free spectrum analyzer

Tuning EH antennas - How correctly tune an EH antenna using an antenna analyzer

Portable satellite antenna - A project for a portable antenna for amateur radio satellite reception, for 2 meters and 70 centimeters bands

Yagi-Uda Antenna Priority listing - The Yagi-Uda antenna, information on basic design, project and measure of Yagi-Uda antenna, include free repository/sample of beam antenna.

NS9RC North Shore Radio Club - The NSRC is a not for profit organization that extends through the entire spectrum of Amateur Radio.

The Anthracite Repeater Association - The ARA provides communications services to the area through its network of repeaters at the club site near Freeland PA

Anritsu - Provides technology and solutions for the electronic test and measurement, optical, rf and microwave, wireless, wired, telecommunications. Make Frequency Counters, Antenna and spectrum analyzers, power meters, signal generators

Keithley Instruments Inc. - Digital multimeters, power supplies, frequency counters, RF analyzers, signal generators

Yokogawa - Maker of optical spectrum analyzers, digital oscilloscope, digital power meters and more test equipmente related products

Applied Instruments - Applied instruments manufactures test and measurement equipment for the broadband telecommunications industry. products include carrier generators, signal level meters, rf switches, spectrum analyzers and a return alignment system.

PROMAX Electronica - Spanish makers or signal generators, spectrum analyzers, testers

Allocation of Radio Spectrum - This is the table of contents to a list showing how the radio frequency spectrum is allocated to different users in the United States.

Amsat FR - Ballon - Site dedicated to amateur radio ballooning

F5SWN morse code key collection - Mose code key collection by F5SWN

Leader Instruments - Test Equipment Depot - New and pre-owned agilent, avcom, fluke, hewlett packard, instek, iwatsu, leader, lecroy, tektronix,and more. Analog oscilloscopes, spectrum analyzers, network analyzers, power supplies, video test equipment, generators, meters and more

Alliance Test Equipment - Alliance Test buys and sells used network analyzers, spectrum analyzers, function generators, mulitmeters, probes, optical power meters, calibrators, attenuators, testers, and more from Tektronix, Fluke, Rhode & Schwarz, Advantest, LeCroy, Fujikura, California Instruments, NetTest, Keithley, Actrena / TCC, Instek

USAPhotoMaps - Free Windows APRS Client with capability of downloading free aerial photo and topo map data.

Panel and Dial - Freeware windows and linux tools to design front panels and dials labels for your home-brew projects.

MultiDem - USB LSB AM Modem (Modulator/Demodulator) for SdR and DSB (direct conversion) transceivers by F6CTE

AADE Filter Design - Freeware windows programs to design Butterworth, Chebyshev, Elliptic (Caur), Bessel, Legendre and Linear Phase low-pass, high-pass, band-Pass, and band-reject filters. Coupled Resonator band-pass filters

WinHell - Feld hell freeware windows program that permits RTX hellschriber operations by PA3BQS

RufzXP - RufzXP is an excellent free training software for improving code speed and CW practice, particularly (ultra) high speed memory copying of true amateur radio calls.

SigJenny - SigJenny turns your PC into a flexible and powerful audio signal generator for free. It can create multiple waveforms, sweep, fire single or repeating tone bursts. You can save your sound as a wav file, display a frequency response, use SigJenny a bit like an oscilloscope, and do a very good impression of a police car!

Voice Keyer - The Voice Keyer is a free Windows based voice keyer. It is very easy to use and it handles up to seven messages. By connecting your computer soundcard to your radio it's possible to just press a button and the computer will CQ for you, to spare your voice. It can also PTT your radio via the LPT port by SM3WMV

Soldering Guide - A guide to making good soldered joints and desoldering tips by the electronics club

2.4GHz Spectrum Analyser - This is a simple project that allows you to monitor the 2.4GHZ band in your immediate vicinity.