MFJ-991B IntelliTuner Automatic Antenna Tuner Instruction Manual
2005-2012 MFJ Enterprises, Inc.
15
Tuner Status Indicators
In addition to displaying power and SWR, the meter also indicates tuner status. The meter needles
bounce, or rise to one point and stay to provide information. In this mode the meters do not indicate
power levels. For example, when you press [C-DN] and [L-DN] simultaneously to place the tuner in
bypass mode, the reflected needle bounces to the 20-watt mark until you release the buttons. The
following tables show the meter needle stationary and bounce codes.
If insufficient power is applied for tuning (less than two watts), the Forward Power needle will bounce to
the 100-watt mark. When input power is too high, the tuner enters a self-protection mode and the
Forward Power meter needle bounces to 300-watt mark (full scale). The tuner will not allow any of its
relays to change to prevent damage to your tuner.
If too much power is applied when tuning is in progress, the tuner will cease the tuning routine, and the
Forward Power meter needle will bounce to full scale. This occurs when the forward power exceeds 75
watts and the SWR is greater than 3.0, or when the forward power exceeds 125 watts regardless of the
SWR. If more than 300 watts (or more than150 watts when 150 watts power level is selected) is applied
to the tuner, the tuner will go into bypass mode; and both Forward and Reflected meter needles will
bounce to full scale.
If the tuner cannot achieve the target SWR, the Reflected Power needle will bounce three times upon
tuning completion.
Meter Needle Stationary Codes
(Meter needles stay at the indicated mark until buttons are released.)
Forward 30 Watts Mark 100 Watts Mark 300 Watts Mark
[TUNE] + [L-DN] 30 Watts Meter Range Auto Range 300 Watts Meter Range
150 Watts Mark 300 Watts Mark
[TUNE] + [C-UP]
+ [L-UP]
Not Used 150 Watts Power Level 300 Watts Power Level
10 Watts Mark 20 Watts Mark 30 Watts Mark 40 Watts Mark
[TUNE] + [C-DN] Memory Bank A Memory Bank B Memory Bank C Memory Bank D
Reflected 5 Watts Mark 20 Watts Mark 60 Watts Mark
[TUNE] + [L-UP] Auto Tune SWR +0.5 Auto Tune SWR +1.0 Auto Tune SWR +1.5
[TUNE] 2 seconds Sticky Tune Off Not Used Sticky Tune On
Both Needles Zero Scale Mid Scale Full Scale
[L-UP] or [C-UP] No (Cancel) Delete Confirmation? Yes (Delete)
[TUNE] + [C-DN]
+ [L-DN]
Not Used Not Used Memory Overwrite
Needles Intersect at SWR 1.5 Needles Intersect at SWR 2.0
[TUNE] + [C-UP] Target SWR 1.5 Target SWR 2.0
Table 2. Meter Needle Stationary Codes.
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