noise generator

Multiband wire antennas and ATUs  ^pop - DC1YB experience on multiband wire antennas. In particular examine FD4 windom and G5RV antenna, considering noise levels and matching aspects. Author reviews also the usage of Automatic antenna tuners in TS-50 TS-480 and GC-3000

T2FD, The Forgotten Antenna - The terminated. tilted, folded dipole T2FD is a little known antenna that performs excellently. Compact in size compared to a half­-wave dipole the T2FD provides signal gain, wide frequency coverage, and exceptionally low noise characteristics.

Common Mode Choke Theory - A common mode choke may be used to reduce a type of electrical noise known as common mode noise. Electro-magnetic interference (E.M.I.) in the circuit's environment is one source of electrical noise.

Common mode chokes - Excellent article on limiting noise using chockes by Chuck Counselman, W1HIS

The K6STI Receiving Loop  ^updated - This relatively unknown antenna does an amazing job pulling weak low band signals out of man-made noise backgrounds

Remotely-tuned loop antenna for LW and MW - This article describes how to build a loop antenna for low frequency (LF) and medium wave (MW) reception with remote-controlled tuning. The antenna is extremely sensitive and can be built mostly from parts from old radios and tape recorders. Like all loop antennas, it is highly directional, which allows you to null out unwanted noise sources.

G/T Simulations - by VE7BQH - 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).

SSB Electronic USA - manufactures and distributes HF, VHF, UHF and SHF equipment covering 10MHz. - 47.0GHz. Our products include: Wireless LAN / WAN Bidirectional Linear Amplifiers, Low Noise Preamplifiers - LNA's, RF Linear Amplifiers, Relays, Transverter Systems, Frequency Translation Systems, Downconverters, Antennas, Parabolic Dishes, Coaxial Cable, Relays, Antenna Switches, Microwave Test equipment, PC controlled Receivers, Microwave Linear Amplifiers including models for Telemetry, Wireless, and CDMA applications.

LNA Technology - LNA Technology High Performance Low Noise Preamplifiers for Amateur Radio, VHF-UHF weak signal, DX, EME, and commercial applications.

Misty Hollow Enterprises - High Accuracy Marker Generators, DDS VFO for Drake and Collins radios

Mayberrys power equipment - Outdoor power equipment, reseller of Honda Generators

The Noise Floor - The noise floor: 1750 meter lowfer and medfer resource

FT-1000D Noise Blanker modification - This modification was developed by W8JI for his FT-1000D.

Less White Noise - FT-897D Modification - Modification for FT-879D to remove the white noise spreaded far above 3 kHz by Petr OK1FIG

Radio Astronomy Supplies - Radio Astronomy Supplies astronomy products since 1994 including radio telescopes, LNA's, noise callibration source, books, videos.

Faros - Windows shareware, automatic NCDXF beacon monitor for Radio Amateurs, SWL'ers and HF communication engineers. by Alex VE3NEA. It continuously monitors 18 NCDXF beacons on five bands, automatically detects the presence of the beacon signals, even in QRM and noise.

Cleverscope - The PC USB mixed signal oscilloscope - Cleverscope PC based oscilloscopes, spectrum analyzers and signal generators

Geosat - MSDOS program to calculate Az-El position of geostationary satellites at specific location and carrier to noise ratio of received SAT TV signal.

Bitscope Waveform Generator - Integrated DSP based waveform generator and timing for BitScope. Arbitrary waveforms, synchronized clocks and external triggers.

SweepGen - SweepGen turns a PC into an Audio Oscillator and Sweep Generator which can be used for testing audio or educational purposes. In conjunction with audio test instruments, you can make frequency response plots. SweepGen uses the sound card in your PC to produce sinewaves

A simple VOX circuit - Here is a 3 transistors 6 diodes circuit that is a Voice Operated Tx PTT control as well as an ANTI VOX circuit to stop mis-operation from Rx noise by G8MNY

Soundcard Audio Tools and Toys - Soundcard audio tools and toys, experimental ideas and utilities. Signal Generator, Frequency-counter / instrument-tuner, Real-time Spectrum Analyser

Using ferrite for interference suppression - 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

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

An Inexpensive PL Tone Encoder - If your local repeater has got you singing the PL tone blues, then read on. For less than $10, an inexpensive PL tone generator can be constructed that will bring new life into that old non-PL rig.