Friday, May 17, 2019

Broadband RF noise detector

OK, so it's not an antenna or an accessory but it can still be handy around the shack. Wave it near a modem or switch mode power supply to see how much RF it chucks out. Hear aircraft at an airport or the local AM stations (all at once!). 

I'm talking about a broadband AM receiver. It's very simple. Basically a crystal set followed by a high gain audio amplifier. See the circuit and hear a demonstration in the video below. 

I also suggest following the links and reading the viewer comments.

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