MFJ-998 Legal Limit IntelliTuner Automatic Antenna Tuner Instruction Manual
© 2007-2010 MFJ Enterprises, Inc.
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• SWR display resolution : 0.1
• Power bar meters resolution : 60 segments
• SWR bar meter resolution : 31 segments
• Capacitance range : 0 to 3926 pF nominal (256 values) on input side
: 0 to 976 pF nominal (64 values) on output side
• Inductance range : 0 to 24.28 μH 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 requirement : 12 - 15 volts DC
• Current consumption : 1.4 amps or less
• Dimensions (projections included) : 12 ¾ × 4 × 14 ¾ in; 325 × 102 × 375 mm (w × h × d)
• Weight : Approx. 7 lb 12 oz; 3.5 kg
• Display : 2-line × 16-character backlight LCD
• TRANSMITTER connector : SO-239
• ANTENNA connectors : SO-239 × 2
• WIRE connector : Ceramic binding post
• POWER connector : 2.1 × 5.5 mm coaxial plug, center pin positive
• RADIO INTERFACE connector : 8-pin modular (RJ-45)
• RS-232 connector : D-sub 9-pin
• AMP ENABLE connectors : Phono (RCA) × 2
† Specifications and design are subject to change without notice or obligation.
Transceiver Protection
Like all MFJ IntelliTuners
TM
, the MFJ-998 can provide automatic control interfacing with most popular
transceivers through optional transceiver interface cables. When interfaced to your transceiver with the
appropriate cable, the MFJ-998 automatically puts your transceiver into a low power CW tune mode
when tuning is initiated. More details are provided in the “Radio Interface” section of this manual.
Note: An optional transceiver interface cable is NOT necessary for normal operation. However, a
transceiver interface cable simplifies operation by automatically keying your transceiver in a
low power TUNE mode.
Amplifier Protection
The MFJ-998 is unique in that it provides Amplifier Bypass Control
TM
for hands-free protection of your
amplifier during tuning and high SWR events. This capability is provided by passing the amplifier enable
control line to your amplifier through the MFJ-998 AMP ENABLE IN/OUT connectors. A normally
closed high-speed reed relay interrupts the amplifier enable signal when the MFJ-998 begins tuning, or
when a user high-SWR pre-set is exceeded. A normally closed relay is used so that your amplifier system
works properly when the MFJ-998 is turned off.
Note: MFJ recommends that the amplifier enable control signal be always connected through the
AMP ENABLE IN/OUT connectors on the MFJ-998.
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