Anybody recognize this noise?

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  • Updated 4 months ago
I get this noise on 17mtrs - I don't see it any other ham band or any place I have looked at on the panadapter.  It is about S6 signal strength and at times shifts up and down sometimes as much as 40-60 khz -- maybe more.

I have not tried to shut off everything in the house and run on battery yet but have seen this noise ever since I got my 6400.  Prior to getting the 6400 though I seldom used 17mtrs.



I am heading for bed but will check tomorrow and see if anyone has any ideas what this might be.

---Gary WB8ROL
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Gary L. Robinson

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Posted 4 months ago

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KK9W - Steve

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I've got a  similar to that on 80m here in New England
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Craig Williams

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The hump in gain is your antennas bandwidth. Short your antenna or disconnect it and it should go flat. Should see this on other bands also.
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Danny K5CG

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Or your tuner.
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Gary L. Robinson

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No, it's not the antennas' bandwidth.  The noise changes frequency at times both up and down several khz without doing anything but watching it.  Antenna bandwidth is plainly seen when I widen the bandwidth of the slice and it is a more gradual curve.  At a slice 7mhz wide I see nothing else that remotely looks like that noise and I can see the bandwidth curves for the antenna.   I can also rotate my beam antenna and null out the noise when pointed due south.  And I have tried several other antennas and see the same noise.  This is the ONLY band I see it on and I suspect man made noise but not sure where or how it is being generated.
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James Whiteway

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Had something similar with a neighbors failing A/C system. Why it was only showing up on 20 meters I have no clue. But, that was the only place it showed and only when the unit was running. Once it finally died, it went away. Thankfully, they have a new unit and it's quiet
.james
WD5GWY
(Edited)
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Gary L. Robinson

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Hmmmm.  I will check my own old failing A/C system when I can turn it off.  If I tried that right now I would not win any points with the XYL who is asleep running the A/C in the bedroom hihi
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Winston VK7WH

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Can you show us both the panadaptor and the waterfall display, as the waterfall might give further clues
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Gary L. Robinson

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I'll do another screen capture with both panadapter and and post it later.  In a ragchew right now ....

---Gary
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Gary L. Robinson

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Here is a screen shot of the noise with the panadapter and the waterfall.  It sounds like a rough electrical noise of sorts.  And it moves back and forth occasionally but keeps basically the same or similar width.



---Gary WB8ROL
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Winston VK7WH

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Thanks Gary. I can't recall seeing anything like this before., although it sure looks local. Certainly worth switching the AC off when the time is right.

Winston
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Gary L. Robinson

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Well, it's not local in the house - turned everything off and still saw it this afternoon.  But I think it is local to the small village I am in or not too far away.  I may in the future borrow my brother's FM handheld (forget model) that also covers HF bands for RX.  It's a great tool for tracking noises hihi

---Gary WB8ROL