Blinking lights with RF from nearby cell phone antenna

[fraxinus]

Hello,
I have one idea from some years. In front of my windows about 80m away there is a cell phone antenna. It look like the RF is enought to interfere a cheap FM radio / the good ones doesn't. So is it possible to make simple circuit with transistor amplifying and a little led lamp to blink with a rhythm of impulses radiating from an antenna of course with power suply from battery. No practical use just an interesting circuit.

Excuse me for my poor grammar in English.

 

[Externet]

My hotspot device for internet wears a led collar and turns it on when there is activity.

The 'collar' is a 5cm diameter wire loop in series with a Ge diode and a LED. Try if a nearby enough cell tower does anything. I do not think so. They cannot be beyond 5 Watts.

 

[cjdelphi]

A series of low voltage drop diodes stood up on their legs in series and an LED works fine for older 2G signals from your phone but 3g/4g don't work as it's a much shorter wavelength

But considering how close you are you might need a resistor on the led lol

 

[fraxinus]

I try this one
But it didn't work ,when there is a ringing phone nearby it shine but cannot detect RF from the antenna. If I put one more transistor and replace led with a piezo speaker I can hear impulses but i cannot make led blink.

 

[BobK]

Why would you expect the LED to blink? If that circuit works at all, it would simply light the LED whenever a sufficiently strong radio signal was detected.

Bob

 

[fraxinus]

this is what it does. And only when there is a phone nearby. The signal from outside is weeker and cannot light the led. I wonder if there will help conecting more of that cirquits with a capacitor and diode /left part only/ in series like a battery?