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Application

MODEL 3140 BICONILOG™ ANTENNA

12

© EMC TEST SYSTEMS, L.P. – MARCH 2002

REV C – PN 399258

APPLICATION

Assemble and mount the Model 3140 per the instructions in

the previous sections. 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, care must be taken to

ensure that no part of the dipole elements or bow-ties are in

contact with the tripod or tower, particularly in vertically-

polarized tests. Where possible, run the feed cable straight

back at least 1 meter or more from the Model 3140 before

dropping vertically.

Both horizontal and vertical polarization is easily

accomplished when the Model 3140 is mounted on an

ETS-Lindgren tower. The Model 7-TR tripod is designed

specifically for the T bow-tie BiConiLog™ antennas to

allow easy polarization changes, and with the air

polarization option can provide automated polarization

using a Model 2090 controller. The previous section

“Mounting Instructions” shows the mounting scheme for

both ETS-Lindgren towers and the 7-TR tripod.

For immunity testing, the electric field strength generated

at a distance

d

can be approximated by the formula

(

)

E

Pg

d

V / m

=

30

where

d

is in meters,

g

is the numeric gain (10

G

[dB]/10,

see attached calibration data), and

P

is antenna net input

power in Watts. An estimate of the power required for any

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Содержание BiConiLog 3140

Страница 1: ... EMC TEST SYSTEMS L P MARCH 2002 REV C PN 399258 Model 3140 BiConiLog Antenna MANUAL ...

Страница 2: ...nvey any license under its patent rights or the rights of others Copyright 2002 by EMC Test Systems L P All Rights Reserved No part of this document may be copied by any means without written permission from EMC Test Systems L P E MAIL INTERNET Support ets lindgren com http www ets lindgren com USA 1301 Arrow Point Dr Cedar Park TX 78613 P O Box 80589 Austin TX 78708 0589 Tel 512 531 6400 Fax 512 ...

Страница 3: ...ANTENNA EMC TEST SYSTEMS L P MARCH 2002 REV C PN 399258 Table of Contents INTRODUCTION 1 ASSEMBLY INSTRUCTIONS 4 MOUNTING INSTRUCTIONS 8 APPLICATION 12 TYPICAL DATA 14 SPECIFICATIONS 18 MAINTENANCE 19 WARRANTY STATEMENT 20 ...

Страница 4: ...MODEL 3140 BICONILOG ANTENNA EMC TEST SYSTEMS L P MARCH 2002 REV C PN 399258 ...

Страница 5: ...e the traditional use of two antennas in the 26 1000 MHz EMC test frequency range Many EMC antennas are variations of a standard tuned dipole which must be nearly half a wavelength long to transmit or receive energy most efficiently Thus at 26 MHz a tuned dipole would have to be approximately 5 3 meters long about 4 6 meters long at 30 MHz and 2 8 meters long at 50 MHz Unfortunately this is too un...

Страница 6: ...range Similarly a regular bow tie has a lower resonant frequency than an equal length single wire dipole The T bow tie has its first resonance at a frequency where its length is about 0 22λ a regular bow tie at a length of 0 3λ and a tuned dipole at about a length of 0 48λ Thus at 50 MHz the 1 4 m long T bow tie of the Model 3140 behaves like a 2 8 m tuned dipole Cross polar radiation is minimized...

Страница 7: ...150 MHz the radiation in the plane of the elements is directional The antenna has dual mounting bracket and 1 4x20 UNC knob for attaching to ETS Lindgren tripod and tower adapters The brackets are spaced to align with the mounting holes on the Model 7 TR tripod and the ETS Lindgren towers Typical antenna factor data is included in Figure 11 Note The Model 3140 is designed only for immunity testing...

Страница 8: ...Elements 4 ea Diagonal Struts 2 ea Boom adapters for ETS booms with 7 8 mount holes 2 ea Thread inserts 7 8 to Step 1 Attach a bow tie element to the antenna balun box see Figure 1 The bow tie should be standing vertical and the antenna held horizontal and attached to it using the hand screw knob Supporting the antenna during the assembly process will eliminate stress at the connection of the balu...

Страница 9: ...ure 2 The antenna can now rest by itself on the feet of the balun box and the bottom edge of the bow tie elements FIGURE 2 Assembly Steps 2 through 4 Step 3 Attach the other bow tie element to the antenna balun box see Figure 2 The antenna should rest on the balun end and stand vertically to attach the 2nd bow tie with the opposite hand knob Step 4 The long T leg elements are installed and clamped...

Страница 10: ...ep 5 The four diagonal struts should be installed Loosen the thumbscrews at the mount on the T legs and at the boom mounts to install the strut ends Place the pocket of the straight end facing the raised face of each mount and tighten the thumbscrew to lock in place see Figure 3 FIGURE 3 Assembly Step 5 ...

Страница 11: ... elements should be installed and tightened using the thumbscrews through the boom see Figure 4 FIGURE 4 Assembly Step 6 The antenna is now ready for mounting on a boom of a stand such as the ETS Lindgren 7 TR or mast such as the ETS Lindgren 2070 series See the next section Mounting Instructions for more details ...

