MAKE: Blog: FM Crystal radio

FM Crystal radio

Fm1000441
Larry writes -

I have heard, even from a physicist, that it is impossible to build FM crystal radios. On the other hand some experimenters claim that they have built them. This argument intrigued me to try and build an FM crystal radio, which I have done successfully. To my surprise, the result is an astounding performer, pulling in four local stations in Tucson. When connected as a receiver to a good sound system the sound fidelity is as good or better than more expensive AM radios. In fact, it sounds "high-fidelity".

FM Crystal Radio, thanks Pekar! - Link.

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Comments

Oldest comments listed first.

Posted by: Jack-of-Most-Trades on September 18, 2007 at 7:58 AM

I guess the "Physicist" never heard of Slope Detection, where you tune an AM receiver off to one side of the centre frequency to capture the audio as the carrier frequency swings back and forth at the audio rate.

That's how we used to listen to 6M FM on 52.525 Mcs. with an old Gonset "Gooneybox"

Posted by: mikiex on September 19, 2007 at 2:30 PM

simple and stylish

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