Aha, one more thing! To void confusion; my present coil is not 28cm like it was before - it is 24.5cm now. I used scraped Minelab TS1000 coil enclosure and made suitable coil for IGSL, with: 6mH for TX and 6.5mH for RX. So 28cm for same coin in air tests is not such bad result after all. Todays results are more that satisfactory: no masking at all (actually, masking is not possible with such design, that's why i make it!), no false signals at all, GEB is PERFECT, response even on smallest metal items is momentarily - no delays at all! Various adjusting combinations of those 2 "Disc" potentiometers gives me variety of mixing between two "ranges" (wanted and unwanted targets-alloys)! So... i think "this would be beginning of beautiful friendship"!

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