metal detecting terms help

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metal detector terms

TERM EXPLANATION
All-Metal Mode A metal detector setting that detects all metal objects, no discrimination
AudioThreshold The background audio level produced when no target is being detected – it is best to adjust the audio threshold to the lowest audible level, and recommended the operator use headphones when treasure hunting
AudioTone The pitch or frequency of the sound made by a detector. The   tone on the GTI 2500, 1500 and GTP 1350 detectors can be adjusted on a treble to bass scale.
Cache Larger deposits of treasure that generally consist of money and valuable objects
Classifier A filtering device, typically found at the head of a sluice, which helps prevent rocks and other large debris from falling into a gold pan.
Coin Shooting Hunting for coins regardless of location or era of coins targeted
Composite Digger Trowel made of durable plastic that helps prevent coin damage during recovery. Ideal for soft terrain
Control Box Contains the detector’s main circuitry, controls, speaker, batteries and microprocessor chip
DD Searchcoil A special configuration of the transmit and receive coils to minimize the effects of ground minerals
DSP (Digital Signal A highly advanced computer chip used in Garrett detectors and other sophisticated Processor) electronic equipment
Discrimination The ability of a metal detector to reject a target, such as a pull tab and foil or accept a target such as a coin or jewelry based on its metallic composition
FastTrack (See Garrett’s exclusive technology that analyzes ground mineralization and adjusts to “cancel” Ground Balance) its effects in a matter of seconds
Frequency The number of times per second the energy transmitted from a detector’s coil changes direction (e.g. 7.0 kHz = 7000 times per second) – higher frequencies are typically used to find targets such as gold nuggets, while lower frequencies are best for general purpose hunting.
Gold Pan A bowl-shaped, shallow container that traps gold flakes
Gravity Trap™ A patented gold pan made by Garrett which has 90 degree riffles to trap small gold
Ground Balance An adjustment made to “cancel” or ignore ground mineralization; may be done manually (See GroundTracking) or automatically
Ground Tracking The ability of a metal detector to continuously measure the ground’s mineralization and automatically adjust the detector’s ground balance setting for optimum performance
GTA (Graphic Target Analyzer) Exclusive Garrett technology that visually identifies a target’s conductivity or ID and also shows the discrimination pattern
GTI (Graphic Target Imaging) Exclusive Garrett technology that measures and displays a target’s true size and depth
LCD (Liquid Crystal Display) A graphical display that indicates target information, detector settings, etc…
Multiple Frequency See Pulse Induction and Multiple Frequency article
Microprocessor Computer chip that performs digital functions that make many features such as Target ID and Discrimination possible on today’s Garrett detectors
Mono Searchcoil Refers to searchcoils with one ring where both transmitter and receiver antennae are located
Motion Mode Refers to the setting where coil motion is needed to detect targets
Notch Discrimination Targets above and below these discrimination settings
Pinpoint A mode of operation that allows the operator to detemine the precise location of a target still in the ground
Pulse Induction Used primarily for heavily mineralized environments such as the beach or the gold fields of Australia and is found in many of today’s specialty detectors (See also Multiple Frequency)
PowerMaster Exclusive Garrett feature that increases the detector’s ability to detect deeper and wider – up to 20 percent
Probe A long screwdriver-like device usually made of brass used to penetrate the ground and physically locate a detected target before digging it up
Prospecting Hunting for valuable metals such as gold
Relic Hunting Hunting for targets with historical value, such as old battlefield items or family heirlooms
Salt Elimination A detector’s ability to eliminate the interference of salt mineralization, which adversely affects detection depth and target ID capabilities
ScanTrack A unique Garrett feature that automatically adjusts to the operator’s scan speed to achieve optimum performance
Searchcoil Also referred to as the “coil”, the searchcoil is the flat, typically circular disk swept over the ground to sense the presence of metal
Sensitivity Generally synonymous with Depth, the adjustment that determines how deep or small a target can be detected – the higher the sensitivity, the greater the detection depth
Shaft The adjustable stem that connects the control box and the searchcoil
Single Frequency Offers greater potential depth capabilities, better discrimination and enhanced target ID under most common soil conditions where most treasure hunting occurs (See Multiple Frequency article for more information).
Super Sluice™ Large 15″ gold pan with 1/2″deep riffles. Traps small gold nuggets up to one ounce and larger in size
Surface Elimination A detectors ability to ignore all targets located on or near the ground’s surface, which is useful in heavy trash areas
Surface Mount PC Board Technology The latest trend in constructing electronic circuit boards
Target Any metallic item sensed by a detector
Target ID Cursor A graphical indication of the target’s probable identity (e.g. coin, gold, pull tab) based on its electrical properties
Volume Control The ability to adjust the loudness of the audible response produced by the detection of a target

 

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Garrett Infinium ls land and sea LS Metal Detector’s Key Features pulse induction PI P.I.

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Key Features of Infinium LS land and sea :Audio Threshold, Adjustable: adjust to user’s preference

  • Circuit type: Advanced Pulse Induction technology for automaticcancellation of salt/ground mineralization
  • User-adjustable Discrimination with Quick Iron Check
  • User-adjustable Frequency: adjust to reduce interference
  • Automatic Ground Track with 3 settings:
    • Slow—Use over slowly changing ground mineralization.
    • Lock—Locks ground track setting; use for most ground conditionsand offers maximum depth.
    • Fast—Use over extreme or quickly changing ground mineralization.
  • Volume control: on land headphones (included)
  • Hip Mount Battery Pack: reduces detector weight for long searches
  • Salt Elimination Aid: eliminate interference of salt mineralization at beach
  • Battery Life: Alkaline (included), 10-15 hours. Battery recharger for AC andautomobile included. Rechargeable (included), 7-10 hours.

Search Modes :

  • Motion All Metal with adjustable PI discrimination

Infinium LS Metal Detector

Product No. 1152070

Specifications   :

Multiple Frequency Technology 96 frequencies
Circuit Type Advanced Pulse Induction
Discrimination Full Range (PI)
Search Modes Motion, All Metal Deepseekingwith Adjustable PI discrimination
Detection Frequency 730 pulses per second, adjustable
Submersion Depth 200 feet (65m); (underwaterheadphones required)
Standard Searchcoil 10″x14″ PROformance™ DD
Standard Land Headphones Included; weight 16 oz. (.45 kgs.)
Length (Adjustable) 28″ to 52″ (.71m – 1.32m)
Total Weight 5.5 lbs. (2.5 kgs.) stem-mounted,3.8 lbs. (1.72 kgs.) hip-mounted
Control Housing 31 oz. (.88 kgs.)
Detector Buoyancy Near neutral
Batteries 8 AA (included); rechargeables included
Warranty 2 Year, Limited Parts/Labor

Infinium LS is the best salt water PULSE INDUCTION metal detector

Call for the best price always at 1 800 301 6151

Garrett Metal Detectors

 

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DetectionNet Helps Metal Detectors of All Skill Level in Locating Treasures

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Silicon Valley, CA — (Newsupgrade) — 4/25/2014 — With a growing popularity over the last 40 years, the hobby of metal detecting has captured the imagination of men and women across the country. According to Sean Rabbani, spokesperson for DetectionNet, the technological advances made to metal detectors have made it easier than ever before for newcomers to become caught up in the hobby.

