?????????
You got me on that one.
The MXT is good for silver gold and especially pull tabs( as most machines)
But I have an Ace 250 as well; it operates at about 7kHz.
I've gone back over previously detected areas with my MXT and found all the
coins I missed with the Ace and believe me there have been lots of them,
so I don't know that your missing anything with your machine. The 14.75kHz
is I think the happy medium for detecting coins AND gold. In my opinion, that is.
The only way you might be missing coins is if you missed them in the first place because
of the way your swinging your coil. If your not overlaping of course coins are going to
fall through the cracks. The other way is if your machine isn't ground balanced properly
and the mineralization is masking coins.
I think the swing speed may have something to do with it to. If your swing it like your going to a fire
then I guess your missing alot.
I could be wrong. There may be other reasons, and I'm sure Uncle Willy and the others
can set you straight.
Enjoy your machine. Whites makes the best.
Katz