CQ WW WPX SSB Contest 2020

The WPX Contest is based on an award offered by CQ Magazine for working all prefixes. Held on the last weekend of March (SSB), the contest draws thousands of entries from around the world.


Operating Modes/Digital Modes
In the field of RTTY transmissions with audio boards, you can transmit either in FSK or AFSK mode. Which is better: FSK or AFSK? Advantages and Disadvantages of both methods

VHF Baluns: Fact and Fancy

Our ideas about HF baluns have changed dramatically in recent years. The focus today is very much on suppressing unwanted common-mode RF currents, to reduce both the received noise levels and the risks of causing interference on transmit.

137MHz Quadrifilar Antenna

Antennas/Quadrifilar Helix
This version of the 137MHz quadrifilar antenna for APT reception is an adaptation from Bill Sykes and Bob Cobey Taming the QFH which appeared in the March 1997 RIG magazine. This article contains detailed 3D pictures and models and detailed pictures.


IC-R20 by Icom. Wideband Receiver Professional radioreceiver, allow double receiver, from HF to Microwave, digital recorde, DTCS, Memories and 11 hours countinuous reception.

Fldigi 4.1.11 released

New bugfix release version for Fldigi. The developer's team of the popular multiplatform multimode amateur radio software has recently announced version 4.1.11 of their open source program.

Helical Antennas -Theory

Helical antenna or helix antenna is the antenna in which the conducting wire is wound in helical shape and connected to the ground plate with a feeder line. It is the simplest antenna, which provides circularly polarized waves.

Taming the Quadrifilar Helical Antenna

Antennas/Quadrifilar Helix
The Quadrifilar Helical antenna provides circular polarization and complete hemispherical reception, which is precisely what is needed to receive the polar orbiting weather satellites, and as a 2 meter antenna it will receive horizontal, vertical and clockwise circular polarization.

Online Morse Code Training

Software/Morse Code Training
Learn Morse Online in 40 lessons with this web based morse code learning program, based on the Koch method. Choose the lesson, adjust the wanted parameters, and start the transmission of a set of random characters based on chosen lesson. Recognize the code and verify it at the end of the lesson.

SP DX Contest 2020

SP International DX Contest, April 4, 2020 15:00 UTC to April 5, 2020 14:59 UTC

The Truth about the G5RV Antenna

The G5RV Antenna and two other improved alternatives to this basic design, the well known ZS6BKW antenna and the W0BTU variant

Yaesu FTM-300D

Yaesu FTM-300D new 144/430 MHz Dual Band C4FM Digital/Analog FM Mobile Transceiver GPS C4FM Dual RX WIRESX Node

Grid Square Locator System

The Grid Square Locator, also known as the Maidenhead Locator System, is a geographical co-ordinate method based on a 6-digit code, widely used by amateur radio operators to determine a rough position on the Earth.