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Radio Frequency Interference
About radio frequency interference
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- 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
- General Information about RFI/EMI
- RFI/EMI RadioFrequency interference/electromagnetic interference by
ARRL Technical Information Service page
- KØBG'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.
- RF in shack with vertical and longwire antennas
- Why a vertical antenna or longwire antenna might require a balun
- 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
- 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.
- 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
- 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
Alphabetical
- 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: 869 | Votes: 1 | Rating: 3.00] - A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing
- Understanding and solving RF interference problems using ferrite
[Hits: 99 | 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: 1798 | Votes: 11 | Rating: 7.54] - ARRLWeb: Computer EMI
- How track and solve electrical interference from you computer
[Hits: 694 | 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: 225 | Votes: 0 | Rating: 0.00] - Cellular Phone Interference
- Cellular Phone Interference and 800 MHz Public Safety Radio Systems: An Unforeseen and Dangerous Problem
[Hits: 574 | 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: 374 | Votes: 0 | Rating: 0.00] - Common mode chokes
- Excellent article on limiting noise using chockes by Chuck Counselman, W1HIS
[Hits: 1580 | Votes: 7 | Rating: 5.43] - 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: 386 | Votes: 1 | Rating: 10.00] - Electromagnetics, EMI, EMC, EME, RFI
- RADIOING eEngineer RFI EMI information
[Hits: 884 | Votes: 3 | Rating: 7.33] - 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: 620 | Votes: 1 | Rating: 10.00] - Eliminating RFI/EMI
- Suggested Steps To Help Eliminate RFI
[Hits: 986 | 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: 606 | Votes: 0 | Rating: 0.00] - EMI Calculator
- Does your Amateur Radio system comply to the EMI rules ? (German values implemented)
[Hits: 771 | Votes: 6 | Rating: 6.67] - EMI from Lamps
- Radio Frequency Interference To/From touch lamps and dimmers
[Hits: 493 | Votes: 0 | Rating: 0.00] - EMI from RF-Driven Lamps
- Information about RF driven lamps
[Hits: 316 | Votes: 0 | Rating: 0.00] - FCC interference handbook
- This is the electronic version of our "Interference to Home Electronic Entertainment Equipment Handbook"
[Hits: 754 | 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: 622 | Votes: 0 | Rating: 0.00] - Ferrite for RFI
- Ferrite cores for RFI Suppression
[Hits: 131 | 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: 1311 | 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: 314 | Votes: 0 | Rating: 0.00] - Filters for NDB reception
- RF Filters to help with NDB reception problems
[Hits: 683 | Votes: 0 | Rating: 0.00] - General Information about RFI/EMI
- RFI/EMI RadioFrequency interference/electromagnetic interference by
ARRL Technical Information Service page
[Hits: 2909 | Votes: 1 | 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: 2404 | Votes: 3 | Rating: 5.67] - Ham Radio Online - Computer Networking RFI
- This page is to provide links to resources and information regarding technologies to reduce computer interference
[Hits: 498 | Votes: 1 | Rating: 1.00] - Homebew RF chocke
- RF Choke to prevent hf currents on the feedline
[Hits: 519 | Votes: 0 | Rating: 0.00] - 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: 157 | Votes: 0 | Rating: 0.00] - 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: 7820 | Votes: 9 | Rating: 4.77] - Importance of noise reduction in wires antennas
- An old post by John Doty about effects of noise in longwire antenna.
[Hits: 568 | 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: 1193 | 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: 2435 | Votes: 1 | Rating: 9.00] - Interferences and filtering
- General information on Filter passbands, interferences, TVI and RFI problems
[Hits: 494 | 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: 158 | Votes: 1 | Rating: 10.00] - K-Com -- Telephone RFI Filters
- Telephone RFI filters
[Hits: 649 | Votes: 4 | Rating: 6.25] - KØBG'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: 2741 | Votes: 7 | Rating: 8.29] - Line Isolator System
- A system view of the line isolator
[Hits: 972 | Votes: 1 | Rating: 10.00] - Magnets dissipate RF noise
- How magnets can help on reducing RFI
[Hits: 98 | Votes: 0 | Rating: 0.00] - Phasing out Interference
- Phasing out interference, another look
[Hits: 34 | Votes: 0 | Rating: 0.00] - Power Line Noise
- I have a shortwave radio, but I get nothing but a loud buzzing on it. What's wrong?
