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Metal Detecting - Understanding the Technology Is Important

Metal Detecting for fun or profit can besearch coils. One coil called the
one of the most exciting and rewarding'transmitter coil' transmits electricity
of hobbies. A metal detector can costrapidly many times per second, first in
very little, as low as $50 or higherone direction around the coil, then in
that $400 for a top of the line model.the other direction. The other coil
This is one hobby where you really docalled the 'Receiver Coil' acts just
get what you pay for, because the morelike the name implies it receives
expensive top of the line detectors usefrequencies or data that come or
the most advanced technology and they'bounce' back from the objects the
have the best features available.transmitter coil detects in the search
Metal Detectors use one of three typesarea. This type of Metal Detector is
of technology:great for it's ability for being able to
BFO (Beat Frequency Oscillation) - Metaldistinguish between different types of
Detectors using BFO technology have twometals.
coils of wire, one large coil is locatedThe first metal detector my wife and I
in the search coil of the detector, thebought together cost about $69.00 it was
other small coil of wire is locatedone of them cheap ones that used the
within the System Control Pack. Each'BFO' technology. This was one of them
coil of wire is connected to anmetal detectors you see in the magazines
oscillator that produces pulses ofthat sell other household items, etc.
current. These pulses of current passYou can buy cheap metal detectors like
through the coils generating radiothese at most Radio Shack stores, and
waves. A receiver housed within thesome K Marts and Wal Marts. The first
System Control Pack receives the radioday we took the metal detector outside
waves and makes a series of tones basedwe started finding some neet things and
upon the frequencies of the radio waves.my wife and I were hooked. We did find
When the detector search coil passesour share of junk items in the yard,
over a coin or other metal item alike aluminum foil, nails and the usual
magnetic field is created around thepull tabs and junk metal. But we also
coin or metal item, this magnetic fieldfound 7 old diecast cars in great
causes interference with the frequencycondition. They were all different and
of the radio waves generated by thewere 'TOOTSIE' diecast vehicles. I
search coil. And changes the tonelooked on eBay and the bunch was worth
produced by the reciever.around $15 or more. We also found a 1961
Metal Detectors using BFO technology aresilver Roosevelt dime in fine condition,
the ones your likely to get when payingin our yard, plus the usual pennies.
under $100 for, that's right, theAfter reading about how the 3 different
cheapies. The BFO technology is thetypes of Metal Detector technologies
easiest and cheapest to make, thus thework and differ from each other, you
prices of the detectors are cheap. Themust decide how or what you will be
only problem is, BFO technology is verymostly using your metal detector for.
limited when compared to PI and BFOWill you be hunting for small objects
detectors, and the ability tolike coins, jewelry and gold nuggets, or
distinguish between junk metals andsearching for a large cache or object.
silver or other coins is very poor.The things you may want to use your
PI (Pulse Induction) - Metal Detectorsdetector for, play one of the most
using PI technology sometimes use aimportant factors besides pricing in
single coil or a series of coils workingdeciding what type of detector to buy.
together as a transmitter and receiver.Most folks want a detector that is great
Short bursts of electrical current areat finding coins, gold nuggets, and
send through a coil of wire, causing ajewelry on the land and in small creeks
magnetic field. When the burst ofand streams, this would be a detector
electrical current ends the magneticusing 'VLF' technology. Almost all of
field reverses polarity. A sharpthe modern detectors have a waterproof
electrical spike is created, then moresearch coil which make searching in
pulses are created, the whole processshallow creeks and streams possible.
repeats and works like a series ofThere is Computer Software that is made
echoes, giving a different report orjust for the hobby of Metal Detecting.
echo depending upon the metal itThe software is called: Metal Detector -
encounters. This type of metal detectorTreasure Hunter Professional, and may be
is not very good for discriminationseen at this website address:
between different types of metals orBy Robert W. Benjamin
coins, but it is good to use where someCopyright © 2005
other types of metal detectors haveYou may publish this article in your
trouble working, such as in salt-water,ezine, newsletter on your web site as
and metals can be detected much deeperlong as it is reprinted in its entirety
with this technology than the others.and without modification except for
VLF (Very Low Frequency) - Metalformatting needs or grammar corrections.
Detectors using this technology have two



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