LYCOS RETRIEVER 
Metal Detector
built 654 days ago
Viking Metal Detectors have been manufacturing in England since the 1970's. Their primary aim has always been to produce quality metal detectors for the hobbyist, though for many years have ... supplied the water authorities. The Regton range of Viking metal detectors include; Viking 1, Viking 5, Viking 6, VK 10, VK 20, VK 30 and VK 40.
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The US Federal Aviation Administration in their Report DOT/FAA/CT-95/49 titled “Screening With Hand-Held Metal Detectors.” * rated the this unit highly. Products produced by the world’s leading manufacturers were evaluated. Twenty-six experienced airport security officers rated fourteen of the most commonly used products. The following factors were included in the testers’ assessment:
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Metal detectors have two oscillators. One is tunable and the other is "Fix" with a loop. Both are "Tuned" at same frequency. Outputs from this two oscillators are then mixed in a mixer which produces only the difference. Means, if both oscillators are at the same frequency, there is nothing heard in the speaker.
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Many metal detectors even allow you to filter out (discriminate) objects above a certain phase-shift level. Usually, you can set the level of phase shift that is filtered, generally by adjusting a knob that increases or decreases the threshold. Another discrimination feature of VLF detectors is called notching. Essentially, a notch is a discrimination filter for a particular segment of phase shift. The detector will not only alert you to objects above this segment, as normal discrimination would, but ... to objects below it.
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Before going to buy your new metal detector sit down with a piece of paper and write down any and all questions you might have. Talk with the dealer ask all of your questions, if you start to feel pressured and are not getting the answers you seek, WALK OUT! Find a different dealer.
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New genres of metal detector have made their appearance. BB (Beat Balance) and CCO (Coil Coupled Operation) were unveiled by the electronics press in 2004. Both were invented by electronics writer and designer Thomas Scarborough and combine unprecedented simplicity with good sensitivity.
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Metal Detector