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Offline ramTopic starter
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« Reply #30 on: November 12, 2010, 07:26:43 pm »
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hello xavier, in my dp harness going to coil i use rg58 50 ohm belden coaxial cable w/c i think maybe better than ordinary wire coz it is thickly shielded braid. is this true?

regards, ram,

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Offline xavier
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« Reply #31 on: November 13, 2010, 04:34:40 am »
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Hi Ram

Coaxial is good just don't make it to long what I do is measure the resistance of the coil with my length of cable attached to it. Also you must keep the capacitance in mind RG58U is 28.5pf per ft  RG6A/U is 13.5 pf per ft a lower capacitance is better.

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« Reply #32 on: November 13, 2010, 08:53:28 am »
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thank you xavier,

regards, ram,

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Offline danny475
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« Reply #33 on: November 13, 2010, 11:27:36 am »
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hi
yes it is for a pi detector
i have build the gary's pi metal detector and it was worst knowing that the coil was perfect 0.8mm i made several coils
and now i make the dp delta pulse and it was grate so you know in some countries it is forbiden to hunt or to sell any thing
in my country it is forbiden and if i'm coted they will rest me for 15 years minimum
so i need a coil that i can package it in a smal bag
i was thinking to put the coil in an ampty fishing rob and when i go to the hunting place i can get out my coil and fix it on the four fishing pistones they will be in the fishing rob
so i need a 110cm coil or 125cm coil can you help me for that
 

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« Reply #34 on: November 13, 2010, 11:15:07 pm »
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hello in my country very funny, you can do what you want specially metal detecting you can do build any type of metal detector,(the problem is the availability of electronic parts so many counterfeit parts) you can bring your md where ever no metal detector law. but if you can detect metal and unearthed is precious metal immediately there's a law if the unearthed is iron there's no law and the expectators will laugh at you.

regards, ram,

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« Reply #35 on: November 14, 2010, 11:43:57 am »
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Hi Danny475

I think that the best thing for you to do is turn your fishing rod into a pin pointer other than that I don't quite see how you're going to hide a 1.25m coil. Any how you can try a coil with 6 - 11 turns of 0.5mm magnet wire, that should get you going for a start.

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So many questions so little time

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« Reply #36 on: November 14, 2010, 12:50:31 pm »
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ok
they say that for a 1*1m coil you have to wind 16 turns of 0.5mm megnatic wire and when you want to increis the coil mesurment for ex: if you want to make a 150*150cm \1.5*1.5m you have to use less turns from the 1*1m coil
and if you want to make a 10cm diamiter coil you have to wind perhaps 40 turns of wire
so i want the relation between this two coils
thanks
tc danny

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« Reply #37 on: November 14, 2010, 01:54:25 pm »
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Danny if you have a schematic and they tell you to wind 15 turns on a former of 200mm (20cm) you can work out the length of wire used in the coil the formula is pi * D so one turn of the coil is 3.1416*20 =  62.832 cm for one turn so we have 15 turns*62.832 = 942.42 cm so if you want to make a coil of 50 cm in diameter you need to take the length of wire in one turn that will be 50*3.1416=157.08 so you take the 942.42/157.08=5.99 turns in other words 6 turns but you must remember that you will not have the same inductance in the coil Good luck mate

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So many questions so little time

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« Reply #38 on: November 14, 2010, 01:59:30 pm »
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thanks to you
nice information and teories
thannnnnnnnnnnnks


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pulse 2
« Reply #39 on: November 20, 2010, 02:51:51 pm »
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hi to all
i maked a gary's pi detector . it worked good.
It detected a ring from 8 inch in air
what result you get whith this detector?
how good is this ?
how deep?

tnx


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