Says Sean, “When it comes to metal detecting, there are four basic types: those looking for minerals such as gold jewelry, artifact and relic searchers who may be scouring for Civil War battle pieces, the beach hunter who is looking for just about anything which may have been lost by vacationers, and the coin shooting individual who patiently goes over areas where crowds have been, looking for spare change. What type of metal detector you buy is largely dependent on the the type of detector you specifically are.”

Sean points out some Fisher metal detectors as well as Garrett metal detectors are made for all-around detecting, for those who are serious about one type of detecting over another, it’s often better to purchase a specialized unit. Sean explains, “The oldest name in metal detecting is Fisher and they make models like the F-75 that are good for all-purpose hunting. It has a large LCD screen and Target Identification Discrimination modes for searching in trashy areas, making it a great model for coin shooters. However, if you want to specialize in hunting for mine balls and belt buckles from the 1860s, the best model you can go with might very well be the Garrett ATX. This model uses a pulse technology to locate tiny gold nuggets, small artifacts and coins in even the most extreme conditions, plus it can be used under water up to 10 feet.”

While most novices to metal detecting are not willing to spend upwards of $2,000 on a metal detector, Sean points out this is one hobby where the equipment can literally pay for itself. “One find of a special coin and the detector pays for itself. However, most metal detecting enthusiasts go into the sport for the potential of making a profit, but it’s the hunt alone which keeps them interested. It’s a hobby great for people of all ages, provides moderate exercise, a chance to get out in the fresh air and a love of history and research. Yes, there are going to be days when the hunter finds nothing but bottle caps and pull tabs, but the potential for more is always there.”

About Detection Net

DetectionNet prides itself on being the best source of information on Metal Detectors. Offering one of the world’s largest selection of metal detectors and accessories, they also provide the lowest possible prices on brand new units, shipping all over the country.

 

Media Relations Contact

Sean Rab

1-800-301-6151

 

 

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DetectionNet Helps Metal Detectors of All Skill Level in Locating Treasures

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Silicon Valley, CA — (Newsupgrade) — 4/24/2014 — With a growing popularity over the last 40 years, the hobby of metal detecting has captured the imagination of men and women across the country. According to Sean Rabbani, spokesperson for DetectionNet, the technological advances made to metal detectors have made it easier than ever before for newcomers to become caught up in the hobby.

Says Sean, “When it comes to metal detecting, there are four basic types: those looking for minerals such as gold jewelry, artifact and relic searchers who may be scouring for Civil War battle pieces, the beach hunter who is looking for just about anything which may have been lost by vacationers, and the coin shooting individual who patiently goes over areas where crowds have been, looking for spare change. What type of metal detector you buy is largely dependent on the the type of detector you specifically are.”

Sean points out some Fisher metal detectors as well as Garrett metal detectors are made for all-around detecting, for those who are serious about one type of detecting over another, it’s often better to purchase a specialized unit. Sean explains, “The oldest name in metal detecting is Fisher and they make models like the F-75 that are good for all-purpose hunting. It has a large LCD screen and Target Identification Discrimination modes for searching in trashy areas, making it a great model for coin shooters. However, if you want to specialize in hunting for mine balls and belt buckles from the 1860s, the best model you can go with might very well be the Garrett ATX. This model uses a pulse technology to locate tiny gold nuggets, small artifacts and coins in even the most extreme conditions, plus it can be used under water up to 10 feet.”

While most novices to metal detecting are not willing to spend upwards of $2,000 on a metal detector, Sean points out this is one hobby where the equipment can literally pay for itself. “One find of a special coin and the detector pays for itself. However, most metal detecting enthusiasts go into the sport for the potential of making a profit, but it’s the hunt alone which keeps them interested. It’s a hobby great for people of all ages, provides moderate exercise, a chance to get out in the fresh air and a love of history and research. Yes, there are going to be days when the hunter finds nothing but bottle caps and pull tabs, but the potential for more is always there.”

About Detection Net

DetectionNet prides itself on being the best source of information on Metal Detectors. Offering one of the world’s largest selection of metal detectors and accessories, they also provide the lowest possible prices on brand new units, shipping all over the country.

 

Media Relations Contact

Sean Rab

1-800-301-6151

 

 

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Capital in the Twenty-First Century By Thomas Piketty (Author)

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What are the grand dynamics that drive the accumulation and distribution of capital? Questions about the long-term evolution of inequality, the concentration of wealth, and the prospects for economic growth lie at the heart of political economy. But satisfactory answers have been hard to find for lack of adequate data and clear guiding theories. In Capital in the Twenty-First Century, Thomas Piketty analyzes a unique collection of data from twenty countries, ranging as far back as the eighteenth century, to uncover key economic and social patterns. His findings will transform debate and set the agenda for the next generation of thought about wealth and inequality.

Piketty shows that modern economic growth and the diffusion of knowledge have allowed us to avoid inequalities on the apocalyptic scale predicted by Karl Marx. But we have not modified the deep structures of capital and inequality as much as we thought in the optimistic decades following World War II. The main driver of inequality–the tendency of returns on capital to exceed the rate of economic growth–today threatens to generate extreme inequalities that stir discontent and undermine democratic values. But economic trends are not acts of God. Political action has curbed dangerous inequalities in the past, Piketty says, and may do so again.

A work of extraordinary ambition, originality, and rigor, Capital in the Twenty-First Century reorients our understanding of economic history and confronts us with sobering lessons for today.

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Some features of garrett ace 150 ace150 metal detector

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ace 150 metal detector features:  Key Features of Ace 150 metal detector

  • Coin Depth Indicator to determine target depth
  • Low Battery Indicator: icon remains on when batteries become weak
  • Headphone Jack: quarter-inch (1/4″) size
  • Interchangeable ACE series searchcoils: are available
  • Large LCD Screen with easy-to-read Target ID Legend
  • Pushbutton Controls: with One-Touch operation
  • 3-piece Travel/Storage: disassembles to 24″
  • Adjustable Arm Cuff
  • Ace 150 metal detector very low price

Search Modes (Discrimination Patterns) 3

  • All Metal (Zero)
  • Jewelry
  • Coins

 

Design features and specifications are subject to change without notice.

Specifications:

Target ID Cursor Segments 5
Iron Discrimination Segments 1
Accept/Reject Discrimination NO
Search Modes 3
Sensitivity/Depth Adjustments 4
Electronic Pinpointing NO
Frequency 6.5 kHz
Audio Tone ID Levels 3
Standard Searchcoil 6.5″ x 9″ PROformance™
Length (Adjustable) 42″ to 51″ (1.06m – 1.29m)
Total Weight 2.7 lbs. (1.2kg)
Batteries 4 AA (included)
Warranty 2 Year, Limited Parts   /Labor

 

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metal detector headphones by detector pro detectorpro best in the market

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Detector Pro Headphones for Metal Detectors:

DetectorPro Headphones Title.jpg (6461 bytes)
The Best Metal Detector Headphones In Years for Coin, Relic, Nugget and Jewelry Metal Detecting!

Designed for detectorists who want an economical alternative to professional line.

NEW! Now Available Treasure EarsTMstereo headphones were designed to accommodate the detectorist who desires a lightweight comfortable headphone with a price point below our professional grade phones.

