RF Interference 4 Mhz

[rs500]

I would appreciate any ideas on the interference shown on the attached photo. The RFI is fairly consistent all the way from around 3.8Mhz to 4.8Mhz with a central drop. The pattern seems quite different from switcher power supply RFI which tends to happen mainly on harmonics. I am wondering about a DSL supply connection from Centurylink as it seems strong around that area.

Looking for ideas.
Thanks, Ron
K2RAS

 

[k9rzz]

Can you provide an audio clip?

 

[rs500]

The audio sounds like simple S8 white noise across the entire 1.1 Mhz spread. There is no noticeable pattern or noise characteristic. Unfortunately I am not setup to save wav files at the moment. Any ideas?

Thanks, Ron

 

[SCPD]

The audio sounds like simple S8 white noise across the entire 1.1 Mhz spread.

In AM mode?

 

[bill4long]

I have a similar problem with my ATT DSL. It is strongest right at the outside box. I tracked it down with my portable SW receiver. It makes 80/75 meters RX difficult. Had the tech come out, and he was clueless about any filter solution. Sigh. I am switching to Comcast because of this next week.

 

[bill4long]

The audio sounds like simple S8 white noise across the entire 1.1 Mhz spread. There is no noticeable pattern or noise characteristic. Unfortunately I am not setup to save wav files at the moment. Any ideas?

Thanks, Ron

If you switch to AM receive mode, does it sound like a "grinding" kind of noise?

 

[majoco]

So what antenna have you hanging on the end of the receiver - what is it's centre frequency?

It really looks like BPL to me.

 

[rs500]

I was listening on SSB, but the noise still sounds like white noise on AM (see attached file). I have a mag loop and dipole antenna. The noise is on both, albeit louder on the dipole.

Ron