When it comes to radio frequency oscillators, crystal controlled is the way to go when you want frequency precision. But not every slab of quartz in a tiny silver case is created equal, so crystals ...

[Hans] wanted to see the frequency response of a bandpass filter but didn’t have a lot of test equipment. Using an RTL-SDR dongle, some software and a quickly made noise generator, he still managed to ...

A radio receiver consisting of just a very good analog-to-digital converter connected directly to the antenna plus a powerful computer could make a great radio. However, the present state of the ...

RTL-SDR.COM is a blog about news and projects revolving around the “RTL-SDR” – a very cheap software defined radio based on DVB-T TV tuner dongles with the RTL2832U chip. The RTL-SDR can be used as a ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. In my last column I described measurements I made on some indoor TV antennas. The “Spectrum Spy” ...

We’ve all used walkie-talkies at one point or another, or seen a cop do it on some movie. Short-hand radio has been around forever, but creating your own radio to listen in can cost hundreds of ...