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Rybakov 806 Multiband Antenna - Multiband no trap no gap antenna. This Antenna is a small wonder, easy to build and allow you to work all HF spectrum with your TRX and it's internal ATU.

CSMA - CT Spectrum Management Association

TASMA - Twin-Band Area Spectrum Management Association

NESMC - New England Spectrum Management Council

Women in Ham Radio - A facebook group where all women and girls in ham radio can gather together to share the common interest of amateur radio.

Aaronia AG - Spectrum Analyzers - Handheld RF Spectrum Analyzer, EMC & Pre-Compliance Antennas, USB Analysers, Near Field Probes, EMF Shieldings

Tektronix - Spectrum Analyzers - Delivering confidence to confront the most challenging microwave and RF designs. Spectrum Analyzers by Tektronix

Agilent - Spectrum analyzers - Agilent maker of Oscilloscopes, Analyzers, Meters - Spectrum Analyzer (Signal Analyzer)

Indonesia Ham Radio Map - Amateur radio map of Indonesia

Analyzing UHF signals using FFT programs - With spectrum analysis of beacon signals, it's possible to see features relating to various propagation phenomonen.

A long wave receiving system - A long wave receiving system using FFT software Spectrum Lab

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

Receive VLF natural radio with Spectrum Lab - Using Spectrum Lab for the reception of VLF natural radio

Fatpigdog's Real Time FFT Audio Spectrum Analyzer - Fatpigdog's Real Time FFT Audio Spectrum Analyzer. User interface has the look and Feel of an HP Spectrum Analyzer. But, in addition to the regular Spectrum Plot, it also produces detailed Waterfall plots. The user can optimize the color map, chosing from a wide assortment of color themes. This analyzer supports multiple traces, trace arithmetic and normalization.

Audio Kit for iPhone - Audio Kit is a collection of four iphone applications which are essential for those working in audio and sound. A real time Spectrum Analyser, a Scope to display waveforms, an SPL Meter, and a sine wave Signal Generator.

Multimode - A new app for Ham Radio running on IPhone and IPod touch. Multimode is a modem for RTTY BPsk31 & QPsk31, with spectrum analyzer and Macros for easy operations.

MorseDec - MorseDec decodes and encodes Morse with a range of 5 to 50 wpm. It includes: auto-tracking for wpm speed, macros, spectrum analyzer. Easy to use but powerful.

Identifying sources of radio frequency interference - This page describes the results of some tests with a portable spectrum analyzer in attempt to identify the sources of RFI around the house. Radio interference was found in a number of unexpected places.

Ofcom PLT - Ofcom and Power Line Telecommunications (PLT)

100 MHz Spectrum Analyzer - Home made 0-100 MHz spectrum analyzer project

How to use HamAlyzer - How to use software Spectrum Analyzers like HamAlyzer by W3OZ

A Guide to Spectrum Analyzers - What you really need to know about spectrum analyzers

Spectrum Analyzer Tutorial and Basics - A summary or tutorial about the basics of the spectrum analyzer, what it is and what it is used for.

Digital HF Antenna Analyser Project - This antenna analyzer measures complex impedance over the 1.6 - 33 MHz HF spectrum by ZL2PD

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