'kv4p HT' is an amateur radio transceiver that can be used in combination with an Android smartphone, and can send and receive voice and text messages. kv4p HT is developed with all open source ...

The article that appeared in this magazine and in EDN last year about ham radio in the 21st century generated a lot of interest and a lot of questions about various aspects of the hobby. This article ...

Last week, I covered the ridiculously low barriers to entry to amateur radio, both in terms of financial outlay and the process of studying for and passing the FCC examination. You’ve had seven days, ...

When we first spotted the article about a one-transistor amateur radio transceiver, we were sure it was a misprint. We’ve seen a lot of simple low-power receivers using a single transistor, and a fair ...

This rugged power supply is based on the popular LM338 3-pin voltage regulator. The LM338 is capable of supplying 5 A over an output voltage range of 1.2 V to 32 V with all standard protections like ...