MFJ-993BRT 300 Watt IntelliTuner
TM
Automatic Remote Antenna Tuner Instruction Manual
© 2011 MFJ Enterprises, Inc
MFJ-993BRT Version 1A
2
Features
•
Automatically matches antennas from 6 to 1600 ohms impedance (SWR up to 32:1)
•
Handles 300 watts PEP SSB, 150 watts CW
•
Tunes in less than 20 seconds, usually less than 5 seconds
•
Over 2,000 non-volatile memories for tuner settings
•
Highly efficient switched–L network matching circuit
•
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
Specifications
•
Impedance matching range: 6 to 1600 ohms resistive. The reactive tuning range is a function of
the maximum inductance (24uHy) and maximum capacitance (3900pf) available for a given
frequency or band. The MFJ-993BRT will tune the following end-fed antenna lengths:
o
90-foot or longer antenna on 160 meters
o
25-foot or longer antenna on 80-meters
o
8-foot or longer antenna on 40-10 meters.
Note: The optional MFJ-2904 external inductor extends the MFJ-993BRT tuning range to 160
meters for popular 43-foot verticals.
•
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: 300 watts PEP SSB, 150 watts CW
•
Frequency range: 1.8 to 30 MHz continuous coverage
•
Capacitance range: 0 to 3908 pF nominal (256 values)
•
Inductance range: 0 to 24.86
µ
H nominal (256 values)
•
Relay contact ratings: 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: > 100 years
•
Power requirements: 12 - 15 volts DC supplied via MFJ-4117 Bias-Tee on coaxial input
2.1x5.5mm coaxial plug center pin positive
•
Current consumption: 1.4 amps or less
•
Dimensions (approx.): 10-1/4 × 2-1/2 × 14 in. (261 × 64 × 356 mm) (width/height/depth) including
connectors and mounting brackets
•
Weight (approx.): 3.5 lb (1.60 kg)
† Specifications and design are subject to change without notice.