Страница 12: ... make the Model 3140 very stable on a boom when polarizing and moving up and down a mast Step 1 Install the antenna adapters onto the two mount brackets on the antenna boom see Figure 5 These have a 7 8 threaded hole for an ETS Lindgren mount knob Install the threaded insert adapter into the 7 8 hole if a thread is required on the mounting stand or mast FIGURE 5 Attachment of antenna mount adapter...

Страница 13: ... 2 square boom see Figure 6 FIGURE 6 Attachment of Model 3140 to perforated offset boom The antenna can be mounted to the 2 square booms of the following ETS Lindgren products Model 7 TR tripod stand see Figure 7 Model 2075 MiniMast tower see Figure 8 and Model 2070 2071 towers see Figure 9 For other 2 square booms two slip on boom brackets that do not require through holes in the boom can be used...

Страница 14: ...ctions MODEL 3140 BICONILOG ANTENNA 10 EMC TEST SYSTEMS L P MARCH 2002 REV C PN 399258 FIGURE 7 Attachment of Model 3140 to Model 7 TR heavy duty antenna stand FIGURE 8 Attachment of Model 3140 to Model 2075 MiniMast ...

Страница 15: ...MODEL 3140 BICONILOG ANTENNA Mounting Instructions EMC TEST SYSTEMS L P MARCH 2002 11 REV C PN 399258 FIGURE 9 Attachment of Model 3140 to Model 2070 or 2071 Tower ...

Страница 16: ... least 1 meter or more from the Model 3140 before dropping vertically Both horizontal and vertical polarization is easily accomplished when the Model 3140 is mounted on an ETS Lindgren tower The Model 7 TR tripod is designed specifically for the T bow tie BiConiLog antennas to allow easy polarization changes and with the air polarization option can provide automated polarization using a Model 2090...

Страница 17: ...ired for 1 V m by the desired E field squared or P E E P V m V m 2 1 To determine the additional amplifier overhead required to handle 80 amplitude modulation multiply the result by 3 24 1 82 Actual transmitted field strength should be verified using an ETS Lindgren Model 7200 series electric field probe or equivalent Figures 14 and 15 show power requirements for the lower frequencies at 3 meters ...

Страница 18: ...ypical forward power required for 1 3 and 10 V m with and without 80 amplitude modulation at 1 meter from the tip of the antenna while Figure 13 is for 3 meters from the antenna tip Figures 14 and 15 show power requirements for the lower frequencies at 3 meters based on measurements using a field probe on an OATS over both conducting ground and a 2 4m 2 ferrite absorber field over conducting groun...

Страница 19: ... TEST SYSTEMS L P MARCH 2002 15 REV C PN 399258 10 100 1000 2000 1 10 100 VSWR Frequency MHz FIGURE 10 Model 3140 typical VSWR 20 100 1000 2000 0 5 10 15 20 25 30 35 1 m 3 m 10 m AF dB 1 m Frequency MHz FIGURE 11 Model 3140 typical antenna factors ...

Страница 20: ...1 V m 80 AM 3 V m 1 V m 80 AM 1 V m Forward Power W Frequency MHz FIGURE 12 Model 3140 typical 1 meter forward power based on 1 meter antenna factor 20 100 1000 2000 0 01 0 1 1 10 100 500 10 V m 80 AM 10 V m 1 V m 80 AM 3 V m 1 V m 80 AM 1 V m Forward Power W Frequency MHz FIGURE 13 Model 3140 typical 3 meter forward power based on 3 meter antenna factor ...

Страница 21: ... m 1 V m 80 AM 3 V m 1 V m 80 AM 1 V m Forward Power W Frequency MHz FIGURE 14 Model 3140 typical 3 meter forward power measured over ferrite tile 20 100 300 0 01 0 1 1 10 100 1000 10 V m 80 AM 10 V m 1 V m 80 AM 3 V m 1 V m 80 AM 1 V m Forward Power W Frequency MHz FIGURE 15 Model 3140 typical 3 meter forward power measured over conducting ground ...

Страница 22: ...399258 SPECIFICATIONS Electrical nominal Frequency range 26 2000 MHz Input impedance 50 Ω VSWR 2 1 average CW power 750 W Symmetry 0 5 dB Connector Type N female Physical Height T bow tie 76 65 cm 30 18 in Width T bow tie 161 5 cm 63 60 in Depth length 149 3 cm 58 78 in Weight 10 kg 22 lbs ...

Страница 23: ...y the generated field is measured with a calibrated field probe not the Model 3140 Thus it is not required that the Model 3140 be recalibrated regularly If you would like to have your Model 3140 antenna verified or serviced please contact our Calibration Department For more information about our calibration services or to place an order for antenna calibration visit our calibration website at http...

Страница 24: ...r s choice exclusive of any duties or taxes If the Seller determines that warranty service can only be performed at the Buyer s location the Buyer will not be charged for the Seller s travel related costs This warranty does not apply to v Normal wear and tear of materials v Consumable items such as fuses batteries etc v Products that have been improperly installed maintained or used v Products whi...

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