northwest F1A4 coil
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: F1A4 coil 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: F1A4 coil  (Read 1133 times)
Alex
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« on: Wednesday December 23 2015 16:33:13 AEDT PM »

hi guys i'm new to this forum  i recently bought a F1A4 metal detector as a starter, i read on one site that the standard coils search pattern is cylindrical pattern different to other monos, how is this done?
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Doug
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« Reply #1 on: Wednesday December 23 2015 19:27:16 AEDT PM »

  
hi guys i'm new to this forum  i recently bought a F1A4 metal detector as a starter, i read on one site that the standard coils search pattern is cylindrical pattern different to other monos, how is this done?
I have not heard this!What site did you read  it on?
doug smile
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Alex
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« Reply #2 on: Wednesday December 23 2015 19:44:26 AEDT PM »

  
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Doug
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« Reply #3 on: Wednesday December 23 2015 20:53:48 AEDT PM »

  
  

As far is i can see the field pattern from the mono will be the same as any other mono's wound in the same way.
doug smile
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Alex
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« Reply #4 on: Wednesday December 23 2015 21:27:48 AEDT PM »

thanks Doug ill try and more info
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authere
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« Reply #5 on: Thursday December 24 2015 10:49:47 AEDT AM »

Hi Alex,

Turn your machine on and turn it upside down with the bottom of the coil facing upwards, now wave a target over the coil and pass at different heights .

Each pass should give you a different width for a conical detection shape and each pass giving the same width will be a cylindrical detection shape

But if you wave a large object say a coke can over the coil you would get a different detection shape in that it becomes an arc from the centre of the coil

So, the target size required for your experiment would need to be around one gram in size or just use a five cent piece

Cheers, Ron
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Alex
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« Reply #6 on: Friday December 25 2015 18:52:35 AEDT PM »

thanks Ron ;ill give that a go and get back 
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greylourie
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« Reply #7 on: Friday December 25 2015 21:24:09 AEDT PM »

Download the pdf here:   

Page 93 has test results that show clearly a plot for the stock coil, like Doug says, similar in detection footprint to other mono coils. Conical, not cylindrical.
Page 114 has a plot for the UXO version (timing/coil combo), which is also conical. Some might try to parlay that particular image into a cylindrical shape but it clearly is not.
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Alex
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« Reply #8 on: Friday December 25 2015 22:53:23 AEDT PM »

thanks for that Greylourie explains it well regards alex
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: F1A4 coil « previous next »
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