Technical Specifications:

  • Designed in the U.S.A.
  • Excellent sound quality for metal detecting
  • Separate volume control for each ear
  • Comfortable lightweight design
  • Adjustable headband with Stainless Steel frame
  • Coiled cord for easy extension
  • 1/4″ right-angle plug
  • Built with quality materials
  • Speakers designed for maximum sensitivity
  • Power Output: 100 milli-watts
  • Impedance: 32 Ohms
  • Sensitivity: 105 db
  • Cord Length: 6 ft. (extended)
  • Backed by a 1 Year Warranty
Our NEW Treasure Ears headphones were designed to satisfy the demand for an economical alternative to our professional headphone line. Great performance, features, and quality materials at a great price

Black Widow is engineered for detectorists with challenged hearing and for hunting environments with high ambient noise levels. Black Widow headphones were designed to accommodate the professional detectorist with special hearing requirements and for environments with high ambient noise levels. Large extended muffs are designed to block ambient noise to a higher degree for huntsites in proximity to urban traffic and surf roar. The Black Widow contains a dual mini-toggle switching system like our famous Gray Ghost Ultimate. One switch provides greater compatibility with detector audio systems and the other switch allows signal limitation when extreme volume is not required. Also provided are two independent volume controls for those detectorists with unequal hearing ability in each ear. You still get our “industry first” quality components, design and construction without compromise. Black Widows are “deadly”, but guaranteed not to “Sting” you!CAUTION: The significant volume output of the Black Widow compared to our main line of headphones requires us to warn the consumer of potential eardrum damage if detector signal is not regulated to tolerant levels. Without the limiting circuit engaged, we recommend starting with a minimal headphone volume control setting with detector volume at maximum, then gradually increase headphone volume controls as needed and tolerated.

Technical Specifications:

  • Dual rotary volume control with “stay put” segmented “click” positioning.
  • Selector switch for metal detector compatibility with all single-output metal detectors without adapters.
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty strain relieved coil cable with special 1/4″, 90 degree angle stereo connector.

  • Compact carry and storage foldable design.
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speakers designed for maximum volume, sensitivity, efficiency, durability, and signal quality.
  • Special ultra sound-blocking extended muff design eliminating environmental ambient noise up to 29 decibels.
  • Frequency response: 200 – 3200 Hz… only what your detector uses.
  • Sensitivity: 72 db @ 1 KHz Min.
  • Impedance: 150 ohms nominal.
  • Backed by a limmited lifetime warranty.
Black Widow headphones were created to accommodate the professional detectorist with special hearing requirements and for environments with high ambient noise levels. They have extreme output and noise blocking capacity. Still built with our “industry first” quality components, design and construction without compromise.

The Rattler headphone is designed for the demanding professional electronic prospector and gold nugget hunter. Your safety in the field is crucial and we’re sure you’ll never want to use anything but the Rattler! Have you ever been afraid of not hearing a snake or having someone sneak up behind you because you were wearing sound blocking headphones?

Now you can have the superb Gray Ghost sound and still hear what’s around you. This special headphone lets you hear your detector’s signals through one earcup while your other ear is left uncovered to hear things such as dangerous reptiles and snakes. You still have a volume control and a compatibility switch to enable the headphone to work with various detectors. Our Rattler headphone has been custom designed specifically for the gold nugget hunter. This headphone is engineered rugged, tough, and made to stand up to outdoor use and have the signal power to hear the smallest nuggets!

Technical Specifications:

  • Single rotary volume control with “stay put” segmented “click” positioning.
  • Selector switch for metal detector compatibility with all single-output metal detectors without adapters.
  • Heavy-duty coil cable available with special 1/4″, 90 degree angle stereo connector.

  • Compact carry and storage foldable design.
  • Heavy-duty polymer muff with full-ear surround, soft comfortable cushion.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speaker designed for maximum sensitivity, efficiency, durability, and signal quality.
  • Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels in one ear only.
  • Frequency response: 200 – 3200 Hz… only what your detector uses.
  • Sensitivity: 72 dB @ 1kHz min.
  • Impedance:150 ohms nominal.
  •  Backed by a limited lifetime warranty.
Rattler headphone is designed to allow hearing outside noises in one ear thus warning you to dangerous reptiles, snakes and even someone sneaking up behind you. In your other ear, you will get the performance of  famous Gray Ghost line of headphones. Built to satisfy the needs of demanding professional electronic prospectors and gold nugget hunters who frequent areas of dangerous reptiles. We feel your safety in the field is crucial and we’re sure you’ll never want to use anything but the Rattler!

Gray Ghost Logo.jpg (9397 bytes)

Special DMC version designed for use with NautilusTM DMC and Minelab CTX detectors or any two-channel audio equipment that presents different signals to each ear. Relic & Coin Hunters… Give yourself the superb  Gray Ghost sound made especially for your Nautilus DMC detectors. Each channel has its own separate limiter and separate volume control. Made especially for Nautilus DMC and Minelab CTX metal detectors.

Technical Specifications  :

  • Separate volume control for each channel
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty coil cable with special 1/4″, 90 degree angle stereo connector.

  • Compact carry and storage foldable design.
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speakers designed for maximum sensitivity, efficiency, durability, and signal quality.
  • Special built-in signal limiting circuitry on each channel to protect hearing from high volume hits… no batteries!
  • Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels.
  • Frequency response: 200 – 3200 Hz… only what your detector uses.
  • Sensitivity: 72 dB @ 1kHz min.
  • Impedance: 150 ohms nominal.
  • Backed by a limited lifetime warranty.

Gray Ghost Logo (small).jpg (5694 bytes)

Built upon the solid foundation of the Famous Original Gray Ghost, NDT Means “No Down Time!

Gray Ghost NDT HeadphonesDoes this sound familiar… A month of research and you’ve just hiked two miles into the forest after pinpointing an old cellar hole on an old map. You can only afford one set of quality headphones. As you setup your detector and power on, you hear nothing! Suddenly you remember the tree branch that caught and yanked your headphone cord really hard. Luckily you packed mini-phones, but they have an 1/8 ” plug and you lost the adaptor! Now you’ll have to settle for using the loudspeaker to hear the deepest old coins, jewelry and relics… That is if your detector has a built-in speaker!If this has happened to you, you already know the value of having a good backup. Our universal GRAY GHOST® NDT headphones are based on the strong features of our already famous Gray Ghost Originals. For the NDT, we have engineered a very rugged detachable cord with a high-quality connector system and we give you TWO complete cords! You can have your choice of cords with two 1/4″ plugs or two 1/8″ plugs… Or you can have one of each size.So next time you plan on a serious day of metal detecting, don’t take chances, bring the GRAY GHOST® NDT.

Technical Specifications:

  • High-quality locking connector system

Gray Ghost High-Quality Locking Connector

  • Dual rotary volume control with “stay put” segmented “click” positioning.
  • Selector switch for metal detector compatibility with all single-output metal detectors without adapters.
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty coil cable with your choice of two 1/4″ or two 1/8″ stereo connectors, or one of each size

Gray Ghost NDT Cable Plug Choices

  • Compact carry and storage foldable design.Gray Ghost NDT Compact Fold and Carry
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speakers designed for maximum sensitivity, efficiency, durability, and signal quality.
  • Special built-in signal limiting circuitry to protect hearing from high volume hits… no batteries!
  • Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels.
  • Frequency response: 200 – 3200 Hz… only what your detector uses.
  • Sensitivity: 72 dB @ 1kHz min.
  • Impedance: 150 ohms nominal.
  • Backed by a limited lifetime warranty.

