[RFI] Fw: 40M RFI

Dave Cole dave at nk7z.net
Sat Feb 6 22:22:47 EST 2021

Check out:


That will give you some tools to quantify the issue.

Then check out:


That will give you more info to assist in this...

73, and thanks,
Dave (NK7Z)
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 2/6/21 7:18 PM, w6jh--- via RFI wrote:
> This RFI starts up each evening. It's not present during the afternoon and usually doesn't start until well after dark I did notice it earlier this morning well after sunrise. It was gone later in the day. It starts as several narrow "humps" walking across the panadapter from lower to higher frequency. They appear at first as almost horizontal sweep lines on the waterfall gradually curving upward to vertical and after 20 or 30 seconds settling into the pattern seen below. I can't seem to correlate it to anything in the house. I suspected my neighbor's energy saving, variable speed pool pump because the startup pattern makes me think it's rotating machinery. However, I think his pump was running this afternoon while the rfi was NOT present, and vice versa this evening. It's most pronounced on a vertical, I can see it a little on an inverted vee. It extends above and below the 40 meter band, but I don't see it on 80M or on 30M. Any idea where to start looking?
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