Model 3301C Active Monopole Antenna User Manual - ETS
Contents
1. 8 Monopole 9 10 Rechargeable Nickel Metal Hydride batteries 8 10 MIL STD 461F TEOSUISIE 10 Light Tripod Cams cerea Bo v aA odes 11 ETS Lindgren Product Information Bulletin 12 2 0 rire 13 Battery Replacement DRM M FU YPF 13 us 16 Replacement and Optional 16 17 3 0 19 Operational Specifications 19 Table of Acceptable Pulse Repetition Rates 20 21 RP e REA ort OE pa REND PRECES tunes 21 AC Adapter 8 Battery Specifications 22 4 0 Assembly Instructions 23 Counterpoise Monopole 23 MIE STDS461F EBSSUNID ii or2. bulkhead connector Right angle bracket 4 TR Light Tripod Optional ETS Lindgren offers the non metallic non reflective 4 TR Light Tripod for use at both indoor and outdoor EMC test sites Constructed of linen phenolic and delrin designed with an adjustable center post for precise height adjustments Maximum height is 1 00 m 39 37 in and minimum height is 0 50 m 19 68 in This tripod can support up to a 2 27 kg 5 0 Ib load Model 3301C shown mounted with MIL STD 461F Test Kit onto 4 Light Tripod 11 ETS Lindgren Product Information Bulletin See the ETS Lindgren Product Information Bulletin included with your shipment for the following 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 12 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 3301C is limited external components such as cables or connectors WARRANTY Clean the exterior of the cabinet using a damp cloth and mild cleaner Always unplug the unit before cleaning If you have any questions concerning maintenance contact ETS Lindgren Customer Service Batter
3. 4 F to 104 F Dimensions Length 19 05 cm 7 5 in Width 19 05 cm 7 5 in Height from feet to thumbscrews 8 9 cm 3 5 in Weight antenna base only 1 4 kg 3 1 Ib 22 4 0 Assembly Instructions Before connecting any components follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment The 1 4 20 mount on the bottom of the Model 3301C Active Monopole gt Antenna is not a ground location See Mounting Instructions on page 31 for information on mounting the gt Model 3301C For information on using the MIL STD 461F Test Kit see page 28 Counterpoise and Monopole Element The counterpoise is designed to be placed on top of the Model 3301C This prevents the body of the unit from intruding into the field to be measured Do not lift the Model 3301C by the counterpoise For protection of the antenna field effect transistor FET it is gt recommended that you use an electrostatic discharge ESD wrist strap at an ESD protective workstation for complete grounding 1 Place the power Grounding strips 2 switch in the RT OFF CHG position 2 Touch the two grounding strips located on top of the Model 3301C 23 3 If not already in Insert thumbscrew knobs P place insert one thumbscrew knob into each of the holes in the grounding strips Slightly tighten the thumbscrew knobs There
4. 4 910051 AC Adapter H 30DTS050 Rechargeable AA NiMH Batteries 2000 mAh 8 Cordset 6 ft IEC 320 C7 to NEMA 5 15 670059 400042 16 Part Description Part Number MIL 461F Test Kit 113359 3301C Calibration Fixture 3301CAL Tripod Non Conductive 1M Light 4 TR 1ML Service Procedures For the steps to return a system or system component to ETS Lindgren for service see the Product Information Bulletin included with your shipment 17 This page intentionally left blank 18 3 0 Specifications Operational Specifications Frequency Range Low Frequency Roll Off High Frequency Roll Off Antenna Factor Saturation Level Minimum Discernible Signal Dynamic Range 30 Hz to 50 MHz maximum usable bandwidth The low frequency roll off is switch selectable to be 3 dB down at 22 kHz 1 9 kHz or 170 Hz Antenna factor is 3 dB down at 30 MHz See data chart on page 54 Unless otherwise noted the low frequency roll off is set at the 170 Hz 3 dB roll off point 0 8 V m narrowband without attenuation 25 with 30 dB of internal attenuation selected 63 dBuV m MHz broadband saturation level See data chart on page 56 For best sensitivity all internal attenuation should be turned off 111 dB at mid band 1 MHz 141 dB with the use of the internal attenuators 19 Saturation Indicator The saturation indicator will properly Impulse Response indicate saturation for pulsed sig
