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Introduction  

 

| 

7

 

1.0   Introduction 

The 

ETS-Lindgren 

Model 3301C Active 
Monopole Antenna

 is a 

broadband, high sensitivity 
electric-field receiving 
antenna. The Model 3301C is 
composed of: 

  Monopole element 

  Counterpoise 

  Broadband, high input 

impedance preamplifier 

The monopole and 
counterpoise function 
together as an electrically 
short antenna over ground 
plane. The preamplifier 
provides impedance 
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 switching from 30 Hz to 50 MHz. The 3 dB 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 /- 1 dB. Despite the roll of the antenna 
factor, the usable range is 30 Hz to 50 MHz. 

Содержание 3301C

Страница 1: ...Model 3301C Active Monopole Antenna User Manual Model 3301C Antenna Base ...

Страница 2: ...or the rights of others Copyright 2009 2016 by ETS Lindgren L P All 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 ROD ANTENNA USER Part 399792 Rev D Revision Description Date A Initial Release October 20...

Страница 3: ...ment 13 Annual Calibration 16 Replacement and Optional Parts 16 Service Procedures 17 3 0 Specifications 19 Operational Specifications 19 Table of Acceptable Pulse Repetition Rates 20 Electrical Specifications 21 Physical Specifications 21 AC Adapter Battery Specifications 22 4 0 Assembly Instructions 23 Counterpoise and Monopole Element 23 MIL STD 461F Test Kit 28 5 0 Mounting Instructions 31 4 T...

Страница 4: ...Network Analyzer 47 8 0 Data and Illustrations 49 Periodic Rectangular Pulse Train 49 Spectrum of Rectangular Pulse 50 Altering Pulse Width Pulse Repetition Rate 51 Active Electric Field Antenna Calibration Fixture 52 Active Monopole Antenna Calibration Setup 53 Typical Curves Typical Antenna Factors at the Default Switch Position All Off 54 Typical Curves Typical Maximum Noise Voltage Using 10 Hz...

Страница 5: ...to follow 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 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 ...

Страница 6: ...vi This page intentionally left blank ...

Страница 7: ...mplifier provides impedance 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 switching from 30 Hz to 50 MHz The 3 dB roll off points for the antenna factor ...

Страница 8: ...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 Includes built in preamplifier and BNC 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 t...

Страница 9: ...Rod section with antenna adapter 1 116862 Center section The monopole may be assembled as follows For a finished length of 40 95 in 1040 mm Assemble all parts including the 116862 center section For a finished length of 39 37 in 1000 mm Assemble all parts except for the 116862 center section See page 26 for the steps to assemble the monopole ...

Страница 10: ...l 3301C 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 a 27 in BNC cable BNC bulkhead conne...

Страница 11: ...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 lb load Model 3301C shown mounted with MIL STD 461F Test Kit onto 4 TR Light Tripod ...

Страница 12: ...uct 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 ...

Страница 13: ... 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 If the unit may be idle shelved and unused for more than a month remove the batteries and store them separately Check them before reinstalling them in the unit and install fresh batteri...

Страница 14: ... 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 and then lift the lid to remove it from the base 6 Lift and remove each battery from the battery holder ...

Страница 15: ... holder TIP To assist in inserting the battery into the holder you might need 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 them into service for the first time Failing to fully charge the batteries may result in reduced battery life and cause premature bat...

Страница 16: ...owing are the part numbers for ordering replacement or optional parts for the Model 3301C Active Monopole Antenna Part Description Part Number Monopole Element 116476 Monopole entire assembly 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 asse...

Страница 17: ...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 ...

Страница 18: ...18 Maintenance This page intentionally left blank ...

Страница 19: ...30 MHz Antenna Factor 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 Saturation Level 0 8 V m narrowband without attenuation 25 V m with 30 dB of internal attenuation selected 63 dBuV m MHz broadband saturation level Minimum Discernible Signal See data chart on page 56 For best sensitivity all internal attenuation should be turn...

Страница 20: ...f 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 kHz 80 57 0 kHz 90 30 0 kHz ...

Страница 21: ...7 5 in Height 8 89 cm 3 5 in Weight Antenna base only 1 4 kg 3 1 lb Tripod Mounting 1 4 20 hole on the base Monopole Element For a 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 ...

Страница 22: ...ately 3 5 hours depending on charge level of batteries Battery Operating Time Typical Approximately 30 hours Input Rating Nominal 90 265 VAC 50 60 Hz Adapter Output Power 20W Temperature Range 20ºC to 40ºC 4ºF to 104ºF 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 lb ...

Страница 23: ...ion 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 recommended that you use an electrostatic discharge ESD...

Страница 24: ... strips Slightly tighten the thumbscrew knobs There 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 ...

Страница 25: ... 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 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 ...

Страница 26: ...le the monopole element For a finished length of 40 95 in 1040 mm Assemble 2 116474 rod sections and 1 116862 center section For a finished length of 39 37 in 1000 mm Assemble 2 116474 rod sections Do not use the 116862 center section ...

Страница 27: ...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 ...

