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Radio Frequency Interference
About radio frequency interference
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- Antenna Noise and Signal Cancelling at LF
- By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out. Circuitry is described which uses the signal from a wire antenna to provide selective cancelling against the signal output from an LF loop antenna.
- Toroid
- 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
- 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.
- QRM and noise reduction
- You will find on these pages my experiences and results on antennas and local/non-local QRM/noise reduction. Using a broadband vertical active magnetic loop and a home made / designed broadband amplifier. Two vertical magnetic Alford loops are used in an array.
Analog and Digital Signal Processing and a dual phase coherent Software Defined Radio (SDR) are used. By PA0SIM
- 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.
- 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.
- 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
- RF in shack with vertical and longwire antennas
- Why a vertical antenna or longwire antenna might require a balun
Alphabetical
- Television Interference - TVI
new
- VR2XMT article on TVI and how to solve interference problems
[Hits: 0 | Votes: 0 | Rating: 0.00] - 6m High Pass TVI filter
updated
- 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: 621 | Votes: 1 | Rating: 3.00] - A cheap noise reducing speaker
- Noise Reduction on the Cheap
[Hits: 602 | Votes: 0 | Rating: 0.00] - Alternators & Batteries
- Influence of batteiries on RFI and noise generation by k0bg
[Hits: 327 | Votes: 0 | Rating: 0.00] - Amateur Radio RF Safety Calculator
updated
- 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: 742 | Votes: 4 | Rating: 9.00] - Antenna Noise and Signal Cancelling at LF
- By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out. Circuitry is described which uses the signal from a wire antenna to provide selective cancelling against the signal output from an LF loop antenna.
[Hits: 3312 | Votes: 2 | Rating: 5.50] - ARRLWeb: Computer EMI
- How track and solve electrical interference from you computer
[Hits: 483 | Votes: 0 | Rating: 0.00] - ARRLWeb: Solving Ignition Noise RFI
- Solving Ignition Noise RFI article. Help on removing noise interfences caused by ignition
[Hits: 395 | Votes: 0 | Rating: 0.00] - Automotive RFI elimination
- ARRL pdf file on how remove car noise from your radio. Modern vehicles are RF noisy environments. Come learn how to identify and silence yor mobile noise sources, by WA6PDP
[Hits: 582 | Votes: 2 | Rating: 5.00] - Cellular Phone Interference
- Cellular Phone Interference and 800 MHz Public Safety Radio Systems: An Unforeseen and Dangerous Problem
[Hits: 416 | Votes: 0 | Rating: 0.00] - Common mode chokes
- Excellent article on limiting noise using chockes by Chuck Counselman, W1HIS
[Hits: 671 | Votes: 4 | Rating: 4.25] - 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: 214 | Votes: 0 | Rating: 0.00] - Electromagnetics, EMI, EMC, EME, RFI
- RADIOING eEngineer RFI EMI information
[Hits: 621 | 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: 317 | Votes: 0 | Rating: 0.00] - Eliminating RFI/EMI
- Suggested Steps To Help Eliminate RFI
[Hits: 416 | 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: 132 | Votes: 0 | Rating: 0.00] - EMI Calculator
- Does your Amateur Radio system comply to the EMI rules ? (German values implemented)
[Hits: 543 | Votes: 5 | Rating: 6.60] - EMI from Lamps
- Radio Frequency Interference To/From touch lamps and dimmers
[Hits: 363 | Votes: 0 | Rating: 0.00] - EMI from RF-Driven Lamps
- Information about RF driven lamps
[Hits: 224 | Votes: 0 | Rating: 0.00] - FCC interference handbook
- This is the electronic version of our "Interference to Home Electronic Entertainment Equipment Handbook"
[Hits: 553 | Votes: 2 | Rating: 5.50] - Ferrite on Reducing RFI
- Using ferrite to reduce radio frequency interference with your PC monitor or antennas with your receivers or transceivers.
