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Steve Herschbach

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  1. The Aqua Manta has finally arrived in the form of the new Fisher Impulse AQ. The Manta has been officially named the Fisher Impulse AQ, a development that happened later in this very thread. It has also been revealed a gold prospecting model is under development. Go to the link above for the latest information and photos. Or quick jump to the Fisher Impulse AQ Specifications & Data & Fisher Impulse AU Specifications & Data pages. The information below remains for historical purposes. The challenge I have for Fisher or anyone else is to make a dry land ground balancing PI that weighs under 4 lbs yet is more powerful than a TDI SL. The alternative is waterproof but under 5 lbs. The price must be under US$2000.00 Waterproof Pulse Induction Metal Detectors Compared The Fisher Aqua Manta (edit 3/2019 now known as Impulse AQ) has been rumored for some time, and confirmed by First Texas as a project nearing completion. Prior threads: January 2015 New Fisher Pulse Induction January 2018 New First Texas PI Under Development June 2018 Aqua Manta Pulse Induction Beach Detector The long story short is this is a project by Alexandre Tartar. The Manta is most likely an offshoot and improvement on the orginal Eric Foster Goldscan circuit. Alexandre has built at least three major prototype devices before the rights were acquired by First Texas. The following photos and information is derived from this thread where the V3 prototype is sold. Here are the basic specs as described in advertisement (the seller is French and translating): "I sell a "prototype" Manta v3 There are only three copies of this detector and it is the best of three .... (See mantametaldetectors website) Pulse induction, works exclusively with mono coils to the beach, possibly for the land, but no ground control Calibrated for low conductors, gold and platinum, among other. Delay 7us of 17 volts more sensitive, deeper and faster than Deepstar Equipped with a coil, Manta, latest generation she has one month, the quietest and most efficient on the market, all brands included. (it will operate on TDI and Deepstar) Connector Type TDI, it accepts all coils (mono) of TDI / GPX Weight: 1.5 kg without battery that is worn at the belt headphone jack and on / off switch on the battery pack (lipo) supplied charger more than six hours of detection at full power. Carbon Rod Anderson + extra cane down braided nylon belt military style All the possible settings and need a good PI SAT speed, TX frequency, noise threshold, delay, volume, sensitivity.... The delay was 7us , lets see gold ends very thin rings, earrings, jewelry hollow that other detectors can not see and of course, the wholesale jewelry it goes deeper Ferrous recognition by a double beep well marked" What I find interesting is this note "Pulse induction, works exclusively with mono coils to the beach, possibly for the land, but no ground control" Yet here is the picture that accompanies the advertisement. Now remember this is from March 2016, almost three years ago. The prototype clearly has labels for ground controls... Alexandre Tartar Manta V3.0 prototype The control markings as seen above: Volume Threshold Sensitivity Sat Speed. Motion. (recovery speed) Tx Frequency (transmit frequency, usually to offset for EMI mitigation) Pulse Delay. GB Type (the shorter the pulse delay, the more sensitive to tiny metal and salt water) Ground Balance (usually a ground balance control, but ad says this is lacking?) Statements by First Texas suggest version 1 of the new machine is aimed at beach use and may not be suitable for land use (gold prospecting). That in turn makes me think work on the ground balance system is lagging and may be key to the future of the machine. Will it be beach only, or have a future for gold prospecting? I have to assume the unit will be competitive when it comes to the horsepower, or why bother? Until now the Eric Foster Deepstar is generally acknowledged as one of the deepest beach PI detector’s ever made. And the ad says “more sensitive, deeper and faster than Deepstar”. That being the case what really has my interest is the weight and compactness being displayed. The following photo collage from the advertisement shows the size of the control box and belt mounted battery: Alexandre Tartar Manta V3.0 prototype Granted the battery is belt mounted, but that is one tiny control box. I have to think that First Texas can slim down the circuit board and use a top notch integrated rechargeable battery and get this machine into a very compact package - hopefully waterproof and with wireless headphone capability built in. Well, that's about all I know about this one. This thread will collect any new information as it is available. This is one of a couple detectors I am watching so fingers crossed for a 2019 release. It is encouraging that Alexandre's original website at http://www.mantametaldetectors.com/ has been taken over by First Texas and is displaying this banner: Fisher Research Labs - New Pulse Induction metal detector COMING SOON!
  2. Version 2011

