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RF Interference.
For about four years I have been trying to track down what might be causing interference in my home entertainment and phone system and ever so often I get so frustrated that I post in a newsgroup to see if I might get a lead on how to track down {with proof if outside of my home!} what might be causing this interference. THE EFFECTS: <A> I have this 'BUZZ' that is in 'BOTH' of my phone lines 'IF' the phones are corded phones (can not be heard on the cordless phones!). Some days can almost hear voices in the phone in the southwest corner of my home. [b] Can be seen as large white specks on VHF channels 3 & 12 and as a 'white and black' line moving slowly from the bottom to the top of the screen on UHF channels 27 & 29 that I create in my home with a consumer grade home modulator. (Sony MRDD1 made by ChannelPlus) <C> Some days I can pick-up a local FM station that broadcasts in the 80's on VHF channel 4. <D> There are some areas of the home where you can not use a 900mhz cordless phone that is no where near home electronics. Like at the front door. <E> I get a 'HUM' from two different power strips in two different rooms on two different breakers.(changed strips <brand and style>, and devices plugged in) the power LED would at times 'FLASH' with no device plugged in! <F> I have this little 'Soothing Sounds' electronic sleep aid [work 3rd shift, helps mask traffic noise] that 'HUMS' when no sound is chosen... the worse the 'EFFECTS' on the other devices are the louder the 'HUM'. <1> When it snows the interference goes away!! <2> The interference goes away sometime when it rains very heavy!! <3> The interference seems to be least between the hours of 7am till noon. <4> The interference seems to be the worse between the hours of 6pm till 6am. peaking around 10pm. I have had both KG&E and SWB out, but wouldn't you know it when the service techs show up the interference goes away!! [only during the day time] Using the 'soothing sounds' box found that the 'HUM' is in the power line ONLY goes two house to the west and one house to the east and the houses to the north and south are on different transformers and do not have the 'HUM' KG&E did scope some 'strange' sine wave in my power line one day, but when they moved to the pole the wave was gone. And a hand held RF signal tracker did not pick up anything?!? Any ideas or know of any devices that I might be able to rent (cheaply) that can help me track this interference down?!? I have tried a number of different consumer grade traps, both RF and AC, to try to trap out the interference with no luck. David E. Carmichael ================================================ National 'Onebox.Com' Internet Services: (Dallas, TX, USA) mailto: [email protected] Voicemail / Fax to Internet: (512) 682-6997 ext. 1096 ================================================ V3 URL Redirect Services [ for more info: http://www.go.to ] home page: http://welcome.to/1608alta ================================================ Southwestern Bell Internet Services: mailto: [email protected] Home Page: http://home.swbell.net/dec2955/index.html ================================================ Southwestern Bell Telephone (Services Wichita, KS, USA) Local Voice: (316) 524-0246 Local Voicemail / Fax: (316) 524-9731 ================================================ Signature by www.signature-mail.com |
I had a similiar problem a whiel back and
it turned out to be my line doubler power supply leaking and causing RF interference. Have you tried disconnecting the equipment 1 at a time? Also, don't count out bad power cords or flourescant light fixtures. In extreme case you may need an isolated ground circuit for power. I am not sure what the exact term is but they use an orange outlet. They are highly recommended to protect high end equipment. I do not have this but was told by installers that I should. I have had technicians from power companies and phone companies in my house over the years looking for leaks and am not impressed with their knowledge. If there is a reputable A/V installer in your area they could probable isolate the problem for you. It their area of expertese. I mean from a high end store- not Best But, etc. |
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