[RFI] RFI Source - looking for clues\help

[Mike Martin]

Brad, because of the time of year don't roll out this thing being a heating pad or electric blanket. both of those as well as the doorbell and recycling recessed lighting create the same type of cycling noise.

⁣Happy New Year,
Mike

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On Jan 3, 2021, 7:47 PM, at 7:47 PM, Mike Martin <mike at rfiservices.com> wrote:
>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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