Gold Bug 2 - Fisherlab
Gold BugProspector’s Metal DetectorOperating ManualFISHERRESEARCHLABORATORY
CONTENTSAbout Your Gold Bug . pg. 1Setting Up. pg. 4Hipmounting . pg. 6Control Functions . pg. 7Operating Modes . pg. 9Turn On Procedure . pg. 10Ground Reject Procedure . pg. 10Auto-Tune Mode . pg. 11No-Motion Mode . pg. 12Motion Mode . pg. 13Searching . pg. 14Pinpointing . pg. 16Auto-tune and Motion Mode . pg. 16No-Motion Mode . pg. 17Target Recovery . pg. 18Operating Tips . pg. 20False Signals . pg. 21Battery Replacement . pg. 23Maintenance . pg. 24Treasure Hunter’s Code of Ethics . pg. 25Where to Use Your Metal Detector in the U.S. pg. 26Specifications . pg. 27
ABOUT YOUR DETECTORThe Fisher Gold Bug was conceived, designed, engineeredand manufactured for one purpose: to find gold nuggets. Andit's done just that for thousands of week-end and professionalprospectors. So, if you're after gold, you've got the right detector.Here's why.Gold Sensitivity:Just about any metal detector will sound off overa large nugget. The problem is, most nuggets aresmall. The Gold Bug will respond solidly to nuggetsnot much bigger than the head of a pin.Ground Rejection:Not only are most nuggets small, they're in highlymineralized soil. Mineralization so strong that itoverloads the ground reject circuitry of manydetectors and drastically reduces the performanceof others. The Gold Bug will penetrate all but theworst of these soils.Operating Modes:Three completely different all-metal modes: VLFSlow Motion, VLF Auto-Tune and VLF No-Motion.All with manual ground adjust and variablesensitivity for optimum operation in any situation.Elliptical Search Coils:The standard 10-inch elliptical coil covers moreground with each sweep than a normal 8-inch coil.The optional 14-inch elliptical coil covers even moreground and goes a little deeper. And the 5-inchelliptical coil is perfect for extremely "hot" groundand tight spots.Keep in mind that the Gold Bug will respond to all metals, notjust gold. It has no "discrimination" or "target identification"circuitry. We've found that any attempt to electronically tuneout unwanted targets is a good way to lose those very tinynuggets.1
ABOUT YOUR DETECTORThere's no reason why you can't use your Gold Bug for "coinshooting" in parks, relic hunting in ghost towns or on the beach.True, the Gold Bug was designed for prospecting, but if you'rewilling to dig up some junk with the good stuff, you'll probablyfind more and deeper targets than you could with a "trashdiscriminating" type of metal detector. This is especially true inhighly mineralized soil or black sand.Now the rest is up to you. You've got the right detector butyou'll have to decide where to search and then put in a lot oflong, hard hours searching. And of course you're going to haveto learn your Gold Bug. Read this instruction manual carefullyand practice often. Drop us a line if you have any questions,comments or exciting gold nugget stories. In the meantime.Happy Hunting,Fisher Research Laboratory2
ABOUT YOUR DETECTORDetector standPadded arm restFoam gripAnodized aluminumupper stemDrop-in batterycompartmentsCableconnectorSnap button7-foot searchcoil cableLock nutAdjustable, ABS,fiberglass-reinforced,nylon lower stemThresholdcontrolVelcro strapsNylon wing nutWaterproof, ESI-shielded,elliptical search coilFigure 1. Fisher M-Scope Gold Bug3
SETTING UPThe Gold Bug comes to you just about ready to use. There areonly three steps required: sliding the lower stem into the upperstem, connecting the loop coil to the control housing andadjusting the angle of the search coil. Take a look at page 3and familiarize yourself with the parts of the Gold Bug beforeproceeding.1. Unpack your new Gold Bugcarefully. Save the carton andinserts –they may come in handyfor future storage or shipment.2. Take a look inside the locknut onthe upper stem. Note the yellowlocking pad on the left-hand sideand loosen the locknut by rotatingit fully counterclockwise.3. Slip the lower stem into theupper stem, making sure the flatside of the lower stem is alignedwith the compression pad insidethe locknut of the upper stem.Tighten and loosen the fit byturning the locknut.Adjust the stem length and coilangle resting the search coil flat onthe ground and about 6 inches infront of your right foot (left foot forleft-handers).4. Adjust the stem length (usingthe lockout) and the coil angle(using the nylon wing nut) so thatthe search coil rests flat on theground about 6 inches in front of,and slightly to the right of, your rightfoot (to the left of your left foot forleft handers.) Your arm should bestraight and relaxed with your gripheld loosely.4