Gray Ghost Logo (small).jpg (5694 bytes)

The Ultimate Gray Ghost® is our new no-holds-barred category killer headphone.

 Ultimate Gray Ghost Title.jpg (5209 bytes)Ultimate_Gray_Ghost_Phones.jpg (22220 bytes)This is one headphone you have to try for yourself in order to believe. We started with our now famous Original Gray Ghost headphone and added all the custom enhancements our customers have been requesting most. Now you too can have the ultimate sound quality made possible by special speaker elements in a tuned cavity design. This design means greater sensitivity to tiny targets and more raw power at full volume. The Original Gray Ghost’s switch has been removed in favor of more durable push-buttons in shielded locations by main strain relief. Our special limiter circuit gives you a smooth reduction at excess volume levels,  not like our imitators’ noise-inducing clipping effect, and our limiter can be disabled with the touch of a button.   Additional new features are an industrial grade nylon 6/6 strain relief at a new neck-hugging angle. This reduces stress on the cable and helps it fall closer to your body for fewer branch snags in the most rugged terrain. Try one and we are sure you will agree that no one has ever built a metal detector headphone anywhere near this clear and this sensitive with as many features as the Ultimate Gray Ghost.

Technical Specifications:

  • Single rotary volume control with “stay put” segmented “click” positioning
  • Push-button selector switch for metal detector compatibility without adapters.
  • Push-button switch activates limiter.
  • Special low-noise signal limiting circuitry protects your hearing from high volume hits without batteries.
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty coiled cord with a special three conductor 1/4″, 90  degrees angle stereo connector.
  • Industrial grade Nylon 6/6 pigtail strain relief on cord termination.

Compact_Utimate.jpg (6113 bytes)

  • Compact carry and storage foldable design.
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speaker elements are the ultimate in sensitivity, efficiency, durability, and signal quality.
  • Special sound-blocking muff design eliminating environmental ambient noise up to  24 decibels.
  • Backed by a limited lifetime warranty

Gray Ghost Logo (small).jpg (5694 bytes)

The Original Gray Ghost is designed for the demanding professional coin, relic, and jewelry hunter. These phones are built by detector people for detector people.

 Original Gray Ghost Title.jpg (5060 bytes)Original Gray Ghost Phones.jpg (22225 bytes)Now for the first time there is a serious alternative to the many headphones available in the past for metal detecting. Our new Gray Ghost® Headphones have been custom designed specifically for metal detector users Start hearing those “ghost signals” others are missing. Our headphones are engineered rugged, tough, and made to stand up to outdoor use. Gone are the days of wimpy phones that break on the littlest twig… gone are the days when outdoor noise kept you from hearing the deepest targets… gone are the days when headphones wouldn’t stay on your head… gone are the days of discomfort and loss of concentration… gone are the days of frustrating two-knob volume adjustments… and with our special sound limiting circuitry, gone are the days of headaches from too loud hits!

Technical Specifications   :

  • Single rotary volume control with “stay put” segmented “click” positioning
  • Selector switch for metal detector compatibility with all single-output metal detectors without adapters.
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty coil cable with special 1/4″, 90 degree angle stereo connector.

Compact Original.jpg (4955 bytes)

  • Compact carry and storage foldable design.
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speakers designed for maximum sensitivity, efficiency, durability, and signal quality.
  • Special built-in signal limiting circuitry to protect hearing from high volume hits… no batteries!
  • Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels.
  • Frequency response: 200 – 3200 Hz… only what your detector uses.
  • Sensitivity:   72 dB @ 1kHz min.
  • Impedance:  150 ohms nominal.
  • Backed by a limited lifetime warranty

Gray Ghost DMC NEW : Attention Relic & Coin Hunters using Nautilus DMC metal detectors… Now you can have the superb Gray Ghost sound in each channel of  your detector controlled by independent volume controls! Gray Ghost NDT NDT means “No Down Time!” Built on the solid foundation of the Original Gray Ghost, the Gray Ghost NDT comes with two detachable cables, each with a high-quality locking connector and your choice of plug sizes. Hunt with a new feeling of security! Ultimate Gray Ghost The Ultimate Gray Ghost is our second generation premium headphone with the best sound available anywhere. Top treasure hunters in every field have told us the Ultimate Gray Ghost is the new leader of the pack   Original Gray Ghost The Original Gray Ghost was our first deluxe headphone and it is still the most popular for the demanding professional coin, relic, and jewelry hunter. These phones are built by detector people for detector people. Gray Ghost Deep Woods The Gray Ghost Deep Wood s is for  die-hard relic hunters or anyone who pushes into the most hostile treasure hunting environments

Gray Ghost Logo (small).jpg (5694 bytes)

The Gray Ghost Deep Woods takes you into the roughest back country.

 Gray Ghost Deep Woods.jpg (6420 bytes)Gray Ghost Deep Woods Phones.jpg (20806 bytes)The Gray Ghost Deep Woods is designed for the die-hard relic hunter. We’ve improved our Original Gray Ghost to stand up to the most severe abuse. The Deep Woods has no exterior controls, no exposed metal, rainproofing, cable strain reliefs, and nothing to catch on branches. Like the Ultimate, the cable is protected by the best strain relief and improved placement places it along the neck away from branches. Our special limiter circuit gives you a smooth reduction at excess volume levels, not like our imitators’ noise-inducing clipping effect. Our metal detector compatibility and limiter switches are easily accessible on the inside of the cup where they are totally protected.

Technical Specifications :

  • Selector switch for metal detector compatibility without adapters.
  • Selector switch for limiter.
  • Special low-noise signal limiting circuitry protects your hearing from high volume hits without batteries.
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty coiled cord with a special three conductor 1/4″, 90 degree angle stereo connector
  • Industrial grade Nylon 6/6 pigtail strain   relief on cord termination

 Compact Deep Woods.jpg (5657 bytes)

  • Compact carry and storage foldable design.
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speaker elements are the ultimate in sensitivity, efficiency, durability, and signal quality.
  • Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels.
  • Frequency response: 200 – 3200 Hz… only what your detector uses.
  • Sensitivity: 72 dB @ 1kHz min
  • Impedance: 150 ohms nominal.
  • Backed by a  limited lifetime warranty.

Nuggett Busters Logo.jpg (12544 bytes)

Nugget Busters were designed for the demanding professional electronic prospector and gold nugget hunter. If you’re just getting started in gold hunting, we’re sure you’ll never want  to use anything but Nugget Busters Nugget Buster Phones.jpg (23085 bytes)Our new Nugget Busters headphones have been custom designed specifically for the gold nugget hunter. Start hearing the “whisper signals” others are missing.  Our headphones are engineered rugged, tough, and made to stand up to outdoor use. Gone are the days of wimpy phones that break on the littlest twig… gone are the days when outdoor noise kept you from hearing the deepest targets… gone are the days when headphones wouldn’t stay on your head… gone are the days of discomfort and loss of concentration… gone are the days of frustrating two-knob volume adjustments… just wide-open signal power to hear the smallest nuggets!

