northwest Q factor f1a4
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Q factor f1a4 0 Members and 1 Guest are viewing this topic. « previous next »
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Alex
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« on: Thursday April 14 2016 22:06:41 AEST PM »

Helo being new to this hobby i purchaced a minelab f1a4 mod 2 (Jack Lange). The 8 inch coil is fine but lacks ground coverage so i was looking at larger coils .After reading excellant posts from Stefan and I.B.Gold I've decided to try to make a 11 or 14 inch. I think the f1a4 is basically a sd 2000 .If so does this mean the coil neads a high Q like the sd2000
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Doug
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« Reply #1 on: Saturday April 16 2016 10:59:54 AEST AM »

  
Helo being new to this hobby i purchaced a minelab f1a4 mod 2 (Jack Lange). The 8 inch coil is fine but lacks ground coverage so i was looking at larger coils .After reading excellant posts from Stefan and I.B.Gold I've decided to try to make a 11 or 14 inch. I think the f1a4 is basically a sd 2000 .If so does this mean the coil neads a high Q like the sd2000

I don't know but  "mechanic" on this forum i think would know.
doug smile
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« Reply #2 on: Saturday April 16 2016 13:42:26 AEST PM »

Hi Alex,

I don't know about the Q factor, but I do know they like coils that settle fast. Other than that the specs are the same as the normal range of minelab coils. Just keep the capacitance down as much as possible.
Those new nugget finder coils work extremely well and fit the bill 100% for the f1.

I would recommend using a scope to look at the output of the front end and compare it to the earliest sample and make sure the coil has settled back to ground before the first sample begins.

Cheers Mick
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Alex
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« Reply #3 on: Saturday April 16 2016 15:42:51 AEST PM »

Thanks Mick
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Alex
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« Reply #4 on: Saturday April 16 2016 16:50:16 AEST PM »

Doug what do you think of this lcr for a basic start or have you a better suggestion    
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Doug
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« Reply #5 on: Saturday April 16 2016 18:28:42 AEST PM »

  
Doug what do you think of this lcr for a basic start or have you a better suggestion    

I don't think I am competent enough to give an opinion on this.Hopefully some others may chip in.
doug smile
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« Reply #6 on: Saturday April 16 2016 19:26:59 AEST PM »

HI Alex,

I have one of those or a very similar one and when measuring inductance it is way off.

I would be inclined to get a more commercial unit. Try Jaycar. You will pay more, but you'll only need to spend it once.

Cheers Mick
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Alex
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« Reply #7 on: Saturday April 16 2016 20:55:54 AEST PM »

Thanks again Mick
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WM6
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« Reply #8 on: Saturday April 16 2016 22:11:02 AEST PM »

Hi Alex

Tested a lot of different LCR meters.
Here you can find some test results:

  
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moodz
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« Reply #9 on: Saturday April 16 2016 22:39:20 AEST PM »

  

its all you need ... better than 1% accurate ... mine is anyway.
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moodz
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« Reply #10 on: Saturday April 16 2016 22:44:05 AEST PM »

...and a bettter one with the sourcecode :-)      

  
  

its all you need ... better than 1% accurate ... mine is anyway.
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pedro
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« Reply #11 on: Sunday April 17 2016 08:15:38 AEST AM »

I had a 14x9 NF coil on my F1A4 and as Mick says they work well, very sensitive. Be prepared to dig a lot of hot rocks. I also tried an old 18" Coiltek DD, but found that that was very difficult to ground balance. Bought a 11" ML DD and found that to be quieter than the NF but not as sensitive. Good luck with the coil build.
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Alex
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« Reply #12 on: Sunday April 17 2016 09:14:21 AEST AM »

Thankyou for all help everyone , hase given me lots to hink about
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gef12
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« Reply #13 on: Sunday April 17 2016 09:26:23 AEST AM »

someone didnt pay the Ham fees ....vk6fh - or something else  smile
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Q factor f1a4 « previous next »
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