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Amateur Vertical Antenna Calculator  ^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

SD Pas de Calais France - SD Pas de Calais France

WA7BNM Contest Calendar  ^pop - Complete listing of upcoming ham radio contests, including rule summaries of this week's contests. You can also subscribe to his email service.

SM3CER Contest Calendar  ^updated Priority listing - Contest Service by SM3CER with Calendar, Rules, and Results

ARRL contest branch - ARRL contest calendar, scores, Forms and rules

CyberCWContest - Contest simulation: Call stations or call CQ. Program is excellent for CW contest practise or enter ongoing operating contests.

Buckmaster's World Wide HamCall Server  ^pop - Ham Call server by Buckmaster. Author of HamCall CDRom

UALR Call Sign Search - University of Arkansas at Little Rock's, U.S. Amateur Radio Callsign Lookup Page.

QRZ Call Sign Server  ^pop - Call Sign lookup by QRZ.com

The Finnish Callbook on the Web - Finnish Call Book by Heikki Hannikainen (OH7LZB)

Canadian Amateur Radio Callsign Database - Search engine is provided by Radio Amateurs of Canada.

Oscar Sierra Bravo Priority listing - The OSCAR SIERRA BRAVO is an International DX Group. We believe in promoting friendship through radio amongst all people in the world. The membership is open to ALL radio operators regardless of their nationality, age, race, religion, politacal beliefs, and their memberships with other clubs.

Desert RATS forum - Ham Radio Open Forum for all Hams. Sponsored by the Desert RATS (Radio Amateur Transmitting Society) .Palm Springs, Coachella Valley and the inland Desert Communities in Southern California.

UCSD - University if California San Diego Ftp site

Workman Electronics - Amateur radio accessories, power supplies, tvi filters, speakers, microphones, swr meters, preamplifiers, switches, cable and connectors,

Times Microwave Systems - Manufacture LMR Flexible low loss coax cable, connectors, and cable assemblies for Wireless Communications applications.

USNO Mater Clock Time - Time reference from USNO, USNO Time in Standard Time Zones,USNO Master Clock Time Animated GIF Clocks, Analog Java Clock, Compute Local Apparent Sidereal Time, Check your local System Clock vs. our Master Clock!

OH3TR ATV Pages - OH3RTR ATV Repeater, and some local ATV inventions like a two-stage 23 cm preamp.

Powerwerx - Cables, wires and related accessories, batteries and chargers

Radio Components - The widest range of stocked components for the electronics, electrical and mechanical engineer.

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.

Yagi Sterss - A full featured, graphical, user friendly program that performs structural analysis on horizontally polarized yagi antennas constructed from round tubing. YS can work in Imperial or Metric Units, and is likely to tell you more about a yagi antenna than you ever thought you needed to know. YS has been used by commercial manufacturers and premier station builders for over a decade by Kurt Andress, NI6W

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  ^{updated  pop} - This is a radio frequency propagation calculator for the transmission path between an RF transmitter and a receiver.