speaker noise

160 meter low noise antennas experiments - VE7CA experiments on 160 meters band antennas, looking for better performances on reception.

Noise Reduction on 40m Priority listing - DF9CY implementation of W1HIS suggestion of inserting a common mode choke into a 40m antennas feed-line.

VLF-LF and the Loop Aerial - The article discusses the theory of loop aerials for receiving and how they reduce the level of local noise by Lloyd Butler VK5BR

Importance of noise reduction in wires antennas - An old post by John Doty about effects of noise in longwire antenna.

Antique Radio Store - Based in San Diego CA, collectible radios, test equipment, tubes, antique radio parts, speakers and kits

Ham Radio Talk - The amateur radio forum with more signal and less noise.

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.

Timewave - Sells leading-edge voice and digital communications products to the world-wide military, government, industrial, and amateur radio marketplaces. Bluetooth Remote Audio/PTT, Rig Controller with Audio & PTT , HamLinkUSB Rig Control, Noise filtersm antenna analyzers, Multimode Data Controller, TNC, Packet Radio Terminal Node Controller. USB2RS232

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

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

RF Circuit design basics - 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

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

The KA7OEI FT-817 pages - FT-817 Radio Modifications, Improving the FT-817 Noise Blanker, increasing output power, using rechargeable cells, epanding frequency range

RSCW - RSCW is a Linux/Unix program for decoding morse signals using the computer's sound card. It has been written/optimized for digging weak signals out of the noise.

DroidPSK  ^updated - DroidPSK is an application to decode and encode Ham Radio BPSK31 with the build in microphone/speaker or wired to your radio.

Spectrum Analyzer Real-time FFT - Eight-channel Audio Spectrum Analyzer is a set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. WDM drivers support. FFT Spectrum Analysis, OscilloScope, Frequency counter, AC/DC voltmeter, Signal-to-Noise Ratio, Signal-to-Noise and Distortion, Spurious-Free Dynamic Range, Effective Number Of Bits, Total Harmonic Distortion, Inter-Modulation Distortion, Phase Shift. Special modes of dual-channel FFT spectral analysis: Separate channels spectra, Spectra of digital sum, difference, product of two signals, Spectrum of digital product of original signal and its fundamental, Spectrum of Real and Complex Transfer Function, Cross Spectrum. Standart weighing of spectra according IEC and CCIR. Oscilloscope modes (for dual-channel ADC) are: original signals, sum, difference, dependence of one channel on another, amplitude distribution of input signals.

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

Noise Figure Meter with a Spectrum Analyser - A relatively simple automatic Noise Figure (NF) meter was developed which is using a spectrum analyser as the receiver and logarithmic power detector.