Whites Prism 6T

[Oldhunter67]

I have used my Prism 6T for almost a year now and the only thing it locks onto are pulltabs and small square nails . I have discrimination set at foil and thats it..sensitivity at 5 notches. Yesterday while hunting an old grange hall, old school I dug a Canadian 1859 One cent piece. It danced around 54- 57 but never really locked on. I duh it because it was at 7 inches. My bud was using a Spectrum and he dug 3 Canadian 1850's cents..2 barber dimes and a nice ring..I detected about 4 total hours at that site and dug only those that locked..of course that was pulltabs and a couple of square nails..Nothing else locked just danced with one sweeps showing 91's or 85's then go back over and nothing..I have no faith in this machine what so ever and am contemplating sending it back to Whites to be recalibrated..Any comments on this?

[GibH]

I've never had the 6T, but if I were at an old site I would dig everything. Deeper targets are going to bounce a bit.

[George (MN)]

A bounce of 3 numbers is pretty small, & the deeper they are the more bouncing there is. It should not bounce more than in air testing if your soil has no mineralization, but few people have ground like white Florida beach sand. Even a 4" deep coin may bounce 10 numbers or so in some ground conditions. If the average ID number of several passes is above the pulltab range, it is probably a coin. Of course nickels may ID as pulltab, foil or even zinc.

You should dig what repeats over several passes. If it just beeps sometimes, it may be junk, unless the coin is at the very limits of detection depth. Sometimes it helps to turn down the disc and just go by tones. A rejected target may give intermittent high tones, but if it is accepted, it will likely give consistent low tone.

I think in my inconsistent ground, having a detector like this with ground tracking is helpful. The tracking can be turned off in heavy trash areas where it might otherwise think all the metal is ground & track to that.

White's just sent me a new coil for my 6T as I was only getting consistent ID on quarter in air test to 5.5" & intermittent beep at 8.5". Now I get 13.5" on quarter, intermittent, sens at max & quarter beeps every pass IDs correctly at 11" (bounces few #s) with sens 6 bars. I've owneed about 40 detectors since 1976 & my depth record on coin is 7". HH, George (MN)