Quote:
Originally Posted by Geo
Hi Nelson.
I believe that the LRL construction is not so simple!!!!!
See Mineoro, rangertell, OKm etc.
There is a well keeping secret 
Regards |
Geo, the only well keeping secret is, that mineoro, rangertell etc. devices are not working. There is no other secret in their boxes.
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.