MAKING COILS,

ARE THERE ANY GOOD BOOKS ETC ON MAKING COILS AS I WAS THINKING ABOUT MAKING A COUPLE USING LITZ WIRE FOR 48KHZ VLF DUE TO LACK OF RANGE AVAILABLE,MARK

There's nothing published about building IB coils, only PI mono's. To ask your questions, I suggest you
register and look here: http://www.geotech1.com/forums/forumdisplay.php?s=64b9f6d52d31fa0c0daaa071b2ef46a3&f=6

If are chasing bigger coils for Whites Goldmasters, try Jimmy Sierra:
http://www.jimmysierra.com/loopsZ.htm

Good luck. Graham

Thanks, my problem is that they all seem to have new dd coils but none have monos which seems to defeat the purpose in low mineralised soil and trying to get max depth

Graham, thanks for that link as they have 12' conc to suit gmt ( hot shot). Do any body do mods for these.,mark

Gdday Mark

You are probably well past this but if you havent had a read , it explains all about coils, how they work etc.

https://golddetecting.forumotion.net/general-information-f22/understanding-your-detector-and-the-coils-t992.htm

Jeff

Thanks Jeff, Ijust thought i had it down pat till i got to the multiple frequencies for vlfs for the same coil , as i cant understand how multiple frequencies from the same machine can suit. Do they work on multiples of the same frequency with two freq then altered to the lower of the three ie if 7,14, 21 all to 7khz, mark