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MFJ-994B IntelliTuner Automatic Antenna Tuner Instruction Manual

The MFJ-994B 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 from 12 to 800 ohms impedance

• Handles 600 watts PEP SSB/600 watts CW/500 watts constant carrier

• Tunes in less than 15 seconds, usually less than 5 seconds

• Over 10,000 non-volatile memories for tuner settings

• Four memory banks with over 2500 memories per bank

• Highly efficient switching L-network matching circuit

• 1.8 to 30 MHz continuous frequency coverage

• Selectable target SWR 1.5 or 2.0 (default is 1.5)

• Selectable SWR threshold 0.5, 1.0 or 1.5 (default is 0.5 above target SWR)

• Lighted cross-needle SWR/wattmeter with high, low and auto range options

• Built-in frequency counter for remembering frequency-specific matching values

• SO-239 coax fed antenna connector

• Connector for random wire or single wire antennas

• Optional remote control

• Optional radio interface cables for compatible radios

Specifications

• Impedance matching range : 12 to 800 ohms

• SWR matching range : Up to 4:1 for < 50 ohms and up to 16:1 for > 50 ohms

• 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 : 600 watts PEP SSB/600 watts CW/500 watts constant carrier

• Frequency range : 1.8 to 30 MHz continuous coverage

• Frequency counter accuracy : ±1 kHz across HF bands

• Capacitance range : 0 to 2950 pF (192 values)

• Inductance range : 0 to 17 μH (192 values)

• Relay rating : 16 amp 1000 volts

• Relay electrical life : 100,000 operations

• Relay mechanical life : 10 million operations

• Memory endurance : 1 million write cycles

• Memory data retention : > 200 years

• Power requirements : 12 - 15 volts DC

• Current consumption : 850 mA or less

• Dimensions (connectors not incl.) : 10.1 × 2.8 × 9.2 in; 257 × 71 × 234 mm (w × h × d)

• Weight : Approx. 3.7 lb; 1.68 kg

† Specifications and design are subject to change without notice.

MFJ IntelliTuner MFJ-994B User Manual

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