MFJ-993BRT 300 Watt IntelliTuner
TM
Automatic Remote Antenna Tuner Instruction Manual
© 2011 MFJ Enterprises, Inc
MFJ-993BRT Version 1A
2
Features
• Automatically matches antennas from 6 to 1600 ohms impedance (SWR up to 32:1)
• Handles 300 watts PEP SSB, 150 watts CW
• Tunes in less than 20 seconds, usually less than 5 seconds
• Over 2,000 non-volatile memories for tuner settings
• Highly efficient switched–L network matching circuit
• 1.8 to 30 MHz continuous frequency coverage
• Adjustable target SWR from 1.0 to 2.0
• Adjustable SWR threshold from 0.5 to 1.5
Specifications
• Impedance matching range: 6 to 1600 ohms resistive. The reactive tuning range is a function of
the maximum inductance (24uHy) and maximum capacitance (3900pf) available for a given
frequency or band. The MFJ-993BRT will tune the following end-fed antenna lengths:
o
90-foot or longer antenna on 160 meters
o
25-foot or longer antenna on 80-meters
o
8-foot or longer antenna on 40-10 meters.
Note: The optional MFJ-2904 external inductor extends the MFJ-993BRT tuning range to 160
meters for popular 43-foot verticals.
• SWR matching range: up to 4:1 for < 50 ohms and up to 32:1 for > 50 ohms
• Minimum power for tuning: 5 watts
• Maximum power while tuning: 100 watts with foldback, 20 watts without foldback
• RF power limit: 300 watts PEP SSB, 150 watts CW
• Frequency range: 1.8 to 30 MHz continuous coverage
• Capacitance range: 0 to 3908 pF nominal (256 values)
• Inductance range: 0 to 24.86 µH nominal (256 values)
• Relay contact ratings: 16 amp 1000 volts
• Relay electrical life: 100,000 operations
• Relay mechanical life: 10 million operations
• Memory endurance: 1 million erase/write cycles
• Memory data retention: > 100 years
• Power requirements: 12 - 15 volts DC supplied via MFJ-4117 Bias-Tee on coaxial input
2.1x5.5mm coaxial plug center pin positive
• Current consumption: 1.4 amps or less
• Dimensions (approx.): 10-1/4 × 2-1/2 × 14 in. (261 × 64 × 356 mm) (width/height/depth) including
connectors and mounting brackets
• Weight (approx.): 3.5 lb (1.60 kg)
† Specifications and design are subject to change without notice.
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