Amateur radio TV beacon inside CCTV case

András Veres-Szentkirályi write about an interesting project The Budapest hackerspace ( did some joint work with a local ham radio club and created an SSTV beacon housed inside a CCTV case that takes an image of its environment and transmits it using slow-scan television over ham bands. There’s currently one experimental device installed, and since […]

Rant: ham radio and hacking

Bill Meara just did a great guest post at Hackday on why today’s electronics hackers should give ham radio some serious consideration. With the removal of the Morse code requirement from all licensing exams, and the use of multiple choice testing (with the questions/answers available online) there’s no excuse not to consider pursuing your Amateur […]

FreeDV open source digital radio protocol

Interested in new open source digital radio protocols? Check out FreeDV. FreeDV is a GUI application for Windows and Linux (MacOS and BSD are in testing) that allows any SSB radio to be used for low bit rate digital voice. Speech is compressed down to 1400 bit/s then modulated onto a 1100 Hz wide QPSK […]

Raspberry Pi – DSTAR amateur radio net

The Raspberry Pi /DStar amateur radio group on Facebook combines two hobbies together, The Raspberry Pi computer and D-STAR radio. The group wants you to know about their R-Pi/D-STAR amateur radio net which will be conducted most Monday Nights starting February 18th, 2013 on REF026A (Vancouver, BC Reflector). Repeaters, DVAPs and Dongles are welcome to […]

CODEC 2 Open source speech coding at 2400 bit/s and below

What’s CODEC 2? In this video from the 2011 Digital Communications Conference held last September in Baltimore, MD, David Rowe, Australian Amateur Radio operator VK5DGR, detailed his work on an open-source, low bit-rate CODEC for Digital Voice for Amateur Radio. It’s presently in the Alpha testing stage. More information on this codec as well as […]

Arduino automatic CQ caller for amateur radio

VK3YE likes to work CW (Morse Code) on the 40-meter band, but doesn’t like the monotony of hand keying CQ endlessly. He devised this simple project using an Arduino to tap out CQ and his call sign automatically at predetermined intervals. The keying was originally accomplished using a reed relay as shown in the video. […]

30-Meter Amateur Radio beacon using Parallax Propeller

Eldon Brown, WA0UWH, has been experimenting with a Parallax Propeller he received for Christmas. Being an avid amateur radio operator, Eldon decided to code up a low power radio beacon on the 30-Meter amateur radio band (10.10 to 10.15 MHz.) He wrote this simple program to generate very slow speed CW (Morse code) radio transmissions […]

Arduino Morse Code generator

Denver writes that he has created a Morse Code generator, and posted a tutorial in my blog about how it is done. His tutorial begins with an explanation of how Morse Code is organized and proceeds to explain the process of writing an Arduino sketch to produce the sequences of “dits” and “dahs” corresponding to […]

Arduino TNC

Amateur radio operators use various digital data modes for radio communications. One such mode is known as packet radio, which transmits data in groups or “packets” of bytes. As described by the ARRL, “packet radio allows improved throughput and error control. The basic protocol for packet radio is AX.25. Transmission speeds typically range from 300 […]

ARISSat-1/KEDR test transmissions planned from ISS July 30-31

We know, we’ve been down this road before with the ARISSat-1, but this time they say it’ll work. Test transmissions from ARISSat-1/KEDR are scheduled to begin four days prior to deployment at 19:15 UTC on July 30 and then continue until 1430 UTC on July 31. The satellite will be connected to an external antenna […]

Amateur radio study guide has much information about electronics

Ham radio is nothing new, however if your new to electronics, or interested  in becoming a ham, we suggest reading one of Dan’s self-study guides. The RMS value of an AC signal is the voltage that causes the same power dissipation as a DC voltage of the same value. (G5B07) For an AC signal with […]

Dayton Hamvention May 20-22, 2011

The 60th annual Dayton Hamvention, a three-day amateur radio, computer and technology gathering is set this year for May 20-22, 2011, at the Dayton Hara Arena, 1001 Shiloh Springs Road, Dayton, OH 45415. Dozens of commercial radio and electronics vendors as well as numerous individual flea market vendors will be in attendance. While this is […]

qrpTracker: Arduino satellite tracker

VE9QRP has developed qrpTracker, a satellite tracking program that works on the Arduino platform. Based on the Plan-13 algorithm of James Miller, it can provide real-time satellite location and azimuth / elevation data and doppler shift tuning for up to fifteen satellites using a single ATMega328. With a small additional EEPROM, dozens of satellites can […]

UPDATE: ARISSat-1 deployment delayed until July

UPDATE: According to information posted on the website on February 13, 2011, the deployment of the ARISSAT-1 has been delayed until July, 2011. Project developers had originally announced that ARISSat-1 (f/k/a Suitsat-2), would be launched and transmitting by February 16, 2011! However, due to unforeseen problems, the actual deployment into space has been delayed […]

Packet radio and the Arduino Radio Shield

Packet radio is a means of sending data wirelessly over radio channels, and is often used by Amateur Radio Operators. (One form is APRS, described in our earlier post.) In the video following the break you get some idea of how packet radio communications are conducted. The video uses a piece of hardware known as […]

APRS homebrew digital radio interface

Automatic Packet Reporting System (APRS) is a digital data communications system often used by amateur radio operators in the 2-Meter FM band. You may hear such data transmissions on 144.390 MHz FM and other frequencies. DK7IN has published an interesting project which promises to let you transmit APRS data when connected to a licensed amateur […]

New satellites can be monitored on your scanner

The American Radio Relay League (ARRL) has posted a list of frequencies used by new experimental satellites. The birds were launched from Alaska in November, and transmit digital data beacons and relayed communications using the AX.25 protocol. The frequencies are in the 144 MHz and 440 MHz range amateur radio bands and can be received […]