Model 3140B BiConiLog™ Antenna User Manual Model 3140B mounted onto a 7-TR tripod (not included)
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 2000–2010 by ETS-Lindgren L.P. All Rights Reserved.
Table of Contents Notes, Cautions, and Warnings ................................................ v 1.0 Introduction .......................................................................... 7 About Mounting the Model 3140B ................................................................. 9 7-TR Tripod Positioner........................................................................... 9 ETS-Lindgren Product Information Bulletin ................................................. 10 2.0 Maintenance .......
7.0 Typical Data ........................................................................ 33 Model 3140B Typical VSWR ....................................................................... 33 Model 3140B Typical Antenna Factors ........................................................ 34 Model 3140B Gain ....................................................................................... 35 Model 3140B Typical Forward Power (FP) ..................................................
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 TM Model 3140B BiConiLog is a high-field antenna in the bow tie/log periodic family, providing the highest field-to-power ratio at low frequencies of any of the BiConiLog antennas. The Model 3140B is designed specifically to generate the field levels required for immunity/susceptibility tests required by standards such as IEC/EN 61000-4-3 using the lowest amount of input power possible.
The unique feature of the Model 3140B is the T bow tie elements. A T bow tie increases the equivalent dipole electrical length, thereby decreasing resonant frequency and increasing efficiency in the 20 MHz to 60 MHz range. Similarly, a regular bow tie has a lower resonant frequency than an equal length single-wire dipole. The T bow tie has the first resonance at a frequency where the length is about 0.22λ, a regular bow tie at a length of 0.3λ, and a tuned dipole at about 0.48λ. Thus at 50 MHz the 1.
About Mounting the Model 3140B The Model 3140B can be mounted on the 2-in square booms of these ETS-Lindgren products: • Model 7-TR Tripod Positioner • Model 2075 MiniMast™ • Model 2070/2071 Antenna Positioning Mast See Mounting Illustrations on page 26 for diagrams showing the Model 3140B mounted to these ETS-Lindgren products. For the variety of mounting options available for the Model 3140B, see Mounting Instructions on page 23.
ETS-Lindgren Product Information Bulletin See the ETS-Lindgren Product Information Bulletin included with your shipment for the following: 10 • Warranty information • Safety, regulatory, and other product marking information • Steps to receive your shipment • Steps to return a component for service • ETS-Lindgren calibration service • ETS-Lindgren contact information | Introduction
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 3140B is WARRANTY limited 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: 26 MHz–3000 MHz Input Impedance: 50 Ω VSWR (Average): 2:1 CW Power (Average): • 26 MHz to 150 MHz = 750 W • 150 MHz to 600 MHz = 500 W • 600 MHz to 1 GHz = 365 W • 1 GHz to 3 GHz = 200 W Symmetry: +/- 0.5 dB Connector: Type N female Physical Specifications Height (T Bow Tie): 76.65 cm (30.18 in) Width (T Bow Tie): 161.5 cm (63.60 in) Depth (Length): 151.3 cm (59.
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4.0 Assembly Instructions Before connecting any components, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment.
Model 3140B Assembled 16 | Assembly Instructions
Steps to Assemble the Model 3140B To eliminate stress and prevent damage to the balun box connection, you must support the antenna while attaching the bow tie elements. ATTACH BOW TIE ELEMENTS 1. Place the bow tie vertically on the floor and hold the antenna horizontally. See illustration on next page. 2. Fit the bow tie into one side of the balun. 3. Insert and tighten the knob. 4. Carefully place the antenna in a vertical position with the feet of the balun box level and on a flat surface. 5.
| Assembly Instructions
ATTACH T LEG ELEMENTS 6. Insert one long T leg element into the clamp and tighten the clamp screws. See illustration on next page. 7. Repeat for second T leg element.
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ATTACH DIAGONAL STRUTS 8. Attach the four diagonal struts. • Loosen the thumbscrew at each strut mount on the T leg element and at the boom. • Place the pocket of the straight end facing the raised face of each mount. • Tighten the thumbscrew.
ATTACH V ELEMENTS 9. Attach the V elements and tighten the thumbscrews through the boom The Model 3140B is now ready for mounting to a tripod or mast. See Mounting Instructions on page 23.