SETTING UPREMEMBER: THE LONGER THE SHAFT, THE MORE YOUWILL HAVE TO BEND YOUR ELBOW AND THESOONER YOUR ARM WILL GET TIRED. THE GOLD BUGIS BALANCED FOR COMFORTABLE SEARCHING IN ATIGHT SEMICIRCLE AROUND THE FRONT OF THEOPERATOR.5. With the stem length properly adjusted, wrap theloop cable tightly around the upper stem andsecure it with the two Velcro straps. Connect thecable connector to the control housing.CAUTION: MAKE SURE THE CABLE IS NOT PULLEDTIGHT AT THE CONTROL HOUSING AND THAT YOUHAVE ENOUGH SLACK AT THE SEARCH COIL TOADJUST IT TO ANY ANGLE6. With the shaft length and coil angle properlyadjusted, you should be able to move into your"search" position (as shown in the illustration onpage 4) by leaning forward very slightly and raisingyour arm (still straight) until the search coil is about2 inches above the ground and 12 inches in frontof your foot. The search coil should be parallel tothe ground and may have to be slightly readjustedat this point.7. If the arm rest is too wide or narrow, you maybend it slightly inward or outward to meet yourexact requirements.5
HIPMOUNTINGYour Gold Bug is light and extremely well balanced however,if you're going to be swinging it for more than a few hours youmay want to convert it to a "hipmount".The Gold Bug control housingcan be hipmounted to reduceweight on the stem and createnearly effortless hunting. Beltloops are provided on the underside of the control housing.1. Disconnect the cable from the housing or makesure you have at least 8 inches of slack cablebetween the housing and upper stem.2. Grab the control housing and slide it off thehandle by pulling it to ward the arm rest.3. Put your belt through the slots on the undersideof the housing.4. Left handers should wear the housing on theirright hip and right handers on their left hip.NOTE: if you’re working in shallow water, you may wantto strap the control housing on your chest in a heavyplastic bag, and seal it tightly around the cable.6
CONTROL FUNCTIONS1. MODE: This thumb activated switch instantly putsyour Gold Bug into one of three operating modes:Auto-Tune, No-Motion or Motion. The Auto-Tune andMotion modes are recommended for searchingwhereas the No-Motion mode is usually used forpinpointing. For a more detailed discussion, see Thesection titled "OPERATING MODES".2. SENS: Adjusts sensitivity to targets and groundminerals. the higher the setting, the deeper you'lldetect. You'll also detect smaller targets. Howeverthe Gold Bug is so sensitive at the maximum settingthat you'll also pick up more false signals in mineralizedsoil or in areas of electrical interference. In theextreme counterclockwise position this controldoubles as a battery test. A loud tone indicates goodbatteries. A faint tone indicates weak batteries. Notone means that it's time for a change. As a generalrule, you'll be able to use your Gold Bug for about anhour after the battery test goes silent.3. GROUND REJECT: This dual knob control is usedto electronically tune the search coil to ignoreground minerals. The small knob on top is a singleturn coarse adjust with about twenty fixed positions.The large 16-turn, fine tuning knob is on the bottom.This control works in conjunction with all threeoperating modes.7
CONTROL FUNCTIONS4. VOLUME: Turns the power on and controls thesignal response volume. Normally set at 10 unless you'rewearing headphones (strongly recommended) inwhich case the volume should be lowered to acomfortable level when the Gold Bug is respondingto a large or shallow target.5. HEADPHONES: This jack accepts most mono andstereo headphones with 1/4" plugs. When using aheadphone with a "Stereo/Mono" switch, put it inthe "Stereo" position.6. RETUNE: Retunes the Gold Bug in the No-Motionmode to your preset "threshold" tone (SeeTHRESHOLD Control). When searching in the Motionmode it is necessary to push, hold and release theretune button when the unit is first turned on (notrequired if it is in the Auto-Tune mode when turnedon) and only occasionally thereafter if you leave itin the MOTION mode. Switching to the Auto-Tuneposition and back has the same effect as pushingthe RETUNE button. Frequent use of the RETUNEbutton is necessary when operating in the NoMotion Mode (especially at high sensitivity levels).7. THRESHOLD: This shaft on the rear of the controlhousing is purposely small and out of the way soyou won't move it accidentally. It is used to tunethe "Audio-Threshold" point at which a very fainthum is heard in the Auto-Tune and No-Motionmodes. Once it is set, you won't have to reset itvery often unless you change SENSITIVITY orGROUND ADJUST points. The THRESHOLD control hasno effect on the Motion mode which runs silentlywithout a threshold tone.8
