... company that sells faraday-type clothes ....
I might grab the DSO and do a spectrum plot if I remember to do it to see just how much crap it is producing.
Yes, many invertors output a "modified sine wave", which essentially is taking a square wave and rounding off the corners, not making a nice, clean, therefore, quiet sinusoidal wave output. "Pure sine wave" invertors solve this problem I believe. Yes, LEDs and CFLs emit spurious harmonics as well. On another subject, Cellphones, WiFi and Bluetooth devices transmit on essentially the same frequency range that a microwave oven uses to cook food on. Most people now are unable to go out into the big wide world for a walk, or wait for a bus or what have you without being glued to their devices. I'm not a doctor, but pressing a device that puts out 600 milliwatts, (that's over 1/2 a watt), of microwave oven power, up against your temple, is probably not the best idea. While doing this obviously doesn't make us drop dead on the spot, I'm wondering if exciting our brain cells to the point of vibrating at the frequency that creates enough heat to cook food, isn't having physical and mental repercussions. Use speaker phone and keep your phone as far away from your body as possible and use plug in data and audio cables instead of wifi and don't use Bluetooth.I've heard inverters really put out a lot of rf noise. I know some led lamps and flashlights do. I use a am radio to see how horrible it is. I tried the cellphone apps and they are a joke.
I once had a led headlamp that I thought worked ok, until I put it near the am radio! Freaked me out! I replaced it with a thrunight and no worries!
I lot of people are getting sensitive to rf and dirty electricity. I heard lead paint was banned shortly after radar became popular. Perhaps it's a em shield?
Microwaves use 900 watts or more , Ham radios put out 100 watts and the louder guys 300+ watts right next to them. Never done me any harm ..HOI ...just twitching me neck..OI.. bugger...I'm not a doctor, but pressing a device that puts out 600 milliwatts, (that's over 1/2 a watt), of microwave oven power, up against your temple, is probably not the best idea. While doing this obviously doesn't make us drop dead on the spot, I'm wondering if exciting our brain cells to the point of vibrating at the frequency that creates enough heat to cook food, isn't having physical and mental repercussions. Use speaker phone and keep your phone as far away from your body as possible and use plug in data and audio cables instead of wifi and don't use Bluetooth.
Roger that bjames, I've worked with 6 to 23 GHz point to point microwave links, straddled hundreds of of live antennas on towers putting out well over 200 watts of effective radiated power and I'm still here. Still, not so keen on exposing my brain to near field microwave oven energy by pressing a transmitter, even at 1/2 of a watt, up against my temple, besides, a cellphone puts out a couple hundred times more power than a microwave oven is allowed to leak! Food for thought!Microwaves use 900 watts or more , Ham radios put out 100 watts and the louder guys 300+ watts right next to them. Never done me any harm ..HOI ...just twitching me neck..OI.. bugger...
I have operated with the 450 to 470 MHz, (the commercial UHF band), bazillions of times! Microwave ovens operate at 2.45 GHz, Cellphones, (up to 4 G), operate up to 2.4 GHz, not enough difference to matter. Microwave ovens are allowed to leak 5 milliwatts as measured at about 2" from the oven, Cellphones transmit at 600 milliwatts which is why I'm not so keen on pressing one against my temple!I hope you don't use a UHF radio set
Yes, capacitors pass AC, block DC, and you certainly do not want to exceed the voltage rating of a capacitor. I also by mistake once upon a time reverse biased an elctrolytic capacitor by hooking it up backwards between the twelve volt positive supply line and negative ground, in attempt to bleed off the popping noise heard when a radio was transmitting. The capacitor blows up fairly quickly and it's very loud and embarrassing!Usually you can clean these things up with a few smoothing capacitors . Big ones across the DC input line . They don't usually bother ,just more cost. Thats probably the sparks we see when we connect them to the battery .Dc does not flow through Caps but dont put them on the 240 a/c side!
There is a very nice sine wave producer board put out now too . I have a couple ,I'll see if I can find the listing.
Its broadband RFI radiating from the AC side. Slapping a big electro on the input won't make much if any difference, wrong thing to use to reduce RFI and in the wrong place. If I was worried I'd use some ferrites on active and neutral.Usually you can clean these things up with a few smoothing capacitors . Big ones across the DC input line . They don't usually bother ,just more cost. Thats probably the sparks we see when we connect them to the battery .Dc does not flow through Caps but dont put them on the 240 a/c side!
There is a very nice sine wave producer board put out now too . I have a couple ,I'll see if I can find the listing.