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#3
12-17-2009, 03:40 PM
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Quote:
Nelsons receiver can be used as VLF detector using strong VLF (better to say ULF) transmiters radio signals. Not realy LRL but ULF Rx detector. Most critical part on schematic is antenna. It can not be simple wire or telescopic antenna (these are just meaningless mineoro or rangertell decoration). Antenna have to be directive (better two or even three antennas, mean two or three input stages too) and focussed to positioning small targets to 0,5m in soil. That the antenna at its resonance frequency corresponding to the transmitter frequency is understood. Preferably directive shielded, but no fully RFI shieded like usual MD coils. If one do not want to wound tausants of windings may to use a ferrite rod. This as a starting point. After transmiter selecting some bandpass filter can be added to schematic.
__________________
Global capital is ruining your life? You have right to self-defence! 
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#4
12-17-2009, 04:10 PM
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hola nelson: ese circuito es para detectar proximidad de tormentas, detecta los distantes rayos, mas o menos hasta 200 kilometros, ( si la atmosfera esta cargada ') su sonidos son como cracks craks, tambien cualquier radio sensible detecta esos cracks, pero hacer un lrl con eso necesitaria otras etapas de filtros y amplificacion, nada facil, ya que se cuelan hasta los roces con la ropa de nylon, o interferencias incluso cracks de fugas' y siguen algunos insidiosos cracks, de todos modos el unico que podria sacar de alli un lrl , con su experiencia, seria alonso o esteban, yo tengo en receso un proyecto igual, y ya estoy pensando en filtros de cores' o toroides, pero lo detuve para hacer otras cosas, y luego todavia faltaria la discriminacion, asi que hechale calculo, un saludo mi amigo
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#5
12-17-2009, 07:21 PM
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Check out this interesting site. Lots of ulf/vlf receivers circuits and loops for natural and man made signals.
http://www.vlf.it/
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#6
12-17-2009, 09:25 PM
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Very well Altra, right things,
read this: http://www.vlf.it/matteobruna/ULF_Induction-Coil.htm this is right way to VLF Rx detector.
__________________
Global capital is ruining your life? You have right to self-defence!
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#7
12-23-2009, 02:02 AM
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Hola detectoman, me gustaria intercambiar info, sobre receptores vlf, mi e mail:
antonio.agraz.s@gmail.com tengo otra info sobre circuitos similares, si tienes algo para aplicacion en tesoros, me gustaria intercambiar.
__________________
treasure hunting is the best hobby
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#8
12-23-2009, 02:12 AM
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Hello Nelson:
yes, may be for this receiver, you need a big ferrite rod, you find in: www.coilws.com www.stormwise.com the low frequency penetrate very good in ground, and if you go to one site with big treasure in ground, you receive a null.
__________________
treasure hunting is the best hobby
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