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Ask Dave Episode 1: Antenna Analyzers
Ask Dave Episode 1: Antenna Analyzers
Published: 2015/06/12
Channel: David Casler
How To Use An Antenna Analyzer - Basics
How To Use An Antenna Analyzer - Basics
Published: 2015/03/26
Channel: K7AGE
MFJ-269c antenna analyzer
MFJ-269c antenna analyzer
Published: 2016/02/16
Channel: HamRadioConcepts
Antenna Analyzer Roundup
Antenna Analyzer Roundup
Published: 2012/01/06
Channel: ARRLHQ
DIY No Frills AD9850/Arduino Antenna Analyzer
DIY No Frills AD9850/Arduino Antenna Analyzer
Published: 2015/08/03
Channel: jmhrvy1947
How to use an antenna analyzer
How to use an antenna analyzer
Published: 2017/05/07
Channel: Ray Anderson
Mini60 Antenna Analyzer
Mini60 Antenna Analyzer
Published: 2015/01/04
Channel: Anton Janovsky
Low-cost Antenna Analyzer 1hz~3ghz
Low-cost Antenna Analyzer 1hz~3ghz
Published: 2015/04/11
Channel: Terence Chan
Mini60 Antenna Analyzer Android  Quick Start Guide Ham Radio
Mini60 Antenna Analyzer Android Quick Start Guide Ham Radio
Published: 2017/04/25
Channel: OH8STN
AA30 Antenna Analyser
AA30 Antenna Analyser
Published: 2013/11/01
Channel: Paul Holland
N1201SA Antenna Analyser Review
N1201SA Antenna Analyser Review
Published: 2017/01/18
Channel: Capt Science
Airspy SDR as a Network Analyzer using for Antenna Characterization
Airspy SDR as a Network Analyzer using for Antenna Characterization
Published: 2016/07/17
Channel: Mile Kokotov
Arduino Antenna Analyzer -- A Look Inside
Arduino Antenna Analyzer -- A Look Inside
Published: 2017/11/14
Channel: Michael Graves
Arduino Antenna Analyzer Review
Arduino Antenna Analyzer Review
Published: 2017/06/25
Channel: Michael Graves
RigExpert AA-54 antenna analyzer demo
RigExpert AA-54 antenna analyzer demo
Published: 2013/01/23
Channel: VE2XIP
Use an Antenna Analyzer WITH your Manual Antenna Tuner for maximum results - AF5DN
Use an Antenna Analyzer WITH your Manual Antenna Tuner for maximum results - AF5DN
Published: 2013/09/29
Channel: MeOnTech
Rigexpert AA-230 Zoom antenna analyzer review
Rigexpert AA-230 Zoom antenna analyzer review
Published: 2015/11/24
Channel: HamRadioConcepts
SARK100 Antenna Analyzer
SARK100 Antenna Analyzer
Published: 2013/06/15
Channel: Mike Clark
How to use SURECOM Antenna Analyzer SA-250
How to use SURECOM Antenna Analyzer SA-250
Published: 2016/06/01
Channel: 409shop409
MFJ-226 Graphical impedance antenna analyzer review demo
MFJ-226 Graphical impedance antenna analyzer review demo
Published: 2015/05/24
Channel: HamRadioConcepts
Basics of Using an MFJ Antenna Analyzer by W5LA
Basics of Using an MFJ Antenna Analyzer by W5LA
Published: 2014/08/14
Channel: Jim Ragsdale
MFJ-226 Antenna Analyzer
MFJ-226 Antenna Analyzer
Published: 2016/09/14
Channel: ARRLHQ
Rigexpert AA-1000 antenna analyzer review demo
Rigexpert AA-1000 antenna analyzer review demo
Published: 2015/03/11
Channel: HamRadioConcepts
K6UDA Radio - SARK 110 the coolest little antenna analyzer in the world?
K6UDA Radio - SARK 110 the coolest little antenna analyzer in the world?
Published: 2016/04/30
Channel: K6UDA
Comet CAA500 Mark II Antenna Analyzer
Comet CAA500 Mark II Antenna Analyzer
Published: 2016/09/14
Channel: ARRLHQ
The amazing FG-01 Antenna Analyzer!
The amazing FG-01 Antenna Analyzer!
Published: 2012/01/17