OPERATING MODESThe Gold Bug has three operating modes, each with its ownadvantages and disadvantages in any given situation. Howeverwith practice and proper use of the SENSITIVITY and GROUNDADJUST controls, you can use any mode in just about any situation.1. MOTION MODE: In this mode the search coil mustbe moving, at least slightly, to detect a target. Thisis the easiest mode to use under moderate soilconditions. There is no threshold tone to worry aboutso you don't have to use the THRESHOLD control orlisten to a constant hum. It's more sensitive thanthe Auto-Tune and doesn't require retuning like theNo-Motion mode. On the other hand, the Motionmode is more sensitive to electrical interferenceand it's harder to identify false signals and badtargets (hot rocks, ground minerals, trash).2. AUTO-TUNE MODE: Also a motion mode requiringat least slight coil movement. Target response issmoother than in the Motion mode and, withpractice, it's easier to tell the difference betweennuggets and hot rocks and there are fewer falseground signals. Since most nuggets are found amonghot rocks in extremely mineralized soil this will be themode of choice for many nugget hunters.3. NO-MOTION MODE: This is the most difficult modeto use. It is more prone to false signals, requires moreretuning and must be re-ground adjusted more oftenthan the other modes. However, the search coildoes not have to be in motion for target responseso it's the preferred mode in tight spots or situationswhere you just can't keep the coil moving back andforth. Furthermore, the problems of tuning, groundadjust and false signals lessen considerably at lowersensitivity levels or in non-mineralized ground. TheNo-Motion mode is most often used however forprecise pinpointing once a target has been locatedin one of the other modes.97
TURN ON PROCEDURE1. Set your controls as follows:MODE Auto-TuneSENS 7GROUND REJECT 52. Hold the search coil waist high, away from anynearby metal.3. Turn the volume on to 10. A short loud squawk isnormal so if you're wearing headphones, start thevolume at zero and let the audio settle downbefore increasing it to a comfortable level whenthe coil is passed over a large or shallow target.4. With the coil still in the air, rotate the THRESHOLDcontrol until you hear a very faint hum. This is theAudio-Threshold tone you'll need to maintain foroptimum performance in either the AUTO-TUNE orNO-MOTION modes. Once you've set it you won'thave to adjust the THRESHOLD control very often.NOTE: The Audio-Threshold tone may sound a littlescratchy or more like a buzz than a hum. This is anormal consequence of the extreme sensitivity ofthe Gold Bug, particularly at high SENS settings ornear power lines.GROUND REJECT PROCEDUREWhen your Gold Bug is properly "ground adjusted", it will haveonly a minimum response to ground minerals when the searchcoil is raised or lowered. Precise adjustment of the GROUNDREJECT control is critical. The higher the ground mineralization orSensitivity setting, the more critical it is. Each operating moderequires its own ground reject adjustment, however for allpractical purposes you need set it only in the mode you'll besearching in. It will be close enough for a quick check orpinpointing in one of the other modes or at worst, require only aquick fine tuning.10
GROUND REJECT PROCEDUREAUTO-TUNE MODE GROUND REJECTION1. With your controls still set as described in the TURNON procedure, lower the search coil to an inch ortwo above the ground. One of three things willhappen to the threshold tone as the coil is lowered:1) The tone will get louder and then return tonormal as the Auto-Tune circuit takes over. (Whenyou raise the coil, the tone will fade.)2) The tone will fade and then return to normal.(When you raise the coil the tone will get louder.)3) The tone will remain the same.2. If the tone remains the same you're properly tuned.3. If it gets louder, rotate the small center GroundAdjust knob one or two clicks to the left(counterclockwise) and lower the coil to theground again from 6 to 10 inches. If the tone stillincreases, rotate the small knob some more andfine tune with the large outer knob until theThreshold tone remains the same (or changes verylittle) when the search coil is raised or lowered.4. If the tone fades when you lower the coil, tuneas in Step 3 except rotate the small GROUND REJECTknob to the right (clockwise) and fine tune withthe outer knob until raising or lowering the searchcoil has a minimum effect on the threshold tone.11
