Radio Frequency Interference

About radio frequency interference

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Home : Technical Reference : Radio Frequency Interference

  • BPL (33)
  • Noise Reduction (23)
  • PLT (3)
    Most Popular
    • Idiot's guide to coaxial cable - A very beginner's guide to coax cables. Characteristics, detailed comparison of typical coaxial cables, commonly used connectors, and a few words about SWR.
    • RFI Information Page - This page gives information about Radio Frequency Interference, the unwanted reception of radio signals. You'll find out how to determine what is at fault (the transmitter or the receiver) and what you can do in either case.
    • Toroid Pro - Designed by microwave engineers to provide filter, radio,microwave and Ham radio engineers with all relevant information of an inductor and core at his or her finger tips
    • Grounding and RFI - Described system was designed to provide a high level of lightning protection - there are three levels of defense to guard against let-through. It isn't perfect, but does, however, follow good guidelines and shows measured improvements in RFI reduction.
    • Amateur Radio RF Safety Calculator - University of Texas Amateur Radio Club RF-Calculator. This is a main beam power density estimation program intended for use as part of a routine evaluation of RF safety compliance with FCC regulations
    • RF in shack with vertical and longwire antennas - Why a vertical antenna or longwire antenna might require a balun
    • KBG's ham radio mobile operator web site - This site is dedicated to mobile amateur radio operators, old and new alike. Whether you are into HF, or VHF operation, I trust the information presented will increase your enjoyment of our great hobby. With safety as a byword, there are articles on amplifiers, antennas, bonding, impedance matching, installing hardware, mobile equipment, noise and RFI abatement, wiring, and much more. I do my best to keep these articles up to date, and easy to follow.
    • General Information about RFI/EMI - RFI/EMI RadioFrequency interference/electromagnetic interference by ARRL Technical Information Service page
    • TVI and BCI Filters - TVI and BCI bandpass and bandstop filters in SMD technique. Schematics and images.
    • Interference Handbook - Interference to home electronic equipment is a frustrating problem; but, fortunately, there are several ways to deal with it. This handbook provides a step-by-step process for eliminating the interference
    • Using ferrites for interference suppression - This tutorial is meant to shed some light on the use of ferrites, and also presents some comparative frequency domain measurements both to illustrate some of the points, and to give designers an idea of what they might expect in using and specifying a ferrite component
    • The "Woodpecker" Tuning aid - This little gadget is that it allows you to tune up at full peak output power, whilst limiting the average power to a fraction of the peak, thereby protecting the PA from meltdown
    • Common mode chokes - Excellent article on limiting noise using chockes by Chuck Counselman, W1HIS
    • Homebew RF chocke - RF Choke to prevent hf currents on the feedline
    • Ferrite on Reducing RFI - Using ferrite to reduce radio frequency interference with your PC monitor or antennas with your receivers or transceivers.
    • 6m High Pass TVI filter - Are you suffering from TVI? Then why not try this filter for size. It is a three-stage high-pass filter that blocks low-frequency 50MHz signals while letting through UHF TV.
      [ Hits: 1296 | Votes: 2 | Rating: 3.00 ]
    • A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing - Understanding and solving RF interference problems using ferrite
      [ Hits: 826 | Votes: 4 | Rating: 9.25 ]
    • Amateur Radio Interference - AB4D answer on an article talking incorrectly about ham radio interferences
      [ Hits: 138 | Votes: 1 | Rating: 10.00 ]
    • Amateur Radio RF Safety Calculator - University of Texas Amateur Radio Club RF-Calculator. This is a main beam power density estimation program intended for use as part of a routine evaluation of RF safety compliance with FCC regulations
      [ Hits: 5076 | Votes: 22 | Rating: 7.50 ]
    • ARRLWeb: Computer EMI - How track and solve electrical interference from you computer
      [ Hits: 1037 | Votes: 0 | Rating: 0.00 ]
    • Automotive Interference Problems - Installing mobile radios in your new megabucks car can be a frightening proposition - especially if RF from your rig could damage your shiny new roadster
      [ Hits: 649 | Votes: 0 | Rating: 0.00 ]
    • Cellular Phone Interference - Cellular Phone Interference and 800 MHz Public Safety Radio Systems: An Unforeseen and Dangerous Problem
      [ Hits: 798 | Votes: 0 | Rating: 0.00 ]
    • Choking on RF - The intrepid newcomer encounters common mode problems in a mobile environment. Implementing some common mode chokes will be possible to reduce interferences
      [ Hits: 966 | Votes: 0 | Rating: 0.00 ]
    • Common mode chokes  updated - Excellent article on limiting noise using chockes by Chuck Counselman, W1HIS
      [ Hits: 3407 | Votes: 11 | Rating: 5.18 ]
    • Common sources of QRM  updated - Article on common sources of radio interference (QRM)
      [ Hits: 105 | Votes: 1 | Rating: 1.00 ]
    • Detuning Towers - The goal of detuning is not to avoid resonance, but rather to minimize re-radiation and/or current in the interfering structure.
