Steve Herschbach

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Steve Herschbach last won the day on May 22

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About Steve Herschbach

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    Detector Prospector

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  • Location:
    Reno, NV
  • Interests:
    Prospecting, metal detecting, building websites
  • Gear Used:
    Fisher Gold Bug 2; Minelab GPZ 7000, CTX 3030; Whites DFX/BigFoot; Makro Gold Racer; Garrett ATX; Nokta Impact; Teknetics G2; XP Deus; Minelab GM1000

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  1. I would be the first person in the world to say that a good $500 - $700 VLF is all anyone really actually needs. I will never look down on anyone making that choice. I personally don't go that route however. I can tell myself all day long that the F70 is a far more sensible better but for the buck, but in the end I want the F75 with bells and whistles. We all have different perceptions of what represents a best value. I am of the opinion that picking good locations, knowing whatever machine you have well, and putting in the hours is what really matters. Ultimately though my time is more valuable than anything else so spending a little more to have those top end units works for me.
  2. Well I have posted on this forum quite a bit about the F70 with notes as to how it relates to the F75 and will let those past posts speak for themselves. As far as the TNet thread goes my sole purpose in posting the link to it was to illustrate how messed up the whole issue of past versions can get. And therefore my advice when buying a used F75 and less so but also the T2.
  3. Yeah I get to my page also just fine. Go to Your Page Fred and click on the article links. What happens?
  4. To the best of my knowledge all solid black F75 models are the Special Edition (but usually referred to as Limited Edition) model. I am not as well up on the T2 versions. Of note concern would be what software version are you dealing with? There is a can of worms! I think we are at version 9.0/9.1 as of now. We also have a monkey wrench in the form of upgrades done on standard models that can really confuse things. I have to say that I am not shy of buying used detectors and do it a lot. Some models though there are just too many weird changes. And do keep in mind that the First Texas warranty is not transferable. If it was me I would probably get a deal someplace on a new full warranty unit as there were just too many versions and frankly, issues, in the past history of the F75 in particular. T2 not so much but still... be careful. When I get time I am going to research and do a detailed chronology on this subject if somebody else has not already. If anybody finds a link to such a thing please post it. Here is one to show how complicated the issue has become. Fisher F75 vs Teknetics T2
  5. It goes to the very heart of what "induction balance" is all about. The V3i and its related documentation is a virtual class on induction balance technology and how it works. From Spectra V3i Advanced Users Guide by Carl Moreland, page 3-2: "V3i uses induction- balanced loops which rely on a “null” between the transmit coil and the receive coil. The quality of the null may determine the point at which the detector overloads, especially when running Tx Boost along with high Rx Gain settings. Null quality varies loop-to-loop, so some loops may overload at lower gain than others." And from Coil Basics by Carl Moreland, page 2: "a second coil can be placed such that it inductively couples with the transmit coil. By careful placement, we can also get the second coil in a “null” of the transmit field, such that there is no coupling. In such a case we say the coils are inductively balanced, and this is where the term “induction balance” (IB) comes from." The V3i pushes coil design hard by running separately at three different frequencies at high TX output. Each frequency must be separately nulled for optimum performance. There are ways to fudge which makes coils appear to work fine but which result in degraded performance. I can slap a 13 kHz F75 coil on my 19 kHz G2 and have it appear to work fine, but the fact is there will probably be ground balance and target VDI issues. It is stuff like this that makes a layman like me question how Garrett can be getting optimum performance with AT coils on detectors running at 13.6, 15, and 18 kHz? Just how far can this be stretched? The X-Terra models show how a detector can sense and compensate for different individual coils tuned for different frequencies. In theory this has a better end resultant than than trying to get one coil to run best at three different frequencies. In Garrett's case the coils are all the same, probably wound for 15 kHz but with loose enough tolerances that 13.6 and 18 kHz are within an allowable range of offset, and with possible electronic compensation going on in the circuitry. Just a guess on my part however it is this sort of fine tuning that does make or break those fine performance differences between VLF detectors these days.
  6. There is certainly variation in older detectors and current analog models. Far less with modern surface mount digital models. Coils however are always an issue, especially older ones, and especially DD coils on very high performance models like the V3i. The higher the frequency, the harder to get it right. The V3i coil has to be nulled at three frequencies and it is usually the 22.5 kHz frequency that fails.