5. ETS Lindgren Product Information Bulletin included with your shipment The DIP switches for internal attenuation and low frequency roll off are located on the system board at designation SW2 and the DIP switches for the audible alarms are located at designation SW1 1 Place the power switch in the OFF CHG position See Operation on page 35 for information on the front panel controls and indicators 2 Remove the monopole element and counterpoise See Counterpoise and Monopole Element on page 23 for more information 3 Disconnect all cables from the antenna base 4 Turn over the Model 3301C antenna base and place it on a stable surface with the bottom facing up 5 Use a Phillips screwdriver to remove the eight screws from around the perimeter of the base Lift the lid to remove it from the base and to access the system board 6 Change the DIP switch settings as required 7 Replace the lid on the base and insert and tighten the screws Do not over tighten 8 Reassemble and re connect the cables 41 Charging the Batteries Never attempt to recharge a non rechargeable CAUTION battery 4 9 For maximum battery life fully charge the batteries before placing the Model 3301C into service for the first time Failing to fully charge the batteries may result in reduced battery life and cause premature battery failure 1 Move the power switch on the Model 3301C to OFF CHG if the power switch is set to ON
6. Manager Vice President Engineering Bryan Sayler Date of Declaration October 23 2009 The authorizing signatures on the EC Declaration of Conformity document authorize ETS Lindgren L P to affix the CE mark to the indicated product CE marks placed on these products will be distinct and visible Other marks or inscriptions liable to be confused with the CE mark will not be affixed to these products ETS Lindgren L P has ensured that appropriate documentation shall remain available on premises for inspection and validation purposes for a period of no less than 10 years 62
7. is no need to ever remove the thumbscrews from the grounding strips you may leave them inserted and tightened securely If you do remove the thumbscrews make sure to place them in a safe retrievable location Tip The two halves of the counterpoise fit together as shown 24 Assembly Instructions 4 Attach left half of counterpoise to grounding strips Fit the keyhole slots over the two thumbscrew knobs located at the back of the Model 3301C Slide the counterpoise forward so that the thumbscrew knobs are flush with the ends of the slots 5 Attach right half of counterpoise to grounding strips Fit the keyhole slots over the two thumbscrew knobs located at the front of the Model 3301C At the same time fit the right half of the counterpoise with the left half Fit keyhole slots over thumbscrews Slide right half at the same time fit the two halves of counterpoise of counterpoise together towards back Slide the right half of the counterpoise towards the back of the Model 3301C so that the thumbscrew knobs are flush with the ends of the slots 6 Tighten all four thumbscrew knobs 7 Assemble the monopole element 26 e Fora finished length of 40 95 in 1040 mm Assemble 2 116474 rod sections and 1 116862 center section Fora finished length of 39 37 in 1000 mm Assemble 2 116474 rod sections Do not use the 116862 center section es With center section 40 95 in 1040
8. of the holder and then press the end of the battery down until the entire battery is secure in the holder TIP To assist in inserting the battery into the holder you might need j to pull the contacts slightly outward 8 Replace the lid on the base and insert and tighten the screws Do not over tighten For maximum battery life fully charge the batteries before placing j them into service for the first time Failing to fully charge the batteries may result in reduced battery life and cause premature battery failure 9 See page 42 for the steps to charge the new batteries 15 Annual Calibration See the Product Information Bulletin included with your shipment for information on ETS Lindgren calibration services Replacement and Optional Parts ETS Lindgren may substitute a similar part or new part number with j the same functionality for another part part number Contact ETS Lindgren for questions about part numbers and ordering parts Following are the part numbers for ordering replacement or optional parts for the Model 3301C Active Monopole Antenna Part Description Part Number 116476 Monopole entire assembly Monopole Element 116474 Rod section without antenna adapter 116862 Center section Note 116474 Rod section with antenna adapter is not a replaceable part if you need that section you will need to order the entire monopole assembly 116476 Counterpoise Half 2 114670 Knobs Counterpoise
