DD-coil specifications from Eric Foster coils wanted.

[GeoMax]

Hello,
Does anyone know the specifications of the DD coil that Eric Foster built for the Goldquest and/or his other detectors?
Thanks in advance...

[Detectorist#1]

Hi GeoMax,
Using of DD coils in pulse detector in motion mode with attempt to avoid long recovery time after the signal from a big near target is not easy problem. White's TDI project gives a solution with adding of J113 switches for fasting of the recovery time but with mono coil.