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Amateur Vertical Antenna Calculator  ^{updated  pop} - This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen.

Crossed-Wire HF Antenna - This Crossed-Wire Electrically-Steerable HF Antenna, capable of transmitting signals over the entire 1.8 to 30MHz HF range, and capable of receiving signals at much lower frequencies is basically a crossed centre-fed wire system, consisting of four thin wires brought to a central mast by G3YNH

Darley Amateur Radio Club Online Exam - ARRL Online practice exam require Java capable browser

US Amateur Radio Frequency Allocations - US Amateur Radio Band Plans by ARRL

rec.radio.amateur.equipment - All about HAM radio hardware.

Trivalantene - Professional antennas in MF, VHF, UHF and SHF frequency range for military applications, civil-professional market, mobile communications, radioamateurs and antennas for special applications - EMC, radiomonitoring, etc.

AOR UK Ltd - Manufacturer and distributor of AOR equipment for England and Ireland.

Hoka Electronics - The WWW home page for information about our specialist range of HF and VHF radio digital signals' analysis and decoding equipment.

Icom America - Manufacturer of amateur, avionic, land mobile, marine and communications scanner & receiver equipment.

Drake - Drake has been a manufacturer of electronic communications equipment for over 50 years. Our reputation for producing quality American made equipment has been well earned and is respected internationally. Today Drake produces equipment for various markets around the world.

The home of NuMorse and NuTest - Learn the Morse Code. Learn from random text or simulated QSO (contact) sources. Create character sequences that you find difficult. Compare your results with what the program sent and view error statistics. Take simulated tests. Sound card not essential. Evaluation version not time limited.

Near-Realtime MUF indicator  ^pop - This is a highly informative map that can be used by amateur and professional radio communicators to determine maximum usable frequencies for any world-wide path at the indicated UTC (Zulu) time.

Introduction to HF propagation - An Introduction to High Frequency Radio Propagation by IPS Radio & Space Service

Scanning Reference - Informations about Scannings, with frequencies, information about scanning, hardware and software reviews

Euro Radio System - "Amateur radio equipement; Procom equipement Duplexeur, amplifier , Coax , connecteur microwave equipement"

Carrier Communications - Carrier Communications sells new and used Motorola and GE two-way radios and microwave equipment We also rent space in 22 antenna sites located throughout California to commerical and amateur radio users.

Bandercom - Radio sales to over 60 countries, source for all communication equipment, individual hobbyists, professionals and dealers.

Spy Centre - All about Spy Numbers Stations, which send coded messages to agents. Includes schedules and frequencies of stations.

Frequency Manager for Windows - A Windows program for Storing, Sorting, Searching, & Printing Frequency Lists.

Swisslog - SWISSLOG is a Freeware powerfull Logprogram for the sophisticated Ham. Due to its flexibility it covers all requirements. Run under Windows and DOS and support external devices, dx cluster, reporting and many features.

RadioRaft  ^pop - RadioRaft decodes 10 different ARQ modes, 8 different FEC modes, Packet, Baudot, CW... It works with a Hamcomm interface or a radiomodem. RadioRaft offers automatic detection of modes, speeds and shift. It comes with a frequencymeter/baudmeter included, it has signal frequency tracking and a bit by bit display mode. Very easy to use. practical and fast.

Radio Propagation & Diffraction Calculator  ^pop - This is a radio frequency propagation calculator for the transmission path between an RF transmitter and a receiver.

Atomic Web Clock - National Institute of Standards and Technology (NIST). Synchronize your pc's clock to the NIST Atomic clock.

Fil's Repair page - Series of comprehensive repair guides for consumer electronics equipment and other household devices

40MHz Frequency Counter Module - Design for a very low cost 6-digit frequency counter module using of the shelf components