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Offline xavierTopic starter
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« on: June 09, 2013, 02:00:52 pm »
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Hi Guys

I have been looking at the butterfly coils but other than the coil description and how well it works I can't find any info on how it's made. Is it made in the same way as a DD coil? what are the RX and TX ratios? what would determine the size of the coil?

All the best
Xavier

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So many questions so little time
Offline Homefire
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« Reply #1 on: June 09, 2013, 02:47:59 pm »
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Never used one.    There just like DD but a bit more round and Tuned the same I would think.

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Offline xavierTopic starter
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« Reply #2 on: June 10, 2013, 08:24:57 am »
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Quote:Posted by homefire
There just like DD but a bit more round and Tuned the same I would think.

No there's more to it from what I have read, they say that it performs a bit like a DD but also like a coplanar coil so I think that I will try to make one and see what I can learn from it.

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Offline GoldDigger1950
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« Reply #3 on: June 10, 2013, 08:39:08 am »
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Quote:Posted by xavier
No there's more to it from what I have read, they say that it performs a bit like a DD but also like a coplanar coil so I think that I will try to make one and see what I can learn from it.

They are used in that configuration as directional antennas in HAM radio. Very sensitive for receiving and very precisely directional in transmitting. If you use it as a monocoil for a PI machine, it should be great. Just design it as a flattened figure 8. Wind your coil as usual but 2x the size you want. Take both edges and give the entire thing a half twist making it into a figure 8. Shape it so the pattern is vertical and start a Smith Chart based on empirical measurement. You know the drill by now.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #4 on: June 10, 2013, 12:31:04 pm »
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Hello,

Detech makes butterfly coils for different detectors. (Excelerator, SEF, Ultimate).
So because they are commercial there should be a patent explaining how they work.

I found this link :

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http://www.deeptech-bg.com/search_coils.pdf


I think pages 20 or 21 are what you are looking for.

Regards,

Yarglawai.

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« Reply #5 on: June 10, 2013, 01:02:33 pm »
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Xavier, I test four of these coils and their detection field is not uniform and they are not as sensitive as the Whites coils and they cant match Minelabs either Out of all the coils I tested whites were the best and Coiltek came up better than all after market coils, I have seen 100s of these SEF/butterfly coils in big boxes waiting to go to the dump because of the High failure rate and the reason they were sent to the dump was because Detech did not want them back for repair due to freight costs,

It dont matter who says what, You cant Polish a Turd

RR

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Offline BitburgAggie_7377
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« Reply #6 on: June 10, 2013, 01:16:17 pm »
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Quote:Posted by Ridge Runner
It dont matter who says what, You cant Polish a Turd


Yes you can......check out

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Mythbusters - Polishing Poop


BA


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Offline Ridge Runner
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« Reply #7 on: June 10, 2013, 01:25:08 pm »
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Well Hush my mouth Lips Sealed Lips Sealed

I think I have seen it all now, thanks for that.

Speechless, RR

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Offline xavierTopic starter
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« Reply #8 on: June 10, 2013, 03:19:54 pm »
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Quote:Posted by oli
I found this link

Hey thanks Oli that's a very interesting bit of document.

Regards
Xavier

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So many questions so little time
Offline alone_wolf1011
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« Reply #9 on: June 10, 2013, 09:57:05 pm »
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you can add my masanger şf you want that...  you can hunting in turkey with me if tyou have a quality deep radar...do you know somethings about turkey and turks?
,

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