does welding cause RF interference in the 8 GHz range?
89990
It would depend on the distance to the receiver/antenna..close distance:yes
1176223
There are few things that can actually stop a wireless signal, one of which is certain types of aluminum. Another thing, for example, is direct distance in feet. A room "right next to it" could actually be a greater physical distance than the room above it.
524846
B'coz wavelength decides the power gain that transmitting antenna should have .\n& distance that can be covered by signal also depends on wavelength.
1061136
Simply because microwave radiations impart energy to atoms and molecules in the crystal structure. Materials which can withstand the induced extra energy are safe, others are not.
34625
200mW is both safe and legal IF it doesn't produce a signal that overlaps the 2.483 - 2.500 GHz restricted band at greater than +19 dBm. \n\nThe WRT54G is capable of producing a relatively clean signal up to about 80mW, but driving it harder than that will create a "dirty" signal with undesirable harmonics and side lobes, which could disturb the OFDM of adjacent channels.\n\nThe rule is - don't use any more power than you absolutely have to.  Doing so can lead to both unintended (possibly illegal) signal emission and reduced life of the components used, due to the higher power dissipation.\n\np.s. A previous answer discounted legal aspects because you're transmitting "for personal use".  This is NOT correct.  FCC regulations regarding allowable power and signal quality limits DO apply to personal use.
362672
Radiowaves, look it up.\nAnd you definately got the category wrong.
93949
Frequency 480 - 405 thz (terahertz)
763502
Don't do it!  EMI - electromagnetic interferrance.  The data signals in the cat5 cables will be corrupted.
1041368
Generally, I'd say transfering energy using a microwave beam would be hazardous to anything living in the beam, however, it depends on the intensity, or beam density. If you're transfering enough energy to be usefull, I'd say it was dangerous, unless the beam was very wide, and your collectors were very large, then the beam density would be low, but such an unfocussed beam would be inefficient. \nMicrowave radiation is all around us, naturally and artificially generated - background radiation, line of site communications, radar guns, etc.....
141854
Ok, so some people should not be posting answers here.\n\nRadio waves do not pass through all objects.  It depends on two things, the dielectric constant of the object and thus the frequency of the radio wave.\n\nFor example, if you have a conductor (copper, or aluminum or iron) it will reflect the radio waves.  The waves will not pass through the object.\n\nFor most objects that are not conductors, when you pass from free space (air) to a solid like concrete, a portion of the radio wave will reflect off the surface (a small portion), some of the energy of the wave will be absorbed by the object, but the rest of the wave will pass through. \n\nDepending on the thickness of the material and the frequency of the signal, and the dielectric constant of the material, sometimes radio waves will not pass through the object.  As the signal travels through the material, it will continuously lose active power (heat) and reactive power (stored energy like in a capacitor).\n\nIf you were to compare the signal strength before it hits the wall, and the signal strength after it leaves the other side of the wall, some energy would have been lost.
167673
you can only run so many things on soo many frequencies, if everything was wireless we would all have brain cancer from the emi and everything would interfere, just like when your cell phone goes off and it makes your computer screen twitch
108576
It has to do with horizontal and vertical lines of magnetic propogation, and it also deals with the way that EMI fields of energy will dissipate from an antanae when a volatage is applied through it.\n\nBasically you will use different shaped antenna to get better RF coverage to certain areas.
1051141
Atmospheric interference.
736491
********************************************************\n\nIf you ask me, one of the cleverest parts of a microwave oven is the door. It lets you see into the oven to make sure your potato isn't about to explode, yet keeps your face from being cooked off by microwaves in the process. It accomplishes this remarkable feat with a metal mesh—basically a sheet of metal with a regular pattern of small holes drilled or punched in it. This, along with the metal material of the oven cavity itself, forms a sort of reverse Faraday cage. A Faraday cage is a metal enclosure that normally keeps electrostatic fields and RF (radio frequency) radiation from getting in, but in the case of the oven, from getting out.\n\nA solid sheet of metal would be the most efficient at containing RF, but since you can't see through metal (unless you happen to be Superman), a compromise must be made. How much RF escapes through the mesh depends largely on two factors: the wavelength of the radiation in question, and the diameter of the holes. (For you picky types, the conductivity of the mesh material has a slight but negligible effect, as does the shape of the holes, among other things.) The shorter the wavelength of the RF, the smaller the holes need be to block the radiation. Microwave ovens operating at 2450 MHz emit radiation with a wavelength of about 12 centimeters, and the holes in the mesh of the door are typically on the order of 1-2 millimeters in diameter. Since the holes are small compared to the wavelength of the microwaves, little radiation can leak out. There are also mesh screens on the sides of the oven cavity, one to protect the oven light while allowing it to shine into the cavity, the other to permit ventilation.\n\nThe FDA has set emission standards for new microwave ovens at a power density of 5 milliwatts per square centimeter at a distance of 5 centimeters from any point on the outer surface of the oven. Typical new ovens have a leakage of only 0.2 mW/cm2 at that distance—a tenth of the FDA standard. Dirt, mechanical abuse and everyday wear and tear can eventually reduce the effectiveness of the door seals, thus increasing leakage. If you're concerned about emissions from an older oven, you can purchase leakage sensors at many hardware and home improvement stores or online. Keeping the seals on the oven and door clean, as well as opening and closing the door gently, will help keep your oven safe to use. So go ahead and ogle your latest culinary masterpiece while it cooks. Your food will cook, but your head will not. Or so one certainly hopes. \n\n**************************************************************
729826
I know that you said that you tried shorter and longer cables. I believe that it has to be the cable. You would actually make things worse from an inductance standpoint with the cable coiled. There HAS to be a point where a straight cable will work - even if it's a short patch cable.\n\nAlso considering that you lay the cable on the ground. Are you on top of any kind of EMI source? Sprinkler, spa, or pool pump maybe? Go out there and listen with a portable AM radio to see if you can hear some humming or severe interference.\n\nThe PoE seems to not be a factor in this case.
645231
Signals can be affected by multipath issues, where the radio signals reflect off surrounding terrain- buildings, canyon walls, hard ground, etc. This delay in reaching the receiver causes inaccuracy.
262145
Any distraction in a manufacturing plant is a safety issue. Remember, one person's radio station is another person's pain in the butt.