Channel: The Radio Hobbyist
MR100 Antenna Analyzer Review
MR100 Antenna Analyzer Review
Published: 2016/11/14
Channel: Radio Prepper
AW07A antenna analyzer
AW07A antenna analyzer
Published: 2014/11/28
Channel: AC9BX Eric
SARK-110 Antenna Analyzer Tour
SARK-110 Antenna Analyzer Tour
Published: 2013/12/08
Channel: Melchor Varela
Universal Radio presents the Comet CAA-500 Mk II Antenna Analyzer
Universal Radio presents the Comet CAA-500 Mk II Antenna Analyzer
Published: 2016/01/21
Channel: UniversalRadioInc
YouKits FG 01 Antenna Analyzer Used to Test a 40m Whip Antenna
YouKits FG 01 Antenna Analyzer Used to Test a 40m Whip Antenna
Published: 2017/03/27
Channel: James Eagleson
MINI60 antenna analyzer
MINI60 antenna analyzer
Published: 2015/06/06
Channel: Lukeoid
Sark100 Antenna Analyzer Repair
Sark100 Antenna Analyzer Repair
Published: 2017/02/17
Channel: AERVBlog
watson antenna analyzer
watson antenna analyzer
Published: 2016/10/31
Channel: shaneweightman
MFJ-226 Graphical Impedance Antenna Analyzer - Full Review
MFJ-226 Graphical Impedance Antenna Analyzer - Full Review
Published: 2017/09/24
Channel: Laboenligne.ca
MFJ-213 SWR Antenna Analyzer, basic operation ( funciones de swr )
MFJ-213 SWR Antenna Analyzer, basic operation ( funciones de swr )
Published: 2015/04/18
Channel: xxGR25xx
How to Test MD390VHF Antenna By SA-250 Surecom Antenna Analyzer!
How to Test MD390VHF Antenna By SA-250 Surecom Antenna Analyzer!
Published: 2016/06/15
Channel: 409shop409
SA250 Antenna Analyzer how to scan
SA250 Antenna Analyzer how to scan
Published: 2016/02/26
Channel: 409shop409
MFJ-269C Testing coax cable faults and length
MFJ-269C Testing coax cable faults and length
Published: 2017/04/28
Channel: HamRadioConcepts
Antenna analyzer
Antenna analyzer
Published: 2016/05/20
Channel: Neagu Daniel
How To Make A Coupling Loop For The FG-01 Antenna Analyser
How To Make A Coupling Loop For The FG-01 Antenna Analyser
Published: 2017/03/31
Channel: VK6CS
Using an MFJ-259B Antenna Analyzer
Using an MFJ-259B Antenna Analyzer
Published: 2013/03/29
Channel: Stanley Coutant
MFJ 259C Antenna Analyzer– Back from MFJ Service Repair
MFJ 259C Antenna Analyzer– Back from MFJ Service Repair
Published: 2016/05/23
Channel: W5CYF / TinkerJohn
#0082 MR100 SWR Antenna Analyzer (Parte 1 instalación)
#0082 MR100 SWR Antenna Analyzer (Parte 1 instalación)
Published: 2016/09/28
Channel: XQ2CG Sergio
Analizador de Antena Feature Tech AW07A Antenna analyzer AKA MFJ-266
Analizador de Antena Feature Tech AW07A Antenna analyzer AKA MFJ-266
Published: 2012/10/02
Channel: spymsn
#0085 Parte 3. MFJ 259B versus MR100 SWR Antenna Analyzer
#0085 Parte 3. MFJ 259B versus MR100 SWR Antenna Analyzer
Published: 2016/10/14
Channel: XQ2CG Sergio
Arduino Antenna Analyzer with AD9850
Arduino Antenna Analyzer with AD9850
Published: 2017/07/31
Channel: HA8MZ
AW07A ANTENNA ANALYZER BY PU2OKE
AW07A ANTENNA ANALYZER BY PU2OKE
Published: 2014/07/15
Channel: PU2OKE
MR100 Antenna Analyzer Calibration
MR100 Antenna Analyzer Calibration
Published: 2016/11/14
Channel: Radio Prepper
MFJ-269 Antenna Analyzer Test with 4-stack and X510N
MFJ-269 Antenna Analyzer Test with 4-stack and X510N
Published: 2014/03/11
Channel: nokiaman2002
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WIKIPEDIA ARTICLE

