Wavelength and Frequency of Absorbent Materials

Contact the Defense Department of almost any country, say the G8's, they're working on the subject right now, it's called Electronic Warefare. The best of luck obtaining information.

Not my realm at all... (acoustics, yes ~ RF, No)... but, I would think that the answer would be "an antenna array with a scanner setup" (for lack of a better way to put it).

What kind of "unknown frequency" are you concerned with? (SETI stuff...?)

Best Regards ~

Im looking for a cheap ,effective way to block/absborb an unknown frequency in my own living space. not a cell phone , older radios I believe.

The links from 'Guest' appear to be pointing you in the right direction (from my own "ill-informed-on-the-subject" standpoint, anyway). They certainly shed substantial luminance, providing fragments of understanding for myself.

Having misinterpreted your original post, I now assume that you are experiencing some degree of interference of some kind (?)... perhaps akin to the TV interference our family experienced some years back from the ham freak that lived next to us.

Regardless ~ to inquire of any 'experts' who enter the thread here: I remain puzzled by the statement made in response to my previous post ... that the frequency can't be determined by (any) antenna/scanner type of setup. Is there an "upper limit" to the frequencies that current antenna technology can detect? (I would think not.)

I wasn't imagining a rhombic antenna-array, but rather something "state-of-the-art", like a tunable "nitinol-mesh" antenna, or some other "movie-grade" technology.

Tuning-in for any responses ---

It looks like you can buy hand held frequency counters that detect from a few megahertz up through several gigahertz for a few hundred dollars. It appears they are fairly sophisticated devices.

Spectrum analysers on the other hand are still too high, I don't understand why that is.

A feller could do a lot with an old multi channel drum chart, some capacitors, chokes, and resistors; at least looking at the most dangerous freqs. What I like about an old drum chart is that it provides the capability to monitor for intermittent exposure. Fed by the right detection circuits it could, at the least, detect exposure and give a rough indication of field density. Dedicate each channel of the chart to a specific band width until something of interest shows up on one of the channels. Then, dedicate two or more of the channels to the specific band width of interest. By using a combination of antenna position/polarization and chart needle deflection one should be able to get a approximate bearing on the source. It may not be real sophisticated but its cheap and effective.

Scary note - wonder how long it will be before someone figures out how to use the PC wireless device to give ya a little pinch. Maybe now?

Gavilan

How did you detect it and what makes you think it is at the micro-wavelength?

because i stuck a microwave oven over it and all signal was lost!

"I stuck a microwave oven over it and all signal was lost!" ????

How are you detecting the signal?

Microwave shielding is very easy, the frequencies that present the greatest threat to human health are a little more problematic.

Attempting to mitigate environmental residual field and detecting/countering surveillance or assault is a whole different ballgame.

I not into playing any games, if your seeking some ideas on detection, locating, and mitigation I think I may have some ideas and resources that you might find helpful but your going to have to give me some reasonable information, or just get your check book out and call in the pros.

I'm ready to listen.

Gavilan

I would prefer to communicate with Gavilan on a less public forum as this event is sensitive in legal terms.

gary.g.greenwood@gmail.com

No, you cant´t detect the wavelength that way.

look at:

http://www.eccosorb.com/

or

https://www.hitek-ltd.co.uk/