Yeah the standard 12" mono is a good coil but best for .8 gram & above I was told & has good depth, I will still use it but just after something that will also find slightly smaller pieces as well as still having decent depth, also want an elliptical to make it slightly easier to get into some of the tighter spaces between trees, bushes etc.
I'm just really after something that will be a good all round coil for now, doesn't have to find tiny pieces like the Sadie does but want it to find smaller than the standard 12" Spider, I want decent depth but I don't mind if it doesn't punch quite as deep as the 12' either.
I was told by GSA that I should stick with mono coils because the SPP is better suited to them & they will be better on this machine & as I don't know much about detectors & coils I will stick to them for now, I don't have the money to spend on testing coils so unless I can borrow one I'll just use mono coils.
I'm not sure what the ground is like around the Ballarat area but it hasn't caused any problems so far, the SPP has always ran very smoothly & has been easy to ground balance. Only think I did notice the other day was when I had it sitting on the ground while digging a hole, the humming seemed to change a little, sort of changed tone a bit, but there was a bit of rain & stormy weather coming & after talking to GSA, it was most likely some EMI effecting it so turning the frequency down a little should solve that.
I still have a bit of learning to do so will have to test a few thing out.