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An antenna analyzer measuring SWR and complex impedance of a dummy load. MFJ Enterprises Inc. MFJ-269.

An antenna analyzer or in British aerial analyser (also known as a noise bridge, RX bridge, SWR analyzer, or RF analyzer) is a device used for measuring the input impedance of antenna systems in radio electronics applications.

Types of analysers[edit]

Antenna bridge[edit]

A bridge circuit has two legs which are frequency-dependent complex-valued impedances. One leg is a circuit in the analyzer with calibrated components whose combined impedance can be read on a scale. The other leg is the unknown – either an antenna or a reactive component.

To measure impedance, the bridge is adjusted, so that the two legs have the same impedance. When the two impedances are the same, the bridge is balanced. Using this circuit it is possible to either measure the impedance of the antenna connected between ANT and GND, or it is possible to adjust an antenna, until it has the same impedance as the network on the left side of the diagram below. The bridge can be driven either with white noise or a simple carrier (connected to drive). In the case of white noise the amplitude of the exciting signal can be very low and a radio receiver used as the detector. In the case where a simple carrier is used then depending on the level either a diode detector or a receiver can be used. In both cases a null will indicate when the bridge is balanced.

A typical antenna bridge, the trimmer capacitor (C) is adjusted to make the bridge balance when the variable capacitor on the left is half meshed. Hence the bridge will be able to detect if an antenna is either a capacitive or inductive load.

Complex Voltage and Current meters[edit]

A second type of antenna analyzer measures the complex voltage across and current into the antenna. It then uses mathematical methods to calculate complex impedance and display it in either on a calibrated meter or a digital display. Professional instruments of this type are usually called network analyzers. This type of analyzer does not require the operator to adjust any R and X knobs as with the bridge type analyzer. Many of these instruments have the ability to sweep the frequency and thus plot the antenna characteristics over a wide range. Doing this with a manually operated bridge would be time consuming, requiring one to change the frequency and adjust the knobs at each frequency for a null.

High and low power methods[edit]

Many transmitters include an SWR meter in the output circuits which works by measuring the reflected wave from the antenna back to the transmitter, which is minimal when the antenna is matched. Reflected power from a badly tuned antenna can present an improper load at the transmitter which can damage it. A complex-impedance antenna analyzer typically requires only a few milliwatts of power be applied to the antenna. This avoids possible damage to the transmitter when the antenna is badly tuned.[1][2] In addition, if the power is very low, the analyzer can be used outside of the frequency bands licensed to the transmitter operator and thus get data on the antenna performance over a range of frequencies.

Uses[edit]

In radio communications systems, including amateur radio, an antenna analyzer is a common tool used for troubleshooting antennas and feedlines as well as fine tuning their performance.[3]

Antenna bridges have long been used in the broadcast industry to tune antennas. A bridge is available which measures complex impedance while the transmitter is operating, practically a necessity when tuning multi tower antenna systems.[4] In more recent times the direct reading network analyzers have become more common.

See also[edit]

References[edit]

  1. ^ Practical Radio Frequency Test and Measurement: A Technician's Handbook by Joseph J. Carr, P. 319. Published by Newnes, 1999. ISBN 0-7506-7161-0, ISBN 978-0-7506-7161-3
  2. ^ Secrets of RF Circuit Design by Joseph J. Carr, Chapter 17, Building and using the RF noise bridge. ISBN 0-07-137067-6
  3. ^ The ARRL Handbook for Radio Communications 2007: The Comprehensive RF Engineering Reference by Mark J. Wilson, Dana G. Reed. Published by American Radio Relay League, ISBN 0-87259-976-0, ISBN 978-0-87259-976-5
  4. ^ Battison, John. "Using the operating impedance bridge". Radio, The Radio Technology Leader. New Bay Media. Retrieved 20 July 2016. 

Further reading[edit]

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