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Help! 80m - Every 65 kHz - Cycles Every 60 Seconds Jan 20th 2022, 11:20 2 4,040 on 20/1/22

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Weird interference, every 66 Khz N1LOU on 20/1/22
Please check my post from today. I have this on 80m, but it is audible and cycles on/off every 60 seconds.
Help! 80m - Every 65 kHz - Cycles Every 60 Seconds WR4N on 20/1/22
Please, can anyone help? A couple weeks ago, HF RFI appeared that is audible and visible on my monitor. It presents as follows. (1) It raises the noise floor with hash on all HF bands. (2) On 80m, it is the worse! (80m antenna is dipole fed with LMR 400). Noise floor is now S-9, but every 65 kHz there is a S-9+15db noise; it is constant, but cycles on/off every 60 seconds (the rise and fall of this particular, wide spike, takes less than 1 second). (3) On 10m-20m, noise floor is S-6, but when I beam between 300-360 degrees, it rises to S-8. So, it would appear I may have the general direction, perhaps 330 degrees.

Using a small AM radio, I have swept my house. I can't detect anything that would cause this. My neighbor has an HVAC unit that is in the direction of around 330 degrees (but AM radio doesn't denote strong RFI from the unit); he is willing to turn off his unit for a couple minutes, so I can see if his HVAC is the cause. I am waiting on him to have an opportunity to help me test this.

Does anyone have any ideas or thoughts, any experiences with RFI that cycles on/off every 60 seconds and takes place every 65 kHz? Does anyone have recommendations for an RFI detector that won't break the bank?

Huge Thanks & 73,
David WR4N

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