Used dfx

[gwhamil]

Hey guys, just got a used dfx. I believe it has a dtech 10" DD coil. I have only been able to put in a few hours on it so far mostly using the stock coin mode with ratchet disabled and vco enabled. My question is this. I have dug up tons of rusty squashed bottle caps from just under the surface. They are so close to the surface that my autotrac pinpointer picks it up before I dig. This is a very trashy park site. It always rings in with a vid in the mid 80's, a quarter icon, a nice signograph with one or at most two large bars right next to each other, and a nice unbroken audio signal. Adjusting bottle cap reject doesn't seem to make any difference. First off, I didn't think bottle caps were supposed to hit in the 80 's. Am I doing anything wrong or is this just the nature of the beast? Other than this,I am loving the machine. Any comments or suggestions?

 

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[FreeMindStuck]

Hey guys, just got a used dfx. I believe it has a dtech 10" DD coil. I have only been able to put in a few hours on it so far mostly using the stock coin mode with ratchet disabled and vco enabled. My question is this. I have dug up tons of rusty squashed bottle caps from just under the surface. They are so close to the surface that my autotrac pinpointer picks it up before I dig. This is a very trashy park site. It always rings in with a vid in the mid 80's, a quarter icon, a nice signograph with one or at most two large bars right next to each other, and a nice unbroken audio signal. Adjusting bottle cap reject doesn't seem to make any difference. First off, I didn't think bottle caps were supposed to hit in the 80 's. Am I doing anything wrong or is this just the nature of the beast? Other than this,I am loving the machine. Any comments or suggestions?

It is typical for bottle caps to hit in the 80's. For some reason dd coils love em. You can try the technique called rimming. Pinpoint the suspected bottle cap and then sweep it with the leading edge off the coil. If it changes and appears to be iron it's a bottle cap.

 

[gwhamil]

Thanks for the tip. I will give it a try. Would I have the same problem if I purchased a 950 coil?

 

[FreeMindStuck]

Concentric coils are about 10 percent less sensitive to iron and emi. You'd still have the same problem, just not to the same degree.

 

[gwhamil]

Thanks again for the help. Well try rimming this morning.