MFJ-991 / MFJ-994 IntelliTuner Automatic Antenna Tuners
Instruction Manual
©
2004 MFJ Enterprises, Inc.
2
Features
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Automatically matches antennas from 6 to 3200 ohms impedance (MFJ-991); 12 to 800 ohms (MFJ-
994)
•
Handles 150 watts PEP SSB/100 watts CW (MFJ-991); 600 watts PEP SSB/300 watts CW (MFJ-
994)
•
Tune in less than 15 seconds, usually less than 5 seconds
•
Over 1000 non-volatile memories for tuner settings
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Highly efficient switching L-network matching circuit
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1.8 to 30 MHz continuous frequency coverage
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Selectable target SWR 1.5 or 2.0
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Selectable SWR threshold 0.5, 1.0 or 1.5
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Lighted cross-needle SWR/wattmeter with high, low and auto range options
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Built-in frequency counter
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SO-239 coax fed antenna connector
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Connector for random wire or single wire antennas
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Optional remote control
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Optional radio interface for compatible radios
Specifications
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Impedance matching range: 6 to 3200 ohms (MFJ-991); 12 to 800 ohms (MFJ 994)
•
Minimum power for tuning: 5 watts (MFJ-991); 10 watts (MFJ-994)
•
Maximum power while tuning: 100 watts with foldback, 20 watts without foldback
•
RF power limit: 150 watts PEP SSB/100 watts CW (MFJ-991); 600 watts PEP SSB/300 watts CW
(MFJ-994)
•
Frequency range: 1.8 to 30 MHz continuous coverage
•
Frequency counter accuracy: ±1 kHz across HF bands
•
Frequency counter range: up to 50 MHz
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Capacitance range: 0 to 3900 pF (MFJ 991, 256 values); 0 to 2950 pF (MFJ-994, 192 values)
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Inductance range: 0 to 24 µH (MFJ-991, 256 values); 0 to 17 µH (MFJ-994, 192 values)
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Relay rating: 16 amp 1000 volts
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Relay electrical life: 100,000 operations
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Relay mechanical life: 10 million operations
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Memory endurance: 1 million write cycles
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Memory data retention: 100 years
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Power requirements: 12 - 15 volts DC, 2.1 × 5.5 mm coaxial plug, center pin positive
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Current consumption: 1 amp or less
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Dimensions (approx.): 10.1 × 2.8 × 9.2 in. (257 × 71 × 234 mm) (width/height/depth)
not including connectors
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Weight (approx.): 3.7 lb (1.68 kg)
† Specifications and design are subject to change without notice.
Summary of Contents for IntelliTuner -991
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