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Originally Posted by Götz von Berlichingen
How could a BFO work as LRL ?
BFO MD's are well known for their very short Range.
Is there any serious Hypothesis or Theory about BFO LRL ?
If you want a working LRL, you should at least understand how it works.
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According to LRL enthusiasts, BFO and other VLF coil TX/RX arrangements can detect at long range by utilizing the RF propagation properties of the transmission from the coil. According to reports made by a number of forum members, these coils are not detecting eddy currents, but a strange "phenomenon" that they claim develops in the ground of long-time buried metals.
Nobody seems to understand how it works. We only read theories and reports of long range detection. The explanations of how it works seem to be lacking in credibility and proof. That is to say that if anyone was to build an identical circuit to detect at long range, it would not produce results of long range detection that can be verified by scientific testing. The reports of long range detection working are only stories we hear that seem to fail when others try to reproduce them.
"Is there any serious Hypothesis or Theory about BFO LRL "?
For BFO long range detectors, I have read no forum post to suggest a serious theory of long range detecting.* But if you search through the forum posts you will find many theories that do not seem serious. They are not serious because these theories rely on the existence of unknown physical properties that are not recognized or published by any serious engineer, physicist, or scientist. A search in the forum posts will also show there are no concise instructions to build a complete working circuit that will detect long range consistently with the theories that have been offered.
As an example, one of the non-serious theories that long range BFO detection relies on is the theory that gold which has been buried a long time sends gold ions into the air in a column above the ground where the gold is buried. The theory states these gold ions will remain suspended in this column of air that can reach as high as 7 feet above the gold that is buried. And these suspended gold ions are detectable at long range using a BFO design operating at VLF frequencies. In the case of buried gold, there are LRL designs that are claimed to have sensors that can determine the gold is buried below the gold ions in the air that it is sensing.
If you think there are no gold ions floating in a column in the air, or if you think any gold ions that hypothetically arrived in the air would blow away with a slight wind, this will not convince an LRL enthusiast that the ions are not there. Their reason to believe is because they claim they have found long range detection. It is not because they sampled the air and measured the concentration of gold ions to be higher in the air above the buried gold. To contrast what some LRL enthusiasts claim about hovering gold ions in the air, there are many tests made by scientists and technicians with calibrated equipment that confirms there are no anomalies of metal ions hovering in the air above buried metals. And this is easy for anyone to test and confirm with a drift tube.
The theory of gold ions floating in a column air above buried gold is only one of many non-serious theories offered by LRL enthusiasts. A good thing Funfinder is doing is to look at these theories, and try to build some working circuits that can be easily tested to see if the claims can be confirmed with working circuitry that is understood by anyone with the electronic knowledge to build the circuits. Unfortunately, he has scattered his efforts in many LRL directions, without completing a single design to a point that long range tests are ready. Maybe we will see progress in some of the earlier projects he started, rather than more projects starting and then becoming set aside when even more new ideas come to mind.
There are some long range detectors that really do work. You can find many of these in the Geophysics forum, and a couple of them in this forum. But these working long range detectors are mostly used for geological mapping, not for treasure hunting. I doubt most of them would be useful for finding a buried treasure item unless they were modified to optimize them to find small metal targets.
* The exception for BFO detecting long range is a 2-box detector, which is claimed to locate large metal objects up to 25 feet depending on the soil.
You can buy these from White's, Fisher Garret and a number of other metal detector manufacturers, and they are guaranteed to work.
In this case, the theory of long range detection depends on the coil arrangement and the BFO method to detect eddy currents.
This is long range compared to an average conventional VLF or PI metal detector.
Best wishes,
J_P