A more sensitive RF diode?

Why not use a lithium battery?

More IoT press-release fantasy. You could post 50 of those every day.

Interesting diode though, for other applications. Now we need it to become available for 10c/pop at Digikey.

IoT is hyped to the hilt with all sorts of fantasies. Then there are those who ... just do it and no press releases. I have one such project on the lab bench for debug right now. Soon it'll be out there in the field without much fanfare.

Will you do us a little fan faring after it's out? Curious! Mikek

I thought harvesting radio power was generally illegal.

NT

On a sunny day (Fri, 27 Sep 2019 10:10:48 -0700 (PDT)) it happened snipped-for-privacy@gmail.com wrote in :

Every radio does that to some extend. Or is there a maximum power level above which it becomes illegal [where you are]?

I'll ask the client and if ok I'll do that. It's in the oil business and another (different client) in the ag business.

Not if it's your own WiFi signal. Some of the old broadcast-power fantasies are creeping into reality, and RFID tags were only the first bit of the crawl.

It i much older than that. There were some self powered crystal receivers, in which there was a fixed additional resonant circuit tuned to a strong local broadcast station. The voltage was rectified and used to power some amplifier stages in the actual freely tunable weak signal section.

it's not always going to be your own if such things get widely deployed

NT

It seems it can be.

Brian

In message , snipped-for-privacy@downunder.com writes

I can light an LED from a Longwave Transmitter located 20 miles away. It puts out 50kW. I dare say I could get it to run a small transistor amplifier.

Brian

Go for it. Channel Tesla. ;-)

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It really is illegal. Closer to long wave transmitters, you are supposed to have to wrap your fluorescent tubes in a chicken wire Faraday cage to avoid getting illegal free lighting.

Less than 20 miles from here there was Europawelle Saar,

When electronic ignition became normal, they had to shield a nearby Autobahn, or the cars would simply stop.

Last year, they took down the antennas:

First half of the movie is non-content.

There is an old HP app note: Every Schottky is a zero-bias detector. It is just a matter of matching.

/gerhard

Much less would be sufficient to power a source follower between the high impedance resonant circuit and relatively low impedance detector and headphones (or horn speaker). Reducing resonant circuit loading allows a higher loaded-Q and hence optimizing the bandwidth to transmitted bandwidth (5-20 kHz).

Better known as Radio Luxembourg.

That high power caused intermodulation in the ionosphere, known as Luxemburg effect

In which countries does such laws exist ?. I could understand if tapping electric or magnetic field from mains wires could be lapelled as electric stealing. However, claiming tapping of electromagnetic fields would be illegal, is simply ridiculous .

On a sunny day (Mon, 30 Sep 2019 02:34:39 +0200) it happened Gerhard Hoffmann wrote in :

I had a LED connected to my 27 MHz GPA antenna, it came on when my across the street neighbor turned on his transmitter. I called him via radio and asked how much power he was running

I tested my 250 W shortwave linear antenna walking in the garden with a neon bulb.

Turn the thing around: Is it legal for others to irradiate your house with 5G?

Alu-foil, alu-foil hats, I see a market :-)

stating the law's position is not ridiculous afaik. His faraday cage comment is though.

Am 30.09.19 um 07:44 schrieb snipped-for-privacy@downunder.com:

No, Luxemburg was 9 KHz higher and 30 Km farther away.

They built a large public swimming pool in the next village because they had the hot water from cooling the plates for free. A construction worker died when he touched the steel cable hanging from a crane.

Yes. And it was unfortunate that the 2 strongest MW stations in Europe were only 9 KHz apart. When you traveled to the Mediterranian sea, they were the only German language stations you could reliably hear.

Europawelle Saar was the natural station for my first detector receiver I built as a kid.

Nobody listens here to AM any more.