Technical Specifications  :

  • Single rotary volume control with “stay put” segmented “click” positioning.
  • Selector switch for metal detector compatibility with all singleoutput metal detectors without adapters.
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty coil cable with special 1/4″, 90 degree angle stereo connector.

Compact Nuggett Busters.jpg (5965 bytes)

  • Compact carry and storage foldable design
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speakers designed for maximum sensitivity, efficiency, durability, and signal quality.
  • Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels.
  • Frequency response: 200 – 3200 Hz… only what your detector uses.
  • Sensitivity: 72 dB @ 1kHz min.
  • Impedance: 150 ohms nominal.
  • Backed by a limited lifetime warranty

 

Nugget Busters

Nugget Busters were designed to the specifications of demanding professional electronic prospectors and gold nugget hunters. They are similar to the Original Gray Ghost but without any limiter for wideopen sound. If you’re just getting started in gold hunting, we’re sure you’ll never want to use anything but Nugget Busters

Nugget Busters NDT

Based on the specifications of demanding professional electronic prospectors and gold nugget hunters. They are similar to the Gray Ghost NDT but without any limiter for wide-open sound. Engineered for No DownTime in the field from cord breakage

Built upon the solid foundation of the Famous Original Gray Ghost, NDT Means “No Down Time!” 

 Does this sound familiar… A month of research and you’ve just hiked a mile into the desert after pinpointing an old claim site on an old map. You can only afford to carry one set of quality headphones. As you setup your detector and power on, you hear nothing! Suddenly you remember back at the car when the door caught and yanked your headphone cord really hard. Luckily you packed mini-phones, but they have an 1/8″ plug and you lost the adaptor! Now you’ll have to settle for using the loudspeaker to hear the deepest nuggets, old coins and relics… That is if your detector has a built-in speaker!If this has happened to you, you already know the value of having a good backup. Our universal Nugget Busters NDT headphones are based on the strong features of our already famous Gray Ghost NDT. For the Nugget Busters NDT, we have engineered a very rugged detachable cord with a high-quality connector system and we give you TWO complete cords! You can have your choice of cords with two 1/4″ plugs or two 1/8″ plugs… Or you can have one of each size.So next time you plan on a serious day of metal detecting, don’t take chances, bring the Nugget Busters NDT.Technical Specifications :

  • High-quality locking connector system

  • Dual rotary volume control with “stay put” segmented “click” positioning.
  • Selector switch for metal detector compatibility with all single-output metal detectors without adapters.
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty coil cable with your choice of two 1/4″ or two 1/8″ stereo connectors, or one of each size

Gray Ghost NDT Cable Plug Choices

  • Compact carry and storage foldable design.
  • Less reflective muff color
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speakers designed for maximum sensitivity, efficiency, durability, and signal quality.
  • No limiting circuitry for loud wide-open signaling.
  • Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels.
  • Frequency response: 200 – 3200 Hz… only what your detector uses.
  •  Sensitivity: 72 dB @ 1kHz min.
  •  Impedance: 150 ohms nominal
  • Backed by a limited lifetime warranty

Jolly Rogers Logo.jpg (9532 bytes)

Our NEW Jolly Rogers Ultimates have added features usually found only on more expensive headphones Built upon the foundation of our popular original Jolly Rogers headphones, we now introduce the Jolly Rogers Ultimates! You get the same rugged construction and quality as the originals, but now with added features like Dual Volume controls and our famous Limiter Switch that reduces the volume of excessively loud signals. Our special limiter circuit gives you a smooth reduction at excess volume levels, not like our imitators’ noise-inducing clipping effect. Our limiter can be disabled with the click of a toggle. You’ll like the way these headphones cover your entire ear comfortably and block out ambient noise allowing you to hear the faintest signals. You’ll like the solid feel of the comfortable headband to earcup adjustment and the fact there are no parts to rust or corrode. You’ll like the feel of the soft earcup cushion material against your head. You’ll like our segmented volume adjustment controls that stay put where you want them to be. You’ll like the way Jolly Rogers fold up to take less space in your equipment bag or case. Last but not least, you’ll love the solid performance of Jolly Rogers Ultimates headphones and the fact that they are protected by a limited lifetime warranty!

Technical Specifications      :

  • Dual-rotary volume control with “stay put” segmented “click” positioning.
  • Limiter Switch for reduction of excessively loud target signals.
  • Selector switch for metal detector compatibility with all single-output metal detectors without adapters
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty coil cable with special 1/4″,90 degree angle stereo connector.

  • Compact carry and storage foldable design
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband…… no screws, no wire frame, no rust
  • Speakers designed for maximum sensitivity, efficiency, durability, and signal quality.
  • Special sound-blocking muff design eliminating environmental ambient noise up to 20 decibels.
  • Frequency response: 150 Hz – 20 kHz… only what your detector uses.
  • Impedance: 16 ohms nominal.
  • Backed by a limited lifetime warranty.

Jolly Rogers Ultimates NEW Jolly Rogers Ultimates have Dual Volume Controls and our famous Limiter Circuit. Everything you love about our original Jolly Rogers, but now with more features usually found only on more expensive headphones Jolly Rogers Jolly Rogers are smaller and lighter but still engineered tough for the beginner and the professional coin, relic, gold nugget, and jewelry hunter.

Jolly Rogers Logo (small).jpg (7496 bytes)

Jolly Rogers are engineered for the beginning and professional coin, relic, gold nugget, and jewelry hunter.

Jolly Rogers Title.jpg (3807 bytes)Jolly Rogers Phones.jpg (24019 bytes)Have a Jolly Good Time finding treasure with our new Jolly Rogers metal detector headphones. By “Jolly Good Time” we mean you’ll find them super comfortable, adjustable, and they just plain stay on your head! In fact, Jolly Rogers headphones have the same rugged construction as our now famous, full-featured professional Gray Ghost headphones. You’ll like the way these headphones cover your entire ear comfortably and block out ambient noise allowing you to hear the faintest signals. You’ll like the solid feel of the comfortable headband to earcup adjustment and the fact there are no parts to rust or corrode. You’ll like the feel of the soft earcup cushion material against your head. You’ll like our segmented volume adjustment control that also stays put where you want it to be. You’ll like the way Jolly Rogers fold up to take less space in your equipment bag or case. Last but not least, you’ll love the solid performance of Jolly Rogers headphones and the fact that they are protected by a limited lifetime warranty!

Technical Specifications:

  • Single rotary volume control with “stay put” segmented “click” positioning.
  • Selector switch for metal detector compatibility with all single-output metal detectors without adapters.
  • Heavy-duty muff-to-muff connection cable.
  • Heavy-duty coil cable with special 1/4″, 90 degree angle stereo connector.

Compact Jolly Rogers.jpg (6109 bytes)

  • Compact carry and storage foldable design.
  • Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions.
  • Adjustable padded headband… no screws, no wire frame, no rust!
  • Speakers designed for maximum sensitivity, efficiency, durability, and signal quality.
  • Special sound-blocking muff design eliminating environmental ambient noise up to 20 decibels.
  • Frequency response: 150 Hz – 20 kHz… only what your detector uses.
  • Impedance: 16 ohms nominal.
  • Backed by a limited lifetime warranty.