    111 downloads

    Understanding Your X-Terra by Randy Horton AKA Digger (Minelab) 14.51 MB pdf file, 96 pages Information on how to properly set up your X-TERRA, how to better understand its functionality and how to maximize its performance for specific sites. Minelab X-Terra 305 Data & Reviews Minelab X-Terra 505 Data & Reviews Minelab X-Terra 705 Data & Reviews Minelab Metal Detector Forum
  3. Hi johndoe, I have to pick and choose what gets loaded to my servers. pdf files are huge, and I can't have people loading them up without review so that ability has now been locked down. I appreciate the desire to help but if you have pdfs you want to show people then link to the original source. I have replaced your file uploads with the links to the source material.
  4. Thanks for the offer. I have already uploaded the User Guide and Advanced User Guide for the V3i and that will be it. I know third parties have put together pdf files on a range of items but this is not a matter of just collecting everything found on the internet and uploading it. I have copyright and fair use issues to consider and a lot of this stuff is pushing the limits. I see you uploaded some pdf files as attachments already, so I have blocked that capability. Pdf files are can be huge in size and I have server resources to look after. Anyway, I appreciate you are trying to help but I have more than I can handle right now. Thanks.
  5. There was no adjustment for me going from the 11" coil to the 15" coil. Pinpoints the same, more or less in the middle of the coil. In the UK I was using a shovel to dig targets. They ended up in a small pile of dirt. I found I could use the 15" coil at a 45 degree angle to nose around in the pile and pinpoint off the tip of the coil. This worked so well I stopped using a pinpointer.
  6. Good man, that's persistence! I admit to being a wimp and waiting for warmer weather.
  7. Ah, but frequency matching is not everything. For starters, I suspect the Anfibio has a higher transmit voltage than the X-Terra and that alone could more than offset any performance issues revolving around coil matching. The fact is with Equinox Minelab has as much as admitted this multi coil approach was not the best. My recommendation is never let theory override observed performance in the field. The only way to really know for sure would be a serious set of tests. All we are going by is theory and opinion.
  8. Added... Gold Districts of California The Tertiary Gravels of the Sierra Nevada of California
  9. Version 1911

    139 downloads

    The Tertiary Gravels of the Sierra Nevada of California by Waldemar Lindgren (USGS) 1911 USGS Professional Paper 73, 12.13 MB pdf file, 285 pages A California geology classic. An account of the Tertiary formations of the Sierra Nevada Mountains and the origin and distribution of the gold-bearing (auriferous) gravels. Gold Panning, Sluicing, Dredging, Drywashing Forum
  10. I offered an explanation in the second post on this thread.
  11. Version 1970

    330 downloads

    Gold Districts of California by William B. Clark (State of California) 1970 California Division of Mines and Geology Bulletin 193, 14.55 MB pdf file, 186 pages A relatively up-to-date and comprehensive guide to the gold deposits of California. Gold Panning, Sluicing, Dredging, Drywashing Forum
  12. Version 1961

