altai signal generators

Worldwide Power Products - New and Used Industrial Generators, specialize in power generation equipment including over 100 new and used engines and generator sets for the industrial, marine, and petroleum industries

Low-frequency radio time signals - Several national physics laboratories operate radio transmitters that broadcast a time code signal.

Longwave Information - DK8KW Longwave Information Slow-Voice, Transmitting compressed analog Audio Signals on LF

The Longwave Club of America - Lowfers are folks who experiment with radio communications at unusually low frequencies.

A PC as VLF receiver - Using a PC with soundcard as a VLF receiver, how to use your PC as a receiver for narrow-band signals in the VLF radio spectrum by DL4YHF

Best VHF Contest Transceivers - Report on tests done on VHF Radios to understand which are best suited for 144 MHz operation in large signal environments like VHF contests

Waavebox - MacOSX real-time precision signal / waveform generator. Uses native Mac sound Out capabilities.

Opendous - Upconverter  ^new - Upconverter MF/HF Converter for Receivers. Converts signals in the MF and HF Bands to signals in the VHF Band. Intended for use in receiver applications with projects like RTL-SDR/SDR#/FunCube Dongle, or to listen to AM radio using an FM receiver.

Multiple viewer for your oscilloscope - You can measure 4 signals at one time by this machine. A project for single view oscilloscopes

RF Probe for HF - A RF Probe circuit for the RADIO frequency experimenter to check the presence of a RF signal and also to measure its strength

A DIY Square Wave Signal Generator - This circuit is very simple and has a fantastic range of potential uses.

ZL2PD HF RF Signal Generator - This circuit came out of some work done for two antenna analysers

SA5BKE Simple signal generator - A simple DIY signal generator based on NorCal QRP club kit

Analog HF Antenna Analyser - A simple antenna analyser for the HF spectrum with a built-in signal generator with 3-digit LED frequency display.