MFJ-993B IntelliTuner Automatic Antenna Tuner
Instruction Manual
©
2003-2005 MFJ Enterprises, Inc.
11
The Menus
Main Mode Menus
The main mode menus show various tuner settings and status. There are four main mode menus arranged
in a “wrap-around” structure. When powered on, tuner operation starts with the main menu that was last
used. Within each main menu, press the [MODE] button briefly to view the next main menu. Press and
hold the [MODE] button for two seconds to enter the setup mode (see below). Various tuner indicators
are shown on all four main menus: Antenna 1/2,
IntelliTune
TM
, Memory, Power Level, LC Limit, Meter
Range, Auto/Semi, and
StickyTune
TM
. Refer to Figures 11 and 12 for details on the displayed
information.
Note: In sideband mode, the frequency readout on the tuner display jumps around to different
frequencies while transmitting and stops on another frequency when un-keyed. This is
normal and is a characteristic of sideband mode, because sideband signals jump up and
down in frequency and power.
Note: In bypass mode, the decimal point in the SWR reading is replaced with a comma.
Digital Wattmeter Menu
Shows the frequency, SWR, and forward and reflected power in watts.
Power Bar Meter Menu
Shows the frequency, SWR, forward power, and bar meters for forward and reflected power. The top bar
meter is the forward power and the bottom bar meter is the reflected power. The numeric reading of
forward power appears at the end of the bar meters. A power scale is printed just below the display on the
front panel. Each power bar meter is consisted of 60 bar segments. When in the high power range, each
vertical bar segment consists of three dots. Below 100 watts, each bar segment represents two watts;
above 100 watts, each bar segment represents 20 watts. The forward bar meter has a “peak hold” feature.
The peak meter hold function freezes the highest displayed bar segment of the forward power for about
one second, so that you can more easily read the meter. This function can be turned ON and OFF in the
Peak Hold setup mode.
For low-power tuning, meter range of 30 watts is available. When in the low power range, divide the
readings on the printed power scale by ten and each vertical bar segment consists of two dots. Below 10
watts, each bar segment represents 0.2 watt; above 10 watts, each bar segment represents two watts.
Refer to the “SWR/Wattmeter” section on page 10 for more details on power range.
The power meter can be set to auto range. Auto range automatically sets the meter scale 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. When auto range
is enabled, a two-dot vertical segment appears on the on-screen tuner indicator. Refer to Figures 11 and
12 for the on-screen Range indicator.