[Ashish] let us know about his experiments in recreating the earliest type of radio set: a spark-gap transmitter and iron-filings coherer. He goes through the historical development of the kit in great detail, so we’re just going to skip that part. Go read it yourself!
Instead, we’re going to tease you with the coolest part of the rig: the coherer. In [Ashish]’s build, it’s a piece of tubing with some iron filings between two bolts. When a sufficiently strong EM wave hits the filings, they stick together and bridge the gap between the bolts, allowing electricity to flow and light up an LED, for instance. You can see this in [Ashish]’s video below the break, along with kmore discussion of that coherer…READ MORE
World Radiocommunication Conference 2019 (WRC-19) opens on Monday, October 28, in Sharm el-Sheikh, Egypt. WRC-19 is sponsored by the International Telecommunication Union (ITU). Some 3,000 delegates from most countries around the world will... Read more
See More
![Antennas and Wind [ ARRL The Doctor is In PodCast ]](https://qrznow.com/wp-content/uploads/2018/08/towerbent-90x60.jpg)
![Yaesu FTDX101D [ Preliminary Information ]](https://qrznow.com/wp-content/uploads/2018/08/FTDX101MP-90x60.jpg)