[Hits: 876 | Votes: 0 | Rating: 0.00] - Filters for NDB reception
- RF Filters to help with NDB reception problems
[Hits: 519 | Votes: 0 | Rating: 0.00] - General Information about RFI/EMI
- RFI/EMI RadioFrequency interference/electromagnetic interference by
ARRL Technical Information Service page
[Hits: 2117 | 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: 920 | Votes: 1 | Rating: 5.00] - Ham Radio Online - Computer Networking RFI
- This page is to provide links to resources and information regarding technologies to reduce computer interference
[Hits: 359 | Votes: 1 | Rating: 1.00] - 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: 1894 | Votes: 1 | Rating: 1.00] - Importance of noise reduction in wires antennas
- An old post by John Doty about effects of noise in longwire antenna.
[Hits: 121 | 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: 950 | 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: 1456 | Votes: 1 | Rating: 9.00] - Interferences and filtering
- General information on Filter passbands, interferences, TVI and RFI problems
[Hits: 260 | Votes: 0 | Rating: 0.00] - K-Com -- Telephone RFI Filters
- Telephone RFI filters
[Hits: 411 | Votes: 2 | Rating: 5.00] - 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: 1628 | Votes: 3 | Rating: 9.33] - Line Isolator System
- A system view of the line isolator
[Hits: 530 | Votes: 0 | Rating: 0.00] - Noise Sources
- Computers, TV's, and Switching Systems can cause noises to your receiver
[Hits: 203 | 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: 666 | Votes: 0 | Rating: 0.00] - QRM and noise reduction
Priority listing
- You will find on these pages my experiences and results on antennas and local/non-local QRM/noise reduction. Using a broadband vertical active magnetic loop and a home made / designed broadband amplifier. Two vertical magnetic Alford loops are used in an array.
Analog and Digital Signal Processing and a dual phase coherent Software Defined Radio (SDR) are used. By PA0SIM
[Hits: 1955 | Votes: 4 | Rating: 8.00] - RF in shack with vertical and longwire antennas
- Why a vertical antenna or longwire antenna might require a balun
[Hits: 1390 | Votes: 2 | Rating: 4.00] - 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: 150 | Votes: 0 | Rating: 0.00] - RFI Archives
- RFI mailing list at contesting.com
[Hits: 292 | Votes: 0 | Rating: 0.00] - RFI From Computer Networks
- Is your router shutting you down ?
[Hits: 122 | 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: 2083 | Votes: 0 | Rating: 0.00] - 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: 199 | Votes: 0 | Rating: 0.00] - Sci.Electronics : RFI/EMI Info
- Dealing with Computer generated RFI/EMI by Daniel 9V1ZV
[Hits: 112 | 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: 177 | Votes: 1 | Rating: 1.00] - Telephone Interference
- Telephone EMI, questions and answers on how to solve interference problems to phone lines
[Hits: 525 | Votes: 0 | Rating: 0.00] - Television channel 11 interference.
- Solving interference from television channel 11 on 144MHz transverters by Chris Cox, NØUK, G4JEC
[Hits: 96 | Votes: 0 | Rating: 0.00] - 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: 748 | Votes: 1 | Rating: 5.00] - Toroid
updated
- 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: 2297 | Votes: 0 | Rating: 0.00] - TVI and BCI Filters
- TVI and BCI bandpass and bandstop filters in SMD technique. Schematics and images.
[Hits: 1580 | 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: 59 | 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: 599 | 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: 296 | Votes: 0 | Rating: 0.00] - Using ferrite for interference suppression
updated
- Excellent guide to using ferrite cores for interference suppression.
Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File
[Hits: 620 | 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: 1453 | Votes: 0 | Rating: 0.00] - VK5BR : Intermodulation
- Intermodulation Performance and Measurement of Intermodulation Components by Lloyd Butler VK5BR First published in "Amateur Radio" August 1997
[Hits: 141 | Votes: 0 | Rating: 0.00] - Where Does the Power Go
- An Energy Analysis at an Impedance Discontinuity in an RF Transmission Line
[Hits: 163 | Votes: 0 | Rating: 0.00]
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