Tuesday, September 3, 2019

A human powered CW transmitter

Many will know of Alf Traegar's pedal radio that was so central to the success of the Royal Flying Doctor Service. Developing that was a major feat given the power-hungry valves available at the time. 

Solid state parts has made human-powered radio equipment easier. I built a simple QRP crystal controlled CW transceiver in the case previously used by a hand-cranked torch. It was based on the well-known Oxo found in G-QRP publications. I kept the generator but removed the light. It has been heard over 700 km away. Here are some hand-cranked power videos. 

Have you built a human powered transmitter? How far did it go? Please leave your comments below.

PS: Enjoy these well-reviewed books on various amateur radio topics. They're available for under $US 5 each in electronic form. Or you can get them in paperback. Visit VK3YE Radio Books to find out more. 

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