speaker noise

8el 144MHz Super Low Noise OWA Yagi Priority listing - This is a super stable 50OHm direct feed Yagi for 2m using 1/2 inch tube and a real easy build.

14elem. 144MHz OWA EME Yagi - Simply a superb 50Ohm 2m Yagi with excellent bandwidth and most important, low noise.

14 el 70 MHz Low Noise LFA Yagi - This is a true monster Yagi for the 4m band which has a 50Ohm feedpoint with wide band performance yet the gain and F/B of a low impedance Yagi.

20 elements 432MHz LFA Yagi Priority listing - A0 element super low-noise simple to build Yagi for 70cms. Uses 1/4 inch and 12 inch tube/rod

26 elelements 432MHz LFA Yagi - 26 elements 70cms Yagi for EME ultra low noise excellent G/T figure. Easy self build

Sparkmuseum - Vintage radio and scientific apparatus by john jenkins, include antique radios, Horn Loudspeakers, Vacuum Tubes, A.C. Receivers

Bracknell Amateur Radio Club - The Club aims to meet the needs of all interested in amateur radio, and has a varied programme of guest speakers, surplus sales, members' interests evenings, and social evenings.

RF Noise Powerstroke Diesel - Reducing and removing RFI Noise

Audio CW Filter - A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ

Kenwood TS-480 Notes - N0RQ's brief notes on the Kenwood TS-480

Kenwood TS-850 Noise Blanker Mod - Reduces line noise on TS-850

FT-817 NB Improvement - Yaesu FT-817 noise blanker improvement

Spikes CB Radios - A full service sales & repair shop, sell a wide range of cb radios, scanners, antennas, mounts, echo, noise toys and a wide range of accessories. Atkinson, IL USA

DroidRTTY - DroidRTTY is an Android app to decode and encode Ham Radio RTTY with the build in microphone/speaker or wired to your radio.

IDSP - IDSP is an app for IPHONE and IPOD Touch. Made by 2 powerful filters, a band pass and a band stop with adjustable bandwidth. Filters are butterworth 4 and 8 poles, sample rate at 44,100 32 bit. Cancel every noise and hear only your qso.

Multi-Instrument - Contains a PC sound card based signal generator. It can generate functions, multitones, arbitrary waveforms, burst tones, MLS, DTMF, musical scales, white noise and pink noise, and frequency/amplitude sweep. Fully functional free trial downloadable.

Frequency Response Plotter - Draw static response time of an audio system. Originally intended for loudspeakers tests, is also a great tool for looking at microphone equalisation.

Friis-It NF for iPhone - 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

Bose Headphone Mod - Adding a boom mike to Bose Quiet Comfort (QC-1) noise-cancelling headphones

Homebrew external speaker - PE1OPM home made external speaker project

Anatomy of a Loudspeaker - There are a number of important technical issues relating to the matching of speakers to amplifiers, and to the wiring of multiple speaker systems

AVR Butterfly Keyer - The Atmel AVR Butterfly is a credit card sized board which contains an AVR MEGA169 processor, a six character LCD display, a five way joystick navigation switch, a piezo speaker, a 3 volt lithium battery cell for power and a few other odds and ends.

UHF Low Noise Antenna pre-amp - Low Noise Antenna pre-amp for SAT, EME & DX-ing

Improving Receiver Noise on 50 MHz - Tests on a preamplifier for 50 MHz installed right at the feedpoint of the antenna.

NEQRP Noise Bridge - A noise bridge is a device for measuring or comparing impedances on coaxial cables, antennas, components, etc.