Did you know that the LED can be used as a light detector? In fact green LEDs are the best for this, but all LEDs will detect light and produce a voltage e. Wow, The XPI seems like a great detector, sounds like you have it already planned out with PCBs. When will we see a kit/PCB's? Have you built a prototype yet? What target price are you shooting for? Robot Check. Enter the characters you see below. Sorry, we just need to make sure you're not a robot. For best results, please make sure your browser is accepting cookies. Relic Hunter Supply Nautilus Metal Detector Tips. The Nautilus is not your average hobby detector. It allows more precise adjustment of the machinesfeatures and requires some working knowledge by the operator to achieve maximum results. Thelearning curve is a little longer, but the results can be very rewarding. A word of warning... Nautilus is check to make sure you have not bumped this toggle type switch to the ONposition or you will start your next days hunt with dead batteries. The MODE SELECTOR has two positions... NON MOTION DISCRIMINATE... GROUND REJECTDISCRIMINATION. An underwater metal detector is an electronic device that detects the existence of any metallic substance at close range. It is commonly used in the world today in the walk through areas to detect guns, bombs and knives due to. The title of this article can mean different things to different people and thereby add to the mystique surrounding the entire field of metal detecting, for that is what “Electronic Treasure Hunting” is all about. Radio Shack Metal Detector Reviews and Specifications. Here you can find users metal detector reviews and specifications on various models and compare them to other brands which are also reviewed on this site by using the menu. Bounty Hunter Tracker IV Metal Detector Performance Detects coin-size targets up to 8 inches deep; larger targets up to 2 feet. Detects the presence of all metals to include gold, silver, brass, aluminum, iron and steel. Find out more On this website. Electron microscopes; Materials; Nanotechnology; Solids, liquids, and gases; On other sites. The Particle Adventure: One of the best simple websites explaining atoms and the world inside them. From metal detectors to betting slips, our Grim Fandango walkthrough continues with a simple guide to completing the second year of the game. Whether you're a relic hunter or a beachcomber, the Fisher F4 metal detector offers the best combination of performance, power, and features in its class. The F4 offers several ways to identify your target. The vast majority of your detecting will be with this toggle switch in the GROUNDREJECT DISCRIMINATION mode. This brings into play both the ground balanced all metal mode andthe motion discrimination mode. Operating with your earphone switch in the STEREO position, youwill get a low tone all metal sound in one ear and a high tone motion discriminate sound in your otherear and can adjust the volume to each ear. Sort of like detecting in stereo with full sound effects. Ifyou place your earphone switch to the MONO position, you will hear both modes in both ear sets. Hunting in MONO is about the same tone- on- tone system known as MIXED MODE on some othermachines. I prefer using STEREO with the all metal signal coming in the right ear and thediscrimination mode coming in the left ear The low tone sound from the all metal mode in your rightear will allow you to judge a targets SIZE, SHAPE, DEPTH and CONDUCTANCE. The higher pitchedbeep from the motion discriminate mode in your left ear will alert you to the fact that your coil ispassing over a target which you have not discriminated out. Being able to hear and compare signalsfrom both modes at the same time provides you with the information you will use to identify the moredesirable targets. The red RE- TUNE BUTTON is used to re- set your threshold sound as necessary and also to DE- TUNEthe all metal mode when pinpointing. The threshold sound will be a slight low pitched hum in yourright ear coming only from the all metal mode. The discrimination mode is set up as a silent searchmotion mode and will signal only when an accepted target is encountered. To make your original. THRESHOLD adjustment, hold in the RE- TUNE button and turn the threshold adjustment clockwiseuntil you hear a slight hum. This slight hum will be your constant reference point from which you willbe able to determine the all metal audio characteristics of each target encountered. The Nautilus's all metal mode is a threshold based mode. You hear a slight threshold hum in yourright ear at all times and that sound increases to indicate targets as you pass your coil over them. The threshold sound decreases or goes quite to indicate an increase in non- conductive minerals. The all metal mode doesn't cull anything, you will hear a change in threshold sound for everything inthe ground... This is a feature you wont find on most otherdetectors and is one of the reasons the Nautilus is known as a very deep detector. The 6 voltposition of this control approximately equals the transmit power of an average detector. As you turnthe control on up toward the 4. Nautilus. Thisis not a linear control as far as depth is concerned, In other words, position 1. You can experience instability, indicated by a wavering threshold sound,if you try to run this control too high at some sites. As a general rule, don't try to over- power a site,just adjust as high as you can go while maintaining a stable detector. Both modes of the Nautilus have their own SENSITIVITY control. The sensitivity control on the leftside of the control box is for the motion discrimination and the one on the right side is for the allmetal mode. The recommended sensitivity settings is 9 for discrimination and 3 for all metal. Atthese settings, comparing the audio of the two modes will allow you to determine the quality of atarget. At these settings, the discrimination mode is deeper than the all metal mode. Havingseparate sensitivity adjustments