DD Coil Balancing (Explorer)

[rickodetrader]

Hi All!

Firstly would like to say: Nice forum guys keep up the great work!

OK so now standard newbie question coming right up -> I hope to build a couple of custom DD coils for my Explorer SE and have a few questions...

From what I've read in the tutorial here: http://www.23hq.com/metaldetectorsse.../story/1674201 there is a necessity to balance both resistance (using different guage wire) and inductance to what is found in a "stock" coil. Just wishing to basically "back up" this info with some others who have created DD coils for there explorer/e-trac/safari etc or other projects.

Does the machine expect a certain impedance (resistance)? because to my way of thinking a coil which achieves equal inductance but lower ac or dc resistance should be better (assuming equal or less capacitance).

I would like to give a basketweave or spiderweave DD coil (high Q Rx + Tx) a go with this machine to see what depth and sensitivity to small objects... has anyone else tried this with a DD even in IB or PI? Any improvement in results

Cheers, rickodetrader

[plumabob]

I have built explorer DD coils. Keep things simple at first. Build your DD coil using factory specs...

TX 581 uH .88R
RX 472 uH 5.90R

The manufacturer built the coil to work at these specs. After you get a working coil you can experiment a bit but don't go to far off the original R specs. Possibly different types of wire or shape of your DD can increase proformance. I have had some good success with Sovereign coils of my own design that do improve performance as compared to a stock factory coil.

Good luck!

Bob

[rickodetrader]

Thank you Bob,

I will give that a go and see what happens.

Cheers, rickodetrader

[6666]

plumabob

I have a Sovereign Elite would your Sovereign coil designs work on my model ?

[plumabob]

Hi 6666,


The Elite is no different as far as coils go. Yes they work on the Elite and any sovereign ever made.

Bob