      [ Hits: 606 | Votes: 1 | Rating: 10.00 ]
    • Electromagnetics, EMI, EMC, EME, RFI - RADIOING eEngineer RFI EMI information
      [ Hits: 1416 | Votes: 6 | Rating: 6.33 ]
    • Eliminate QRM from 6 meters band - The circuit described below will substantially reduce or completely eliminate interference from almost any local source whilst leaving the wanted signal relatively unaffected, even though it may be on the same frequencey by TREVOR, G3ZYY
      [ Hits: 1077 | Votes: 1 | Rating: 10.00 ]
    • Eliminating RFI/EMI - Suggested Steps To Help Eliminate RFI
      [ Hits: 1888 | Votes: 0 | Rating: 0.00 ]
    • Eliminating TX RF Feedback Problems - Malfunction of transceivers due to stray RF pickup is a common problem, especially when using end-fed antennas, high-impedance feedlines, or a poor ground counterpoise
      [ Hits: 1646 | Votes: 1 | Rating: 1.00 ]
    • EMI Calculator - Does your Amateur Radio system comply to the EMI rules ? (German values implemented)
      [ Hits: 1145 | Votes: 7 | Rating: 7.15 ]
    • EMI from Lamps - Radio Frequency Interference To/From touch lamps and dimmers
      [ Hits: 762 | Votes: 1 | Rating: 6.00 ]
    • EMI from RF-Driven Lamps - Information about RF driven lamps
      [ Hits: 525 | Votes: 0 | Rating: 0.00 ]
    • FCC interference handbook - This is the electronic version of our "Interference to Home Electronic Entertainment Equipment Handbook"
      [ Hits: 1073 | Votes: 3 | Rating: 4.00 ]
    • Feeder Radiation - Connecting centre fed antennas, dipoles, yagis, rhombics, loops to coaxial cable, unless care is taken, it is not difficult to end up with feeder radiation resulting in power loss and the radiation characteristics changes
      [ Hits: 1534 | Votes: 1 | Rating: 1.00 ]
    • Ferrite for RFI - Ferrite cores for RFI Suppression
      [ Hits: 483 | Votes: 0 | Rating: 0.00 ]
    • Ferrite on Reducing RFI - Using ferrite to reduce radio frequency interference with your PC monitor or antennas with your receivers or transceivers.
      [ Hits: 1910 | Votes: 0 | Rating: 0.00 ]
    • Filters and Ferrites in EMC - This article is about the characteristics and use of various filters and ferrites for solving amateur radio electromagnetic compatibility problems involving breakthrough of amateur signals into domestic equipment such as television sets, video recorders stereo sytems etc.
      [ Hits: 729 | Votes: 0 | Rating: 0.00 ]
    • Filters for NDB reception - RF Filters to help with NDB reception problems
      [ Hits: 977 | Votes: 1 | Rating: 10.00 ]
    • Find RFI causes in mobile operations - Troubleshooting your power supply, in determinig connections to battery, alternator and regulator interference and checking power supply leads.
      [ Hits: 239 | Votes: 0 | Rating: 0.00 ]
    • General Information about RFI/EMI - RFI/EMI RadioFrequency interference/electromagnetic interference by ARRL Technical Information Service page
      [ Hits: 4076 | Votes: 2 | Rating: 2.00 ]
    • Grounding and RFI - Described system was designed to provide a high level of lightning protection - there are three levels of defense to guard against let-through. It isn't perfect, but does, however, follow good guidelines and shows measured improvements in RFI reduction.
