[RFI] carried powerline noise on 15m and 20m

[Jim Brown]

On 2/15/2022 6:43 PM, Ignacy Misztal wrote:
> My radio shows about S4 noise on15m when the beam is oriented towards the
> nearest power pole. 

What else is in that direction? One or more houses?  A city? Any towers 
that hold antennas for 2-way or cell systems?

Especially at higher frequencies like you're hearing, power doesn't 
travel very far on wiring -- instead, the wire(s) near the source are 
transmitting antennas. The fact that it's not very loud in your radio 
suggests that the source is not very close.

> There is S3 noise on 10m and almost none on 20m and below. 

What's the spectrum of the noise? Does it peak at different spots in the 
bands, or is it about the same strength anywhere you tune? That could 
yield a clue as to whether it's power line noise or electronic noise.

http://k9yc.com/KillingReceiveNoise.pdf

The noise is canceled completely with NB so I assume it must be from
> a single source. 

Not necessarily -- it WOULD be if noise cancelling could reduce it a lot.

73, Jim K9YC