northwest Flat Wound Vs Bundle Wound Coils
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australian electronic gold prospecting  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Flat Wound Vs Bundle Wound Coils 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Flat Wound Vs Bundle Wound Coils  (Read 377 times)
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« on: Wednesday April 11 2018 10:56:57 AEST AM »

I have been following a discussion on Finders for some time now and a recent discussion got me thinking in regards to the flat wound type and the bundle wound type mono coils.

From what is being said between two members of the forum one appears to be saying a smaller diameter flat wound coil mono is capable of matching a larger diameter bundle wound mono whereas the other is saying the opposite that the flat wound coils are equivalent to a smaller bundle wound coils.

Therefore as is my addition with testing and since I have both a round 12" flat wound mono and a round 12" bundle wound mono I would run an air test between both coils with my QED using 5 nuggets, a 0.2 gram , 2 gram, 23 gram, 78 gram and 103 gram.

The result using the exact same settings showed both coils produced the same response and depth on the 3 larger nuggets with the flat wound producing the best response and depth on the 2 smaller nuggets.

Some food for thought I suppose although another air test result with a 3oz wire gold & quartz specimen that a member refers too in another thread on this forum it appears a smaller diameter flat wound mono (19") matched a larger diameter bundle wound (25") using a GPX in FG timing and then the 19" flat wound only fell short by 1" to the 25" bundle wound using Normal timing on the same specimen.

Now whether this result was due to the type of specimen nugget used in the air test and would the result be different if using a solid type 3oz nugget as I used for my test I cannot say. Although the GPX does seem to be more sensitive to the more solid type nuggets than the more porous prickly type nugget.

May have to test my GPX using both 12" type coils when next out on the goldfield as no hope while within city limits compared to the QED.

Also I would say as you increase the size of a nugget the 25" bundle wound coil would then increase more depth wise than the 19" flat wound.


"The more you know, the more you know you don't know."

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« Reply #1 on: Wednesday April 11 2018 16:37:45 AEST PM »

Hi Gary.That was interesting. I posted a method I was going to try on this forum winding a double flat mono using mosaic mesh and am pleased to say made winding with litz a lot eaier .I haven't shielded it yet but I have a stacked momo 5x5 layeres which I will compare with.On a post by IB gold post 431 need for big deep gold detectors Are specs for a 12 inch evo coil at 510 kHz .I would have thought they would have a much higher resonate frequency.
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« Reply #2 on: Thursday April 12 2018 11:25:20 AEST AM »

The discussion and build of the coil in "The need for big deep gold detectors" thread seems to be taking a long time to complete and to be eventually tested out in the field.

Using flat wound winding for both the separate Transmit and Receive coils instead of the normal bundle wound in concentric type coils, then it will be interesting to read of its results when it finally gets to be field tested.

A nuisance and difficulty that I have with the flat wound type coil is trying to pinpoint a target still in the ground compared to the bundle wound type coil, more so when the target is small in size as the sensitivity to that target is close to the inner windings. The bundle wound type coil allows you to tilt the coil more so edgewise for a more accurate pinpoint.

However as the target increases in size it allows you to pinpoint more towards the outside winding of the flat wound mono coil.

Not sure how much harder a flat wound concentric coil will be to pinpoint although I expect one would not be chasing small targets as the name of the thread mentioned above implies.

"The more you know, the more you know you don't know."
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australian electronic gold prospecting  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Flat Wound Vs Bundle Wound Coils « previous next »
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