GROUND REJECT PROCEDURENO-MOTION MODE GROUND REJECTION1. Hold the coil 6 to 10 inches off the ground. Pushand hold the RETUNE button a couple of secondsto reset the threshold tone.2. Lower and raise the coil and tune as in the AUTOTUNE GROUND REJECTION instructions for a minimalchange in the Audio Threshold tone. Note that unlikethe Auto-Tune mode, when the tone changes whenyou lower the coil, it stays changed until you raise itagain or until you are properly tuned.3. If the threshold tone changes when you adjustthe GROUND REJECT control, push and hold theRETUNE button a couple of seconds beforelowering the coil.4. As an alternate procedure try placing the coilon the ground, push, hold and release the RETUNEbutton and lift the coil about 6 inches. If the toneincreases put the coil back on the ground androtate the GROUND REJECT knob to the right (tothe left if it decreases), push and release the RETUNEbutton and lift the coil again. Repeat as necessary.You may find this method easier but you might alsolose some depth in highly mineralized soil.12
GROUND REJECT PROCEDUREMOTION MODE GROUND REJECTION1. Tune as you did in the Auto-Tune mode for aminimum response to the ground. This time howeveryou won't have an Audio Threshold Tone to guideyou. Instead, the Gold Bug will start out silently butrespond with a "beep" as the coil approaches orleaves the ground.2. You'll have to lower the coil faster than you didin either of the other two modes, making theprocedure a little more difficult, particularly inmineralized ground. As an alternate procedure tryadjusting the GROUND REJECT control as yousweep the coil back and forth about 2 inches offthe ground.NOTE: In all modes, with just a little practice, you'll soonlearn to do the coarse adjusting as you quickly lower andraise the coil. And with a little more practice, you'll beable to fine tune with just one hand, using your thumb asyou raise and lower the coil.13
SEARCHING1. We recommend that you start searching in theAuto-Tune mode at a sensitivity level of about 7.2. Recheck your ground adjustment frequently byraising and lowering the search coil. In manynugget bearing areas, ground mineralization canchange drastically in a matter of a few feet.3. Keep the search coil moving at a comfortablerate. Remember that the Gold Bug is a motiondetector and responds only when the search coil(or the target) is moving inthe Auto-Tune or Motionmodes.4. Keep the coil parallel to,and as close to the groundas practical. This is importantfor maximum coverage anddepth.5. Overlap your sweeps atleast one half the length ofthe coil.Figure 5. “Sweeping” the Search Coil.Keept he search coil parallel and asclose to the ground at all times6. Search in a methodicalmanner sweeping in a tightsemicircle. Pay close attentionto where you're going andwhere you've been.7. TAKE YOUR TIME. Also very important. If you walktoo fast you can't overlap your sweeps and you'llmiss a lot of ground. If you sweep too fast, you'lllose sensitivity and miss small, deep nuggets thatwould normally be within range of the Gold Bug.14
SEARCHING8. As you gain confidence you'll probably want toincrease your sensitivity level. That's fine. The GoldBug is extremely sensitive to very tiny bits of gold atmaximum sensitivity. Just a couple notes of caution:1) The higher the sensitivity the more false signalsyou'll have to live with.2) You'll have to reset your GROUND REJECTcontrol when you increase sensitivity and you'llhave to recheck it more often. You may also haveto readjust your THRESHOLD control.Figure 6. Search Pattern15
PINPOINTINGAUTO-TUNE AND MOTION MODE PINPOINTINGPinpointing in either the Motion or Auto-Tune mode is a littletricky since you'll lose the audio target response if you stopmoving the search coil. With practice however, you'll be ableto zero in on most targets quickly and accurately.1. Once a buried target is indicated by the "beep"of the Gold Bug, continue sweeping the searchcoil from side-to-side in a narrower and narrowersearch pattern.2. When you have narrowed the sweep as much asyou can and still hear the target, stop the search coil.3. Now move the coil slowly forward and thenstraight back towards you a couple of times. Stopthe coil over the area where you get the strongestresponse.4. Move the coil slowly side to side one more time,stopping at the loudest target response.5. Your target should be below the "Hot Spot" ofthe search coil which is marked by a bulls-eye.6. Slowly move the coil aside, keeping your eyes onthe spot where the Hot Spot was and quickly markthe target location with your finger or digging tool.7. For very strong signals, you may improve
The Gold Bug comes to you just about ready to use. There are only three steps required: sliding the lower stem into the upper stem, connecting the loop coil to the control housing and adjusting the angle of the search coil. Take a look at page 3 and familiarize yourself with the parts of the Gold Bug before proceeding. 1. Unpack your new Gold .