9. the batteries will not charge 2 Connect the AC adapter to the electrical mains and then plug the adapter into CHARGER on the Model 3301C For the steps to replace the batteries see Battery Replacement on page 13 42 7 0 Calibrating the Model 3301C Before connecting any components follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment The ETS Lindgren 3301CAL Calibration Fixture incorporates a resistive T network and a SNETS LINDGREN Model 3301CAL 10 picofarad capacitor to perform 3301 the Equivalent Capacitive Substitution Method ECSM of calibration for rod antennas The T allows for accurate reading of the input to the 3301CAL and the capacitor feeds the amplifier through the same impedance as the rod e 5 2 2 ge 2 amp 5 2 2 EN Calibration Steps Depending on the your calibration configuration see Model 3301C Calibration With Receiver and Signal Generator on page 46 Model 3301 Calibration With Network Analyzer on page 47 1 Disconnect the Model 3301C Active Monopole Antenna from power 2 Remove the monopole element 43 3 Insert the mounting stud on the back of the 3301CAL Mounting stud into the Model 3301C rod element mounting hole Rotate to tighten Back Insert mounting stud into rod element mounting hole Connect ground to and rotate to tighten counterpoise mounting s
10. 0 FREQUENCY f Altering Pulse Width Pulse Repetition Rate The following figures A D depict the effect of altering either the pulse width or pulse repetition rate A narrow pulse width A C spreads the pulse energy over a wider frequency band Wider pulses B D cause narrower lobes A low pulse repetition rate A B creates widely spaced spectral lines Faster rates C D increase the spectral line density 51 Active Electric Field Antenna Calibration Fixture SINHO SANTWA SINHO 09 T HJZATIVNV 3ONVISIS3H TIV 30 7 3unixiJ 1531 SINHO 09 YAZAIVNV HOLVH3N39 JO Z 5 A 66 05 52 Active Monopole Antenna Calibration Setup 1531 338 JazAjeuy 3J0 MjJaN no uoneJqi e De J8ajdepy 0 05 uonoasuuo 53 Typical Curves Typical Antenna Factors at the Default Switch Position Off 00000001 0000007 ZH 000007 00001 0001 001 t gt rr 5 Lv ry 9 g D 3 54 Typical Curves Typical Maximum Noise Voltage Using 10 Hz Bandwidth 00000001 0000001 000001 00001 0001 001 0E C gp ssioN nh OF 55 Data and Illustrations 56
11. Model 3301 Active Monopole Antenna User Manual Model 3301C Antenna Base S ETS LINDGREN An ESCO Technologies Company 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 2009 2011 by ETS Lindgren L P Rights Reserved No part of this document may be copied by any means without written permission from ETS Lindgren L P Trademarks used in this document The ETS Lindgren logo is a trademark of ETS Lindgren L P Revision Record MANUAL 3301C ACTIVE ANTENNA USER Part 399792 Rev Iu Initial Release October 2009 Updated part numbers in December 2009 Replacement and Optional Parts C Updated monopole rod July 2011 element information Table of Contents Notes Cautions and Warnings V n UE EET V 1 0 25255 12 00 5 deren 7 Standard COMMOUAUON 8 Anena
12. To antenna antenna mounting mounting hole hole 101913 101937 Fixed LL Swivel Antenna Antenna Insert boom through Insert boom through 33 This page intentionally left blank 34 6 0 Operation Before connecting any components follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment Front Panel Controls and Indicators When you turn on the Model 3301C the saturation and power lights gt will blink an audible alarm will sound for five to eight seconds CHARGE STATUS LED No light off e The AC adapter is not connected to the Model 3301C e The AC adapter is plugged into the Model 3301C but is not connected to power Blue steady The AC adapter is in the process of charging the batteries Blue blinking The AC adapter is in top off mode no action required 35 Green The batteries are charged You may disconnect the AC adapter from the Model 3301C Fault condition If this occurs disconnect the AC adapter from the Model 3301C and then re connect the AC adapter CHARGE STATUS should now display a steady blue light If the red light persists contact ETS Lindgren Customer Service CHARGER CONNECTOR The charger connector is used to recharge the Nickel Metal Hydride NiMH batteries To charge the Model 3301C set the power switch to OFF CHG and plug in the AC adapter The charging circuit will not charge the batteries when t
