>
>
>
>
> Check the ARRL web
> site, quite a few articles on EMI.
>
http://www.arrl.org/tis/info/rfi-elec.html
>Jerry - K0HZI
>
>
>
>
>
>
>Hi All,
>
>Have had a terrible time finding interference sources and been battling the
>power company for over seven, yes, seven years. But, that is a whole story
>in itself. Right now I am at wits end trying to locate the source.
>
>Here's the problem. S7-9 Noise Level (worse when it is drier) on 10 & 12
>meters with other bands being affected depending on how dry the weather is.
>160 meters is S 7 at night. A sweep of 1710 KHz AM broad cast band
>indicates
>peaks on the power line at what appears to be irregular intervals over a 1
>mile stretch.. An MFJ Noise meter indicates one small source about 3/4 mile
>away. However, I do not feel this is the source. As night falls, the noise
>lessens a bit to where I see 2 peaks from the radio station indicating the
>same direction as the peaks on the power line. An interesting phenomena
>occurs on 1020 KHz, KDKA's 50 KW station which is about 3 miles away, the
>noise totally obliterates the signal at one of the noise peaks on the power
>line.
>
>The power company is blaming neon signs from a small strip mall located at
>a
>further distance from peaks on the power line. A sweep with the MFJ box
>indicates that indeed these signs are very noisy. After a polite discussion
>tonight with the noisiest sign owner, we turned off 3 signs. There was no
>change on the receiver noise at home, which the XYL was monitoring. There
>are 2 more signs to check, 1 is the marque sign which will require more
>effort to locate the strip mall owner and another store where I know the
>owner. However, the owners have turned these signs off in the past, which
>did not correct the problem. Going to double check to be sure.
>
>A sweep of the local 1 -2 mile area with the MFJ box indicates no local
>noise generating from the usual troublesome door bell and touch lamps.
>
>I have the ARRL RFI book and tried their suggestions but coming up blank.
>Is
>there any way to tell from the sound of the noise as to what it may be
>coming from? It sounds more like a buzz than a crackle, if that makes
>sense!
>Talk about being at wits end! Any suggestions would be greatly appreciated.
>
>Thanks to all.
>
>73,
>
>Bob
>K3GT
>
>
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>
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>
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