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TRRS #0050 - MFJ 266 Antenna Analyzer, Part 1
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MFJ Presentation: Antenna Analyzer Product Line PART 2 OF 3
MFJ Presentation: Antenna Analyzer Product Line PART 2 OF 3
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YouKits FG-01 Antenna analyzer
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Comet CAA-500 Antenna Analyzer
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Product video: R&S®ZVH Cable and Antenna Analyzer - for more efficiency in the field
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WD8DSB antenna analyzer (using VK5JST detector, linearization, and VFO circuits)
WD8DSB antenna analyzer (using VK5JST detector, linearization, and VFO circuits)
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Amateur Radio 2 Meter & 70 CM Testing With VHF/UHF Antenna Analyzer.wmv
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JDSU GenComm GC724A Cable and Antenna Analyzer AKA Protek A434 Potek RF MASTER 4GHZ
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MFJ Presentation: Antenna Analyzer Product Line PART 3 OF 3
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Times Technology T100+ Antenna Vector Impedance Analyzer.wmv
Times Technology T100+ Antenna Vector Impedance Analyzer.wmv
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Antenna analyzer with Arduino Nano
Antenna analyzer with Arduino Nano
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Antenna analyzer with Arduino uno with Color TFT
Antenna analyzer with Arduino uno with Color TFT
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AW07A ANTENNA ANALYZER BY PU2OKE
AW07A ANTENNA ANALYZER BY PU2OKE
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AW07A antenna analyzer images
AW07A antenna analyzer images
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HP 8920A Service Monitor and AW07A Antenna Analyzer
HP 8920A Service Monitor and AW07A Antenna Analyzer
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44
Microwave antenna alignment tutorial using handheld spectrum analyzer
Microwave antenna alignment tutorial using handheld spectrum analyzer
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WD8DSB Antenna Analyzer Demo
WD8DSB Antenna Analyzer Demo
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Anritsu Site Master S331E Cable Antenna Analyzer 1
Anritsu Site Master S331E Cable Antenna Analyzer 1
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47
ANTENNA ANALYZER METROVNA MEASURE FILTER
ANTENNA ANALYZER METROVNA MEASURE FILTER
::2014/04/23::
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48
Agilent FieldFox RF Analyzer N9912A as Cable and Antenna Analyzer, Line sweeping
Agilent FieldFox RF Analyzer N9912A as Cable and Antenna Analyzer, Line sweeping
::2012/01/18::
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49
MFJ-1786 on an Antenna Analyzer
MFJ-1786 on an Antenna Analyzer
::2012/03/18::
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50
HOMEBREW ANTENNA ANALYZER HF
HOMEBREW ANTENNA ANALYZER HF
::2012/07/09::
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From Wikipedia, the free encyclopedia
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An antenna analyzer measuring SWR and complex impedance of a dummy load. MFJ Enterprises Inc. MFJ-269.

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

Theory of operation[edit]

The antenna analyzer is essentially a bridge circuit where two legs are frequency-dependent complex-valued impedances. 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.

Unlike an SWR meter which measures the standing wave ratio in the cable feeding the antenna, a complex-impedance antenna analyzer requires little or no transmitted power applied to the antenna. The SWR meter works by measuring the reflected wave from the antenna back to the transmitter, which is minimal when the antenna is balanced. A badly tuned antenna can produce enough reflected power to damage the transmitter. Since an RX bridge can be used without transmitting, there is no risk of transmitter damage.[1][2]

Uses[edit]

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

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

See also[edit]

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