Страница 28: ...28 Assembly Instructions MIL STD 461F Test Kit The MIL STD 461F Test Kit includes BNC cable 27 in Ferrite bead BNC bulkhead connector Right angle bracket ...

Страница 29: ...C 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 ...

Страница 30: ...30 Assembly Instructions This page intentionally left blank ...

Страница 31: ...duct Information Bulletin included with your shipment The Model 3301C 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 ...

Страница 32: ...ing hardware Mast refers to 2070 Series 2075 and 2175 Antenna Towers 7 TR refers to 109042 108983 and 108507 booms 109042 boom Straight boom for general antenna mounting on a 7 TR 108983 boom Offset boom for general antenna mounting on a 7 TR with pneumatic or manual polarization can also be used to mount stinger type antennas 108507 boom For Model 3106 Series antennas only when changing polarizat...

Страница 33: ...m 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 ...

Страница 34: ...34 Mounting Instructions This page intentionally left blank ...

Страница 35: ...el 3301C the saturation and power lights will blink and an audible alarm will sound for five to eight seconds CHARGE STATUS LED State of LED Indicates No light off The AC adapter is not connected to the Model 3301C 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 to...

Страница 36: ...at 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 If saturation occurs apply internal attenuation by changing the DIP switch settings See DIP Switches on page 38 for mor...

Страница 37: ...d in this condition may be invalid Suspend testing and charge the batteries No light off Unit is in shut 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 ...

Страница 38: ...n at 22 kHz Proper Selection of Internal Attenuation When dealing with continuous wave CW 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 attenuator or 30 dB attenuator is switched on the Model 3301C can measure field strengths up t...

Страница 39: ...end impedance presented to the front end of the wideband amplifier The signal graphs provided in Data and Illustrations 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 result this forms the noise measurement for a signal plus noise to noise ratio of 3 dB ሺܵ ܰሻ ܰ Several typical bandwidths are presented To ca...

Страница 40: ...ch settings to disable the beep see the steps on page 41 A bank of four DIP switches located at the SW1 designation on the system board slide to control the audible settings for the saturation and power alarms 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 I...

Страница 41: ... 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...

Страница 42: ...failure If the unit may be idle shelved and unused for more than a month remove the batteries and store them separately Check them before reinstalling them in the unit and install fresh batteries if necessary 1 Move the power switch on the Model 3301C to OFF CHG if the power switch is set to ON the batteries will not charge 2 Connect the AC adapter to the electrical mains and then plug the adapter...

Страница 43: ...form 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 Calibration Steps Depending on the your calibration configuration see Model 3301C Calibration With Receiver and Signal Generator on page 46 or Model 3301C Calibration With Ne...

Страница 44: ...ort of the 3301CAL and a receiver on the receiver port 6 Terminate the output of the Model 3301C with 50 Ω 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 ...

Страница 45: ...put signal read from the output port on the Model 3301C Both readings are assumed to be logarithmic Example of Antenna Factor Calculation 1 The input read from the 3301CAL receiver port is 50 dBµV 2 The output read from the Model 3301C output port is 59 dBµV 3 The antenna factor is the input plus the combined fixture loss and effective height correction factor minus the output Assuming a reading i...

Страница 46: ...46 Calibrating the Model 3301C Model 3301 Calibration With Receiver and Signal Generator Attenuators may be required if VSWR of the receiver or signal generator is high ...

Страница 47: ...Calibrating the Model 3301C 47 Model 3301 Calibration With Network Analyzer Attenuators are not required with a network analyzer ...

Страница 48: ...48 Calibrating the Model 3301C This page intentionally left blank ...

Страница 49: ...Data and Illustrations 49 8 0 Data and Illustrations Periodic Rectangular Pulse Train ...

Страница 50: ...50 Data and Illustrations Spectrum of Rectangular Pulse Amplitudes and phases of an infinite number of harmonics are required to fully describe the envelope ...

Страница 51: ...e 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 ...

Страница 52: ...52 Data and Illustrations Active Electric Field Antenna Calibration Fixture ...

Страница 53: ...Data and Illustrations 53 Active Monopole Antenna Calibration Setup ...

Страница 54: ...54 Data and Illustrations Typical Curves Typical Antenna Factors at the Default Switch Position All Off ...

Страница 55: ...Data and Illustrations 55 Typical Curves Typical Maximum Noise Voltage Using 10 Hz Bandwidth ...

Страница 56: ...56 Data and Illustrations Typical Curves Typical Minimum Discernable Electric Field Levels dB uV m Under Different Bandwidths ...

Страница 57: ...Data and Illustrations 57 Typical Antenna Factors for Different Switch Configurations ...

Страница 58: ...58 Data and Illustrations This page intentionally left blank ...

Страница 59: ...e 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 ...

Страница 60: ...60 Warranty This page intentionally left blank ...

Страница 61: ...ICABLE 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 immunit...

Страница 62: ...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 Standard Criteria EN 61000 4 6 Testing and measurement techniques for immunity to conducted disturbances induced by radio frequency fields The Low Voltage Direct...

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