makes for a very versatile detector as you learn to make theseadjustments to achieve the results you wont. I don't knowthat this is necessary, it is just something I do as 6. Set the AUTO TUNE switch to the OFF position prior to adjusting search loop balance. You can alsoperform the search loop balance procedure with the auto- tune switch turned ON but I think it is moreaccurate to do this procedure with auto- tune turned OFF. Thetransmit and receive windings of a coil are precisely placed and epoxied into permanent positions. Ifeither coil is moved out of position, a signal will be created that can interfere with proper operation ofthe coil. The contracting and expansion of the coils physical structure due to changes intemperature can cause these minuscule changes in the coils operation. This can be happening to alldetector coils but seems to be a somewhat minor effect that it is ignored in other detector designs. The electronic components in a coils circuits can also change value due to aging over a period oftime. The R and C controls of the SEARCH LOOP BALANCE system allows us to finely tune the searchloops coil to insure more precise operation. Hold the search coil up to about waist level while performing search loop balance. This insures thatyou are balancing the coil only and is not being influenced by targets or ground minerals. If threshold becomes unstable at higher settings, lower the transmit voltageuntil you can maintain a stable sounding threshold. Check AUTO TUNE switch turned OFFIf necessary, reset threshold by holding in the RETUNE push button and adjust threshold . Adjust R and C controls to approximately 1. Turn SLB (SEARCH LOOP BALANCE) switch ONTurn either R or C control to the left or right from their center position until the threshold tonedisappears (if you have trouble getting the threshold sound to disappear, lower transmit power. After the threshold tone nulls out, temporarily depress the RETUNE button to bring back thethreshold sound. Do not re- adjust the threshold, just punching the retune button should bring backyour original adjustment. Repeat the above procedure until the tone no longer disappears but just starts to rise. Stop adjusting at this point. Now if you turn the R (or C) control just a small amount left or right youwill hear a small dip or null in the threshold volume. The objective is to have the smallest and lowestsounding null you can get. Leave the R or C control to this nulled position. You don't have to keep manuallyretuning after each adjustment of the R or C control because the auto- tuning will be automaticallyreturning threshold to where you originally set it. Simply turn the R and C controls either left or rightuntil you reach a point where the threshold temporarily nulls out. Once you have located that nulledspot, adjust back and forth until it sounds like you are in the center of the nulled area. This null pointshould be anywhere between the 9: 0. If the coil adjusts out of thisrange, the coil is going bad and needs repair. Special care should be exercised in setting and maintaining a proper GROUND BALANCE. Groundbalance allows the detector to ignore ground minerals in order to reach greater depths and havemaximum sensitivity to all targets. Ground balance simply tunes out the sound of the groundminerals and allows better sounds from targets. Keep in mind that the ground minerals are stillthere, they have not . They are still there and limiting your detecting depth and,depending on the degree of mineralization and the type of minerals, can cause erratic detectoroperation. At some sites, it may be necessary to lower coil voltage and sensitivity to stabilizedetector operation. The ground balance control of the Nautilus is very precise with an eight turnvernier control and a wide adjustment range calibrated from 0 to 1. Since the Nautilus all metalmode is threshold based and you will be listening to that threshold sound in one ear at all times, youwill immediately be made aware of changing ground minerals and can adjust accordingly. Simplypump the coil up and down from about 1. You can ground balance with the. AUTO TUNE turned ON or OFF. Pump the coil from about 1. If threshold sound increases,you will have to adjust the ground balance control down (counterclockwise). If threshold sounddecreases, you will have to adjust the ground balance control up (clockwise). Raise the coil, make a very slight adjustment up or down as necessary, hit the retune button toreturn threshold to its original setting and lower the coil to the ground to re- check for effect. Continue making small incremental adjustments until the sound of your threshold is the same withthe coil at 1. Retuning will be necessary aftereach ground balance adjustment. You may prefer to ground balance with the auto tune switch turned ON so that retuning the thresholdis not necessary. The purpose of the auto tune circuitry is to maintain the all metal threshold volumeto your original volume setting. Any increase or decrease in threshold sound will automatically betuned out and threshold returned to original volume. This requires you to have the coil in continuousmotion in order to hear targets. It effects only the all metal mode and creates, in effect, a MOTIONALL METAL MODE. To ground balance with auto tune turned ON: Set THRESHOLD to slight hum. Locate a section of ground that is clear of all targets. The threshold volume should be thesame at 1. While continuously pumping the coil at the ground, increase ordecrease the ground balance control setting until proper ground balance is achieved. Manualretuning is not required since auto tuning is taking place but you do have to keep the coil moving upand down fast enough while pumping the coil to overcome the auto tune effect. With the excellent GROUND BALANCE control of the Nautilus, there is no excuse for not maintaininga proper ground balance at all times. As the ground minerals change, a new ground balance will berequired.
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