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6" DD 18.75 frequency coil

Elton

New member
I have read the FAQFAQ and was wondering.What do you use the 6" 18.75 coil for??

Ie: Trashy areas
Beach
Old Home Sights

Thanks for your reply.appreciate all the help I can get.
 
I got it for prospecting. But I haven't done that yet. So I use it on tot lots and other trashy sites. For a DD coil it pinpoints dead center real easy. With the sensitivity set at half it easily goes 6 plus inches deep. It is a keeper.
 
I use mine extensively for areas that are super trashy. Although it doesn't hunt any "deeper" than the 6-inch concentric, I believe it separates targets better. I like it in parks, yards etc. And once I get an old homesite located with the larger 3 kHz, I use the 6-inch DD to pull those old coins from amongst the nails. Great little coil. HH Randy
 
n/t
 
Thanks Men, appreciate it.
 
I also use mine in the trashy areas. The only problem is if there is a lot of tin foil or small pieces of metal. The 6" 7.5 concentric is not as sensitive to the smaller bits of trash like the 18.75 coil is.

Good hunting, John K
 
IS the discrimination better on all concentric coils versus the DD's
 
That 6" DD coil is really good at pulling out stuff in iron trash. Look for something a little more than a high tone chirp false. Go for those one angle repeating signals.
 
original.jpg


I use the 6" HF (18.75khz) DD for Prospecting. It is ABSURDLY sensitive to very small gold nuggets, quartz-gold specimens and other targets near the surface that other coils just can't even sense. Being in the 18.75khz range, it is nicely suited to Prospecting for Gold but this coil is also completely waterproof and has a slim shape, allowing it to be used in tight areas like under rock ledges in flowing creeks etc.

The main strength of this coil is that it penetrates soils fairly deeply compared to other coils. It has a very narrow detection field which allows the user to discriminate between targets that are close to one another. These targets might confuse a larger coil with a stronger, scattered field.

The 6" DD HF Coil compliments the Elliptical 5x10 DD HF Coil and is light enough to be carried in a backpack for scanning creeks and rock pools as a backup.

Cheers,

Marco
 
I tried my 6" HF coil prospecting in a very rocky area. It easily picked up this small bullet fragment that was 8"-10" deep. Sounded great.
 
So far all I have used mine for has been coin and jewelry hunting. I really like the coil. One thing I notice was you have to slow way down with it. Otherwise it is great.
 
Bill_S said:
One thing I notice was you have to slow way down with it. Otherwise it is great.


You're right about that. You have to take your time with it. Which is why I recommend this coil as a second coil rather than the only coil. The one for faster scanning and exploring is the Elliptical Coil or the 10.5" DD but these coils don't like the REALLY tiny targets nearly as much as the 6" coil. That thing is amazing. There's several frequency choices available for the 6" coil depending on what your needs are and what sort of items you want to hunt. For Prospectors, the High Frequency (18.75khz) coil is the one to use. I hear the 3khz coils are popular for those hunting silver.
.
I just rendered this image to show the differences in the coil fields on the Elliptical and the 6" (both are High Frequency 18.75khz DD Coils).
On first glance, you'll note that the Larger Elliptical Coil is reacting to the larger targets regardless of depth. But not so much the smallest targets. The main coil emission (Red) is wider and shallower than the "blade" in the smaller 6" coil... which is why the 6" coil is so neat for busy areas where targets are clustered. Whilst the 6" coil has deep penetration with a very narrow "blade", it has a much smaller secondary field (green). This makes it a specialized tool that I simply couldn't work without. Detectorists using the GPX machines sometimes miss targets that their detecting buddies can see with their 6" HF Coil on their X-Terras.

original.jpg


In actuality, there's just one field but it has a strong wedge (red) right down the middle and a weaker (green) area surrounding the disc. It's also mirrored somewhat on the top of the disc and it's useful when a detectorists waves a fistful of soil over it to see if there's a target concealed in the sample. The bright, green secondary field shows the effective and weaker area that will react to a target when swinging. The blue glow around the very minute targets (above) shows how the smaller 6" coil can react to them if the main blade of the emission field passes over them. The secondary field on the 6" coil (the green glow) is quite faint and small so you'll only detect targets on the surface directly under the coil or in the (red) main emission field blade. So using the small coil alone means you have to travel very slowly if you want the blade area to strike any potential targets. The bigger Elliptical coil allows the user to swing much faster and it will react when a suitably sized target nears any of it's coil emission fields. Finding larger to medium targets with the larger coils is easy. Smaller items need to be over a certain size and within a certain depth. The 6" coil will spot them all but with a much smaller field, it needs to be swung slowly. It's so sensitive that the user needs to adjust the coil for any special environmental conditions. I once was tempted to detect a mountainside using the 6" coil and found myself swapping coils because I was moving way too slow. But if I'm scanning a Mulloch heap or a creek, the 6" coil is incredible.

I put a sparkle where the Pinpointing hot-spot is likely to be. It's somewhat centered on the smaller 6" coil in the middle of the disc... and around the Minelab Sticker on the Elliptical coil (off center and towards the front). Tiny targets will be too faint for the Elliptical but the 6" Coil is amazing at spotting them... even minute targets buried below the surface and underwater. The very narrow and yet powerful (red) coil emission blade is so slim that it pinpoints VERY accurately.

original.jpg



As I mentioned before, both of these coils are surprisingly small and light. Carrying on on your pack and one on the detector is the way to go.
Just swap coils as needed.

Cheers,

Marco Nero
 
What a great post Marco Nero!!! After all that said, I would like to see Minelab come out with a round 14"(fourteen inch) 18.75 kHz DD for the XT-70 for prospecting. Come on Minelab, please make one.
 
Say David, wouldn't that make it a little front heavy? People with the 10.5" DD claim it's too heavy and makes their arms hurt. Wouldn't it need more battery power to run a larger coil with a larger field? I'm told that one of the reasons that the little 6" coils are so powerful is related to their size.

Cheers,

Marco
 
Where can I get one of these coils and what is a good price?
Bunk
 
Check any of the minelab dealers. Also check the for sale sections of the detecting forums. I've seen a wide selection of used and even unused X-70 coils go for $80 to $90 on several forums.

Good hunting, John K
 
Bunk said:
Where can I get one of these coils and what is a good price?
Bunk

I got mine on eBay. Their aren't many used ones available but you can save a few $$.
 
Well I can't belive that no one on this forum does not know where I can buy one of these 6" DD HF coils. Come on now, help a brother out, please.
Bunk
 
800-898-6673
 
Kellyco always seems to have a bunch in stock. That is where I got mine. As I said before, check the detecting sites on the web for used. When I looked a few weeks ago I found two 6" 18.75's for 80 to 90 bucks shipped. One was still new in the package. If you can't find a used one, I know kellyco or another Minelab dealer will have one..

Good hunting, John K
 
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