COIL INFO FROM FISHER

My F70 is at Fisher Labs for repairs and I told them I was interested in getting an F75 11" DD coil for it, they called me yesterday to say the repairs were done and ask if I wanted the DD coil, they said my machine would need to be calibrated for that coil, they say for that coil to work properly the F70 needs to be re-calibrated, I was under the impression it was compatible with the F70,so I decided to wait on getting it. If they calibrate my machine for the DD coil does it need to be done again for the stock coil?

interesting let us know what happens

LowBoy

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Mine seems to work fine...please let us know if there is a need for re-calibration. (although I can't imagine this detector working much better than it already does).

Called Fisher today and Felix had me talk with Danial, he is one of their techs. He said that the F70 does NOT need to be adjusted for the DD coil, he was not sure why that note was put on my machine and said he would talk with everyone there to make sure they are on the same page. He said the F70 and F75 could use any of the 4 coils available. I am now going to order the 11" dd coil! I also want to thank Fisher repair lab,they do a good.

On F70 ID is nearly 'spot-on' whilst switching between stock 9-3/4" stock elliptical vs. the 7"x11" DD.

It is my understanding that the difference between a DD coil and a regular elliptical coil is that the DD is like two donuts side by side and the elliptical coil is like a small donut inside a bigger donut.
Of course that is a exaggeration. But reasonably close. When you start talking coils and resonant frequencies then I could see some tuning if the frequencies were different between a F70 and F75. They are both 13Khz based on the spec sheets I have seen. So they should be fine.

On the f75 it is a DD and the small coil, the small coil is consentric and it will work on bough, I don't see why the f70 will not do the same.

Wingnut, your coil description is correct.
--- And all F70 & F75 coils are interchangable.