Sunray FZ12 coil question :shrug:

[Cal_Cobra]

I had a dealer tell me that the Sunray 12.5" FZ12 CZ coil was really only covering about 5" of ground at a time, because the center of the coil was the receive coil and it's only around 5" in diameter, even though the outer diameter of the coil, which he said is the transmit coil, is 12.5".

Although I believe that he has the transmit and receive coil part correct, the coverage aspect doesn't sound right to me

 

[tvr]

Only 5 inch coverage? Hog Wash ... generally.

I've hit double beep sweeps (both outer edges of the coil) down to between 2 and 3 inches depth with the FZ-12. The pattern of the detectable range is basically a cone shape under the coil and it will be narrower the deeper you go. Picture a cone; at coil surface the cone is wide and at maximum detection depth you may not even have 5 inches of effective sweep coverage.

As sensitivity goes up so does the spread. The cone kind of mushrooms. I've hit shallow coins that were outside the coil rim when sensitivity is set high ... just need to be wary of falsing when in discriminate mode and the sensitivity is up.

If you want to grid an area and are looking for all the deep stuff you need to move slow and make sure you have a lot of coil overlap; visualize the cone.

If you need to work close to fences and poles, turn the sensitivity real low and you can get closer since the field size shrinks (not mushrooming).

The smaller receive side seems to help be spot on with the pinpointing.

Cheers,
tvr

 

[PennyFinder]

Aw, he's just jealous 'cause he doesn't have one. Keep yours or snag one if you can, they are killer on beaches and soccer fields.


PennyFinder