I wasn't suggesting a consumer product. But a skilled RF engineer could build one himself. I spoke to one local guy who has built his own radar.
400 MHz UWB has law enforcement and military use cases & has also been tested for passively monitoring vital signs in health care settings. See...
The concern is not exposure to ~400MHz at -67 to -73 dBm. The concern is a privacy / harassment concern as there are things happening that suggest someone is aware of our movements in the home & is using that information to engage in a sound / vibration harassment campaign.
This is why I am in...
I can pick up various WiFi signals (~2400 MHz) as well.
The first item in the link you sent was an "acoustic surveillance transmitter" & that is what my remark was about. I think most people would be troubled by this. But if that makes me paranoid - that's fine.
The mic allegedly can be accurate down to 10 hz - but only guaranteed to 20 hz. The mic was in a stand on a solid structure but not on foam.
There could certainly be some error in the exact frequencies and dB levels, especially below 10 hz. However, I can tell you there are physical sensations...
Thanks for the link. Must say that is a troubling possibility as well!
So countermeasures for either an acoustic surveillance transmitter or IR-UWB radar would be... a jammer or signal generator of some type?
What could be producing this infrasound in my home? (see image - 2 & 4 Hz around 75dB, 7 & 9 Hz about 60dB)
It's a residential neighborhood and there are no industrial or commercial buildings for miles. Location is KC suburbs - no windmills nearby. HVAC was not running when this was recorded...
See video below of continuous 24/7 stream of 397-434 Mhz signals in my home (dBm between -67 and -73) measured with GQ EMF-390. Scanned everything in the house, basement & garage and nothing we have is emitting this.
https://youtu.be/1kl9BqL91fw
Suspect nearby neighbor (who is an engineer) may...
