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.”

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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

Hams Provide Communications Support During West Texas Wildfires

firesOn 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.

“Stewart asked me to call the National Weather Service to get it on the alert system, as well as the AM and FM radio stations in Alpine,” Ward told the ARRL. “He wanted it broadcast over the radio stations that he needed the Mano Prieto and Fort Davis Estates sub-divisions evacuated. People in the area know that when an emergency happens, they need to tune into these stations for the latest information. This was the Rock House Fire. At the same time, another fire, the Roper Fire, had started on the eastern edge of Alpine.”

Ward contacted the NWS and the radio stations and then put out a call on 2 meters, asking for Alpine amateurs to report to the Emergency Operations Center in Brewster County. “When I arrived, ARRL Brewster County Emergency Coordinator David Cockrum, N5DO, and Brewster County Emergency Management Coordinator Tom Santry were there. Tom asked us to activate a net on the Big Bend Amateur Radio Club repeater system.”

Ward said that a ham was dispatched to Jeff Davis County -- 26 miles to the northwest -- to assist ARRL Jeff Davis County Emergency Coordinator Jim Fowler, KD5KBU: “Jim, in addition to being the EC for Jeff Davis County, is also with their fire department, so he was dealing with a lot of things. We also sent hams to assist at the Alpine Police Department and the dispatch in Brewster County, as well as at the radio stations. Due to the fire, there was no electricity or phone service, so hams at the police department and dispatch handled traffic. The ham at the radio station received messages from the Emergency Operations Center in Brewster County concerning public safety, highway closures and evacuations to be broadcast over the air.”fire2

Ward explained that later that day, the repeater system was linked to the West Texas repeater system to handle traffic for the American Red Cross. “We also provided phone patches for American Electric Power, the local electric company, as they came in to install a large generator to supply power to the Fort Davis area,” he said. “We finally secured our net at noon on April 11.”

As of April 13, the 30,000 acre Roper Fire is completely contained, but the 108,000 acre Rock House Fire is only 60 percent contained. According to Terry Allison, K5TDA, a firefighter in Alpine, about 30 houses and two businesses in Fort Davis were destroyed by the fire, while two houses in Marfa were destroyed. County, State and Federal firefighters are in control of the operation and no further Amateur Radio involvement has been requested.

Blast Off!

Nathan McCray, K9CPO

ARRL Education & Technology Program Instructor

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The West Elementary School space program launches “Lunar Cats” and new technologies.

The year was 1989, cell phones cost nearly $4000, wireless technology and the World Wide Web were in their infancy, and Intel had just released its “fast” 486 processor. 1989 was also significant for a group of teachers and students at Zion District 6, West Elementary School (Illinois) as it launched its first simulated space program. This space program took a group of highly motivated students and simulated a mission to the moon that included the launch of a spacecraft, mission control, a space habitat and splashdown. The students would stay overnight in a space capsule and complete science experiments.

In the words of Superintendent of Zion District 6, John Ahlgrim, “This project actually has a long history at West School dating back to 1989, and while the mission has been absent now for a number of years, the program has come back with quite a launch!”

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