2.4Ghz Crystal Radio

A nice distractment from that Philco branded pile of HATE downstairs.

[@tonksdude]

I remember when I was in fourth grade my teacher bought me a crystal radio kit from radio shack

[@WetDoggo]

What you're talking about is pretty interesting, but I can just barely follow your thoughts...
I'd recommend you to write them down and do a second version of the video 👌

[@roland985]

That could actually be useful if you had a yagi on it, could find BT/WLAN targets by hearing the beacon packets.

[@ddvde]

These signals are so weak, even with a yagi that has impossibly high gain you would have to be within a metre or so of the target.

[@drunkonacid]

@@ddvde this is when the cloak of invisibility and ant people come in handy. No one would know a thing

[@trevorhaddox6884]

Another thing to try would be the dongles for wireless keyboards and mice. Those are also 2.4GHz. Also BT keyboards for tablets, you should be able to hear the different keys.

[@perryzheng8372]

you have alerted the fcc death squad, hide

[@kreuner11]

It's legal to receive basically everything unless you're decoding secret comms

[@TheGmr140]

Cool 😊😊

[@MONO-ARCH256]

this video could been posted 16 years ago

[@xvdifug]

Too Cool!

[@ShayBlez]

Thanks for posting, pretty cool to listen to BT/Wifi. :]

[@Ur_local_traingeek]

can you do a build tutorial

[@robumf]

Many years ago.Moments before you get an incoming call, the speakers made noise then your phone rang.
Is this similar on a different frequency.

[@qwertykeyboard5901]

@@robumf That was part of the inspiration.

[@galacticboy2009]

That still happens. If I use cellular data instead of wifi, I can hear it on the cheaper / less shielded computer speakers at work.
And depending on how much amplification the actual speakers themselves are doing, it's louder.

[@ddvde]

What diode did you use in your build?

[@qwertykeyboard5901]

@@ddvde 1N60

[@WilliamBraswell-sk8kg]

Hi

[@enotikbteplovoze]

Im too stupid to do so, but how do i connect op amp to it? I would really like to make a wifi detector with this thing :D

[@qwertykeyboard5901]

@@enotikbteplovoze Instead of connecting to crystal headphones, connect it to the op amp.

[@cosmefulanito5933]

The video doesn't make sense for several reasons:
1) The 1N60 do not reach 2.4Ghz.
2) Your "receiver" is not tuned. So you will receive anything but 2.4Ghz.
3) The mounting you made on a piece of wood will add stray capacitances that will detune the antenna.

[@qwertykeyboard5901]

@@cosmefulanito5933 1.) It doesn't necessarily HAVE to reach 2.4Ghz, just conduct asymetrically enough so that the modulation can sound the earpiece. I'm sure a higher frequency diode would make a more sensitive radio though.
2.) Yes and no. The "tuning" on this radio is set by the length of the antenna. The filtering is EXTREMELY wide, but it does tune the radio to _about_ 2.4Ghz.
3.) This is correct!