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Originally Posted by Theseus
On the contrary, there is no such thing as a true signal line. They simply do not exist as tangible entities. If they did, there would be other ways (conventional instrumentation) to sense them, besides with a dowsing wand.
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Hmmm...
This is what the folks at Vernell Electronics provided. Apparently they did not agree that signal lines can only be imagined in the mind of dowsers. They provided "other ways" to sense them. The Magnacast 5000 has a receiver with a signal strength meter and a speaker that makes clicking sounds when the "scan gun" antenna is pointed at the signal line. According to the instruction manual, the clicking becomes faster when pointed at the signal line, then slows down when pointing away from the signal line. If this "scan gun" behaves as Vernell Electronics describes it, then it is a non-dowsing electronic sensor of "signal lines". So we now have another way to find the signal line without using dowsing.
There is a lot more information in the instruction manual for the Magnacast 5000. They describe controls on the transmitter that would suggest there is an amplifier inside the box, or at least an attenuator that could vary the power level. But more important, they describe some tests that give clues to what frequency it operates at. For example, their test requires you hold an AM radio next to the transmitter coil antenna and turn the tuning dial to the lowest setting on the dial, below the lowest frequency broadcast station. Then listen for audible tones changing on the AM radio as you turn the knob for different metals at the transmitter.
It seems likely the Magnacast 5000 sends a carrier around 500 KHz with an AM audio tone that is selected by turning the knob to point at one of the different metals printed on the faceplate. Because the instructions say to hold the AM radio next to the transmitter coil, maybe this close proximity is needed to pick up the modulation from a weak signal. The receiver at the scan gun is tested by watching the signal strength meter, and listening for clicking sounds. But they also talk about conditions when you may hear AM radio broadcasts from the "signal line finder" receiver.
After reading this test, it seems likely this model is not the same as the other Vernell Electonics LRLs. It has a way to adjust the power level, and it uses a receiver that can also receive AM broadcasts under certain conditions. The evidence suggests a carrier around 500 KHz modulated with AM audio tones to select different metals. If I were to speculate, I would think they used the VR-800 signal generator to modulate the amplitude of a power transistor that drives the coil transmitter.
Unlike VLF coils which geologists use to locate metal and other objects under the ground, the Magnacast 5000 does not locate any metal. It is claimed to locate "signal lines" in the air that connect from the buried metal to the coil at the transmitter.
If the claims made by Vernell Electronics are to be believed, the Magnacast 5000 may be suitable equipment to conduct a test to see if a signal line exists or not by listening to the clicking sounds produced by receiver.
Read the Magnacast 5000 manual here:
https://vernellelectronics.safenetse...0-from-PDF.pdf