In winter, it’s important to ventilate living and working spaces regularly. Here’s how to make a homemade measuring station ...

Home fires kill hundreds of people and do many millions worth of damage each year, but this simple $99 device can detect ...

This QRP SWR meter was designed for using with my Yaesu FT-817ND transceiver. Actually, it is antenna impedance meter based on Wheatstone bridge where antenna represents the unknown resistance. The ...

High Performance HF Power meter using Arduino and a Directional Coupler This device can measure power over a wide dynamic range from 10uW to 1 KW and will derive SWR for a 50 Ohm load The front end ...

Is BMI a buy now? Chart does not reflect overnight price.