I am very interest on the xterra's 15'' coiltec coils. I own the 505, and it's very impressive detector. I need a bigger coil and my ground is high mineralized and has been searched before a lot of times. I want to get except the large targets the very tiny. Which would be the best frequency for me to use? Thanks for help in advance.
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Need advice on which coil should i use
- Thread starter cypearl
- Start date
The size of the 15" coil will work against you if very small targets are the objective. Coin sized targets at depth it will excel at, but smaller objects become more difficult for the big coil to respond to.
As far as frequency goes, I would probably go for the 7.5kHz coil, unless there is almost no trash in the area. The 18.75kHz 15" is so hot that it can't let anything get by without alarming you to it's presence. The 15" 7.5kHz is hot, but has the most uniform target bin segment widths, so it will deliver the most accurate TIDs and miss the least.
As far as frequency goes, I would probably go for the 7.5kHz coil, unless there is almost no trash in the area. The 18.75kHz 15" is so hot that it can't let anything get by without alarming you to it's presence. The 15" 7.5kHz is hot, but has the most uniform target bin segment widths, so it will deliver the most accurate TIDs and miss the least.
As a matter of fact, I just got back in from a short hunt with one. They are deep seekers that hit hard on modern silver, copper, and brass, but do poorly on ancient hammered coins, gold, lead, and pewter.
High conductors like silver copper and brass.cypearl said:So for what are they made for?
Not unless you're looking for low conducting ancient silver, gold. lead, pewter, or other low conductors.cypearl said:
High conductors respond to low frequencies better.
Low conductors respond to high frequencies better.
Small coils see small targets better than big ones, but are depth limited.
Big coils see deeper targets than small ones, but are more likely to miss tiny targets at depth.
So the real questions are,"How tiny is the "tiny" silver that you're looking for?" and "How deep?"
I am searching for everything by the way also searching for ancient copper and silver coins, gold coins if they could be found of course. But if these coins are big enough could they be missed by the 3kh because I found a hammerd silver coin 1/4 of an inch in size with a high tid number about 42.?
If the hammered coins that you're finding are comming in with numbers that high, then a 3kHz would work fine.
In the UK, the hammies generally register lower numbers (often in the 20's or lower), and for those the 3kHz coil isn't a good choice.
For all practical purposes, anything that will show up at 28-30 or higher the 3kHz will hit on hard. Any lower than that and a higher frequency coil would be preferred.
In the UK, the hammies generally register lower numbers (often in the 20's or lower), and for those the 3kHz coil isn't a good choice.
For all practical purposes, anything that will show up at 28-30 or higher the 3kHz will hit on hard. Any lower than that and a higher frequency coil would be preferred.