MFJ-994 (MFJ 994 MFJ994) automatic antenna tuner

   
 
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18 September 2021, 23:33 UTC 


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MFJ-994 (MFJ 994 MFJ994)
MFJ-994
PDF User Manual for MFJ-994 (MFJ 994 MFJ994) :  MFJ-994 (MFJ 994 MFJ994) Instruction Manual

MFJ-994 (MFJ 994 MFJ994) technical specifications :  MFJ-994 (MFJ 994 MFJ994) technical specifications
The MFJ-994 IntelliTuner™ let you rapidly tune antennas automatically: unbalanced or single-wire (or balanced, with an external balun). MFJ's exclusive InstantRecall™, IntelliTune™ and AdaptiveSearch™ algorithms give you fast automatic tuning with more than 1000 non-volatile memories.



The tuner includes a highly efficient switching L-network with wide matching capability, 1.8 to 30 MHz coverage, cross-needle power meters, a port for an accessory remote control, a radio interface port, and heavy-duty 16 amp/1000 volt relays. It is rated at 600 watts PEP SSB and 300 watts CW.

192 values of capacitance and 192 values of inductance are available. With the inductance switched between the input and output side, this provides a total of 73,728 L/C tuning combinations. The nominal tuning ranges are 0 to 2950 pF and 0 to 17 µH.

All MFJ IntelliTuners™ learn and remember. When you transmit, they automatically adjust for minimum SWR and remember the frequency and tuner settings, safely stored in non-volatile memory. The next time you operate on that frequency (or close to it), these tuner settings are instantly restored and you’re ready to operate in milliseconds. The tuner can learn and remember more than a thousand frequencies and tuner settings.

When you key your transmitter, MFJ’s InstantRecall™ checks its memory to see if you have operated that frequency before. If so, tuning is instantaneous and you’re ready to operate. If not, MFJ’s IntelliTune™ algorithm (based on MFJ’s famous SWR Analyzer technology) kicks in. It measures the complex impedance of your antenna. Next, it calculates the components it needs and instantly snaps them in. Finally, it fine-tunes to minimize SWR, and you’re ready to operate – all in a fraction of a second.

If the antenna impedance is not within the tuner’s measurement range, MFJ’s AdaptiveSearch™ algorithm goes into action. Frequency is measured and relevant component values are determined. Only those values are searched for fast tuning. If it still cannot find a match, the search is performed again using a different search pattern.

The target SWR can be set at 1.5 or 2.0. The minimum power to tune is approximately ten watts. You can manually tune where you can’t transmit (for listening out of ham bands). The optional MFJ-993RC (this is a remote control that can be used for MFJ's line of IntelliTuner™ Automatic Antenna Tuners) Remote Control provides most tuner controls, allowing convenient remote locating of the tuner itself.

All MFJ’s IntelliTuners™ support radio tuner interfaces that are compatible with Icom AH-3 and AH-4 tuners and the Alinco EDX-2 tuner. Optional interface cables MFJ-5124 (this is an interface cable for the MFJ Automatic Antenna Tuner series to connect to Alinco-compatible radios) and MFJ-5124I (this is an interface cable for the MFJ Automatic Antenna Tuner series to connect to ICOM-compatible radios) are available from MFJ Enterprises, Inc. Interface cables for compatible Kenwood and Yaesu radios will be available in the future.

The tuners enter 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/300 watts CW
 + Tune in less than 15 seconds, usually less than 5 seconds
 + Over 1000 non-volatile memories for tuner settings
 + Highly efficient switching L-network matching circuit
 + 1.8 to 30 MHz continuous frequency coverage
 + Selectable target SWR 1.5 or 2.0
 + Selectable SWR threshold 0.5, 1.0 or 1.5
 + Lighted cross-needle SWR/wattmeter with high, low and auto range options
 + Built-in frequency counter
 + SO-239 coax fed antenna connector
 + Connector for random wire or single wire antennas
 + Optional remote control
 + Optional radio interface for compatible radios

Technical specifications :
 + Impedance matching range: 12 to 800 ohms
 + Minimum power for tuning: 10 watts
 + Maximum power while tuning: 100 watts with foldback, 20 watts without foldback
 + RF power limit: 600 watts PEP SSB/300 watts CW
 + Frequency range: 1.8 to 30 MHz continuous coverage
 + Frequency counter accuracy: ±1 kHz across HF bands
 + Frequency counter range: up to 50 MHz
 + 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: 100 years
 + Power requirements: 12 - 15 volts DC, 2.1 × 5.5 mm coaxial plug, center pin positive
 + Current consumption: 1 amp or less
 + Dimensions (approx.): 10.1 × 2.8 × 9.2 in. (257 × 71 × 234 mm) (width/height/depth) not including connectors
 + Weight (approx.): 3.7 lb (1.68 kg)
 

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