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LDG RBA-1 4:1 Balun
LDG RBA-1:1 1:1 Balun
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1445 Parran Road, PO Box 48
St. Leonard, MD 20685
Tech Support: 410-586-2177
Toll Free Order: 1-877-890-3003
24 Hour FAX: 410-586-8475
www.ldgelectronics.com
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Table of Contents
Summary of Contents for LDG RBA-1
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Page 1: Table Of Contents
LDG RBA-1 4:1 Balun LDG RBA-1:1 1:1 Balun Table of Contents Introduction Features Specifications Preparation An important word about power levels: Installation Care and Maintenance Technical Support Warranty and Service Feedback Error! Bookmark not defined. 1445 Parran Road, PO Box 48 St. -
Page 2: Introduction
Congratulations on selecting the LDG balun. Your LDG balun allows you to connect longwires and antennas fed with ladder line to your LDG tuner. Two versions are available: the RBA-1 provides a 4:1 impedance transformation, while the RBA-1:1 has 52 ohm input and output. -
Page 3: Preparation
Preparation As it comes from the factory your LDG balun is water resistant. There are neoprene seals under the SO-239 coax socket and the two binding posts. If the balun is mounted with the removable lid (back) facing down (that is, with the writing facing up), it is reasonably water resistant. You can make it completely waterproof and suitable for direct exposure to the weather at any mounting angle for outdoor use if you wish. -
Page 4: Installation
Direct connection: You can mount your LDG balun directly to the output jack of your tuner using a male-male PL- 259 adapter (not supplied). Simply attach the adapter to the balun, then attach the balun to the output jack. Make sure the balun has adequate mechanical support, so it does not place excessive torque on the antenna jack of your tuner or radio. - Page 5 Balanced RBA-1 4:1 Balun Electronics Unbalanced tuner Antenna support (tower, post, tree, etc) (Not to scale) Buried ground system LDG strongly recommends that you use a high-quality, properly installed lightning arrestor in all your antenna feed lines.
- Page 6 Theory of operation: Virtually all amateur transmitters and transceivers in use today, and all LDG tuners, are designed with an unbalanced output. This means that the output signal appears on a single conductor referenced to a grounded second conductor. Most amateur transmitters use a “pi network” output, and LDG tuners employ a “switched-L”...
- Page 7 This common-mode current has three disadvantages. First, it radiates a signal that can distort the radiation pattern of the antenna. For example, the symmetrical “figure eight” pattern of a dipole can be distorted into a highly asymmetric blob who’s performance is difficult or impossible to predict.
- Page 8 Current baluns do not place an inductance across the load, and present an equal current in each side of the balanced output over a somewhat wider range of conditions. Current baluns also have a somewhat wider bandwidth. The LDG RBA-1:1 is a current balun, while the RBA-1 is a voltage balun.
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Page 9: Care And Maintenance
A return form is provided on our web site for your convenience. If you need to return your LDG balun to us for service, package it carefully, keeping in mind that we will re-use your packaging to return the unit to you. A self-addressed return-shipping label, while not required, will help insure speedy and accurate delivery of your repaired unit.
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