Power consumption of PI coils

[Anonymous]

COILTEKs newsletter on the release of their new Pro Range of DD coils says " Our PRO coils are so much more powerful than any previous coil they use twenty percent more power to generate the larger electromagnetic field. What this means is that with a PRO coil on your detector your battery charge will be consumed about twenty percent faster than with an ordinary coil"
As a matter of interest regarding the Operation of PI Detectors through Oridinary Coils do DD's normally draw more power than the Mono types?
Gary.

 

[Anonymous]

I know Coiltek have some improved coils but I don't know the details. Lowering the resistance of the winding, or the inductance, or maybe a bit of both will cause greater current to flow. If you can keep the number of turns the same, then a stronger magnetic field will result, at the expense of battery life.
DD's with the same inductance and resistance for the transmitter winding as a mono coil, will draw the same current. The fact that in a DD you have two coils, of which one is a receiver, does not cause the current to increase.
Eric.