operating modes

VP8DMH - Antarctica - Operating from Rothera Research Station Adelaide Island, Antarctica

Dalry Amateur Radio Group - Small group of amateurs with varied interests ranging from packet radio and data modes to electronics and tutoring.

The Central Scotland FM Group - The Central Scotland FM Group has provided and is responsible for maintaining many of the repeaters now operating in West, South-West, Central and East Scotland.

K9DIY Bloomington Amateur Radio Club - Club of Amateur Radio Operators living, working, and operating in and around Bloomington, Indiana, USA

Willamette Valley DX Club - Formed in 1955 is an incorporated Amateur Radio club dedicated to the promotion of DX information and operating by members residing in the Willamette Valley and Southwest Washington.

Digital on Six - Amateur radio digital modes on 50 MHz club page

EA4FRB Melchor Varela - Interested in electronics, active in HF and 6M, mostly in digital modes and also enjoy listening and receiving from utility stations. Many interesting homebrew projects

Digimode Sounds - Audio recordings of popular and not yet so popular digimodes

Digital Modes Samples - Audio recording of many ham radio digital modes emissions. Sound samples of HF VHF digital signals samples and published by KB9UKD

RSQ Signal Rporting for Digital Modes - This site is devoted to promoting RSQ as an improved signal reporting system for narrow band digital modes and to demonstrating its application to the popular PSK31 mode.

Digital Modes Information Page - An overview of digital HF radio operating modes includes a sample audio recording of each digital mode by WB8NUT

G6GVI's data transmission page - WinDRM for rapid data transmission over radio channels. A quick-start guide by Ross G6GVI and Jack G8HIK

Other Digital Modes - Whats new on ham radio with digital modes? DRMDV

digitalvoice Group - Digital voice on Amateur Radio - devoted to the discussion of digitized voice and data over analog emission modes.

PSK31 Fundamentals and Setup - Background: The PSK31 philosophy, The QPSK mode, Varicode, Sound Card DSP Setup and Operating Tips

IN3ECI - QRP Operations - Italian station operating mostly in QRP Mode, contain some interesting QRP projects for portable antennas and antenna mounts.

SSTV Mode specifications - How SSTV Works, article by F1ULT

An introduction to HF Propagation - This article will help to unravel some of the mysteries as well as giving useful operating tips to maximize your chances of working that rare station by G4UCJ

EchoLink E-Z Guide - Nifty E-Z Guide to EchoLink Operation A comprehensive guide for installing and operating EchoLink.

Opto Interface for Digital Modes - N2UZ interface first designed to be used with Kenwood TS-570SG, but also used with Yaesu FT-1000M

Getting Started with FT-817 in Digital Modes - Getting Started with Digital Sound Card Modes with the Yaesu FT-817 Transceiver by Clint Hurd KK7UQ

APRS Messenger program - APRS over digimodes including PSK, QPSK and GMSK with digipeating and two way HF internet gateway to the APRS-IS

HamSatDroid - This software predicts future passes for amateur radio satellites for a specified location and period of time. It runs on the Android operating system

phpPredict - Implementation of NORAD SGP4/SDP4 algorithms in PHP for determining a satellites location and velocity in Earth orbit. These SGP4/SDP4 models were ported from Predict 2.2.3 written by John A. Magliacane (KD2BD) for the Linux operating system.

Sound Card to Radio Interfacing - Sound card Hamming, PSK31 and other digital modes, CQ amateur radio article by K5ABT