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jarrow said:[size=x-large]'Where did these figures come from?......Jarrow[/size]
Hi there J......good question.
They are extrapolated from some experimental work on the data provided by the detector's VDI figures.
The idea is to try and determine what optimum frequency any coin would best respond to.........
Problem is, knowing the correct conductivity for the alloys of the coins concerned.........
Testing the same coins on the Whites V3, indicates a similar frequency ratio..... that of being HALF of the Xterra 705's
operating at a single frequency of 17 Khz approximately...........All a bit complicated by the coin size etc.
Hope that sketchy explanation gives you some clue to the origins of the original figures.......
Hopefully, one can then realise what frequency / coil best suits particular coins of interest.........MattR
Digdoggy said:As one of the guys mentioned the Digger coil is a little coin monster. 6" size helps me scoot around tree roots and stubble in the woods. Perfect for trashy sites. Even excels at cellar holes around old iron. Its deep! You wouldn't think so but its a "Hot coil" and a lot of us have had to turn sens down to 18, 19 because its so hot you can easily "overdrive" it and that will be seen as unstable and or incorrect ID. And we do not loose depth running sensitivity down like that. It starts performing better when turned down. Separation is wonderful. It may have seen those coins on edge as well.
I've chatted with good experienced coin shooters that love the 5x10 DD 18.75 khz. Others 10.5 DD 7.5 khz. And yes the digger 6"DD 3 khz. I know guys that won't take the digger off their machine.
I think the 3 just mentioned make a great arsenal.
I've been slowly and stubbornly learning that the location is the top variable. After that its - location.....none of this techy stuff matters unless we put these coils over the metal we seek.
kevmar said:Re Threshold ,make sure it's faint but audiable ,and not set to minus ,
otherwise small targets,or coins on edge will be hard to find.
Johnp3 said:Digdoggy said:As one of the guys mentioned the Digger coil is a little coin monster. 6" size helps me scoot around tree roots and stubble in the woods. Perfect for trashy sites. Even excels at cellar holes around old iron. Its deep! You wouldn't think so but its a "Hot coil" and a lot of us have had to turn sens down to 18, 19 because its so hot you can easily "overdrive" it and that will be seen as unstable and or incorrect ID. And we do not loose depth running sensitivity down like that. It starts performing better when turned down. Separation is wonderful. It may have seen those coins on edge as well.
I've chatted with good experienced coin shooters that love the 5x10 DD 18.75 khz. Others 10.5 DD 7.5 khz. And yes the digger 6"DD 3 khz. I know guys that won't take the digger off their machine.
I think the 3 just mentioned make a great arsenal.
I've been slowly and stubbornly learning that the location is the top variable. After that its - location.....none of this techy stuff matters unless we put these coils over the metal we seek.
OK Digdoggy... that was about all I could stand... I ordered myself a Digger today and it is on the way! Honestly, I've wanted one for a long time, but this is the straw that broke the camel's back. For where I seem to find myself swinging my detector, its a good fit.
Like you say, I really like my HF DD Eliptical but it does have it's limitations. I know this because its all I have ever used. I've used this coil for coin shooting, prospecting, and on the beach in Hawaii (took the detector in my bag as carry-on) and it's great. As you say, maybe in a few months I'll look at a third coil but I can't help but think I should have a concentric in the mix. The soil where I live North of Houston is mild/moderate mineralization and everything I've heard is that concentrics can be a little deeper in those conditions.
I went out last night just for kicks and swung a few arcs over the coins and still not much. Then, I thought "Hey, if the coin is straight up and down why don't I hold the detector at a slight angle sideways to the ground...". The result? Fail. Hey, ya gotta try silly ideas or ya never know, eh?