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6inch 18.75Khz search coil question
- Thread starter nickie
- Start date
The 6-inch DD at 18.75 kHz could probably be considered the "favorite small coil" of X-Terra users. I use mine anytime I am hunting in trashy sites that require superior target separation. And in areas that limit my normal sweep path. Depth will vary according to many factors (soil mineralization, target conductivity, target placement etc). But I would not hesitate to say that I've dug dimes at depths exceeding 6 inches. And, I have no doubt it would find a 53 Buick at 3 feet. 
Seriously, the 6-inch HF coil is an excellent choice for jewelry hunters, coin shooters and Prospectors. If you take a look at the FAQFAQ section near the top of these posts, or do a search for the 6 inch X-Terra coil on this forum, you'll finds dozens (if not hundreds) of posts about it. HH Randy
Seriously, the 6-inch HF coil is an excellent choice for jewelry hunters, coin shooters and Prospectors. If you take a look at the FAQFAQ section near the top of these posts, or do a search for the 6 inch X-Terra coil on this forum, you'll finds dozens (if not hundreds) of posts about it. HH Randy
Randy,thanks for the feedback.I will go through the material on the forums tonight.I'm thinking of using the 6"hi frequency for jewelry at the beach waterline but the size of the coil is what has me a little skeptical.
What I should have asked was what is the best coil for jewelry at the waterline.
I'm a newbie at this but after the two pieces of jewelry I pulled out of the sand yesterday I think I'm hooked for good now.
My Xterra came with the mid frequency Double D but that coil is not waterproof,so rather than ruining it,I am trying to see what my best option is.
Thanks again.
What I should have asked was what is the best coil for jewelry at the waterline.
I'm a newbie at this but after the two pieces of jewelry I pulled out of the sand yesterday I think I'm hooked for good now.
My Xterra came with the mid frequency Double D but that coil is not waterproof,so rather than ruining it,I am trying to see what my best option is.
Thanks again.
Theoretically, the lower frequency coils are best suited for higher conductive targets such as silver and copper. And higher frequency coils are best suited for lower conductive targets such as gold. But in my opinion, there isn't enough difference between 3 kHz - 7.5 kHz and 18.75 kHz to show an appreciable difference in depth or ability to hunt coins and jewelry. Any of the three frequencies will find just about anything metal, regardless of the conductivity. I see more of a difference in the audio tone produced than I do the actual detection. So if I were hunting the beach, and had to have a waterproof coil, I'd probably opt for the 6 inch DD at 18.75. Excellent separation and surprising depth. The downside is that the small coil doesn't cover much sand in each sweep. If I already had a larger DD coil, as you indicate you have, I'd probably buy a tube of silicon sealant and seal the coil seam, as well as put a glob on where the cable enters the coil. Since the plastic used in all the coils is the same, I'd have to surmise that the seams and cable entrance are the two vulnerable spots. If I were going to purchase another coil just for beach hunting, I'd probably buy the elliptical 6 X 10 and seal it up as described. It will cover more ground with each swath (compared to the 6-inch), it is lightweight and easy to swing. And, having that higher frequency in a DD design isn't going to hurt a thing while hunting the beach. JMHO HH Randy
I was thinking of doing a seal on the coil with marine epoxy and then around the cable entrance I was thinking of using epoxy and sealant for underwater cables on top of the epoxy just so I could be certain it would be watertight,but I was not sure if a modification like that would affect the coil or not.
Silicon sealant will adhere well, yet remain flexible. (necessary if you experience torque on the coil or pressure on the cable) The epoxies I've used for other projects are not flexible. Regardless of what you chose, know up front that Minelab is not obligated to warrant a coil that has been modified or is used under circumstances it is not designed for. JMHO HH Randy