Several folks suggested that I try putting my Arduino to sleep in an effort to reduce RFI with my relay controlled antenna switch. So, here are some experiments with Arduino sleep modes. Read more
Tag: RFI
My Testing Projects – Making It Up 2021 Review
My testing projects were fun, and consumed much of my time during 2021. Our main focus was on RFI and antennas. Read more
Power System Interference Spectrum
Take time out to understand the source and complexity of power system interference spectrum. My video explains where a lot of RFI comes from around your house. Read more
Sound Card Oscilloscope for SDR
You can use a sound card oscilloscope for many things. My favorite use is to study noise and interference signatures on the shortwave radio spectrum. Read more
My Collection of RFI Fighting Videos
If a picture is worth a thousand words, you might find my RFI fighting videos useful. When you can actually see spatial filtering work, you get motivated. Read more
Radio Accessory Power Distribution Box
Another successful 3D printed gadget for the radio room. This time, I built an accessory power distribution box for a couple of dollars. Read more
Removing Switched Mode Power Supplies from Shack
Removing switched mode power supplies, and their attendant RFI, can be quite simple. Let’s take a look at my cheep and cheerful approach. Read more
All Good Things – QRM Eliminator Wrap-up
If you set up noise antennas properly, any of these devices can work for you. That’s the essence of my QRM Eliminator Wrap-up. Read more
Tackle Multiple RFI Sources with SIFT
Can you remove multiple RFI sources at the same time with spatial filtering? Perhaps, but it’s not easy. Read more
Digital Versus Analog SIFT
Which reduces wideband RFI better: digital versus analog SIFT. Take a look at my experiment and judge for yourself. Read more