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Microwave Oven Interference?!?!?!

Steve-O
04-29-2006, 08:36 PM
Setup-

SAT HD Receiver RCA DT210 in family room
Microwave over in kitchen about 30-35 feet away from receiver
Turn oven on......'searching for satellite signal' message comes on TV!?!?!? Turn oven off, TV signal comes back within 30 secs......

This is a new house <4 years old....RG6 throughout.......my main cable runs are close to the electrical breaker box feed and distribution (microwave wired on dedicated circuit)....could this be the point of interference??.......and if so, how can I shield it??

I am stumped........

TIA,

Steve

maicaw
04-29-2006, 10:16 PM
put a small flourescent tube near it or it's power cord and see if it glows - if it does don't use the microwave.- Unless that's some extra high powered restaurant microwave - say commercial 2kw e.g. designed for special commercial installation - I'd get rid of it - it's defective and potentially hazardous to your health - think cataracts- legally there shouldn't be enough RF radiated energy from devices or cords in a home to affect other household electronic equipment -for safety as well as convenience -- read the FCC caution labels and notes in its user manual for more specifics - commercial equipment has different standards.

Diogenes
04-30-2006, 07:44 AM
The energy could also be conducted as opposed to radiated, put a surge suppressor on the directv receiver to check. Maicaw is right howevere in that either way you should get a new microwave. The surge suppressor test is just for your peace of mind. Cataracts can be removed, radiation induced cancer is harder to get rid of!!

maicaw
04-30-2006, 01:11 PM
radiation induced cancer is harder to get rid of!!
Ionizing radiation is a different hazard than the EMI radiation from household electronic devices -including modern CRTs- visible light, microwaves, and radio waves are non-ionizing radiation...Non-ionizing radiation is thought to be essentially harmless below the levels that cause heating ...http://en.wikipedia.org/wiki/Ionizing_radiation
http://en.wikipedia.org/wiki/Non-ionising_radiation
http://www.icnirp.de/pubEMF.htm

Steve-O
04-30-2006, 09:09 PM
Just a little more info..............it only happens when I have SD channels tuned in.......doesn't happen for HD stations or OTA........
and I gotta say.....all this radiation talk is scarin' the hell outta me.....I got two little ones in the house.........Still confused.


Still,

Steve

maicaw
04-30-2006, 09:55 PM
all this radiation talk is scarin' the hell outta me.....I got two little ones in the house
the $50 microwave is the problem - get a new one!

BrianO
05-01-2006, 01:15 AM
The suggestions to buy a new microwave are somewhat premature. You need to identify the cause of the problem before you can implement a solution. A couple of tests have already been suggested but there are others you can do to try to identify the problem.

A 1200 Watt "consumer" microwave operating at full power consumes about 1350 watts of electricity. On a 110 volt circuit that means it will draw a current of 12.2 amps which will generate a strong enough magnetic field to disrupt the signal on a coax cable (even an RG6) that comes into close contact with it. Can you move your coax cable away from the wiring for the dedicated circuit? If so, try doing that. If not try plugging the microwave into a different circuit that feeds another room. If running the microwave on another circuit eliminates the problem you'll need to have some wiring changes made.

It might also be happening because your coax crosses the eletricity feed into your circuit breaker panel and that it is the total amount of electricity being consumed that is causing the problem, with the 12 amps being drawn by the microwave being the proverbial "straw that breaks the camel's back". Does the problem occur every time you use the microwave? Or only when your regular oven, all the burners on your range top and your clothes dryer are also on? Try turning everything off except the TV and receiver...then turn on the microwave.

Steve-O
05-03-2006, 07:23 PM
The suggestions to buy a new microwave are somewhat premature.


Agreed......it's a top of the line Kenmore (top of the line for Sears :p ) and it's only 3 years old.......


It might also be happening because your coax crosses the eletricity feed into your circuit breaker panel and that it is the total amount of electricity being consumed that is causing the problem, with the 12 amps being drawn by the microwave being the proverbial "straw that breaks the camel's back". Does the problem occur every time you use the microwave? Or only when your regular oven, all the burners on your range top and your clothes dryer are also on? Try turning everything off except the TV and receiver...then turn on the microwave.

I was thinking the same thing......my coax, main electric trunk in and the breaker box are all within a foot of each other.....there's gotta be some electrical interference going on here.....

It's just the microwave each and every time......like I said, it only happens on the SD channels not HD......which makes me think it's a frequency problem?????....SD signals are at a different point in the kilohertz spectrum than the HD signals??

I can't believe that the microwave is leaking EMI's 25-30', but I'll give the flourescent bulb a test too......then maybe I'll try to splice my dedicated microwave circuit into another low load circuit (so as not to trip the breaker) and see if that makes a diff.....

Thanks to all for the replies.......I'll let you know what I find.....


Steve

Quinn77
05-08-2019, 12:54 PM
The wavelength of the microwaves emitted by satellites is usually between 1 and 10 cm. The dishes that emit them from satellites usually have a diameter much larger than this. This produces very little diffraction, giving a narrow beam that does not spread out. As a result, the transmitting and receiving dishes must be aligned exactly. You can see this by looking at a row of houses which have been fitted with satellite television dishes - all the dishes point in the same direction.
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