General > General Technical Chat
Microwave weapons?
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jmelson:

--- Quote from: djacobow on September 01, 2018, 07:27:24 pm ---I was surprised to hear that you can induce auditory hallucinations with microwaves. Still, the article has no info on power levels, frequency, etc.  But if you can create auditory hallucinations, it's not a long leap to nausea.

--- End quote ---
Well, talk to anyone who has had an MRI done, especially of the head/neck area.  They now run insane amounts of RF power to wobble the Hydrogen atoms, like 13 KW pulsed.  Also, they run strong AC magnetic fields to introduce the magnetic gradient.  The gradient coils make clunking/chattering noises, but the patient hears all sorts of higher frequency noise from the RF.

Jon
chris_leyson:
@coppercone2 Maybe your head is too thick
--- Quote ---I did non-up-against-my-head experiments with microwave AM modulated by music
--- End quote ---

--- Quote ---Tried like depache mode iirc.
--- End quote ---
Thankyou for your scientific insight.
radar_macgyver:
I call BS. In my experience, as soon as people know that something emits microwave RADIATION, they start running scared. Case in point: we completed installation of a new radar antenna under a dome on a tower. Dome is visible for several miles around. Due to long lead time on waveguide, we couldn't hook up the transmitter to the antenna for several weeks. Sure enough, in that time, we got at least two complaints from people living nearby that their WiFi stopped working and that their satellite TV stopped working.

For a while after I started working at my current job, I could swear I 'heard the radar PRF' while eating lunch, about 100 meters away from an S-band antenna with a 1 MW transmitter attached. It turned out one of the techs had a police scanner set up at his desk, with the squelch turned on. When the radar scanned across the building, enough signal broke through the squelch that I could hear it down the hall. Felt quite silly when I found out.

Years later, in the same lunch room, I thought I heard weird high pitched sounds that were very difficult to localize. After much effort and help from a colleague, we tracked the noise to a Wifi router. It was a dried out cap in a switch mode supply that caused the coils to vibrate. Swapped out the cap and the noise went away.

Yes yes, anecdotes are not evidence, but I'm willing to bet there's a more benign explanation for all this.
coppercone2:

--- Quote from: chris_leyson on September 02, 2018, 02:10:19 am ---@coppercone2 Maybe your head is too thick
--- Quote ---I did non-up-against-my-head experiments with microwave AM modulated by music
--- End quote ---

--- Quote ---Tried like depache mode iirc.
--- End quote ---
Thankyou for your scientific insight.

--- End quote ---

how would you do the experiment?

In a MRI I had no idea if its the machine buzzing mechanically or induced.

You could make really cool headphones if it worked.
jmelson:

--- Quote from: chris_leyson on September 02, 2018, 01:44:58 am --- I'm surprised that Uncle Sam didn't make any effort in detecting the so called weapons.

--- End quote ---
Oh, you can BE SURE that they did!  I know nothing, but even in friendly countries they have communications security people who are constantly checking for unexpected RF emissions.  Most of the time it would be either authorized devices that are malfunctioning or unauthorized devices that have been brought into the building.  But, this would also pick up signals from outside that are coming in.  I do know that the US government had portable RF scanning kits in a suitcase in 1968, I'm sure what they have now is WAY better.  One of the problems with this sort of thing is even if you know a problematic signal is coming in, it can be really hard to tell where it is coming FROM, especially if the creator is turning it on an off and moving the source around.

Once detected, they have to figure out who is doing it, WHY they are doing it, and what to do about it.  A lot of this stuff is kept under wraps, we go and complain to the corresponding agency and say "We KNOW what you are doing at location X, and if you don't cut it out, we are going to make things REALLY difficult for you at location Y."  The Russians had at least two hilltops site in the US where they were intercepting all sorts of important communications, and they were forced to vacate those locations.  This MIGHT have been the retaliation for the "sonic" thing, but I don't recall the exact timing of all this.

Jon
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