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Mark Gillespie

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Posts posted by Mark Gillespie

  1. On 4/24/2022 at 11:18 AM, PimentoUK said:

    So, here's my frequency analysis post resurrected, plus an additional Youtube video on the topic:


    A poster on the Geotech1 forum found this Youtube video, showing a 'scope examination of the coil drive voltage:

    https://www.youtube.com/watch?v=E2AYJp2uH2U

    It's not really worth watching, it's dull and nerdy, and in Russian or Ukranian, I just included it so you know I'm not making stuff up ...

    So it's broadly similar to the Equinox / DFX , forcing complex square-edged signals onto the transmit coil.
    I have no idea what Mr. Youtuber is saying, so I just observed what was shown, and interpreted it from an engineers view.
    The modes:
    P1 : General
    P2 : Sensitive
    P3 : Sens FT
    P4 : Fast
    P8 : GoldField
    P12 : Beach; all run at 8.08 kHz & 40.4 kHz, a 1:5 ratio.
    -----
    P5 : Park
    P9 : Relic
    P11 : Beach; all run 8.08 kHz & 24.24 kHz, a 1:3 ratio.
    -----
    P6 : Deep HC
    P10 : Dive; both run 4.76 kHz & 14.3 Khz, a 1:3 ratio ( not unlike the Fisher CZ range, but a different waveform shape )
    -----
    P7 : Mono, does what you'd expect, a single freq square-wave, just like the Equinox.

    It looks like P6 / P10 run a three-level waveform, possibly to reduce power consumption, obviously important for a coil with a small internal battery.

    How they process the freqs is of course the important bit. It's probably safe to say the GoldField mode is going to emphasise the 40 kHz. And the Deep HC will be using the 4.76 kHz as it's dominant one, to target the milled copper/silver coins.

    Another Youtube video on the subject:

    https://www.youtube.com/watch?v=0QgAVNWaDD4 

     

     

     

    Did a Russian to English translation (available on YouTube) and the guy states the wave form frequencies are the same for programs 1 through 4. No difference. He also mentioned the oscillogram of the Equinox and the Deus 2 are very similar.
    Time stamp 1.10 and 3.16.

    He also mentioned the possibility of doing a more detailed video of the programs at a later time.
    Anyway, reading all the translations give a good understanding of what he is saying.

    • Like 1
  2. 11 hours ago, Lodge Scent said:

    F350, I took Tekkna out for a short spin this morning. The first time I used it a couple of weeks ago, I found it "interesting", but wasn't really sold on it.  But your review and today's short hunt convinced me there is more to it then just a catchy name. I didn't find anything special but the fact that I dug 5 or 6 copper items in this worn out location really got my attention. I used Gary's stock program and only made changes to Ground Stabilty (set it to 1), and after a few minutes of detecting I lowered the Iron Volume to 8. It's a chatty program but the iron falsing is not bad. I varied the Reactivity between 2 and 4 depending on the iron but used 2.5 or 3 most of the time. The tones were pretty smooth and usually very easy to to sniff out falsing iron with a quick turn of the coil. A couple of times the tone was a bit choppy but consistant for 360 degrees. Both cases there was iron in the hole with the good target. I also left several mid tones in the ground as my time was short. I had the feeling if I had more time I would have sniffed out a nice keeper.

    Just out of curiosity, I hunted with the Offset at 40 for a while. of course it made every target above the Disc sound like a silver. 😁 But that got me thinking there maybe a use for a 40 Offset in some conditions. I won't be happy until I understand why this program works as well as it does. Gary's explanation of "witchcraft" just doesn't cut it for me. 

    Lodge

     

    Warnik 20240309_193750.jpg

    I will bet that XP makes adjustments to this feature in the next update.

     

  3. On 3/1/2024 at 11:40 AM, Digalicious said:

    I don't own a D2, but I do own and use a Legend that also has a FE/CO meter.