13. Typical Curves Typical Minimum Discernable Electric Field Levels dB uV m Under Different Bandwidths dBu 10 Hz L c lt gt I m gt e c p 1 i LL CX 1 2132e 3 Typical Antenna Factors for Different Switch Configurations 1 LLL 11 11 LLL TT TT TTT 1 1 TT TT i FLEN 101284 Data lllustrations 10000 100000 1000000 10000000 1000 100 10 Frequency Hz 57 This page intentionally left blank 58 Appendix Warranty the Product Information Bulletin included with your shipment for j the complete ETS Lindgren warranty for your Model 3301C Active Monopole Antenna DURATION OF WARRANTIES FOR MODEL 3301C All product warranties except the warranty of title and all remedies for warranty failures are limited to two years Product Warranted Duration of Warranty Period Model 3301C Active Monopole Antenna 2 Years 59 This page intentionally left blank 60 Appendix EC Declaration of Conformity The EC Declaration of Conformity is the method by which ETS Lindgren L P declares that the equipment listed on this document compl
14. actor of 11 dB 50 dByV 11 dB 1 m 59 dByV 2 dB 1 m 45 Model 3301 Calibration With Receiver and Signal Generator Attenuators may be required if VSWR of the receiver or signal gt generator is high Antenna 46 Receiver m 71 Ci 52 T e iac EE 20601 5 5 F i i 8 14 5 Sj e E Y c 058 m 2 hu _ wit ria ul Signal Generator signal Generator Model 3301 Calibration With Network Analyzer Attenuators are not required with a network analyzer Bal purge t t 4 LOEE Signal Generator ey eS ee kmi Eos TEC 8 N3420NIT 535 C e pod 1 Jaz A eus 109 101110 E LILIS LI Sz 47 This page intentionally left blank 48 8 0 Data and Illustrations Periodic Rectangular Pulse Train gt Es x 29 e Ay E TIME 49 Spectrum of Rectangular Pulse Amplitudes and phases of an infinite number of harmonics are required to fully describe the envelope FREQUENCY HIGH LIMIT elte wit ANTENNA BANDWIDTH SPECTRAL LINES FREQUENCY LOW LIMIT 5
15. adapter 1 116474 Rod section with antenna adapter 1 116862 Center section The monopole may be assembled as follows For finished length of 40 95 1040 mm Assemble all parts including the 116862 center section For a finished length of 39 37 1000 mm Assemble all parts except for the 116862 center section See page 26 for the steps to assemble the monopole 7 b With center section 40 95 in 1040 mm Without center section 39 37 in 1000 mm COUNTERPOISE The two halves assemble into a 24 in by 24 in square 60 96 cm square To extend the ground plane the counterpoise may be attached to a workbench using the holes around the perimeter of the counterpoise Holes around the perimeter of the counterpoise to extend the ground plane RECHARGEABLE AA NICKEL METAL HYDRIDE BATTERIES 8 The Model 3301 is shipped with 8 Nickel Metal Hydride NiMH batteries installed The batteries are rechargeable and include an AC adapter for charging You must charge the batteries before using the Model 3301C for the first time See Charging the Batteries on page 42 for more information MIL STD 461F TEST KIT To comply with the standard the MIL STD 461F Test Kit includes 27 BNC cable BNC bulkhead connector ferrite bead and a right angle bracket For information on using the kit see page 28 10 Cable with BNC connector Ferrite bead