Our prices:   Black Widow $135 Free Shipping Nugget Buster NDT $135 Free Shipping Gray Ghost NDT $135 Free Shipping Gray Ghost Ultimate $126 Free Shipping Gray Ghost Original $98 Free Shipping Gray Ghost Deep Woods $98 Free Shipping Rattler $85 Free Shipping Gray Ghost DMC $108 Free Shipping Gray Ghost Underwater $135 Free Shipping Nugget Buster $98 Free Shipping Jolly Rogers $81 Free Shipping Jolly Rogers Ultimates 108 Free Shipping Treasure Ears $45 Free Shipping Back to Metal Detector Page Lowest Metal Detector Sale Prices

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Before buying a metal detector you must read this article learn the best terms

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Air Test:     A test performed by moving various sized metal samples beneath the metal detector searchcoil to check the detector’s features and target response. This test is not an accurate indicator of ground depth penetration capability.

Alkaline: A type of battery able to sustain longer periods of current drain with greater storage life when compared to standard carbon-zinc type

All Metal: Any operating mode or control setting which allows total acceptance of any type of metal targets. It is sually associated with the Ground Balance mode

Audio ID: See Tone ID

Audio Response: See Target Response

Auto Tune: Circuitry which continuously retunes the detector’s threshold to the initial manually tuned audio level. The retuning rate following target rejection or drift can be preset or variable

Back Reading: A false signal, when operating in the discriminate mode, caused by a rejected target coming within one inch of or contacting the searchcoil bottom

Bench Test: An air test to determine at what approximate discriminate settings various metal samples are rejected or accepted. The test is conducted in a non- metallic area.

Black Sand: One of the most extreme components of nonconductive, negative ground minerals. Also called magnetite (Fe304) or magnetic iron oxide.

Body Mount: A configuration whereby the control housing is separated from the control shaft and fastened to the operator’s body lessening arm fatigue and expanding usability for shallow water hunting. Also known as hip mount.

Cache: Any intentionally buried or secret hoard of valuables.

Carbon-Zinc: The most common standard dry cell battery type.

Coil: See Searchcoil.

Coin Depth Indicator: A visual indicator used in conjunction with calibrated circuitry to indicate depth of buried coins in inches or millimeters.

Concentric: A searchcoil configuration using one or more transmit and one receive windings having unequal diameters aligned on a common center; most recently arranged on the same plane and called coplanar concentric.

Conductive Salts: One of the major mineral types which make up the positive ground matrix. Wet,ocean-salt sand produces a positive rise or metallic type response on an air tuned threshold

Conductivity: The measure of a metal targets ability to allow eddy current generation on its surface.

Control Housing: A metal or plastic box which holds circuit boards, indicators, meter, controls and power supply.

Convertible/Combination: A metal detector configuration allowing versatility in operator handling, i.e.,  hand held to body mount.

Coplanar: Any searchcoil configuration in which transmit & receive windings occupy the same level or plane.

Crystal Controlled Oscillator: A transmit oscillator  employing a crystal to maintain stable output frequency.

Depth Penetration: The greatest measure of  metal detector’s ability to transmit an electromagnetic field into the soil matrix and produce a target signal.

Detection Pattern: The densest or strongest region of the searchcoil’s electromagnetic field where detection occurs. Its shape is balloon and changes in size directly proportional to target surface area.

Detuning: Adjusting the audio threshold into the null or less sensitivity tuning zone. Also a method of narrowing a target signal width manually for precise pinpointing. This is accomplished by retuning to audio threshold over the target response area.

DISC: See Discrimination

Discrimination: Adjustable circuitry which ignores or nulls audio responses from a specific conductivity range allowing positive responses to be heard from metals higher in conductivity above the discriminate control setting. Designed primarily to eliminate audio response from trash metals. See also Motion Discriminator.

Double Blip: A signal characteristic common to elongated ferrous targets such as nails or coins lying close to the surface detected in the All Metal no-motion mode

Double D or 2 D : See WideScan.

Drift: A loss of threshold tuning stability caused by temperature change, battery condition, ground mineral content or detector design

Eddy Currents: Small circulating currents produced on the surface of metal by the transmitted electromagnetic field. These currents then produce a secondary electromagnetic field which is then detected by the search coil receiver windings resulting in inductive imbalance between the windings.

Electromagnetic Field: An invisible force extending from top and bottom of the searchcoil created by the flow of alternating oscillator frequency current around the transmit winding. See also Detection Pattern

Electronic Pinpointing : An automated detuning feature which narrows signal response for the purpose of target pinpointing

Elliptical Coil: A searchcoil with an  ellipse shape. This coil can be either concentric or widescan type.

Faint Signal: A sound characteristic of targets that are sometimes deeply buried or very small in size.

False Signal: An erroneous signal created by over shoot, ground voids or highly mineralized hot rocks. See also BackReading.

Faraday-Shield: A metal foil wrapping of the searchcoil windings or  metallically painted searchcoil housing interior for the purpose of eliminating electrostatic interference caused by wet vegetation

Ferrous: Descriptive of any iron or iron bearing material.

Ferrous Oxide: An oxidized particle of iron which generally becomes nonconductive and makes up the natural negative ground mineral matrix. Hematite, which is also iron oxide (Fe203 ) will respond as positive or metallic. See also Black Sand

Frequency: The number of complete alternating current cycles produced by the transmit oscillator per second. Measured in cycles per second.  VLF Very Low Frequency = 3 to 30 kHz; LF Low Frequency = 30 to 300 kHz;MF Medium Frequency = 300 to 3000 kHz; HF High Frequency = 3 to 30 MHz

Frequency Shift: A feature which suppresses the audio interference (cross-talk) between two detectors using identical transmit frequencies in close proximity.

Ground Balance:  A state of operation using specialized circuitry to ignore the masking effect that iron ground minerals have over metal targets.

Ground Balance – Factory Preset: A feature which eliminates the manual ground balance control and its adjustment from the operator’s setup procedure. This adjustment is performed internally by the factory to optimize operation over an average range of nonconductive soils.

Ground Balance – Manual Adjusted: A feature requiring a manual control adjustment procedure to neutralize the effects of negative minerals in the search matrix.

Ground Balance – Self Adjusting: A feature which senses change in ground mineral content and continuously readjusts the ground balance while in operation. Sometimes called Ground Tracking or Automatic Ground Balance

Ground Filter: Complex circuitry found in motion-type detectors which separates mineral signal from the metal signal allowing it to be further processed by the discrimination circuitry

Hand Held: A metal detector configuration whereby the operator holds a shaft or handle which supports the searchcoil and control housing. Also called pole mount

Head: See Searchcoil.

Hz or Hertz: Cycles per second. See also Frequency.

Hip Mount: See BodyMount

Hot Rock: A rock which contains a higher concentration of nonconductive ground minerals than the surrounding matrix to which the detector is balanced. A metallic (positive) response will be heard in the motion and non-motion modes and a null or negative drop in threshold is heard in the all-metal, ground balance mode over these rocks

Isolator: A nonmetal stem which attaches the searchcoil to the control shaft eliminating metallic interference in the detection pattern. On some detectors, the entire lower shaft is made of a nonmetal substance

kHz or Kilohertz: 1000 cycles per second. See also Frequency

LCD or Liquid Crystal Display: Used on a metal detector as a graphic visual indicator same as a meter/needle indicator

LED or Light Emitting Diode: A semiconductor which produces an illuminated visual response

Loop: See Search coil

Matrix: Refers to the total volume of ground penetrated by the transmitted electromagnetic field, which may contain varying amounts and combinations of minerals, metals, salts and moisture.