  7. From the Minelab Knowledge Base Article at "A ‘dust iron’ toroid suitable for the HF frequency band (e.g.1–30MHz with an initial permeability of between 6 and 10) has been carefully selected. It is recommended to use this specific Minelab accessory, only. Alternate ferrites may significantly degrade ground balance quality." You can get the ferrite ring at the link provided by Hawkeye above. Timely, as I just had a discussion with Minelab about the difficulty in finding misc parts. Since all GPZ detectors have been supplied with this part as a standard item for some time dealers probably get no demand for them.
  8. I assumed you knew this stuff Mark but I always toss in extra info on threads for those who may not know. White's D2 coils had a high failure rate early on. This link has information on how to test the coils. Good coils should be able to run RXG=15 with Tx Boost=On without overloading in an air test. If an overload occurs running the V3i separately in each frequency will reveal at which frequencies the coil is failing at (it could be all three).
  9. Air tests can tell you if you have a bad machine/coil. They can tell you the best you can hope for in very low mineral ground. And as the link I provided clearly shows, air tests can offer some real clues as to what modes or settings might be worth exploring in the field. The biggest thing air tests can't tell you is exactly what you have already mentioned johndoe - how well does the detector eliminate ground effects? I have seen one detector air test better than another detector and then have the results flip to the exact opposite in a ground test. There is almost nothing more important than how well a detector eliminates the ground. The worse the ground is that you work in, the more important this is. So while air tests can teach many things one thing they really can't tell you is how the detector performs in bad ground. In fact, some of the machines that air test the best do the worst in the ground!
  10. The ferrite method is to insure the GPZ gets a proper ferrite sample to work with, which it needs to achieve a good ground balance. Most ground has naturally occurring ferrite and in such ground the naturally occurring ferrite does the job. People who normally work in this type of ground use the ferrite ring and see no real improvement, and that is where the confusion starts about the benefits. However, there is ground that lacks enough ferrite to provide that needed reference point, and this is when using the ferrite ring is critical. You could try and guess when those ferrite free ground situations occur, and just use the ferrite ring then, but the fact is you just don't know. Safe answer - use the ferrite ring.
  11. I am going to update this thread/post with links to any reviews of the Deus HF coils I can find as they appear. Remember, the high frequency (HF) coils only work with V4. Andy Sabisch 9" HF Coil Review Condor - First Impressions 9" HF Coil Condor - Second Outing 9" HF Coil Condor - Third Outing 9" HF Coil Aussie Detectorist Gives 9" HF Coil A Go Paul(CA) Tries The 9" HF Coil In Thick Iron Trash
  12. Condor is doing a great job reviewing the 9" HF Coil. I am starting another thread collecting all the review links. At this point it is very tempting for me to just get the 9" HF round as currently all I have is the 11" and so that would not be a half bad combo. But then I would still want the elliptical! My main worry now is that there is an issue holding it up, and that makes me leery of getting one ASAP anyway. At least the 9" seems to be a stable release. Whatever, it's just detectors and since we all have detectors already, probably too many, it just is not that big a deal. I will continue to wait for the elliptical.
  13. Welcome to the forum! Older GPZ threads are in the GPZ 7000 Archive More recent threads that have not made it to the archive yet (those posted in the last year) can be found using the GPZ 7000 Tag You can get very specific on finding information on specific subjects by using the Advanced Forum Search For instance here is the result GPZ 7000 Ferrite The modes and tuning methods people use are specific to their locations and hunting habits. Two people each using a GPZ 7000 at the same location may have vastly different ideas about what settings are best and how to set the machine up. Truthfully this subject has been discussed in great detail on the forum so do please avail yourself of the resources above. I unfortunately am on another mission right now so will leave it there and for others to chime in.
  14. One thing that really irritates me on the majority of other forums is the censorship when it comes to linking to other forums. As if people are too stupid to figure out that other forums exist, which is insulting. More to the point it severely limits the ability to give people good information wherever it exists, which is my main goal on this forum. With this in mind I do actually request that if forum members see anything anywhere that may be of genuine interest to other forum members then please post about it and link to it. Do not copy from other websites and post here unless you are pretty sure that is ok. When in doubt I post a good excerpt and then reference the complete original, as is customary on the internet with news sites. The only real limitation is please stay on topic. Anyway, if you see a thread on another forum (or anywhere else for that matter) and think it is of exceptionally high quality as far as hard information goes then please let me and everyone else know. Thanks! P.S. Do remember that some forums cannot be seen unless a person is a member. No problem linking to them but you probably should do your best to describe what you are linking to and if it really is good enough for people to have to join to see it.
  15. I am watching my author's page where currently every article link goes to the exact same article by somebody else! I guess when that gets fixed it will be a good sign. They are aware of the issue.