The Iron Circle Vs Ml Equinox 900

[HardPack]

Ran the ML Equinox 900 in circles today. Buried an iron axe head at 9 inches, two iron flat plates at 10 inches, a railroad spike at 8 inches, a bend horseshoe with nails at 10 inches and a 1981 US quarter at 8 inches next to a small flat piece of metal strap at 6 inches. Placed the quarter and the flat strap two inches apart in a center hole; then dug a radius of five holes 20 inches out from the center; placed the first iron plate flat at 9 o’clock; the second iron flat at an angle at 3 o’clock; the horseshoe flat at 12 o’clock, the axe head flat at 6 o’clock and the spike flat at 8 o’clock. Scanned the area with the detector then backfilled & compacted the holes. I then started my encirclement with the EQX11, EQX6 and Coiltek 10x5 coils.

Factory Reset FB the ML Equinox 900 after mounting each coil. With each coil detected All Metal in Park 1, Park 2, Field 1 & Field 2 search modes with the factory settings; used only simultaneous multi frequency SMF;  Sensitivity was set at 28. Performed a “Noise Cancel” then “Ground Balance” separately for each of the search modes. The ground (granitic clay) balanced between 36 and 41. Noise Cancel between -9 to 9. All targets were sweep from multiple angles.

 Summary the results for the three coils:

1981 US quarter: all coils detected at mid to low 50 non-ferrous positive TID and a ferrous negative TID for the flat strap (3/4”x 1 1/4”) in both directions. (US quarter air TID high 80’s).

Iron AxeHead: all coils detected the non-ferrous positive TID (mid 30’s to high 80’s); EQX11 detected no negative ferrous TID; EQX6 detected negative ferrous TID in Park 1 & Park 2; Coiltek 10x5 detected negative ferrous TID in Park 2  &  Field 1.

Iron RR Spike: all coils detected the non-ferrous positive TID (mid 20’s to mid 40’s); all coils detected the ferrous negative TID;  in all search modes.

Fe plate “flat”: all coils detected the non-ferrous positive TID (mid 50’s to high 80’s), EQX11 & EQX6 Coiltek 10x5 coils did not detected ferrous negative TID in any of the search modes.

Fe plate “angled”: all coils detected the non-ferrous positive TID (low 40’s to high 80’’s); only the Coiltek 10x5 detected ferrous negative TID in Field 1 & Field 2.

Iron horseshoe: all coils detected the non-ferrous positive TID  (mid 20’s to mid 40’s) in all search modes; all coils detected ferrous negative TID; in all search modes. 

 Note: In Park 2 and Field 2 with only the EQX6 coil, dropped the Sensitivity setting until some targets were no longer detected (14); Non-ferrous TID stabilized to a range of two to three (mid 40’s) indicating a positive target TID for the Axehead and both Iron Plates.  In these ground conditions, Sensitivity setting 22 yielded both a range of positive non-ferrous TID and a negative ferrous TID for all iron targets, except the axehead and iron flat plates.

 

 

This morning I returned to the iron with the 10x5 Coiltek in Field 2 search mode. Settled on All Tones, Iron Bias “0”, Sensitivity 22, Recovery “2” as starting point. Will field adjust as needed.