EL NINO77

that's true,and also the standard coil-size is not too sensitive to the tiny golden chain ...

Iron bias and recovery speed with adjustable items -DIFFERENT PROGRAM SETTINGS IN THE MANUALS , each with their case according to the situation .,and ground...-no problem...

Low Iron Bias is not decrease a short coinage signal in long iron, or a nail type --- o --- o --- o --- o ---, the large iron bias is partially or fully signal decrease from the coin. it is not so much a problem with a short signal of iron, nail, and coins in terms of type : I o I o l o l o I . For a high recovery rate - very short iron and coin signals, use of low iron bias will not the decrease signal of coin in iron. Iron bias also suppresses the short signs of mineralization of the ground, EMI, but also deep and weak signals of coins in the ground.

In Whites Spectra V3 bottle cap Off/ and bottle cap On / seting1 its big diference for unmask coin in iron...depend on location iron and coin, -produces better "full range" signal iD and audio ouput...better-bledy audio....In Argo and Optima i use minor "mask"-iron bias 2-3.max for better unmask...

In 2 tone, 5 tone ,50 tone,...tone ID..

Iron bias - it is filter -short signals audio -for unmask ,type- silencer-xp bottle cap reject- whites.....in minor setting Iron Bias + optimum recovery speed- it is unmask better...in iron sities.... Great "vizual-audio" test for optimum setting iron Bias its :7 X small -medium coin and 8 X-4" nails about in Line...,..2 .test coin beside horseshoe, 3.test nailboard test..

Mike your settings in Test for Spectra for 6x4 shooter?,Rx gain, Ds , recovery speed,and ground filter?, thanks...