MFJ MFJ-869 - Specifications; Amplifier Protection

MFJ-869 MFJ Giant automatic SWR/Wattmeter Instruction Manual
© 2009-2010 MFJ Enterprises, Inc.
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Specifications
• RF power range : 20, 200 or 1500 watts
• Frequency range : 1.8 to 54 MHz continuous coverage
• Frequency counter accuracy : ±1 kHz
• A/D conversion resolution : 10-bit
• Memory endurance : 1 million erase/write cycles typical
• Memory data retention : 100 years typical
• Power supply requirement : 12 - 15 volts DC
• Current consumption : 350 milliamps or less
• Dimensions (projections included) : 7 ½ × 3 ¾ × 6 ¾ in; 191 × 95 × 171 mm (w × h × d)
• Analog meter : 6 ½ inches backlit single-needle (diagonally)
• TRANSMITTER connector : SO-239
• ANTENNA connector : SO-239
• POWER connector : 2.1 × 5.5 mm coaxial plug, center pin positive
• RS-232 connector : D-sub 9-pin
• RLY connector : 3.5 mm stereo phone
• AMP ENABLE connectors : Phono (RCA) × 2
† Specifications and design are subject to change without notice or obligation.
Amplifier Protection
The MFJ-869 is unique in that it provides Amplifier Bypass Control
TM
for hands-free protection of your
amplifier during high SWR events. This capability is provided by passing the amplifier enable control
line to your amplifier through the MFJ-869 AMP ENABLE IN/OUT connectors. A normally closed
high-speed reed relay interrupts the amplifier enable signal 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-869 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-869.