16. crew 4 Connect the 3301CAL ground to one of the counterpoise mounting screws on the Model 3301C 5 Place a signal source on the signal generator port of the 3301CAL and a receiver on the receiver port 6 Terminate the output of the Model 3301C with 50 and record the input signal strength 7 Compensate for test fixture and effective height of antenna The receiver port on the 3301CAL has a 5 db loss in signal strength from the mounting stud due to the resistor network in the fixture In addition the effective height of the 1 04 meter monopole is 0 5 meters this adds a 6 db correction factor making the combined correction factor 11 db 44 8 the receiver cable to the output port on the Model 3301C and then place 50 load on the receiver port of the 3301CAL 9 Read the output signal The antenna factor is the input signal read from the receiver port on the 3301CAL plus the combined correction factor of 11 dB minus the output signal read from the output port on the Model 3301 Both readings are assumed to be logarithmic Example of Antenna Factor Calculation 1 The input read from the 3301CAL receiver port is 50 dBuV 2 output read from the Model 3301C output port is 59 dBuV 3 The antenna factor is the input plus the combined fixture loss and effective height correction factor minus the output Assuming a reading is taken with a 1 MHz signal input to the 3301CAL and a combined correction f
17. enuator or 30 dB attenuator is switched on the Model 3301C can measure field strengths up to 2 5 V m or 25 V m respectively without saturating The unit retains 111 dB of dynamic range but the maximum reading before saturation is raised by 10 dB or 30 dB while the minimum discernible signal is also raised by 10 dB or 30 dB At 2 5 V m with the 10 dB attenuator active the saturation indicator light will again illuminate This indicates a need to switch the 30 dB attenuator on in place of the 10 dB attenuator 38 When using either of the attenuators make sure to add the attenuation to the antenna factor for accurate readings Also note that if both attenuator switches are used the resulting attenuation is approximately 31 dB Both of the internal attenuators have 10 tolerance so they should be calibrated before being used in critical applications For High Sensitivity Readings The Model 3301 is optimized to facilitate extremely sensitive readings For the most sensitive applications all internal attenuation should be off The noise limiting factor on the Model 3301 is the high front end impedance presented to the front end of the wideband amplifier The signal graphs provided in Data and lllustrations on page 49 represent the smallest signal which can be detected with the Model 3301C The data plotted are the noise output of the unit As a S result this forms the noise measurement for signal plus noise to noise rat
18. he Model 3301 1 on For more information see Charging the Batteries on page 42 SATURATION LED The saturation LED indicates that the amplitude of the signal has reached the limits of the internal amplifier after which the output signal will be distorted The saturation indicator will blink red and the unit will beep when the Model 3301C is in saturation Do not take readings when the unit is in saturation Impulsive type signals may put the Model 3301 into a non linear region without triggering the saturation circuit When dealing with impulsive type signals strictly If saturation occurs apply internal attenuation by changing the DIP switch settings See D P Switches on page 38 for more information observe the 63 dBu V m MHz limit If a signal exceeds this limit apply internal attenuation The unit output capability is the limiting factor in handling impulsive type signals Once the internal attenuators are engaged most higher impulsive signals may be measured For example with the 30 dB attenuator engaged a 93 dBuV m MHz signal may be measured 36 OUTPUT CONNECTOR Plug a 50 ohm BNC cable into this connector Connect the other end of the cable to the required monitoring equipment PowER LED gt page 42 for the steps to charge the batteries Green blinking Batteries are low Data produced in this condition may be invalid Suspend testing and charge the batteries No light off Unit is in shu
