LPD433 devices are everywhere. Even out in the country where I live if I look at the waterfall display on my Icom IC-9700 on that portion of the band it's just filled with short data burst 24 hours a day. Been a while since I dug into the FCC reg's but I seem to remember the power limit for unlicensed LPD devices was 10mW.
Well, isn't pretty much _everything,_ like _every_ tire pressure monitor in all four or five wheels in every modern car going to be bleeping out RF blurps periodically, yet incessantly, on 433 MHz?
Why didn't you use the pulse trigger to capture the data? That 'scope has the ability to trigger on a negative going pulse with a specified pulse width range. And just for the heck of it how about looking at the data using the RS232 decode? And maybe I should stop making useful suggestions. - grin
Everything here in OZ just about runs on 433.92 meg. My car remotes, the door bell, a street of electric gate openers, retail weather stations, remote power sockets and even the start gun at the running track.
TONS of stuff uses 433 - thermometers (and other weather station sensors), wireless security sensors, remote car fobs, on and on. Anything that transmits a little data intermittently can use it. It's super low cost so easy to integrate into tons of consumer products. There's some software you can use with an rtl-sdr that decoes many known protocols that are typically found at 433
rtl-433 software demodulates a ton of stuff 433/315 devices like tire-pressure sensors, door/window/motion sensors, weather-station sensors and more. Usually uses an rtl-sdr dongle. Not sure if it can directly grok demodulated OOK.
I believe it is to limit what frequencies can enter (preselector). to keep out strong AM/FM broadcast stations. Receive antennas don't need to worry about impedance as much as Tx.
According to the EPA, lithium-ion batteries are a threat to landfills because of their ability to start fires. They didn't mention other possible reasons for recycling like the presence of other potentially hazardous metals like chromium. This seems like flamability wouldn't be a serious problem if the battery was really small (likely the case here) or if was completely discharged prior to disposal...
@@kpanic23 Yeah, you're right. I was confused because lithium manganese dioxide coin cells are not categorized as hazardous waste, so it's perfectly legal to throw them in the trash, although maybe not in CA where the IMSAI Guy lives...
It's perfectly legal to chuck lithium manganese dioxide batteries into landfill, and it's also perfectly reasonable to have reservations about doing it. Indeed, they're far from biodegradable. 😅
if you want a good 180 degree coverage with a little gain over an omni, look at a "moxon rectangle". I did a project with 433Mhz radios a few years ago that needed a slightly directional antenna, as all of the radios were in one direction from the main base radio, and that's what I came up with. You could probably also go with a patch antenna, but it'd be pretty big at 433Mhz
So mystery chip of the day is an MCU. Find the VCC and ground pins and ask ChatGPT to locate all MCUs with eight pins and that power configurations.
LPD433 devices are everywhere. Even out in the country where I live if I look at the waterfall display on my Icom IC-9700 on that portion of the band it's just filled with short data burst 24 hours a day. Been a while since I dug into the FCC reg's but I seem to remember the power limit for unlicensed LPD devices was 10mW.
Well, isn't pretty much _everything,_ like _every_ tire pressure monitor in all four or five wheels in every modern car going to be bleeping out RF blurps periodically, yet incessantly, on 433 MHz?
@@drussell_ Yes and also in the 315MHz range. A lot of the sensors are dual band these days.
@@mikesradiorepair correct, it's the ISM band (as well as 27, 40, 868MHz and 2.4GHz and a few more, I believe)
One of your neighbors have a remote weather station in the backyard?
That's both the simplest and fanciest UHF CW receiver ever! I love chip of the day!
Why didn't you use the pulse trigger to capture the data? That 'scope has the ability to trigger on a negative going pulse with a specified pulse width range. And just for the heck of it how about looking at the data using the RS232 decode?
And maybe I should stop making useful suggestions. - grin
A: I really didn't care that much
Everything here in OZ just about runs on 433.92 meg. My car remotes, the door bell, a street of electric gate openers, retail weather stations, remote power sockets and even the start gun at the running track.
There's most definitely kiwi-initiative local competition for the old 433! They're on to us.
Do you have any car in your garage? Maybe it's a TPMS (Tire Pressure Monitoring Sensor) sending data on 433Mhz
Also maybe a "Smart" key?
"a hand pull of farts?" - did I hear that correctly? 😂😂😂
a hand full, a hole full, but you can't gather a bowl full
Digital thermometers use 433 mhz
TONS of stuff uses 433 - thermometers (and other weather station sensors), wireless security sensors, remote car fobs, on and on. Anything that transmits a little data intermittently can use it. It's super low cost so easy to integrate into tons of consumer products. There's some software you can use with an rtl-sdr that decoes many known protocols that are typically found at 433
Just make a little bit QRO around that frequency 😁🤭
rtl-433 software demodulates a ton of stuff 433/315 devices like tire-pressure sensors, door/window/motion sensors, weather-station sensors and more. Usually uses an rtl-sdr dongle. Not sure if it can directly grok demodulated OOK.
330 KHz bandwidth! Can't get good sensitivity listening to all that noise!
Man are these things a folly and complete waste of resources. But at least it makes for an interesting video 🙂
I think those reactors are for impedance matching to the antenna.
I believe it is to limit what frequencies can enter (preselector). to keep out strong AM/FM broadcast stations. Receive antennas don't need to worry about impedance as much as Tx.
According to the EPA, lithium-ion batteries are a threat to landfills because of their ability to start fires. They didn't mention other possible reasons for recycling like the presence of other potentially hazardous metals like chromium. This seems like flamability wouldn't be a serious problem if the battery was really small (likely the case here) or if was completely discharged prior to disposal...
Very unlikely that it was a lithium-ion battery, probably just a normal lithium manganese dioxide coin cell (CR2032), since he said it was 3V.
@@kpanic23 Yeah, you're right. I was confused because lithium manganese dioxide coin cells are not categorized as hazardous waste, so it's perfectly legal to throw them in the trash, although maybe not in CA where the IMSAI Guy lives...
@@ats89117 Yeah, regardless of chemistry, batteries aren't exactly biodegradable... 😄
It's perfectly legal to chuck lithium manganese dioxide batteries into landfill, and it's also perfectly reasonable to have reservations about doing it. Indeed, they're far from biodegradable. 😅
Landfilles? Doesn't all used electronics get treated at an E-waist recycling facility?
We have done that for many years.
In the US it depends where you live. I think mostly things like this go in the landfill.
LOL... No, *most* places in the US haven't even _begun_ to think about things like recycling electronics. Oh, *MY,* no! 🤣
How would you make a directional antenna which worked at 433MHz?
google '433MHz YAGI'
@@IMSAIGuy Also look for 70cm yagi since 433MHz is in the 70cm ham band.
if you want a good 180 degree coverage with a little gain over an omni, look at a "moxon rectangle". I did a project with 433Mhz radios a few years ago that needed a slightly directional antenna, as all of the radios were in one direction from the main base radio, and that's what I came up with. You could probably also go with a patch antenna, but it'd be pretty big at 433Mhz
Hello sir. Can you make tutorial how make jammer signal cell phone
no
@@IMSAIGuy some pretty sweet answers today :)