[RFI] RFI Source - looking for clues\help

[Mike Martin]

Brad I think your primary noise is a arcing source, most likely a doorbell transformer or recessed lighting. the other noises I don't think you would even know were there if it weren't for the big noise coming on. the cycling on and off is typically due to temperature and it may not be outdoor temperature but inside temperature. Those devices mounted inside a house will change with the temperature of the house. Sometimes real hot will cause it to stop sometimes real hot causes it to begin. Most importantly don't worry about what it is until you find where it is. I would suggest using VHF to locate the cycling noise source. HF is going to allow you to hear many things you really don't want to hear. The arcing source will affect VHF and make it much easier to locate. When it's on at your home start your search frequently checking back to see if maybe it stopped. This will typically be in a home that's on the same transformer connected to your house however it could be much further. The source you have doesn't appear to be extremely strong so it could be some distance away. I hope this helps. You're welcome to call me for any pointers on what to do when you locate it or steps to take two located.
mike at rfiservices.com

⁣Have a Merry Christmas,
Mike

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On Jan 1, 2021, 8:17 PM, at 8:17 PM, Brad Denison <brad.denison at gmail.com> wrote:
>No new motor driven equipment and the noise was still present when the
>house was powered down.
>
>
>
>>I have some general RFI location tips at my web site, www.nk7z.net...
>>Whateverr it is, I bet it has a motor in it... You didn't by chance
>get a new HVAC did you?
>
>>73, and thanks,
>>Dave (NK7Z)
>>https://www.nk7z.net <https://www.nk7z.net/>
>>ARRL Volunteer Examiner
>>ARRL Technical Specialist, RFI
>>ARRL Asst. Director, NW Division, Technical Resources
>
>On 1/1/21 5:30 PM, Brad Denison wrote:
>
>Well, 2020/2021 transition is starting off poor with some new RFI
>killing
>my SE directional RX antennas.  From this direction I am hearing a
>broad
>hash with a "musical whine" .  It seems to be a fairly consistent
>on/off
>cycle, however, I have noticed the cycle duration change depending on
>the
>day.
>Would appreciate any insight if anyone has experienced anything
>similar.
>To date I have done a full house power down test and also walked the
>area
>with a small AM handheld (which does not hear anything locally).
>
>
>A picture of the RFI is here:  http://bit.ly/3hwzwUg
>
>Short cycle audio here:  http://bit.ly/34ZtbeS
>
>And longer cycle audio here:  http://bit.ly/3hE3TYP
>
>Hoping to stir up some help or suggestions.
>
>
>HNY,
>
>Brad W1NT
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