19. ies with the EMC Directive and Low Voltage Directive Factory Issued by ETS Lindgren L P ETS Lindgren L P 1301 Arrow Point Drive 1301 Arrow Point Drive Cedar Park TX USA 78613 Cedar Park TX USA 78613 The products listed below are eligible to bear the CE mark Model 3301C Active Monopole Antenna APPLICABLE REQUIREMENTS Standard Criteria EMC Directive 2004 108 EC EN 61326 Electrical Equipment for Measurement Control and Laboratory Use EMC Requirements 1997 EN 55011 CISPR 11 1990 ed 2 Threshold values and measuring methods for radio interference by HF equipment for industrial scientific and medical purposes EN 61000 4 2 2009 Testing and measurement techniques for electrostatic discharge immunity test EN 61000 4 3 2006 A1 2008 Testing and measurement techniques for radiated radio frequency electromagnetic field immunity test EN 61000 4 4 Testing and measurement techniques for electrical fast transient burst immunity test EN 61000 4 5 Testing and measurement techniques for surge immunity test 61 Standard Criteria EN 61000 4 6 Testing and measurement techniques for immunity to conducted disturbances induced by radio frequency fields The Low Voltage Directive 2006 95 EEC EN 61010 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use General Requirements 2001 AUTHORIZED SIGNATORIES James C Psencik eneral
20. io of 3 dB N Several typical bandwidths are presented To calculate the expected sensitivity at another bandwidth a 10log relation should be used Example Determine the sensitivity with a 3 kHz bandwidth at 1 MHz minimum discernible signal MDS at 1 MHz with a 1 kHz bandwidth is read from the graph at 7 dBuV m e The ratio of the bandwidth is 3 123 Taking 10log 3 results in 4 77 dB Therefore the expected sensitivity would be 7 dBuV m 4 77dB 11 77dBuV m 39 ALARM SWITCHES When you turn on the Model 3301C the saturation and power lights gt will blink and an audible alarm will sound for five to eight seconds The Model 3301C is shipped with all active alarm DIP switches set to ON To change DIP switch settings to disable the beep see the steps on page 41 ON A bank of four DIP switches located the SW1 OFF designation on the system Alain board slide to control the Not Used audible settings for the Battery Low saturation and power Alarm Constant alarms Battery Low Alarm Intermittent Saturation Alarm Audible alarm for saturation condition Not Used Inactive Battery Low Alarm Constant Continuous audible alarm for power battery low condition Battery Low Alarm Intermittent Intermittent audible alarm for power battery low condition 40 CHANGE DIP SwiTCH SETTINGS Before performing these steps follow the safety information in the
21. mm Without center section 39 37 in 1000 mm 8 Insert the monopole through the hole in the counterpoise and into the antenna base Rotate the monopole to tighten 9 Connect the output of the unit to a 50 ohm receiver spectrum analyzer or RF voltmeter 10 Press the power switch to the left to turn on power to the Model 3301C The power LED displays green when the unit is on For complete information on the front panel controls and indicators see Operation on page 35 Assembly Instructions 27 MIL STD 461F Test Kit The MIL STD 461F Test Kit includes BNC cable 27 in e Ferrite bead e BNC bulkhead connector Right angle bracket Top of monopole Monopole centerline 41 0 in 1040 mm Counterpoise Bottom of antenna base 472 in 1200 mm Tripod or other support not included Attach ferrite bead at cable midpoint 23 6 in 600 mm Ground plane Ground plane 28 To assemble the MIL STD 461F Test Kit 1 Disconnect the Model 3301C from power 2 Attach the ferrite bead at the midpoint of the BNC cable 3 Attach the angle bracket to the ground plane screws not included 4 Plug the BNC cable into the Output on the Model 3301C 5 Plug the other end of the BNC cable into the BNC bulkhead connector in the right angle bracket 29 This page intentionally left blank 30 5 0 Mounting Instructions Before connecting any components follow the safety informa
22. nals which fall within the following boundaries e The product of the pulse width to pulse repetition rate must be greater than 0 003 The pulse repetition rate must be less than value listed for the applicable duty cycle See the following Table of Acceptable Pulse Repetition Rates TABLE OF ACCEPTABLE PULSE REPETITION RATES Duty Cycle Maximum PRF 10 19 7 MHz 20 14 0 MHz 30 9 2 MHz 40 5 6 MHz 50 420 0 kHz 60 130 0 kHz 70 87 0 2 80 57 0 2 90 30 0 2 20 Electrical Specifications Output Impedance 50 O nominal BNC Connector For 50 O cable Physical Specifications Length 19 05 cm 7 5 in Width 19 05 cm 7 5 in Height 8 89 cm 3 5 in Weight Antenna base only 1 4 kg 3 1 Ib Tripod Mounting 1 4 20 hole on the base Monopole Element Fora finished length of 40 95 in 1040 mm Assemble 2 116474 rod sections and 1 116862 For a finished length of 39 37 in 1000 mm Assemble 2 116474 rod sections Do not use the 116862 center section See page 26 for the steps to assemble the monopole 21 AC Adapter amp Battery Specifications 0 Battery Rechargeable AA Nickel Metal Hydride batteries 8 2000 mAH recommended Battery Charge Time Approximately 3 5 hours depending on charge level of batteries Battery Operating Time Typical Input Rating Nominal 90 265 VAC 50 60 Hz Approximately 30 hours Temperature Range 20 C to 40
