noise filter

RFI From Computer Equipment - Recordings of RF noise from personal computers, peripherals and related equipment. If you can match noise at your location to one of these files then you can be confident that you know where your noise is coming from.

I0JXX - The I0JXX is an italian company that offers market their projects, also sells electronic products of high quality, both for Ham, both Broadcast and their accessories. VHF Antennas, mosfet power amplifiers, filters, insulators, power dividers, telescopic poles, antenna masts

PAR Electronics Inc. - Filters for the commercial 2 way market, MATV, FM broadcast, laboratory, marine industry, amateur radio, scanner and short wave. Antenna for amateur radio bands

NorComm Data Signaling - Sequential Decoders, DTMF, voice encryption, notch filters and band pass filters, single tone burst decoders.

Mobile RFI Noise identification - How identify and attenuate RF noise in mobile operations

Mobile Radio Noise Elimination - If you're driving around town listening to the buzz and engine whine blues, pick up this free pub and help yourself enjoy the music. Includes troubleshooting techniques and helpful hints.

IC7000BKT Icom IC-7000 CAT Control - CAT Control specific for Icom IC-7000 allows managing filters and all the commands of the RTX. Includes a function to synchronize and manage all the memories of the IC-7000.

KD5VC 250Hz Filter Mod - FT1000D 250Hz Filter Modification

FT-1000 Noise Blanker Mod - Technical resource and information on improving ft1000 receiver performance

ADIF Master  ^updated - ADIF Master is a Windows program for working with amateur radio log-books. ADIF Master convert Cabrillo, TR, CT logs or a part of it into an ADIF file. Also you can use ADIF Master to open and edit ADIF log files using filters, add and remove or modify ADIF tags and entries

SimJT - SimJT is a simulation program. It generates audio-frequency JT65 and CW signals in a background of gaussian white noise, with user-specified signal-to-noise ratio.

Noise Cancelling Headphones - Review of common noise cancelling headphones for under $50.00 by WA4PGM

Low Pass Audio Filter - 440 Hertz peaked low pass audio filter experiments

Resonant Frequency Calculator - This web based application will compute circuit values required for an L-C circuit to resonate at given frequency. Also it will compute the resonant frequency if given values for L and C.

Coaxial Stub Filters - A range of easy-to-build RFI filters by John Regnault, G4SWX

Low-Pass Active Filter Designer - Javascript filter design page with introduction to low pass filters by k7mem

High-Pass Filter Design - Online high pass filter design page with introduction to high-pass filters by K7MEM

Magnets dissipate RF noise - How magnets can help on reducing RFI

Noise tutorials - Noise foundamentals. Radio frequency interference noise.

Radio Noise - Radio Interferences, QRN, or noise, information by W8JI

Noise measurements and reduction - K1SIX- Noise Measurement and Reduction Techniques

The RF Noise Identification Website - VE3HLS Audio files to help identify rf noise (rfi). Identify the RFI that interferes with your reception

RF Noise Supression - CB Radio RF Noise Suppression

Calculating the Received RF Noise Power - Voacap, high-frequency ionospheric communications analysis and prediction

Computer monitor noise on HF - RFI Forum at eHam.net