15x12 SEF for F75/F70 now in USA

Just saw it on Kellyco's website.
[www.kellycodetectors.com]
I have not heard much about these. Any thoughts on the Ltd with the cache mode and this large coil?

Interesting. I am always skeptical about aftermarket coils. I would be curious to know who the design engineer is of (specifically) the F70/75 SEF coil. Although coils are somewhat simple in design..................it is most always the design engineer of the specific metal detector that knows just exactly what coil design parameters (impedence, RC/RL network, resonant freq w/harmonics etc....) works best on his invention/detector. The best experience I have ever had/logged with aftermarket coils; was having a aftermarket coil nearly 'match' the performance of a comparable factory coil option. I have not had one exceed the performance of a factory/stock coil.
BUT..........one of these days..........it just may happen.

I have also observed: When a Mfr does not send a new widget out for a field-test.......there's usually a underlying reason; which, in turn, is one of my 'measuring gauges' of new product performance "confidence". ((( real-world testing being the 'finalization' ultimate test ))).

I`ve known lads who`ve bought them for the F75 here in the UK . They reported ,NO noticable increase in depth noticed at all . Only better ground coverage .Oh! and besides upsetting the balance . Its like having a slab of concrete on the end of your detector.



Edited 2 time(s). Last edit at 01/23/2010 06:30PM by Jeb.

Better coverage would be great, but would you be trading off target separation as well?
I worry that having a coil that heavy would risk damaging the f75.

I did read a field test out of Europe and they stated pretty much the same as Jeb, no major depth gain but better coverage.

If both coils ascertain the same depth; I would most certainly opt for the smaller "target seperation" coil vs. the large "ground coverage" coil.

The F75 is a very light and balanced machine...to cover more area but not get more depth at the risk of stressing the design of the machine seems to not make sense. I think if that was what Fisher wanted to do they would have added a larger coil?

LowBoy

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If you don’t dig it, then how are you going to know what you’re missing!
How can you have your pudding if you don’t eat your meat!

Might be good for the beach, but can't imagine using it anywhere else.

Hi,, I'll take mine without anchovies....If I want to swing a pizza I will go to Pizza Hut and swing one right into my car....LOL....JJ