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how about 15x12 inch Excelerator coil

If you get one make sure you get this one. (WHITE)

[attachment 246772 2012-10-18_134239.jpg]

I hunt mostly coins and the 10x12 is a big as I go.

The 22.5 kHz frequency on the V3i is the touchy frequency. I don't know how far we would have to drop from 22.5 but if the frequencies were 2.5, 7.5. 15 kHz we wouldn't even need V rated coils. The SEF coils have their problem with 22.5. All the SEF will all work in single frequency 2.5 and 7.5 kHz.

If you ordered I think it would be best to order closer to home in case you need an exchange.
 
I had one in black and it did go deep. Goodluck getting a properly nulled one.... I have had a total of 5 of them that couldn't be turned up past 7-10 gain on the good ones.
 
Cypearl,

Here is the review I did on the optimized (white) SEF. This was a good one. My first coil was not nulled correctly. Burlbark never got a good one.

Optimized (White) 10x12 SEF Coil Review

Well, I got my white-colored Detech SEF (Symmetric Electromagnetic Field) coil that is optimized for use with the V3i and VX3. Of course the first thing I noticed was its white color. The white colored coil does not absorb ultra-violet rays as much as black colored coils and subsequently the coil runs at a lower temperature. This reduces the internal coils induction balance drifts which are caused by exposure to direct sunlight. This gives a better stability to the metal detector.

Next I weighted the coil. My SEF weighted less than my D2. I weighted it a second time but I got the same results. The coil is center mounted so it has excellent balance. If the SEF is actually heavier then the D2, I cant feel it.

My old (black) SEF, which was suitable for Whites DFX, MXT and M6, did not allow me to get the best efficiency with my Spectra. This was due to the nulling which is not optimized for the 3 frequencies the Spectra uses. It was possible to use the old SEF with a single frequency 2.5 kHz, 7.5 kHz but in multi-frequency and single frequency 22.5 kHz I had to decrease the sensibility considerably. The use of Boost Mode was out of the question. The black coil always overloaded. For the guys that are running the black coil, I think if you will check you will see you are running higher signal loss at lower RX settings.

[attachment 247218 2012-10-23_132533.jpg] [attachment 247219 2012-10-23_132601.jpg]

Here are two sets of readings, one with boost and one with boost off. The area that I took the readings at was a high EMI area. I just wanted to show the coil can handle high settings.


So, let
 
Guess I never got a "good" one either. I got a so-so one.

Typically if the area is low EMI I can run this coil, buried power lines or a transformer within a couple hundred feet will kill it though (even 1/1/1 will constantly false). It's the most EMI sensative coil I have ever run.

If I am in a good area I can run the RX from 8-10 and the sens up around 92. With these settings I find that the coil goes slightly deeper than my D-2 (at 12/70/92 my D-2 is a monster), finding dimes at 7-8 inches and quarters at up to a foot. The main advantage that this coil has over the D-2 is that it covers ground much faster.

If I plan to go to a farm field, this is my number one choice. If I am doing a school or a park, I will probably pack the D-2.

If I had to do it over again I would probably buy the small SEF, seems to be more stable.

Also, the white one is lighter than the black one (slightly heavier than the D-2, but better balanced I think). And the coils signal typically stays in the 15-20% range unless its > 80 degrees outside and I am in the direct sun, then it will run up a bit (up to as much as 32-35%), but this has never seemed to make the coil unstable.
 
10x12 or 15x12 if you get one with a good null you are fine. If they can't make guys happy with the 10x12 what chance does a 15x12 have with more dirt to contend with under the coil. Consistent production is the problem.

This why early V3 coils had a problem. The null was changing after they left the factory. It takes a very exacting coil null to work with the 22.5 kHz frequency.

There are over 10,000 different epoxy mixes and something as minor as how cold it got coming in on the truck can cause nightmares in manufacturing. If there is an issue with epoxy, it can take hours, years, or decades, for it to develop to the point of causing an issue, difficult to test for issues, expanding and contracting beyond normal, and shifting the positions of the wire inside the search coil, thus causing the tune to fall outside specifications. Yet epoxy is still the best and most reliable form of framing and used by all (100%) metal detector manufactures.
 
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