MFJ-993 IntelliTuner Automatic Antenna Tuner
Instruction Manual
©
2003-2004 MFJ Enterprises, Inc.
14
Shortcut:
Press both [TUNE] and [C-UP] buttons simultaneously to toggle the target SWR between
1.5 and 2.0, which is indicated by the meter SWR scale. Refer to Table 2 for meter code.
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 5 watts of RF power. Default is 1.0.
Shortcut:
Press both [TUNE] and [L-UP] buttons simultaneously to cycle the auto tune SWR
among 0.5, 1.0 and 1.5. Refer to Table 2 for meter code.
Meter Range Menu
Allows you to select the meter scale range. In the 30 watts (low) range, the 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. Refer to Figure 10 for the on-screen Meter Range indicators. Default is 300 watts range.
Shortcut:
Press both [TUNE] and [C-DN] buttons simultaneously to toggle Auto Range on and off.
Press both [TUNE] and [L-DN] buttons simultaneously to toggle between 300 and 30
watts meter range and disable Auto Range. Refer to Table 2 for meter code.
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. The
memory resolutons 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
two 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. Memory Resolution.
Summary of Contents for MFJ-993
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