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If it is 10+ during the day time but drops off at night to substantially less it doesn't sound like the transformer causing the noise.

Transformers tend to radiate consistently when they have poor connections--24/7 with only monor changes. Just a bit of non-linearity can cause a lot of harmonics on the secondary coil. Usually if it RF noise it will be on 160 or 80 meters. You definately should call your power company's customer service office. They should be helpful. (I would refrain from any mention of shooting at transformers, however...)

The company I work for takes RF reports very seriously, since the corroded conections that usually cause it also have high resistance and can generate heat that may cause them to fail.

Again though, if the RF level changes that much from day to night it may well be TVI in reverse. May TV receivers use oscillators with fundamental crystal frequencies of 1.8432MHz, 3.6864 MHz, or 3.579545 MHz. You might check ot see if the noise is on or near those frequencies in particular. Even with the shift to digital TV there are a lot of devices that use these fundamentals to produce signals, including DV players, VCRs (there are still a few around) and even video games. Anything with a channel 3 or 4 F connector output.

I was a bit embarrased once when I called our customer service folks about 80 meter noise, and it turned out to be coming from a VCR in the next room of my house--on the opposite side of the wall my rig sets against. The techs thought it was funny, but the XYL laughed for weeks....

Dave_W6DPS

<blockquote data-quote="Dave_W6DPS" data-source="post: 150744" data-attributes="member: 2967">If it is 10+ during the day time but drops off at night to substantially less it doesn&#039;t sound like the transformer causing the noise.Transformers tend to radiate consistently when they have poor connections--24/7 with only monor changes.&nbsp; Just a bit of non-linearity can cause a lot of harmonics on the secondary coil.&nbsp; Usually if it RF noise it will be on 160 or 80 meters.&nbsp; You definately should call your power company&#039;s customer service office.&nbsp; They should be helpful.&nbsp; (I would refrain from any mention of shooting at transformers, however...)The company I work for takes RF reports very seriously, since the corroded conections that usually cause it also have high resistance and can generate heat that may cause them to fail.Again though, if the RF level changes that much from day to night it may well be TVI in reverse.&nbsp; May TV receivers use oscillators with fundamental crystal frequencies of 1.8432MHz, 3.6864 MHz, or 3.579545 MHz.&nbsp; You might check ot see if the noise is on or near those frequencies in particular.&nbsp; Even with the shift to digital TV there are a lot of devices that use these fundamentals to produce signals, including DV players, VCRs (there are still a few around) and even video games.&nbsp; Anything with a channel 3 or 4 F connector output.I was a bit embarrased once when I called our customer service folks about 80 meter noise, and it turned out to be coming from a VCR in the next room of my house--on the opposite side of the wall my rig sets against.&nbsp; The techs thought it was funny, but the XYL laughed for weeks....Dave_W6DPS</blockquote>

[QUOTE="Dave_W6DPS, post: 150744, member: 2967"] If it is 10+ during the day time but drops off at night to substantially less it doesn't sound like the transformer causing the noise. Transformers tend to radiate consistently when they have poor connections--24/7 with only monor changes. Just a bit of non-linearity can cause a lot of harmonics on the secondary coil. Usually if it RF noise it will be on 160 or 80 meters. You definately should call your power company's customer service office. They should be helpful. (I would refrain from any mention of shooting at transformers, however...) The company I work for takes RF reports very seriously, since the corroded conections that usually cause it also have high resistance and can generate heat that may cause them to fail. Again though, if the RF level changes that much from day to night it may well be TVI in reverse. May TV receivers use oscillators with fundamental crystal frequencies of 1.8432MHz, 3.6864 MHz, or 3.579545 MHz. You might check ot see if the noise is on or near those frequencies in particular. Even with the shift to digital TV there are a lot of devices that use these fundamentals to produce signals, including DV players, VCRs (there are still a few around) and even video games. Anything with a channel 3 or 4 F connector output. I was a bit embarrased once when I called our customer service folks about 80 meter noise, and it turned out to be coming from a VCR in the next room of my house--on the opposite side of the wall my rig sets against. The techs thought it was funny, but the XYL laughed for weeks.... Dave_W6DPS [/QUOTE]

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