23. on With Network Analyzer 47 8 0 Data lllustrations 49 Periodic Rectangular Pulse 49 Spectrum of Rectangular p Oe ver put ax 50 Altering Pulse Width Pulse Repetition 51 Active Electric Field Antenna Calibration 52 Active Monopole Antenna Calibration Setup 53 Typical Curves Typical Antenna Factors at the Default Switch Position PRG nc rm TT 54 Typical Curves Typical Maximum Noise Voltage Using 10 Hz Bandwidth 55 Typical Curves Typical Minimum Discernable Electric Field Levels dB uV m Under Different 56 Typical Antenna Factors for Different Switch Configurations 57 59 Appendix B EC Declaration of Conformity 61 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 follo
24. t off mode If the unit is switched on and the power LED is off the batteries may be depleted Charge or replace the batteries POWER SWITCH The power switch operates as an on off switch for Model 3301C and the battery charging function When you are using the Model 3301C the switch should be set to ON When the Model 3301 is off or you are charging the batteries the switch should be set to OFF CHG 37 Switches INTERNAL ATTENUATION Low FREQUENCY RoLL The Model 3301 is calibrated and shipped with all internal attenuation DIP switches set to OFF To change DIP switch settings see the steps on page 41 A bank of four DIP switches located at the SW2 designation on the system 10 dB Atten board slide to control the 30 dB Atten internal attenuation and the 1 9 kHz LF Roll Off low frequency roll off 22 0 kHz LF Roll Off 10 dB Atten Adds 10 dB of internal attenuation 10 30 dB Atten Adds 30 dB of internal attenuation 10 1 9 kHz LF Roll Off Sets the low frequency roll off of 3 dB down at 1 9 kHz 22 0 kHz LF Roll Off Sets the low frequency roll off of 3 dB down at 22 kHz Proper Selection of Internal Attenuation When dealing with continuous wave signals no attenuation is needed to measure field strengths below 0 8 V m At approximately this level the saturation indicator light will illuminate indicating a need to switch on the 10 dB attenuator When the 10 dB att
25. tching from 30 Hz to 50 MHz The 3 roll off points for the antenna factor are at 170 Hz and 30 MHz Between 250 Hz and 20 MHz the antenna factor is flat within 1 dB Despite the roll of the antenna factor the usable range is 30 Hz to 50 MHz The Model 3301 is designed for maximum sensitivity and dynamic range and is capable of sensing fields of 7 dBuV m at 1 MHz with a 1 kHz bandwidth However it will not saturate below field strength of 0 8 V m As a result the unit provides a wide dynamic range of 111 dB nominal at mid band In addition at 10 dB and 30 dB 10 internal attenuators enable the Model 3301C to be used in fields up to 25 V m expanding the dynamic range to 141 dB A saturation indicator provides an alert to the need for internal attenuators Standard Configuration ANTENNA BASE Grounding strips 2 1 4 20 mount Includes built in preamplifier output connector Base is drilled to accept ETS Lindgren or other tripod mount with standard 1 4 20 threads Four thumbscrew knobs used to secure the counterpoise to the metal grounding strips on the top of the antenna base are shipped attached to the grounding strips thumbscrews not shown in photo For a complete description of the Model 3301C controls switches and indicator lights see Operation on page 35 MONOPOLE ELEMENT The monopole element includes these parts for assembly 1 116474 Rod section without antenna