.56 ohm R56 Green Blue Silver.68 ohm R68 Blue Gray Silver.82 ohm R82 Gray Red Silver 1.0 ohm 1R0 Brown Black Gold 1.1 ohm 1R1 Brown Brown Gold 1.5 ohm 1R5 Brown Green Gold 1.8 ohm 1R8 Gray Gold 2.2 ohm 2R2 Red Red Gold 2.7 ohm 2R7 Red Purple Gold 3.3 ohm 3R3 Orange Orange Gold 3.9 ohm 3R9 Orange White Gold 4.7 ohm 4R7 Yellow Purple Gold 5.6 ohm 5R6 Green Blue Gold 6.8 ohm 6R8 Blue Gray Gold 8 .
Gold 6230 2.1 20 27.5 10.4 Y 125 Gold 6226 2.7 12 19.25 10.4 Y 125 Gold 6152 2.1 22 30 10.4 Y 140 Gold 6140 2.3 18 25 10.4 Y 140 Gold 6130 2.1 16 22 10.4 Y 125 Gold 5220 2.2 18 24.75 10.4 Y 125 Gold 5218R 2.1 20 27.5 10.4 Y 125 Gold 5218 2.3 16 22 10.4 Y 105 Gold 5217 3 8 11 10.4 Y 115 Gold 5215 2.5 10 13.75 10.4 Y 85 Gold 5120 2.2 14 19 10.4 Y .
168 Ariados Bug / Poison Chelicerata Arachnida Aranae Salticidae, jumping spider 213 Shuckle Bug / Rock n/a n/a n/a possibly an endolithic fungi 347 Anorith Rock / Bug n/a Dinocaridida Radiodonta Anomalocaris 348 Armaldo Rock / Bug n/a Dinocaridida Radiodonta Anomalocaris 451 Skorupi Poison / Bug Chelicerata Arachnida Scorpiones generalized .
reports using bug tracking software (such as Bugzilla), and then record which change in the SCM system fixes a specific bug in the change tracking system. The progression of a single bug is as follows. A programmer makes a change to a software system, either to add new functionality, restructure the code, or to repair an existing bug.
Filing a Bug Report - Existing Project File a Bug for an Existing Project - Title for bug! - Summarize - Be Descriptive - Select CSU or Component - Set Severity - Describe Module (file.c), Line of code or function - Attach supporting documents - Set Version ( tag from CMVC ) - Assigned to who? Sam Siewert 8 Be clear on bug .
location and study this manual to learn the skill and art of the rewarding endeavor of gold prospecting. Happy Hunting! Fisher Research Laboratories 33 ABOUT YOUR GoldBug2 (continued) This page . All Metal Auto-Tune (NORMAL) 3 3 2. A Meta Auto-Tune ( BOOST) 3. Iron Dscrmnaton ( DISC) 3 Mi
Gold Content 24 Karat pure gold (a color that cannot be duplicated) 18 Karat or marked 750 75 percent gold 14 Karat or marked 585 58.5 percent gold 12 Karat or market 500 50 percent gold Unless you have coinage or a wafer or bar of gold, the dealer usually cheats a little on gold content. Many jewelry pieces are gold plated;
4 Shaft Capacity in Clay (Alpha Method) Soft-stiff clay Adhesion factors
