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kac

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Posts posted by kac

  1. The Tejon gives a noticeable dip in the tone roll especially on bigger iron. If you are iron hunting with the Tejon the 10x12 wide scan dd is a good coil. If your trying to pick out non iron objects out of iron infestation then the 8x9 concentric is the choice. Tejon hits gold and silver with a softer smoother tone than mid conductors. I only have 2 Tesoro machines. The Cibola with a tiny dd coil is killer in parks for picking out pocket change especially copper and silver. It does not have the nuances the Tejon has.

  2. Plate was near the main house in the front, my guess it was parked there at some point. Surprised it wasn't lost as they have a septic system so much of the front was dug up. Owner will be redoing the system soon and we are invited back when they start digging to see if there is anything left in that area. They also have a dirt cellar to detect and a barn with dirt cellar that they are cleaning out and have an opportunity to search that too.

    • Like 4
  3. Really depends on the item and location it was found. I found a few large cents in a school yard. Lady passing by that happened to work at the local museum said I should donate them. Nothing historic about the large cents other than being old and most likely were dumped there when fill was added to the school that was built in the 70's so her suggestion fell on deaf ears.

    Year later I found a nice medallion that was silver plated commemorating the founding of the city. Park is old and most likely a native drop back in the day. Called the same museum and they were not interested at all.

    So if it is super rare and has some significance then maybe try to find a home. Class rings I try to return but regular jewelry not likely especially if there is no inscription on them. Most high value jewelry is usually insured so returning it the owner would be double dipping. Finders keepers.

    I haven't posted much here in a while, just lazy 🙂

    • Like 2
  4. On 2/17/2022 at 7:28 PM, PimentoUK said:

    This idea has been on my mind since I first got my Equinox. But recently I've investigated the calibration of the target-ID scale, and that allowed me to make a more detailed post.

    The current target ID scale has its mid-range '20'/'21' calibrated for a 6 kHz target. This seems reasonable for modes like Park1/Field1 , which place their emphasis on the 7.8 kHz operating frequency. The scaling of the rest of the numbers encompasses a very broad range, from targets way beyond US silver Dollars at the top end, to tiny nuggets at the bottom end. See the attached table detailing the current ID range.
    I always felt the range was too compressed - targets reading above '30' ID are very rare for me, the machine seems more like it has a 30-point ID . But if you're the 'milled silver/copper coin hunter' , it's acceptable.

    However, in the sparkier Park2/Field2 modes, the machine is clearly emphasising the 18.2 kHz operating frequency, great for European farmland hunting, looking for tiny ancient coins and other lower-conductor artefacts. But I think the detector needs the option of a recalibrated ID scale to match these low-conductor hunting modes. Centre-scale should be a target matching the 18.2 kHz, such as a US 5 cent 'nickel' coin ( a 16.6 kHz target ). The low ID range can be stretched a bit to give more resolution, and extended a bit to go 'below 1'. The high-conductor end of the scale can sacrifice a lot, and still ID many real common targets.

    I propose a scale with a US 5 cent coin as ID = '20'. Scaling of individual ID steps is for a frequency ratio of 1 : 1.1067 ,so that 4 ID steps represents a 1 : 1.5 change in target frequency. To see how this fills the ID range, see the attached table.

    I think the user should have the option of 'dual-scaling' the TID readout. If Park1/Field1/4kHz/5kHz/10kHz is selected, keep the existing ID scale. If Park2/Field2/15kHz/20kHz/40kHz/goldfield is selected, the nickel-centred 'Low-conductor' scale is used.
    [I've neglected Beach-modes, as I'm not familiar enough with them to decide]

    This choice of 'Standard ID' or 'Dual-scale ID' could be implemented using the (under-utilised) 'coil disconnected' mode. The machine would then remember how it was configured when subsequently operated normally.

    An additional idea : The '88' TID readout can clearly indicate a value above 40, so it's possible to still ID large milled coins in the 'low-conductor' ID mode. The only real issue relates to the 'notch' , where '40' would notch '40 and above', and the feature allowing you to notch a particular target after you've swept over it would need a re-think.

    EqxTID_LoCond.png

    EqxTID.png

    That is a problem with normalized scaling. Nokta's Kruzer and Amphibio scales are normalized to 14khz which is in the middle of their range. The alternative is to use standard scaling which I had done in the past. The only issue with standard scaling is tone breaks will be different unless re-mapped as well as custom tone breaks and discrimination points. One of the things I liked about high frequency machines and gold scale is the wide range of iron giving lots of room for discriminating the iron trash out. Downside is good targets like silvers are all crunched up with little difference in id range from coppers etc.

    Not sure how a flattened linear scale would work if they mapped the target phases evenly. There might be inaccuracies in TID's in some ranges if single frequency is used but may work out well for SMF.

    • Like 2
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