[Hits: 1001 | Votes: 0 | Rating: 0.00] - Resolving 6 Meter Amateur Interference
- Transmitting operations in the 50-54 MHz range offer some unique problems that over the past 50 years have stymied station owners, forcing them to tolerate quiet hours and hostility from family and neighbors attempting to enjoy other electronic services.
[Hits: 9 | Votes: 0 | Rating: 0.00] - RF in shack with vertical and longwire antennas
- Why a vertical antenna or longwire antenna might require a balun
[Hits: 2617 | Votes: 3 | Rating: 6.00] - RFI - Intermodulation
- Getting squeaks and squawks from your H-T? Are pagers crunching your mobile rig's front end? Here's how intermod happens--and how to fight back!
[Hits: 262 | Votes: 2 | Rating: 5.50] - RFI Archives
- RFI mailing list at contesting.com
[Hits: 396 | Votes: 0 | Rating: 0.00] - RFI From Computer Networks
- Is your router shutting you down ?
[Hits: 245 | Votes: 0 | Rating: 0.00] - 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.
[Hits: 3756 | Votes: 1 | Rating: 1.00] - Safety: RF awarness guidelines
- Although Amateur Radio is basically a safe activity, in recent years there has been considerable discussion and concern about
the possible hazards of electromagnetic radiation (EMR), including both RF energy and power frequency (50-60 Hz) electromagnetic fields. This section summarizes what is now known and offers safety precautions based on the research to date.
[Hits: 298 | Votes: 0 | Rating: 0.00] - Sci.Electronics : RFI/EMI Info
- Dealing with Computer generated RFI/EMI by Daniel 9V1ZV
[Hits: 260 | Votes: 0 | Rating: 0.00] - Simple anti-static device
- With all the wire you have out, you may run into a problem with static buildup on the antennas. This static may try to make its way into your receiver, causing you major problems and damage that can run into a lot of money.
[Hits: 419 | Votes: 1 | Rating: 1.00] - Telephone Interference
- Telephone EMI, questions and answers on how to solve interference problems to phone lines
[Hits: 673 | Votes: 0 | Rating: 0.00] - Television channel 11 interference.
- Solving interference from television channel 11 on 144MHz transverters by Chris Cox, NØUK, G4JEC
[Hits: 202 | Votes: 1 | Rating: 1.00] - Television Interference - TVI
- VR2XMT article on TVI and how to solve interference problems
[Hits: 172 | Votes: 2 | Rating: 5.50] - 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
[Hits: 1910 | Votes: 1 | Rating: 5.00] - 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
[Hits: 3631 | Votes: 10 | Rating: 3.20] - Track down television interference
- Nearly half of all reception problems are due to deficiencies or faults in the television receiver, the aerial lead or the aerial. This article will help you to check whether the problem you are having is due to one of these causes.
[Hits: 118 | Votes: 0 | Rating: 0.00] - TVI and BCI Filters
- TVI and BCI bandpass and bandstop filters in SMD technique. Schematics and images.
[Hits: 2470 | Votes: 4 | Rating: 5.00] - TVi Basics - making filters
- TV Interference filters, making TVI filters, coaxial filters to eliminate TV interferences caused by radio frequency
[Hits: 371 | Votes: 0 | Rating: 0.00] - TVI filters
- These filters are in use by hundreds of VHF weak signal operators and have been proven to be an
effective solution for fundamental overload problems.
[Hits: 751 | Votes: 1 | Rating: 7.00] - UHF Reject filter
- This filter is a 0.1 dB Tschebychev lowpass with a rejection of 90 dB
or better at 430 MHz, and 0.2 dB insertion loss at 72 MHz.
[Hits: 633 | Votes: 1 | Rating: 10.00] - 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
[Hits: 2287 | Votes: 1 | Rating: 8.00] - VK5BR : Intermodulation
- Intermodulation Performance and Measurement of Intermodulation Components by Lloyd Butler VK5BR First published in "Amateur Radio" August 1997
[Hits: 254 | Votes: 1 | Rating: 10.00] - Where Does the Power Go
- An Energy Analysis at an Impedance Discontinuity in an RF Transmission Line
[Hits: 352 | Votes: 3 | Rating: 10.00]
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