Radio wave refraction depends on density of free electrons and frequency. Skip distance is tied to refractive index and height. Read more
Category: Shortwave Radio
Understand Radio Waves in Various Media
Let’s understand radio waves, and how they behave is different media including solid wire, free space and plasma. Read more
Basic HF Radio Propagation Refresher
Let’s do a level set on basic HF radio propagation through the ionosphere and around the world. Read more
High Frequency Aircraft Antenna
So, how does a modern airplane use shortwave radio successfully? You may wonder what kind of high frequency aircraft antenna are used. Read more
Shortwave Aircraft Radio Listening
If you want something else to listen to on your SDR, try shortwave aircraft radio listening for trans-oceanic flights. Read more
Test Your Cables Regularly with NanoVNA
You should test your cables regularly. Some may go bad, especially cheap or older ones, with poor connectors or breaks. Read more
Antenna Switch Adventures – Looking Forward
My antenna switch adventures have provided a valuable learning opportunity. Especially to reduce noise in RF circuits under Arduino control. Read more
Sainsmart Relay Antenna Switch Disappointment
Well, it’s time for me to declare my DIY antenna switch disappointment. I can’t get rid of the noise n matter what I do. Read more
Using Loop Array with a Single Channel Receiver
So how do you use a wideband loop array with a single channel receiver? With a receive antenna phasing controller, of course. Read more
Antenna Switch Port Isolation Considered
My homebrew antenna switch port isolation is decent, but not great. But too much RFI is being fed though the outputs. Read more