Back when comic book characters taught you something too. One of the simplest radios you can make.

@freemo I made one of these! It's cool, but man is it hard to pick up a signal (much less hear it). Still, having a no-power radio is pretty neat.


@klaatu I used to build them as kids. If you do it right its not too hard, but if you dont know much about radio it can be hard (I'm an RF engineer among other things so I have an advantage :))

Basically you need the right size antenna (or atleast a reallllllly long with with a good view of the sky). You also need to be very particular about how you position the pencil lead.

The place most people mess up is one of those two. But if you have an antenna that goes from the ground up about two stories (usually a wire hanging out of an attic window) then you stand a good chance of hearing something.

Its also important to get the winding count right. Really thin wire is needed on an air core (what is usually useD)

@freemo Great to know, thanks. The flat I live in right now is surrounded by trees and a hillside, and I don't really have the landlord's permission to string wire all over the property. I'm hoping to move soon to a better location, so I'll likely have more opportunity to customize my setup there.

@klaatu Temporary setups arent too tricky either. Just hang the wire out of your window when you use it then puill it back in when your done. Or string it up in a tree for a few hours.

Sign in to participate in the conversation
QOTO Mastodon

QOTO: Question Others to Teach Ourselves. A STEM-oriented instance.

No hate, No censorship. Be kind, be respectful

We federate with all servers: we don't block any servers.