Surfin’: Learning Circuits and Electronics Online
This week, Surfin’ goes back to electronics school, but it’s free and online this time.
This came from Bob Perlman, KG6AF, the other day: Massachusetts Institute of Technology (MIT) -- which has had an open courseware initiative for several years -- is now taking the next step and making courses available online. Called MITx, this initial effort should be of interest to a lot of hams: An online course in introductory circuits and electronics that’s free to anyone who is interested. And best of, it’s free!
Circuits and Electronics (Course 6.002x) is the course title; it is adapted from Course 6.002, which serves as a first course in an undergraduate electrical engineering (EE) and electrical engineering and computer science (EECS) curriculum (or to you Beavers out there, Course 6.1 and 6.3, respectively).
The course covers topics such as “resistive elements and networks; independent and dependent sources; switches and MOS transistors; digital abstraction; amplifiers; energy storage elements; dynamics of first- and second-order networks; design in the time and frequency domains, and analog and digital circuits and applications. Design and lab exercises are also significant components of the course.”
World Record Balloon Attempt
A group of Amateur Radio operators hopes to establish a world distance record for an unmanned, helium-filled balloon. The BLT-28 balloon will launch from Katy, Texas, on a journey that will take it across the Atlantic and the Mediterranean, and then on to Nanjing, China. The South Texas Balloon Launch Team plans to release the balloon at 3 PM CST (2100 UTC) Saturday, February 11.
During the trans-Atlantic crossing, when out of range of shore based stations, the balloon’s APRS beacon will operate on the International Space Station (ISS) packet digipeater frequency of 145.825 MHz.
The balloon payload package weighs only about 5 ounces and contains a high altitude GPS tracking system and a 144 MHz FM APRS Amateur Radio transmitter. To conserve weight and battery life, no camera equipment will be on board. The maximum altitude is expected to be above 19 miles, with horizontal speeds between 100 and 150 miles per hour.
You can track the progress of the flight online by entering the payload call sign KT5TK-11. Those in the southern and southeastern United States have a good chance of copying the APRS beacons directly as the balloon passes nearby.
The APRS telemetry transmitter is frequency agile to cope with different APRS standards across the globe. The frequencies used will be:
USA: 144.390 MHz
mid-Atlantic: 145.825 MHz (International Space Station packet digipeater frequency)
Europe and beyond: 144.800 MHz


On April 9 at 4:15 PM (CDT), ARRL West Texas District 5 Emergency Coordinator Bob Ward, WA5ROE, received a call from Jeff Davis County (Texas) Fire Marshal Stewart Billingsley, N5HXZ. Billingsley informed Ward that a fire had begun in the West Texas town of Marfa and was rapidly approaching Fort Davis, 22 miles to the northeast.