    Anyway, I find that meter to be an excellent tool in identifying iron falsing. By iron falsing, I mean a ferrous target that produces a nonferrous TID and a good nonferrous tone, no matter how the coil is manipulated. When that happens with rusty iron, my FE/CO meter will show nothing on the CO side, and a few bars on the FE side. As such, it's very helpful in identifying true iron falsing. The FE/CO meter on the D2 should do the same thing.

    So, for you D2 owners:

    Do you use the FE/CO meter, and if so, how?



     

    I use it to analyze how bad the ground is at a location.

    By what I've seen the F75 and the D2 mineral analysis are the same.

    Fantastic tool

    • Like 1
  4. On 2/25/2024 at 8:55 PM, CalReg said:

    I have neither seen nor heard of any Tarsacci updates. To be honest, I quit looking for them as they became scarce a few years after they were released. With that said, I decided to hunt a beach recently, and I will tell you, it is still the quietest (single or multi-frequency) detector I have ever used. Black sand does NOTHING to this thing! It is deep too! While I didn't find anything of significance. I found a handful of items that were at least a foot deep! Hunting in all metal gives me the best results, but I'm getting to an age where I just don't want to dig everything, so I switch to discrimination mode. I might lose some depth, but the hunt is more enjoyable...good luck on your search!

    I recently had a guy that was involved with the detector since it was first released tell me the coil was most likely at fault on the unit that was loaned to me.  Mine was basically shut down anywhere close to power lines.  This left the detector unusable at the sites I had high hopes for.  Had to return the detector to the owner. 

  5. 6 hours ago, GB_Amateur said:

    I've taken the liberty of enumerating three things from Mark's initial post that started this thread.  It seems most of the discussion has centered on Observation 1.  Unfortunately (AFAIK) I haven't seen anyone who typically detects in mineralized ground take part in this discussion.  (Where's @Chase Goldman who's detected Culpeper, VA with many detectors?)  I can tell you this (as always the caveat 2-3 bar out of 6 Fe3O4 meter reading on the Fisher F75):  For in ground test targets, the F75 (13 kHz single frequency) goes from non-ferrous to ferrous as depth increases on high conductive coins (and maybe most/all non-ferrous targets).  BUT, in air tests, as the distance to the target increases, the signal stays high tone (non-ferrous), just getting weaker until it finally disappears.  The smoking gun points at signal/noise, with the signal being the target getting weaker with increased distance while the noise is ground mineralization, basically staying constant.  Eventually the ground wins ==> ferrous response.  No ground (air test) ==> no low tone.

    More bothersome to me is Mark's Observation 3 where the Manticore and Equinox didn't even pick up a non-ferrous target in multifrequency when single frequency (which frequency? Mark never said) does respond for both detectors.

    All the signal frequencies chosen could detect the target on the Manticore.  Some better than others but all detected the target.  Switching to Multi-frequency and silence.  All possible settings were tried to change the outcome.

    We're still in the process to gain both understanding and solution to the issues.

    • Like 2
  6. Recently had a very puzzling yet intriguing ground target while just fulling around, listening to the ground.  Before I go on I must state I traded my Equinox 800 in for a new Deus 2 detector, several weeks ago.  I had used the Equinox for over 6 years and it was kind of time to trade up.  Well anyway, I came across a very nice text book audio, repeatable, sweet sounding high tone, very faint, I knew it had to be something good perhaps a dime or penny and deep sounding.  Decided to play around with the different programs on the Deus to see which would give the best audio and most stable ID.  All the programs would get the target with varying audio responses and fairly consistent ID.  Now I must admit I hunt with the coil just lightly scrubbing the ground.  Experimented with the typical settings, sensitivity, reactivity, sweep speed etc.  During all this I inadvertently must have slight raised to coil off the ground and the detector automatically went from a nice high tone to a low iron tone. Continued to sweep over the target, lowering to scrub the ground and the high tone with the ID returned, raised the coil and the iron tone and ID returned.  Experimented for over 15 minuted and never found a setting or program that didn't exhibit the same behavior when raising the coil only slightly.  To end this story the target was an 8" dime and by what I could tell laying perfectly flat.

