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A proven and practical approach to dealing with RFI from grow lights and more.

Ebook by Akira Matsuzawa Tokyo Institute of Technology, Building blocks in RF system and basic performances, Device characteristics in RF application , Low noise amplifier design, Mixer design and Oscillator design

Article showing how I've made a mains filter to reduce EMC in the electricity supplying my shack. I've used a type 31 Fair-Rite ferrite core and the video shows how this performs on 160m through to 40m.

Solving Ignition Noise RFI article. Help on removing noise interfences caused by ignition

Audio files to help identify rf noise (rfi). Identify the RFI that interferes with your reception. RFI Noise identification.

A set of utilities for the SSTV enthusiasts. SSTV signal generator, to generate SSTV audio signals from a bitmap. SSTV Signal Viewer to demodulate SSTV signals, anf SSTV Image Denoiser to removes noise from the pictures. By VE3NEA.

Complete catalog of low noise preamplifiers and microwave Gunnplexers.

The grounded half loop describe in this article is basically a half wave length wire on 80 Meters. The 80M grounded half loop antenna, inspired by a 1984 QST article by SM0AQW, is a compact solution for limited spaces. Comprising a 127-foot wire fed against ground and supported by radials, it balances performance and practicality. Despite compromises in length and proximity to structures, the antenna delivers strong signal reports and effective multi-band tuning using an SGC 237 antenna coupler. Ideal for CW operation, it offers low SWR on 80-10M, though noise levels and safety considerations warrant attention. This versatile design excels in constrained environments.

Speakers and RFI noise reduction products

Reduces line noise on TS-850

Low signal, noise-high AC gain preamplifier

Tests on a preamplifier for 50 MHz installed right at the feedpoint of the antenna.

FT-817 Radio Modifications, Improving the FT-817 Noise Blanker, increasing output power, using rechargeable cells, epanding frequency range

low-noise amplifier for HF reception, amplifies signals 80 to 100 times between 0.15 MHz and 30 MHz. It will let you hear more signals with your RTL-SDR plus Ham-It-Up setup

An improved version of DK9NL QRM Killer, with dedicated noise sampling antenna for completely filtering of plasma TV rattle on HF bands

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.

Noise eliminating products. Remove unwanted background noise and interference leaving only the speech. Clear communications, listen stress free. Dsp noise cancellation solutions.

CB Radio RF Noise Suppression

Fixing the IC-7000 noisy audio that can occur when IC-7000 audio output is connected to Hi-Fi earphones or external speaker.

Computers, TV's, and Switching Systems can cause noises to your receiver

Here you will find information on how antennas behave when stacked G/T is an important figure-of-merit for the antenna's overall receive performance, because it balances forward gain (G) against received thermal noise (T).

Technical resource and information on improving ft1000 receiver performance

Design & manufacture of Noise Eliminating speakers and modules for effective removal of unwanted noise & interference from SSB, HF, VHF, FM & UHF using new DSP technology

An easy to build with a cheap HEMT FET Transistor Low noise preamplifier with FHX35LG based on JH0WJF design

Noise Meter software for the noise meter tool by G8KBB that measure noise using a PC sound card and calculate noise figures by means of a calibrated noise source.

This sweeper built for a narrow bandwidth filter adjustment, use a simple 555 version sawtooth wave generator.

Cutting out the noise using a simple coax filter to improve the poor front end filtering

6BTV (or 5BTV or 4BTV) mod for 12 and 17 meter bands, how to make a 7BTV or 8BTV or 9BTV, easy and cheap

Noise reduction products

DK8KW laboratory tests to get some indication about the ability to communicate with signals below noise level using Slow-CW.

Memory recorders, Power meters, testers and multimeters, noise testers, signal generators

Yaesu FT-817 noise blanker improvement

A modification to improve quality of built-in FT-817 Noise Blanker

Radio Interferences, QRN, or noise, information by W8JI

A project of a linear regulated for low noise power supply 16v, 10A

It is not always possible to tackle the sources of local QRM. What remains is trying to reduce the noise level by means of your antenna system. Learn how to reduce QRM and understand how cancell noises.

Friis-It NF is the first iPhone OS based application that allows you to calculate noise figure, system sensitivity, and cascaded gain for an RF Receiver system

Build this noise reducing system to enhance audio of your speaker. A project by kg4jjh

How to reduce and eliminate the RF interference at VHF caused by the wired network

An interesting article on grounding and receiver noise

This page describes how to make the inexpensive Ten-Tec model 297 noise blanker work with the Drake R-4C receiver.

Have you searched and searched for a good speaker for your ham radio? That perfect speaker that would let you hear voices through the noise and static without hiss?

Zeus Radio program is designed specifically for the ZS-1 transceiver and supports all the basic functions (RIT, XIT, SPLIT, Noise Reduction, Auto Notch Filter, etc.) in order to work in the broadcast brought only pleasure. Zeus Radio works also with Hermes, Anan, Afedri, Red Pitaya, HiQSDR, Odyssey, Extio, RTL-SDR, Peaberry, Winradio, SDR-IQ, Afedri

This series will follow to completion the full Low Noise Microwave Amplifier design, development and prototyping.

How to create a low pass filter able to reduce or even remove the noise generated from your car or truck alternator

How to homemade antenna to be used with a handheld on the aircraft band to locate noise sources

Article on Phase-cancellation of noise on 2m band

Noise Canceller kit originally developed about 1989 by G4WMX and GW3DIX and improved by DK9NL and DG0KW.The VK5TM Noise Canceller is another version of the design, with the HF Vox circuit removed and a couple of other minor changes, including the use of SMD JFETs and a double-sided pcb.

An home made low noise preamplifier project for 144 MHz, with detailed circuit diagram. The VLNA-144 preamplifier has been Published on DUBUS 4 2019

Noise canceling DSP for ham radio good for Icom, Yaeu, Kenwood and any kind of radio