[RFI] Line noise vs Frequency

[qrv at kd4e.com]

If the rain is stopping it - perhaps the conductivity of the soil is a 
variable?

I seem to recall that they have a soil additive to improve grounding. (Salt

works, but eats the wire!)

Just a thought ...

kd4e


> Interesting you would bring this up. My current 120hz target peaks at 
> roughly 19.5mhz. Falling off below roughly 10mhz to where its almost 
> insignificant and goes up to about the 2 meter band where its very 
> weak with directional antennas. I started hunting it after the power 
> co fixed my primary source back in the spring. I had isolated to a ~3' 
> area of ground wire stapled to the pole, I think. 7.2kv 3 phase pole 
> with lots of hardware so not easy to tell with ultrasonic dish. I 
> wanted to do some more investigating but then came the high Tennessee 
> humidity for the summer and the target has been >98% absent.
>
> I greatly suspect it will return more frequently with the lower 
> humidity in late Sept/Oct forward. A few days ago the humidity got 
> down to close to 60% and it returned for a few hours.
>
> Its on a pole in my back yard thus very close in proximity to my 
> antennas. As to why the peak, I would be interested to know also. Some 
> of the utility hardware of such a length it resonates on a certain 
> frequency? Just a guess.
>
> One thing is for sure, an open mind is essential to hunting this 
> stuff, lol. My biggest surprise is finding 3 sources on 2 poles so far 
> related to the stapled ground wire. The one they fixed I actually saw 
> it arcing with binoculars. Another due to a crepe myrtle growing 
> around the pole (and stapled ground wire). Cut the limbs off it and it 
> was gone. And this third one that appears right now to be related to 
> the stapled ground but that has yet to be resolved.
>
> Chuck
>
> W4NBO
>
>
>
> On 8/8/21 7:24 AM, Pete Smith N4ZR wrote:
>> A (probably) dumb question:  I have a severe line noise to my west. 
>> For some reason it is manageable on 20, much worse on 15 and 
>> crippling on 10.  These subjective descriptions are confirmed on my 
>> S-meter. Why would this be happening, and does it offer any helpful 
>> clues to finding the source?