    126 downloads

    Gold Placers and Placering in Arizona by Eldred D. Wilson (State of Arizona) 1961 Arizona Bureau of Geology and Mineral Technology Bulletin 168, 6.34 MB pdf file, 125 pages A description of the geology, mining history, and production of the major gold mining districts in Arizona. Gold Panning, Sluicing, Dredging, Drywashing Forum
  13. Please link directly to things instead of telling people to go search for them. Videos can be posted here also. This is not a forum where such things are banned. Otherwise I have to take my time to go find them and add the links. Thanks! https://www.youtube.com/channel/UC9kem8woYGfXIlDBTfbF9cw
  14. And here is an Amazon link to the book or one like it. And here is a website I found while looking for the book that has a detailed history of several Alaskan roadhouses. Thanks George, great subject.
  15. I suppose you could email Minelab and ask. Hades (welcome to the forum) is on the right track. There are membranes that allow air to pass but not water. This is probably a pressure equalization vent? I am just guessing. Here is a link to the page for Gore Portable Electronic Vents.
  16. Good info Simon - thanks! I need to do a better job keeping up....
  17. The problem with the NEL option, putting any performance concerns aside, is the lack of size availability. A 12" x 13" coil on the 2.9 lb X-Terra is not going to be a fun swing. The other thing is that the Anfibio Multi and also the Multi Kruzer (almost the same machine in a lighter, less expensive package) have numerous options and features the X-Terra lacks. Like being fully submersible and built in wireless headphones. The X-Terra 705 is a genuine bargain at its new, lower pricing, but look hard at the extra features here as they may be worth the extra dollars to you.
  18. It's a shame the Gold Kruzer is not getting more press. It is one heck of a value proposition at $749 with two coils (a DD and a concentric!), submersible, and included wireless headphone system. The main thing I like about the Gold Kruzer is the sounds are very much like my old Gold Bug 2 - nice solid true threshold based all metal mode on this one. And yet you have full target id and discrimination options for general purpose detecting.
  19. Here is a link to a terrific article about beachcombing with the Minelab X-Terra 705. Lots of great technical notes here so print out or copy to your computer before this external link expires. Beachcombing With The Minelab X-Terra 705 by Matt Renshaw
  20. I was doing some Googling and tripped over this October 2006 article by Des Dunne. Des is an extremely knowledgeable detectorist who used to work with Minelab and had a key role to play in several models. Good stuff, print it out or copy to your computer before this external link disappears someday. http://www.minelabowners.com/xterratips.pdf Minelab X-Terra 705 Gold metal detector
  21. You just explained the difference. With the X-Terra you are supposed to change coils to change frequencies since the coils are optimized for each frequency. Forcing one to work at another frequency can be done but you are not getting optimum performance at that point due to the frequency / coil mismatch. Minelab VFLEX notes The Nokta/Makro Anfibio Multi like most similar detectors use coils that are wound to work with a range of frequencies. This usually means one frequency is optimal for the coil. The other frequencies are harmonics that the coil will also work with but perhaps not in the most optimal fashion. The whole theory behind X-Terra was that by using optimised coils a performance edge was retained. Reality has shown that whatever performance aspect resides in this use of multiple optimised coils is not as desirable to people as the ability to use one coil but at different frequencies. Selectable Frequency and Multiple Frequency Explained
  22. Welcome to the forum. I don't know what the sticker is made of. No there is not a lot of controversy about this. No doubt there are some who are trying to make it controversial. The Equinox has been out for over a year now and many of them have spent a lot of that time underwater. If leaking was a major issue you would have heard a lot more about genuine leaks by now. Imagining places where something may leak in the future is just imagining things. I suggest if you want your Equinox not to leak, don't take it apart unless it is absolutely necessary.
  23. I have added the following Tesoro resources all found at the Tesoro Electronics Downloads area.... Tesoro 2007 Metal Detector Catalog - some info on discontinued models like the Golden uMax. Tesoro 2013 Metal Detector Catalog - the last Tesoro full line catalog I am aware of. Tesoro Metal Detector Information #22 (2010) - model information and reviews but also packed with generic information on interest to all metal detector users. Tesoro Lobo SuperTRAQ User Guide
  24. Thanks for the extra details Doc - I fixed my incorrect note on the arm cup covers. Anyone near Las Vegas should contact Doc for their Minelab detecting needs - could not ask to meet a nicer more helpful person!!
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