MFJ-998 Legal Limit IntelliTuner Automatic Antenna Tuner
Instruction Manual
©
2007-2010 MFJ Enterprises, Inc.
2
Like all MFJ’s
IntelliTuners
TM
, the MFJ-998 supports radio tuner interfaces that are compatible with
Alinco EDX-2 tuner, Icom AH-3 and AH-4 tuners, Kenwood AT-300 tuner, Yaesu FC-30 tuner, and
Yaesu FH-1 and FH-2 remote controls. Optional interface cables MFJ-5114A (for Alinco), MFJ-5114I
(for Icom), MFJ-5114K (for Kenwood), and MFJ-5114Y/Y3/Y4 (for Yaesu) are available from MFJ
Enterprises, Inc.
The MFJ-998 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 1600 ohms impedance (SWR up to 32:1)
•
Handles 1500 watts SSB/CW
•
Tunes in less than 20 seconds, usually less than 5 seconds
•
Amplifier Bypass Control
TM
automatically protects your amplifier during tuning and external high
SWR events
•
Over 20,000 non-volatile memories for tuner settings
•
Four memory banks per antenna with over 2500 memories per bank
•
Highly efficient switched–L network matching circuit
•
Direct read-out of matching L/C values available after tuning
•
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
•
Adjustable amp bypass SWR from 1.5 to 3.0
•
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 peak hold and range options
•
Audio SWR meter
•
Built-in frequency counter for remembering frequency-specific matching values
•
Built-in radio interface circuitry for compatible radios
•
Two SO-239 coax fed antenna connectors
•
Connector for random wire or single wire antennas
•
Field upgradeable firmware
Specifications
•
Impedance matching range
: 12 to 1600 ohms
•
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
: 1500 watts SSB/CW
•
Frequency range
: 1.8 to 30 MHz continuous coverage
•
Frequency counter accuracy
: ±1 kHz across HF bands
•
A/D conversion resolution
: 10-bit
•
Forward power display resolution : 0.1 for < 100 watts and 1 for
≥
100 watts
•
Reflected power display resolution : 0.1 for < 10 watts and 1 for
≥
10 watts
