Model 3144 Log Periodic Dipole Array Antenna User Manual
ETS-Lindgren L.P. reserves the right to make changes to any product described herein in order to improve function, design, or for any other reason. Nothing contained herein shall constitute ETS-Lindgren L.P. assuming any liability whatsoever arising out of the application or use of any product or circuit described herein. ETS-Lindgren L.P. does not convey any license under its patent rights or the rights of others. © Copyright 1997–2010 by ETS-Lindgren L.P. All Rights Reserved.
Table of Contents Notes, Cautions, and Warnings ................................................ v 1.0 Introduction .......................................................................... 7 Optional Items ................................................................................................ 8 Support Rod........................................................................................... 8 Tripod.............................................................................................
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Notes, Cautions, and Warnings Note: Denotes helpful information intended to provide tips for better use of the product. Caution: Denotes a hazard. Failure to follow instructions could result in minor personal injury and/or property damage. Included text gives proper procedures. Warning: Denotes a hazard. Failure to follow instructions could result in SEVERE personal injury and/or property damage. Included text gives proper procedures.
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1.0 Introduction The ETS-Lindgren Model 3144 Log Periodic Dipole Array is a linearly polarized, broadband antenna designed to operate over the frequency range of 80 MHz to 2 GHz. The choice of scaling factors, the various diameters of each element, and the center-to-center spacing of the booms are such that excellent VSWR characteristics are obtained throughout the operating frequency range. The precise design of the feed and the positioning of the elements on the boom yield optimum phase relationship.
Optional Items SUPPORT ROD Antenna mount with insert drilled to accept ETS-Lindgren or other tripods with standard 1/4–20 threads. TRIPOD ETS-Lindgren offers the following non-metallic, non-reflective tripods for use at both indoor and outdoor EMC test sites. • 4-TR Tripod—Constructed of linen phenolic and delrin, designed with an adjustable center post for precise height adjustments. Maximum height is 2.0 m (80.0 in), and minimum height is 94 cm (37.0 in). This tripod can support up to an 11.8 kg (26.
• 7-TR Tripod—Constructed of PVC and fiberglass components, providing increased stability for physically large antennas. The unique design allows for quick assembly, disassembly, and convenient storage. Allows several different configurations, including options for manual or pneumatic polarization. Quick height adjustment and locking wheels provide ease of use during testing. Maximum height is 2.17 m (85.8 in), with a minimum height of 0.8 m (31.8 in). This tripod can support a 13.5 kg (30 lb) load.
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2.0 Maintenance Before performing any maintenance, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment. Maintenance of the Model 3144 is limited WARRANTY to external components such as cables or connectors. If you have any questions concerning maintenance, contact ETS-Lindgren Customer Service.
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3.0 Specifications Electrical Specifications Frequency Range: 80 MHz–2 GHz Input Impedance: 50 Ohms VSWR: Average: 1.2:1 Maximum: 2.0:1 CW Power: 1000 W Symmetry: +/– 0.5 dB Connector: Type N Female Physical Specifications Height: 6.4 cm (2.5 in) Width: 213.4 cm (84.0 in) Depth: 167.6 cm (66.0 in) Weight: 4.3 kg (9.
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4.0 Mounting & Assembly The Model 3144 antennas are precision measurement devices. Handle your antenna with care. Mount the Model 3144 Log Periodic Dipole Array Antenna first, and then attach the elements to the antenna.
To attach the included adapters to the Model 3144: 1. If required, insert the 1/4–20 thread insert into the polarizing adapter. 2. Remove the mounting knob from the mounting bracket on the antenna. 3. Slide the polarizing adapter into the mounting bracket by placing the polarizing adapter placed between the shoulders of the mounting bracket.
Do not cross thread or permanent damage to the adapter could occur. 4. Thread the mounting knob through the mounting bracket, then through the polarizing adapter, and finally through the hex nut. 5. Tighten the mounting knob to secure the antenna. 6. Attach the polarizing adapter and antenna to tripod or tower, as required. ADDITIONAL 4-TR MOUNTING OPTIONS Following are additional options for mounting the Model 3144 onto an ETS-Lindgren 4-TR tripod.
ADDITIONAL 7-TR AND MAST MOUNTING OPTIONS Following are options for mounting the Model 3144 onto an ETS-Lindgren 7-TR Tripod or mast. Contact the ETS-Lindgren Sales Department for information on ordering optional mounting hardware. Mast refers to 2070 Series, 2075, and 2175 Antenna Towers. 7-TR refers to 109042 and 108983 booms: • 109042 boom—Straight boom; for general antenna mounting on a 7-TR.
ADDITIONAL 2X2 BOOM MOUNTING OPTIONS Following are additional options for mounting the Model 3144 onto a 2x2 boom. Contact the ETS-Lindgren Sales Department for information on ordering optional mounting hardware. 2x2 boom refers to a typical 2-inch by 2-inch boom.
Assembly Instructions To facilitate transport, the Model 3144 is shipped with the five longest elements on each side removed. After you mount the antenna, follow these assembly steps: • Do not cross thread or permanent damage to the antenna and element could occur. • Do not overtighten or use excessive force or permanent damage to the antenna and element could occur. 1. Carefully thread one of the numbered elements into the corresponding numbered receptacle. 20 2.
5.0 Application Before connecting any components, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment. After mounting the Model 3144 Log Periodic Dipole Array Antenna onto an ETS-Lindgren tripod or antenna mast adapter, connect an N-type coaxial cable from the antenna connector to a generator (immunity) or receiver (emissions). Both horizontal and vertical polarizations are easily accomplished when the Model 3144 is mounted onto a tower or tripod.
For immunity testing, the electric field strength generated at a distance d can be approximated by: E ( V / m) = 30 Pg d d = distance, in meters g = numeric gain (10 G[dB]/10) P = antenna net input power, in watts An estimate of the power required for any field strength E can be obtained from Typical Data on page 23.
6.
Model 3144 VSWR Model 3144 Half-Power Beamwidth 24 | Typical Data
Model 3144 Forward Power 1M Model 3144 Forward Power 3M Typical Data | 25
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Appendix A: Warranty See the Product Information Bulletin included with your shipment for the complete ETS-Lindgren warranty for your Model 3144. DURATION OF WARRANTIES FOR MODEL 3144 All product warranties, except the warranty of title, and all remedies for warranty failures are limited to two years.
