MFJ-993B IntelliTuner Automatic Antenna Tuner
Instruction Manual
2005-2012 MFJ Enterprises, Inc.
2
The MFJ-993B tuner enters a “sleep” mode when idle and when no transmit signal is present, turning off
the microprocessor clock to avoid the generation of spurious signals.
Features
•
Automatically matches antennas with impedances of 6 to 1600 ohms or 6 to 3200 ohms
•
Handles 300 watts (match 6 to 1600 ohms) or 150 watts (match 6 to 3200 ohms)
•
Tunes in less than 15 seconds, usually less than 5 seconds
•
Over 20,000 non-volatile memories for tuner settings
•
Four memory banks per antenna with over 2500 memories per bank
•
Highly efficient switching L-network matching circuit
•
1.8 to 30 MHz continuous frequency coverage
•
Adjustable target SWR 1.0 to 2.0 (default is 1.5)
•
Adjustable SWR threshold 0.5 to 1.5 (default is 0.5 above target SWR)
•
Lighted cross-needle SWR/wattmeter with high, low, and auto range options
•
Multifunction backlit LCD display with contrast control
•
Numeric readings for SWR, forward and reflected power
•
Bar meters for SWR, forward and reflected power with range options
•
Audio SWR meter with volume control
•
Built-in frequency counter for remembering frequency-specific matching values
•
Two SO-239 coax fed antenna connectors
•
Connector for random wire or single wire antennas
•
Built-in 4:1 current balun for balanced line antennas
•
Optional remote control
•
Optional radio interface cables for compatible radios
Specifications
•
Impedance matching range
: 6 to 1600 ohms (300 watts) or 6 to 3200 ohms (150 watts)
•
SWR matching range
: Up to 8:1 for < 50 ohms and up to 32:1 for >50 ohms (300 watts)
Up to 8:1 for < 50 ohms and up to 64:1 for >50 ohms (150 watts)
•
Minimum power for tuning
: 2 watts (optimum SWR tuning accuracy occurs at 10-20 watts)
•
Maximum power while tuning
: 100 watts with foldback, 20 watts without foldback
•
RF power limit
: 300 watts SSB/CW
•
Frequency range
: 1.8 to 30 MHz continuous coverage
•
Frequency counter accuracy
: ±1 kHz across HF bands
•
Capacitance range
: 0 to 3908 pF nominal (256 values)
•
Inductance range
: 0 to 24.86
μ
H nominal (256 values)
•
Relay rating
: 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
: > 200 years
•
Power supply requirements
: 12 - 15 volts DC
•
Current consumption
: 1 amp or less
•
Dimensions (connectors not incl.) : 10.1 × 2.8 × 9.2 in; 257 × 71 × 234 mm (w × h × d)
•
Weight
: Approx. 3.9 lb; 1.77 kg
† Specifications and design are subject to change without notice.