Metal: Metallic substances such as iron, foil, nickel, aluminum, gold, brass, lead, copper, silver, etc.

Metal Detectorist: A person operating a metal detector in the field. This name is preferred by many over Treasure Hunter.

Meter: A detector component that provides visual information to aid in target identification. Meters feature either an LCD or needle indicator which may display intensity of signal, target depth, target identification, type of metal, or battery condition.

Mineral-Free Discriminator: Any metal detector that can reject or ignore trash metals while simultaneously balancing ground mineralization

Mineralized Ground : Any soil that contains conductive or nonconductive components.

Mode: A condition of operation, selected by the operator, for specific desired function(s).

Motion Discriminator: A detector type that requires searchcoil motion to activate its simultaneous ground balance and discriminate functions. See also Mineral-Free Discriminator and VLF/TR.

Narrow Response: A target that produces an audio response so short that pinpointing is almost not needed.

Negative Ground: Soil that contains non-conductive minerals which have a negative or nulling effect on an air-tuned threshold.

Neutral Ground: Soil that has no nonconductive or conductive mineral properties. Lacks mineralization.

Ni-Cad or Nickel-Cadmium: A rechargeable type of battery cell.

Non-Ferrous: Not of iron. Metals of the precious class (i.e., gold, silver, copper, etc.)

No-Motion: Refers to any mode of operation that does not require searchcoil motion to trigger target response. Also called non-motion.

Notch Accept: Operation whereby all target responses are “tuned-out” except those the instrument is adjusted to accept in the notch “window.”

Notch Discrimination : Filtering circuitry which allows a “window” of desirable targets to be accepted within the entire rejection range of unaccepted targets, i.e., rejecting nails, foil and pulltabs while accepting nickels and gold rings of the same conductivity. This circuitry can also be adjusted to reject all metal targets while accepting only a specific conductivity range.

Notch Level: A control used to select the target level or target conductivity which the notch filter will act upon.

Notch Reject: Operation whereby all targets within the notch width at chosen notch level will be “tuned-out.”

Notch Width: A finite discrimination range of target conductivities (“window”) at the chosen notch level.

Null: The zone just below audible threshold in metal detector tuning. This also refers to the momentary drop or quiet response of threshold sound as the searchcoil passes over a discriminated or rejected target.

Overlap: The amount of searchcoil swing advance not greater than the searchcoil’s physical diameter.

Overshoot: A common false signal heard as the searchcoil passes over a rejected target when using a no-motion All Metal mode in conjunction with automatic retuning. Excessive tuning restoration pushes the audio above threshold level creating a positive response at the edges of target detection periphery.

Phase Response: The length of time between eddy current generation sustained on a metal’s surface and the resultant secondary electromagnetic field effect on the searchcoil’s receive winding. Related to target conductivity.

Pinpointing : Finding the exact target location with respect to a searchcoil’s designated center. Accomplished by interpreting the centers of audio response width in perpendicular directions or scans. See also Detuning.

Positive Ground: Soil which contains conductive minerals or moist salts which have a positive or upward effect on an air-tuned threshold.

PI or Pulse Induction : A mode of operation where the transmitter circuit pulses an electrical current into the ground be fore it quickly shuts down. The eddy cur rents dissipate immediately from poor conductors such as wet salt sand and ground minerals. Metals hold eddy cur rents because they are better conductors. When the receiver circuit comes on, it picks up the returning signal from metal; the eddy currents in the ground minerals have already disappeared

 

Quick Response : A short time period between metal sensing and peak audio/ visual indicator indication usually associated with all frequency ranges of TR detectors

Rejection : An indication of target nonacceptance by a null in threshold or broken sound while operating in a discriminate mode.

RF-Two Box: A radio frequency detector having its own transmit and receive windings separate and in an orthogonal configuration. This detector is capable of deep large object detection while naturally ignoring small targets such as nails and individual coins.

Scan: Refers to A) the effective searchcoil detection width or B) searchcoil movement over the ground

Scrubbing: The searchcoil is pressed and held in contact with the ground while searching to maintain even audio threshold. With newer detectors, this technique is used to gain depth

Searchcoil: A circular (or other shaped) plastic housing containing single or multiple transmit and receive windings (wire coils)  in a specific configuration. A searchcoil emits and receives signals from the ground and metal targets. Also called loop , coil or head

Searchcoil Cable : An electrostatically shielded cable of conductors (wires) which convey signals to and from the searchcoil and control housing

Sensitivity : The capacity of a metal detector to perceive changes in conductivity within the detection pattern. Generally, the more sensitivity a detector can smoothly provide, the more depth it will achieve in sensing targets

Signal: An audio response or visual indication alerting the operator that a target has been detected.

Signal Width : The total distance of ground an audio signal is sustained during search- coil travel or scan

Silent Search : Refers to detectors capable of producing a target signal while operating below the threshold audio. Also called silent operation

Scuff Cover: A protective cover for the searchcoil bottom. Also called coil cover or skid plate

Slow Motion : A description of searchcoil speed required to operate the motion discriminate mode.

Stability : The ability of a metal detector to maintain manually adjusted tuning thresh- old under the effects of outside interference. See also Drift

Surface Area : Refers to the area of a target closest to the searchcoil where eddy current generation can take place

Surface Mount:  The art of mounting electronic components on the surface of a printed circuit board rather than using the “through board” method. This allows more technology in a much smaller space and with much higher tolerances

Sweep  motion employed in moving the searchcoil across the ground

Target: Refers to any object that causes an audio or visual response in a detector

Target Masking: When large sizes or high concentrations of trash metals drive the threshold into the null zone suppressing weaker, positive responses from deeper or smaller targets

Target Response: See Signal

Ten-Turn: A control which can be manually rotated ten times to cover the full electrical range of the function. Usually associated with tuning or ground balance function.

Test Garden : A mapped plot of buried targets at various depths to aid in learning characteristic target responses and in comparing metal detector performances under a given ground mineral content Also called test plot or test bed

TH’er,TH’ing : Universal word contractions for treasure hunter and treasure hunting. Also known as   Metal Detectorist

Threshold: Continuous tone that establishes a reference point for tuning the detector to ground balance it. The threshold tone also establishes the minimum sound level for deep targets in the discriminate mode

Tone ID: Circuitry producing different audio tones for each target’s conductivity range, i.e., low tone for nickel, high tone for coins

TR or Transmitter-Receiver:   Term describing method of operation of early detectors. Some manufacturers still produce this type of detector. Electromagnetic field distortion caused by mineralized ground interferes with depth penetration as this type of detector does not ground compensate. It does balance conductive salt water effects so, it is primarily used in salt water and on low mineral salt water beaches or low mineral inland locations

Visual ID: A feature in which a visual indication is produced to help identify the target.

Visual Indicator: A meter, LCD  LED that signals a target’s presence

VLF or Very Low Frequency See Frequency.