26. te 28 5 0 Mounting Instructions 31 4 Light Tripod Mounting 31 7 TR and Mast Mounting 32 2x2 Boom MOUNTING Options i n consue maa va n a nevada rua vo n au 33 6 0 OBerallOlis 35 Front Panel Controls and Indicators 35 Gharge LE 35 Charger Broken 36 SeltiraloEED he uada 36 OUTDUE CONMC COI 37 vip a 37 cO c Mo CD 37 PPS absens sc pai nece suc 38 For Internal Attenuation Low Frequency Roll Off 38 Alarm DIP 40 Change 41 Charging the Balterles 42 7 0 Calibrating the Model 33010C 43 Gallbrallori S t8 DS DD eee 43 Example of Antenna Factor Calculation 45 Model 3301 Calibration With Receiver and Signal Generator 46 Model 3301 Calibrati
27. tion in the ETS Lindgren Product Information Bulletin included with your shipment The Model 3301 is a precision measurement device Handle your antenna with care 4 TR Light Tripod Mounting Options Use the 1 4 20 mount on the bottom of the Model 3301C Active Monopole Antenna to mount directly onto an ETS Lindgren 4 TR Light Tripod no additional hardware is required 31 7 and Mast Mounting Options Following are options for mounting the Model 3301C 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 refers to 109042 108983 and 108507 booms 109042 boom Straight boom for general antenna mounting on a 7 108983 boom Offset boom for general antenna mounting on a 7 with pneumatic or manual polarization can also be used to mount stinger type antennas e 108507 boom For Model 3106 Series antennas only when changing polarization maintains centerline rotation 32 7 TR Mast To antenna mounting hole 104169 Boom Antenna Through boom on 7 TR Mast 2x2 Boom Mounting Options 2x2 boom refers to a typical 2 inch by 2 inch boom Following are options for mounting the Model 3301C onto a 2x2 boom Contact the ETS Lindgren Sales Department for information on ordering optional mounting hardware 2 2 OR
28. w instructions could result in SEVERE personal injury and or property damage Included text gives proper procedures See the ETS Lindgren Product Information Bulletin for safety 3 regulatory and other product marking information General Notices FCC Certifications This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 5 of the FCC Rules See the ETS Lindgren Product Information Bulletin for safety gt regulatory and other product marking information This page intentionally left blank vi 1 0 Introduction ETS Lindgren Model 3301C Active Monopole Antenna is a broadband high sensitivity electric field receiving antenna The Model 3301C is composed of Assembled monopole element e Monopole element e Counterpoise e Broadband high input impedance preamplifier Counterpoise The monopole and counterpoise function together as an electrically Antenna base short antenna over ground plane The preamplifier provides impedance MIL STD 461F Test Kit Includes BNC cable BNC bulkhead connector Ferrite bead Right angle bracket transformation from the high impedance at the base of the monopole to the 50 ohms required by most receiving systems and provides power gain to allow the sensing of low level signals The Model 3301C is designed to provide reception of an electric field in a signal band without tuning or band swi
29. y Replacement Atend of useful life please recycle the used batteries or dispose of them safely and properly Many cities collect used batteries for recycling or disposal You may contact your local waste disposal agency for information on battery recycling and disposal 1 Place the power switch in the OFF CHG position See Operation on page 35 for information on the front panel controls and indicators 2 Remove the monopole element and counterpoise See Counterpoise and Monopole Element on page 23 for more information 3 Disconnect all cables from the antenna base 13 4 Turn over the Model 3301C antenna base and place it on stable surface with the bottom facing up Remove the screws 8 from around the bottom of the base 5 Use a Phillips screwdriver to remove the eight screws from around the perimeter of the base and then lift the lid to remove it from the base 6 Lift and remove each battery from the battery holder 14 _ l NN E a 9 r 5 9 2 2 LM O x B 2 5 hes __ quem omm 2 22 C AC LS m m 2 5 Insert the end of the battery into the holder and then insert the end of the battery 7 Insert one new battery into each battery holder matching the on the battery with the on the board Slide the end of the battery into the appropriate end
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