    Now turn the clock back a couple months, the same type of occurrence happened to both Fred (the only living hunting buddy I presently have) and I.  We were hunting an old plantation comparing signals before digging having a fantastic day and Fred called me over to check a target before he dug.  That day he was using the Manticore and I the Equinox, if he raised the coil only slightly the Manticore would go silent with only an occasional high/low tone but no ID.  I tried the Equinox and basically got the same results.  Puzzling, intriguing.  Well anyway he dug and recovered a horse bridle relic.  
    Now this leads me back to yet another story where I was hunting with the F75 and the 5" coil.  Located a nice repeatable tone and called Fred over with the Manticore and he got nothing, only silence, no audio or ID.  He tried every possible setting with no positive results.  Finally he switched to single frequency mode and the target came alive.  Still not satisfied, he experimented for quite some time yet never found a setting or combination of setting while in the Multi-Frequency mode that would indicate a target that the F75 had found.  Adding to this the Equinox exhibited the same type behavior. 

    Just thought I'd share some of our experiences.

    • Like 2
  7. Went to the same site yesterday and I have an updated on some of the targets mention in the original post.  Fred brought his Manticore and tried the single frequency options on the targets mentioned (I no longer have the Equinox so I couldn't try single frequency options).  The Manticore could acquire a very good audio on any of the single frequency options (better on the lower than high frequencies).  But switching to the multi frequency option and the target was gone.  Spent quite a bit of time experimenting with the different frequencies, and I came to a conclusion there must be different algorithms used between the single and multi frequency options for the target to vanish.

    We both hunted with new, recently acquired Deus II and the results were not only surprising but absolutely amazing.  We found 2 V nickels, numerous pennies which included a 1919 and may relics not detected with either the Equinox or Manticore.  One of the V nickels was a 1897, just amazing from only a 10x10' area.  Fred bought is Deus with the 11 DD coil and my came with the 9" DD coil.  At this site the Deus will be the ticket along with the F75 and the 5" coil for the super trash. 

    • Like 4
    • Thanks 1
  8. Fred and I went to an old plantation today and I can honestly say I've got a bad case of the puzzles.
    Fred hunted with the Manticore as usual and I took both the F75 with the 5" DD coil and the Equinox with the Coiltek 10x5. I started hunting with the F75 and within 30 minutes I had dug not one but two wheat pennies, a 1918 and a 1954. I was using the 5" coil, 3 tones, sens at 88, discrimination at 0. Both of these pennies gave a very good 4 way audio. Really couldn't believe it because both the Equinox and Manticore had hunted tirelessly in this area and I was sure it was hunted out. Well anyway, as a test I decided to bury a clad dime in the same area where one of the pennies was at. Nice area at 8" deep and compacted to dirt good and tried the F75 and no issues as long as the coil was directly over the dime, but.
    Neither the Manticore or Equinox would give a good enough audio to prompt us to dig. The ID on both detectors had been pulled down well over half of what a dime should indicate. Fred was doubting that a dime was there so we dug it up and then reburied it at 6.5" deep and still the F75 had no problem but both other detectors failed miserably. Spent a lot of time after this pondering the occurrence. I know what is going on but also understand the 5" coil is the ticket to successfully recover at this location. The ground at this site comes alive with low volume iron grunts. One more thing I would like to add is that turning up the sensitivity at this site degrades the audio to an extent almost nothing can be found.
    In addition to this the coil needs to be scrubbing the ground. The only other site that exhibits the same type anomalies is one of the old schools where the waste, from coal burning furnaces have been discarded on the school grounds for decades.

    • Like 9
  9. Well I can definitely see where the 6" coil will have the advantage over the 10 x 5 Nox.  Found an area about 40 x 40 at a 1800's site where the target density is tremendous.  There is just to many targets for either the stock or 10 x 5 to handle even at max recovery speed.  Here the 6" will way outshine in performance.  I guess my next trip to this location will be with the F75 and the 5" coil. 

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