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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Electrical Interference
I've got a problem with electrical interference through the tv's and
computer speakers. It's really noticeable when the washing machine is running or fridge compressor clicks in, and when somebody is operating a drill/power saw close by. I got one of those surge protected power boards but they don't help. There's a line filter that's supposed to do the whole house, has anyone fitted one of these things? Do they work? What other options do i have? |
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On Sun, 06 Feb 2005 18:44:59 +1100, bigtom wrote:
I've got a problem with electrical interference through the tv's and computer speakers. It's really noticeable when the washing machine is running or fridge compressor clicks in, and when somebody is operating a drill/power saw close by. I got one of those surge protected power boards but they don't help. There's a line filter that's supposed to do the whole house, has anyone fitted one of these things? Do they work? What other options do i have? |
#3
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bigtom wrote: I've got a problem with electrical interference through the tv's and computer speakers. It's really noticeable when the washing machine is running or fridge compressor clicks in, and when somebody is operating a drill/power saw close by. I got one of those surge protected power boards but they don't help. There's a line filter that's supposed to do the whole house, has anyone fitted one of these things? Do they work? What other options do i have? Where are you located - Country and state? Are you in the city, suburbs, rural, nearest house, nearest garage where drill/power saw is operated, etc? What is your power source? It sounds like it must be a fairly high impedance source, or you have the worst possible luck concerning inferior electronic equipment. The first thing to do is determine if the noise is coming into the electronics via radiated signals, or if it is coming in on the AC power lines. The best way to determine this is with a portable/battery operated am/fm radio. When the interference is occurring, take the radio and place it right next to the AC power line feeding the appliance that is being interfered with. Tune the radio on sam and/or fm until you can hear the same noise in the radio that you see/hear on whatever is being interfered with (EUT). Then, without changing the orientation of the radio, move it away from the power line. If the noise decreases, then noise is most likely being introduced into the EUT via the AC power line. A filter on the input of the EUT should have a positive effect. On the other hand, if the noise from the radio continues as it is moved away from the power line, then you have a radiated noise problem. Only a stronger signal will help. Please provide more info, I have many years solving interference problems and served as president of the IEEE Electromagnetic Compatibility Society so we may be able to figure out what is happening. H. R.(Bob) Hofmann |
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im in Melbourne, Australia out in the suburbs. its a small home next
on its own block of land. the drill/saw noises are only occasional. its the other appliances in my home that cause the main problems. I tried the am radio method next to the washing machine/light switches and the further i move the radio away, the less noise it makes. It sounds like the noise is being introduced through the wiring. Where are you located - Country and state? Are you in the city, suburbs, rural, nearest house, nearest garage where drill/power saw is operated, etc? What is your power source? It sounds like it must be a fairly high impedance source, or you have the worst possible luck concerning inferior electronic equipment. The first thing to do is determine if the noise is coming into the electronics via radiated signals, or if it is coming in on the AC power lines. The best way to determine this is with a portable/battery operated am/fm radio. When the interference is occurring, take the radio and place it right next to the AC power line feeding the appliance that is being interfered with. Tune the radio on sam and/or fm until you can hear the same noise in the radio that you see/hear on whatever is being interfered with (EUT). Then, without changing the orientation of the radio, move it away from the power line. If the noise decreases, then noise is most likely being introduced into the EUT via the AC power line. A filter on the input of the EUT should have a positive effect. On the other hand, if the noise from the radio continues as it is moved away from the power line, then you have a radiated noise problem. Only a stronger signal will help. Please provide more info, I have many years solving interference problems and served as president of the IEEE Electromagnetic Compatibility Society so we may be able to figure out what is happening. H. R.(Bob) Hofmann |
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"bigtom" wrote in message ... im in Melbourne, Australia out in the suburbs. its a small home next on its own block of land. the drill/saw noises are only occasional. its the other appliances in my home that cause the main problems. I tried the am radio method next to the washing machine/light switches and the further i move the radio away, the less noise it makes. It sounds like the noise is being introduced through the wiring. You need a bigger aerial mate. Either a big vertical whip or a long one between a tree and the house. But putting filters on the radio power cord and the appliances will help. Dick Smith or Tandy should have them if you've got a store within cooee. Otherwise try the local blokes. -- N |
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Since it looks like the noise is coming in mostly on the pwer lines,
you will need a filter on the AC power to each receiver that is experiencing the problems. Does it happen on all radios, all frequencies? No problems for your neighbors? You talk about noise on the computer speakers. What are you listening to on your computer? You might also try getting in touch with a local amatuer radio (ham) operator and ask him/her for help. Most hams are happy to lend their expertise in solving these types of problems, and especially if someone isn't blaming them for their reception problems. If this doesn't work, e-mail me directly and I'll try to work with you. H. R.(Bob) Hofmann |
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wrote in message oups.com... Since it looks like the noise is coming in mostly on the pwer lines, you will need a filter on the AC power to each receiver that is experiencing the problems. Does it happen on all radios, all frequencies? No problems for your neighbors? From the sound of it he's out in the wop-wops. He just needs a big aerial to get a better signal. Australia is a bloody big country you know. -- N |
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