VLF/DISC: Term associated with detectors capable of mineral-free operation in both the Discriminate and All Metal modes

VLF/TR  A class of detector that can operate in both the All Metal, Ground Balance mode and the No-Motion Discriminate, Non-Ground Balance mode

Wide Response: A target that produces an audio signal over an area wider than the searchcoil diameter

Wide Scan: A coplanar searchcoil with two “D” shaped transmit and receive windings positioned back to back and overlapping. This searchcoil type is capable of detecting a target across at least its full diameter. Also called Double-D or 2-D

Zero Discrimination: Used to describe detectors    whose discrimination control allows the acceptance of all metals at zero setting

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How Search Coils Work, and what types they are.

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SEARCHCOIL BASICSThe searchcoil is a vital part of your metal detector. It is the flat, typically circular disk, which generates a magnetic field and senses metallic targets in the surrounding environment. It is located at the end of the stem and is connected to the control housing via a cable normally wound around the stem. The size and depth of the magnetic field is determined by the shape and size of the searchcoil. Understanding the purposes behind the various sizes and shapes of searchcoils will empower you with the ability to choose the best searchcoil for each application.

HOW SEARCHCOILS WORK: Search coils generally consist of two internal sets of coiled wires, a Transmit Coil (TX) and a Receive Coil (RX).Mono coils can be different in that one coil acts as both the TX and the RX. When the detector is turned on, the TX coil generates a magnetic field in the surrounding space.

When a metallic object is within this generated magnetic field, it will create a distortion in the magnetic field. The RX coil will sense this distortion and send a signal to the control housing.A searchcoils detection pattern is determined by the combination of the TX’s generated field pattern and the RX’s sensing field pattern.SEARCHCOIL DEPTH The detection depth of a searchcoil, as a rule-of-thumb, will be approximately equal to its diameter, for a coin-sized object. However, as a searchcoil’s size increases and its field pattern becomes larger, the field pattern becomes less concentrated and begins to miss small objects. For a coin-sized object, this effect becomes noticeable when using searchcoils larger than about 15” in diameter. Since the field generated by a large searchcoil is larger, deeper and less concentrated than a small searchcoil, it is the best choice when hunting for targets that are usually large and deeply buried, such as caches or relics.

SIZES & SHAPES

There are a variety of searchcoil sizes and shapes. The correct one to use depends on the environment it will be used in as well as the targets being sought. A change in any one of these variables may require a different searchcoil.Generally, searchcoils are circular or elliptical in shape. An elliptical searchcoil is more maneuverable than a circular searchcoil and its narrow width actually provides greater coverage than a circular coil due to its elongated length. However, a circular searchcoil has slightly more detection depth and sensitivity in non-mineralized soil, so it is still the most commonly used shape. Searchcoils also come in a 2-box configuration, which are used for detecting deeply buried targets.Searchcoils range in diameter from a few inches to several feet. Those less than 6” in diameter are generally considered small, 6-11” in diameter are considered medium and over 11” are considered large. As noted earlier, there is a direct relationship between the size of a magnetic field and the size of a coil. The bigger the coil, the larger the magnetic field. Therefore, larger searchcoils generally detect deeper than smaller searchcoils.

Small SearchcoilsBecause the magnetic field of a small searchcoil is concentrated within a small volume, it is the best choice for hunting in areas with a lot of metal debris. This allows you to maneuver through and around trash to locate good targets, especially when searching in tight places where large searchcoils cannot go. In addition, because of their concentrated detection field, small searchcoils are the best for detecting very small objects. However, a small searchcoil provides less coverage per sweep; more scans will be required to cover a search area.

Medium SearchcoilsFor general-purpose hunting, which typically includes coins and coin-sized targets, a medium sized searchcoil (8 – 9”) is the best choice. Because a medium sized searchcoil provides the best combination of magnetic field concentration, detection depth and capability to detect the greatest range of target sizes within the detection area, it is standard with most detectors. In addition, it’s lightweight and easy to maneuver.

Large SearchcoilsLarge searchcoils generate wider and deeper magnetic fields than small coils and consequently provide greater depth and coverage. This means that scanning a search area requires fewer sweeps with a large searchcoil than with a smaller coil. This larger scan area, however, can become a problem in trashy areas where the searchcoil is metal detecting several targets at once.

CONFIGURATIONS

In addition to searchcoil sizes and shapes, there are also a variety of searchcoil configurations available, with each proving to be the best choice depending on hunting applications and ground conditions. The configuration of a searchcoil refers to the arrangement of the TX and RX coils within the searchcoil shell. There are basically five configurations: Concentric, Mono, Imaging, Double-D and 2-box.
Concentric Searchcoil

ConcentricThe concentric configuration consists of a TX coil and RX coil which are usually circular and arranged as shown at left. The advantage of this configuration is that both the TX and RX coils are wound as large as possible within a given searchcoil diameter. This provides the largest possible detection field and greatest detection depth, making the concentric coil potentially the most sensitive configuration available.In addition, concentric coils also provide the most symmetrical detection field, allowing ease in pinpointing and consistency in target identification. For these reasons, they are the most commonly used searchcoil and will provide the best overall performance in most environments.Unfortunately, this configuration is the most susceptible to interference from ground minerals, which results in substantial loss of performance when used over heavily mineralized ground.

Mono

A mono-coil is available only on Pulse Induction detectors and is a variation of the concentric configuration. The mono-coil can be manufactured with the TX and RX coils located together or as a single coil acting as both TX and RX.The detection and performance characteristics of the mono are essentially the same as the concentric in that it provides the maximum possible sensitivity, but suffers some performance in mineralized ground.

ImagingAn Imaging searchcoil is an enhanced version of the concentric configuration that features an additional RX coil. This extra coil provides the detector with additional target information necessary for true target-depth perception and true target-sizing capabilities.With this additional sizing information, the detector can more fully characterize a target and for the first time distinguish between trash and good targets of the same conductivity (e.g. a quarter vs. a soda can). Only Garrett’s GTI series offers this technology; no other detector in the world has this capability.

DD Searchcoil

Double-D

The Double-D configuration is designed to significantly reduce ground interference and, thereby, recover the performance lost by a concentric coil over mineralized soil. With the Double-D, it is the arrangement of the TX and RX coils that produce a canceling effect of ground signals.This configuration is called DD because both TX and RX coils are in the shape of a “D”. The positive detection field of the DD runs beneath the overlapping center section from front-to-back. The remaining portion of the coil actually produces negative (i.e. canceling) detection fields. It is this canceling field that allows the DD coil to maintain performance over mineralized ground.Because of its small positive detection field, the DD is inherently less sensitive than a concentric searchcoil of the same size, over non-mineralized ground. The Double-D will, however, significantly outperform the concentric coil over mineralized ground. For this reason, it is highly recommended when hunting over mineralized ground commonly found when prospecting and relic hunting.

2-Box In a 2-box configuration, the TX and RX coils are physically several feet apart. This configuration provides a lightweight, manageable means of achieving the performance of a 3′ to 4′ diameter searchcoil. Because of its large size, and consequently large detection field, the 2-box is the best choice for detecting large, deeply buried objects such as relics and caches. Also, because of its large detection field, it ignores objects smaller than about 3″ in diameter. This characteristic is advantageous when hunting in areas heavily littered with small trash objects.There’s also an enhanced version of the 2-box, only available from Garrett. It is the Treasure Hound with pinpointing. This version incorporates an additional pinpointing coil for precise target location.
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