-5.0, 5.1 to infinity. The numeric reading of forward
power appears at the end of the bar meter. There is also an audio SWR indicator (see “SWR Beep Menu”
section on page 20).
1
1.2
1.5
2
3
SWR
Figure 15. SWR Bar Meter.
L-Network Menu
Shows the configuration of the L-network matching circuit, SWR, and forward power. The antenna
symbol, on the upper left corner, indicates the antenna side of the L-network. The capacitance value is
displayed to the left when it is on the antenna side and to the right when it is on the transmitter side.
Inductance value is shown in microhenries (
μ
H) and capacitance value in picofarads (pF). The numeric
reading of forward power appears at the lower right corner of the display. See “Manual Tuning” on page
21.