      [ Hits: 5336 | Votes: 4 | Rating: 4.75 ]
    • Guide to RFI - A amateur radio guide to RFI, ferrites, baluns, and audio interfacing by K9YC
      [ Hits: 171 | Votes: 1 | Rating: 10.00 ]
    • Half-wave Antenna Myths - Why you should consider operating only QRP during Field Day
      [ Hits: 218 | Votes: 1 | Rating: 10.00 ]
    • Ham Radio Online - Computer Networking RFI - This page is to provide links to resources and information regarding technologies to reduce computer interference
      [ Hits: 682 | Votes: 3 | Rating: 1.00 ]
    • Homebew RF chocke - RF Choke to prevent hf currents on the feedline
      [ Hits: 2662 | Votes: 2 | Rating: 10.00 ]
    • IARU Monitoring System sound files - IARU Region 1 Monitoring System, local QRM, PSK and FSK systems, radars, beacons, scrambles and illegal voice traffic recordings
      [ Hits: 691 | Votes: 0 | Rating: 0.00 ]
    • Identifying sources of radio frequency interference - This page describes the results of some tests with a portable spectrum analyzer in attempt to identify the sources of RFI around the house. Radio interference was found in a number of unexpected places.
      [ Hits: 549 | Votes: 1 | Rating: 8.00 ]
    • Idiot's guide to coaxial cable - A very beginner's guide to coax cables. Characteristics, detailed comparison of typical coaxial cables, commonly used connectors, and a few words about SWR.
      [ Hits: 19186 | Votes: 23 | Rating: 5.31 ]
    • Importance of noise reduction in wires antennas - An old post by John Doty about effects of noise in longwire antenna.
      [ Hits: 1389 | Votes: 0 | Rating: 0.00 ]
    • Ingnition notes on RFI by K0BG - Removing noise caused by ignition and injection systems
      [ Hits: 141 | Votes: 0 | Rating: 0.00 ]
    • Interference Cancelling System - The use of interference signal cancellation has been around for some time. The idea is to use an auxiliary antenna almost any random length of wire in addition to the main receiving antenna
      [ Hits: 1614 | Votes: 1 | Rating: 3.00 ]
    • Interference Handbook - Interference to home electronic equipment is a frustrating problem; but, fortunately, there are several ways to deal with it. This handbook provides a step-by-step process for eliminating the interference
      [ Hits: 3867 | Votes: 2 | Rating: 5.50 ]
    • Interferences and filtering - General information on Filter passbands, interferences, TVI and RFI problems
      [ Hits: 1011 | Votes: 1 | Rating: 10.00 ]
    • Intermodulation - Intermodulation distortion, commonly known as Intermods, is a type of interference that can occur in any non-linear junction.
      [ Hits: 360 | Votes: 1 | Rating: 10.00 ]
    • KBG's ham radio mobile operator web site - This site is dedicated to mobile amateur radio operators, old and new alike. Whether you are into HF, or VHF operation, I trust the information presented will increase your enjoyment of our great hobby. With safety as a byword, there are articles on amplifiers, antennas, bonding, impedance matching, installing hardware, mobile equipment, noise and RFI abatement, wiring, and much more. I do my best to keep these articles up to date, and easy to follow.
      [ Hits: 4336 | Votes: 9 | Rating: 8.56 ]
    • Line Isolator System - A system view of the line isolator
      [ Hits: 1486 | Votes: 1 | Rating: 10.00 ]
    • Magnets dissipate RF noise - How magnets can help on reducing RFI
      [ Hits: 389 | Votes: 0 | Rating: 0.00 ]
    • Phasing out Interference - Phasing out interference, another look
      [ Hits: 259 | Votes: 2 | Rating: 3.00 ]
    • Power Line Noise - I have a shortwave radio, but I get nothing but a loud buzzing on it. What's wrong?
      [ Hits: 1555 | Votes: 0 | Rating: 0.00 ]
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