I was back at the beach today so i took my quarter with me to see where the 15x12 maxed out on depth.14 inches was a good practical signal,ie,would have picked it up as i walked along sweeping my coil at normal speed.Settings used were sensitivity 20,recovery 1,dp tones and ground tracking.Sensitivity at 20 was a good stable setting......22 was still fairly stable but didn't seem to make the signal any stronger.
I re-buried the quarter at 16 inches but i could only get the sightest response if i brushed the sand with the coil and because i knew it was there.....going over it at normal sweep speed it would have been missed.So a max practical depth,on my beach with settings that would allow a good signal to break through seems to be 14 inches on the wet sand on my beach with the 15x12.......i couldn't get any more practicle depth with sensitivity increases or by manually ground balancing.
I'm now wondering what the Mythtek 18 inch would be like on the beach.It's likely that i may get another inch or two on the quarter but the increase in ground coverage would be huge.Since using the 15x12 there has been a significant rise in the amount of signals im getting......mainly down to the extra ground being covered.So what about an 18 inch dustbin lid.........i did a few calculations and taking the extra coverage per sweep,sweep speed and length of session,over three hours the extra ground covered is enormous.So a bit more depth and a lot more area detected should increase the finds rates again.I'm tempted.