One for the Boffins....

#1
Is it possible to build a long range detector (up to one mile) of devices operating in the 15.75 KHz waveband?

I believe there is one short-range , and I mean up to 15' on the market, but what would be needed to build one that operated at greater ranges?
 
#3
Do you intend to break into somewhere but want to be sure that you're not on CCTV?

(I, also, can only find max 15' range)
 
#4
LOL! Bugger , rumbled.

Need something that will detect handheld video cameras , I presume they are on the same frequency , or are they different?
 
#6
PartTimePongo said:
LOL! Bugger , rumbled.

Need something that will detect handheld video cameras
You're going 'dogging', aren't you, you cheeky scamp?! lol
 
#7
As far as I can gather from my 15 minutes of becoming an expert in the subject, 15.75 KHz is the frequency used by HARD-WIRED cameras, hence why there aren't so many detectors available. Now if you'd said WHAT it was for, I'd probably have had an answer for you by now.

As it is, it's bed-time for me (sod it, a quick search on MSN Search under "video camera detector" gives the first one as having 50m range. If you're going to list your requirements by instalments, you can search the rest yourself).

Night night.
 
#8
By the time the full story comes out, we'll probably find he's trying to find a cheaper version of a speed camera detector. Grrrmph.
 
#9
Or he'll be the lead in a NOTW story about some bloke going around frying the brains of pensioners with some strange home made device then raping their pets.....................
 
#10
Actually, it was looking at that attack on the US convoy in Afghanistan. I just thought , these people invariably video their attack. If you get a vidcam signature in the middle of nowhere , chances are you're about to get zapped or at the very least you're being CTR'd.

Detect the signal, react quicker to the possible threat. Everything electronic/electro-mechanical has some sort of signature.
 
#12
On similar lines (to my way of lateral thinking), as everything has a resonant frequency at which it self-destructs, why has nobody developed a signal generator to destroy RDX, cartridge propellant (and, ultimately swords and half-bricks)?
 
#13
There probably is a way to do it but the problem would be that you would need a dish antenna about 1.5 miles across to be able to pick up the signature. :lol:
 
#14
Sod the signature, it just needs a range greater than the blast area.
 
#15
There was a book written about this subject.
Some sci-fi thing about how a company built a device that could render all forms of explosives inert.

Ended with an all-out war with much blood and death if I remember correctly. :?
 
#16
Back to the original (now-explained) point of the original thread...

Problems include the range of frequencies you'd need to detect - 5kHz-15MHz (after http://www.tscm.com/bugfrqVLF.html ), the possibility that other equipment may generate similar frequencies, and the insurgents' ability to essentially create no-go areas at will just by switching on a video camera.

Followed by accusations of looting as a result of confiscation of video cameras.
 
#17
Its all a matter of signal to noise at the end of the day. How many other devices operate in that band??

Mmm, resonant frequency destruction device... nice idea, but complex objects have many many modes of vibration, and you'd have to account for each of them, and the energies involved would have to overcome the forces holding the object together, which means it would take a lot of energy. In theory, its possible. But unless someone builds an infinite energy device... its unlikely.

TB
 
#18
I see your point puttee , but my point is , how many things giving off an electronic signature in that wavelength , are going to be in the mille of nowhere in the back end of Afghanistan , unless owned by us.

The primary reason for the idea , is to give us an enchanced reaction time. We have as I remember, now got a "RPG signature radar" which pings the moment the missile is out of the tube, and I think I read about an anti-sniper radar under development.

So why not a handheld video camera detector?

Steven , I see what you're saying about the dish etc, but if we can get a general direction , a Yagi type antenna would just as easily do the job, and do it well.
 
#19
Well, a vehicle alternator probably throws out frequencies in the range 50-300 kHz and heaven knows what comes out of a portable radio. Military equipment is easier to assign a signature to because there aren't that many variations and the bandwidth will be tighter.

I'm not knocking the idea, with research I'm sure it could be done, but by then Afghanistan will be history and the newer camcorders may have different frequency signatures.
 

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