MFJ-993B IntelliTuner Automatic Antenna Tuner
Instruction Manual
©
2003-2005 MFJ Enterprises, Inc.
17
for Antenna 1 and Antenna 2 (settings for balanced line or single-wire antenna are stored as Antenna 1).
This provides memory for up to eight different antennas. Refer to Figures 11 and 12 for the on-screen
Memory indicator. Defaults are memory banks 1A and 2A ON.
Shortcut:
Press both [TUNE] and [C-DN] buttons simultaneously to turn on the antenna memory
and to cycle the memory banks A, B, C and D. Refer to Table 2 for meter code.
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 [C-DN] 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], [L-DN] and [C-DN] 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 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. Refer to Figures 11 and
12 for the on-screen
IntelliTune
TM
indicator. 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.
Shortcut:
Press both [L-UP] and [L-DN] buttons simultaneously to toggle SWR Beep on and 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. Default is OFF.
Note: Refresh slows tuning progress as it takes time to update the display.