RU-4:1 MANUAL MANUAL REV A
LDG RU-4:1
200 Watt Unun
LDG Electronics
1445 Parran Road
St. Leonard MD 20685-2903 USA
Phone: 410-586-2177
Fax: 410-586-8475
ldg@ldgelectronics.com
www.ldgelectronics.com
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Table Of Contents
Introduction 2
Specifications 2
An Important Word About Power Levels 3
Important Safety Warning 3
Installation 3
Waterproofing The RU-4:1 4
Care and Maintenance 4
Technical Support 4
Two-Year Transferrable Warranty 5
Out Of Warranty Service 5
Returning Your Product For Service 5
Product Feedback 5
INTRODUCTION
LDG pioneered the automatic, wide-range switched-L tuner in 1995. From its laboratories in
St. Leonard, Maryland, LDG continues to define the state of the art in this field with innovative
automatic tuners and related products for every amateur need.
Congratulations on selecting the LDG RU-4:1 Unun. Your LDG Unun allows you to connect
longwires and vertical antennas to your LDG tuner. The RU-4:1 provides a 4:1 impedance
transformation, and is especially designed for use with the LDG S9 series of vertical antennas. In
cases where the antenna is already resonant, the RU-4:1 may be the only thing you need to
connect your antenna directly to your transceiver.
SPECIFICATIONS
Compact, sturdy construction
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SO-239 jack for coax input
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Two twist-on 5-way binding posts for connection to antenna
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Water-resistant; can be made waterproof for outdoor use
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Frequency coverage: 1.8 - 30 MHz
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Power rating: 200 watts continuous
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Weight: 6 oz.
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Dimensions: 5”L x 2.5” W x 1.25” H
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Impedance transformation 4:1
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