5.0 Mounting Instructions Before connecting any components, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment. The Model 3140B is a precision measurement device. Handle with care. Do not mount the Model 3140B onto an ETS-Lindgren 4-TR Tripod.
Using Included Adapters to Mount to an Offset Boom ATTACH INCLUDED MOUNTING ADAPTERS TO MODEL 3140B To allow manual polarization of the Model 3140B, install the 100989 polarizing adapters with the curve at the top of each adapter facing the same direction. To prohibit manual polarization, install one adapter with the curve facing the opposite direction from the other. 1. Place one 100989 polarizing adapter between the shoulders of one of the mounting brackets on the antenna.
ATTACH MODEL 3140B TO AN ETS-LINDGREN OFFSET BOOM 1. Place the Model 3140B onto the offset boom with the attached polarizing adapters flat against the top surface of the boom. 2. Holding the Model 3140B securely, insert one 105861B 1/4–20 thread insert into the underside of the offset boom. 3. Attach the two mount knobs and tighten to secure the Model 3140B to the offset boom.
Mounting Illustrations MODEL 3140B ON 7-TR TRIPOD POSITIONER 26 | Mounting Instructions
MODEL 3140B ON MODEL 2075 MINIMAST Mounting Instructions | 27
MODEL 3140B ON MODEL 2070/2071 ANTENNA POSITIONING MAST 28 | Mounting Instructions
Additional Mounting Options 7-TR AND MAST MOUNTING OPTIONS Following are options for mounting the Model 3140B 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.
2X2 BOOM MOUNTING OPTIONS Following are options for mounting the Model 3140B onto a 2x2 boom. Contact the ETS-Lindgren Sales Department for information on ordering optional mounting hardware.
6.0 Application TM After mounting the Model 3140B BiConiLog , connect an N-type coaxial cable from the antenna connector to a signal generator or amplifier. Contact with any metal or non-metallic structure can capacitively load the antenna, which may cause unrepeatable results. Therefore, make sure that no part of the dipole elements or bow ties is in contact with the tripod or tower, particularly in vertically-polarized tests.
P( E V / m) = E 2 P(1 V / m) To determine the additional amplifier overhead required to handle 80% amplitude 2 modulation, multiply the result by 3.24 (1.8 ). Actual transmitted field strength should be verified using an ETS-Lindgren Model HI-6005 Field Probe, or equivalent. The forward power data graphs on page 39 and page 40 show power requirements for the lower frequencies at three meters based on measurements using a field probe on an Open Area Test Site (OATS) over both conducting 2 ground and a (2.
7.0 Typical Data Model 3140B Typical VSWR This graph illustrates the typical VSWR for Model 3140B in the frequency range 26 MHz to 3000 MHz.
Model 3140B Typical Antenna Factors This graph illustrates the typical horizontal antenna factors for the Model 3140B in the frequency range 26 MHz to 3000 MHz. The separation distance for the ANSI C63.5 three and 10 meter calibrations is measured from the antenna midpoint, while for SAE/ARP-958 one meter calibrations the distance is measured from the antenna tip. Midpoint is defined as half the distance between the small elements and the bow ties, which is about 65 cm from the small end tip.
Model 3140B Gain This graph illustrates one and three meter gain.
Model 3140B Typical Forward Power (FP) The forward power graphs illustrate the typical forward power required for one, three, and 10 V/m (with and without 80% amplitude modulation). • The graph on page 37 illustrates one meter from the tip of the antenna, and the graph on page 38 illustrates three meters from the tip of the antenna.
TYPICAL 1 METER FP BASED ON 1 METER ANTENNA FACTOR Typical Data | 37
TYPICAL 3 METER FP BASED ON 3 METER ANTENNA FACTOR 38 | Typical Data
Forward Power (W) Typical Data 0.01 20 0.
| Typical Data 0.01 20 0.
Appendix A: Warranty See the Product Information Bulletin included with your shipment for the complete ETS-Lindgren warranty for your Model 3140B. DURATION OF WARRANTIES FOR MODEL 3140B All product warranties, except the warranty of title, and all remedies for warranty failures are limited to two years.