Detecting in South Africa

Keep us posted, and take pictures.
Viking

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Hi Akiwi
The more the merrier mate.
We would love to hear from you.
Viking

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		Quote:			Posted by xavier
	Hi Pgill What you have to do is measure the resistance of your coil (I take it that it's a PI) you also need a ferrite rod like you find in the radios you then wind wire round the rod till you have the same resistance if you have an inductance meter you can measure the inductance of your coil and the resistance now you have to try and make a matching coil (I find that it works best like this) using the ferrite rod as a support. If you are using a VLF detector then you will have to make a pin-pointer you can make a very simple one using the BFO technology or with PI but that will be more work. All the best Xavier        PS Don't ever buy a Labtec wireless keyboard or mouse they are totally useless (rubbish)  .

A ferrite rod antenna with the same resistance as the original coil may actually catch fire, Xavier. The smaller wire will be the reason. I wish people wouldn't put so much importance on resistance. The frequency is dependent on the inductance. The resistance is the ability of the coil to absorb the power of the field applied to it. In a PI detector, that can be 200 to 300 volts in some cases with a current of 20ma. That's enough to cause some serious heat is small diameter wire. I just don't know how to make this any clearer. Resistance is meaningless and should be ignored unless it is too LOW. The lower the resistance, the more potential for damage to both the circuit and the coil.

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  Drat, am I causing problems again  I have the Garrett ace 250 detector which would love an inline probe..... I have a multimeter for Ω  but not an Inductance meter... What I would do is to start with my toy BFO detector first, then the Tesoro before I touched the Ace... But it is the Ace in the end that I would like to have the probe on....
I guess, then what I need is the inductance meter?? 
Guys, how about writing up a tutorial that can help me and also that I can place on my website for others? that would be great  Both of you have great knowledge in this area....

Akiwi, welcome to our small group of misfits  we do have good fun here, and as you can see, I also stir the trouble  but I love it.... You can also sign up on my website, there is some good stuff on there.

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		Quote:			Posted by xavier
	GD he dose not have an inductance meter the only reference that I can give him is the resistance. The one that I build did get warm so I added a resistor of 100R in series with the coil and it's working great now.

There is no direct relationship between inductance and resistance. His coil may not work at all. Giving him a resistance value is like telling you to adjust your detector while eating vanilla ice cream rather than chocolate.

Posted on: January 23, 2011, 10:56:30 PM

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		Quote:			Posted by viking
	And Xavier you should know better than to talk dirty electronics in front of GoldDigger.

He can't help himself. He's a junkie and I helped to create him! LoL

He loves it when I talk dirty back to him, mate.

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