digital frequenc

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

HF Digital DX News - Great source for digital dx news, with bullettins and newsletters.

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

rec.radio.amateur.digital.misc - Packet and other digital radio modes.

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.

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

Almost all digital electronics - This site is dedicated to electronics hobbyists, engineers, and Radio Amateurs interested in circuit design, homebrew and kit projects.

Getting Started with Sound Card Digital Modes - Setting your Amateur radio station up to operate the wide range of modern radio software which uses the PC sound card to generate and receive signals. Murray Greenman ZL1BPU

Radio & Communications  ^pop - Info about many aspects of Radio & Communications. Antennas, signals, frequencies, codes, swr, scanning etc.

Digital Communications Conference - Hams convene each year at a Digital Communications Conference to evaluate and further the state of the art. TAPR's webserver provides conference papers from previous DCCs as well as information about the upcoming DCC.

T.A.P.R. - TAPR, an international organization dedicated to amateur digital communications, is pleased to present this collection of information about TAPR, via the World Wide Web.

SSTV Nets - List of SSTV Net frequencies

Amateur Satellite FAQ - Beginner guide to amateur satellite, with tech info about accessories, antennas, and frequencies.

The FAX and SSTV Corner - SSTV Fundamentals, frequencies in use for SSTV and many SSTV related infos, includes Fax basics

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

Dansk Scanner Information - Danish frequencies and scanner resource

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.

MultiMode - Digital modes decoding software for the macintosh. Decodes CW, RTTY, WEFAX, SATFAX, ACARS, DTMF, SSTV

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.

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