BIG coil air test for anyone interested:smile:

[yowow#1]

Air test don't mean doodly squat to most, but just for entertainment, what the hay?

3 different detectors with large coils.

first a Tesoro Vaquero with a NEL 12x13 Tornado coil: settings are,,,, max sens and threshold to stable...= 11.5" on a U.S. quarter...

Second a Whites V3i with a 12x15 SEF coil: settings are,,,,,sens is 90,,, recovery is 70,,, Rx is 13 = 12" on a U.S. quarter

Third a Minelab xterra 705 with a NEL 13x14 storm coil: settings are sens 25,,, threshold 20,,,, AM mode = 12.5 on a U.S. quarter



Good luck and happy hunting...

 

[Mega]

When people put a bigger coil on a detector they expect a instant massive depth increase on coin size items that is not the case,you will get a small increase i dont deny that but its on relic size items that you will see a real differance on say a CW buckle or that type of size item then the depth advantage can be a fair amount.

The trade off is gaining depth on larger targets but loosing out the sensitivity to smaller items,the other big problem with using a larger coil is the coil can and will try and pick up multiple targets and can confuse the detector very easily,on open pasture land that is free from rubbish then a big coil earns its keep.

 

[Elton]

When advertising had to be a little more accurate.............. The bigger coils most always said 20% more depth.

Well if your getting 6" say..........figure 20% of that.............. it's not the figure some try to project in todays advertising is it ????....

 

[tabman]

Since a dime is the most likely lost silver coin, I wonder which coil and detector combination would get the best depth on one?

tabman

 

[Elton]

I would say the coil made and tuned to the detector.. That is figuring the loss of sensitivity to small items using a large coil.......

I have always felt the manufacturer making the machine, and coils had the best set up if they were a serious maker of metal detectors.. They specifically tuned that coil to that machine.. ???????????

 

[kaolinwasher]

thats not much improvement over the stock tesoro coil, I think i would be bettor off with the Tesoro 5x10 DD and buy it from one of the find mall sponsors . I think some detectors just have a certain limit they can push a signal down I remember how disappointed i was when i got a 15" execrator coil for my M-6 and it just was horrible and i found that over time with different detectors the bigger coil was not alway that much deeper the SOV GT did go deeper with a bigger coil interesting test . thank you for doing it . it is helpful

 

[yowow#1]

I would never use a large coil for coin shooting, that's just not their purpose, i primarily hunt open areas, "old farm fields and the like, and they cover a lot more ground quicker. The depth numbers posted are solid unbroken signals, you could probably add an inch or two per coil for choppy type signals. the minelab 10" DD is pretty close in air depth as the NEL 13x14 coil but the minelab 9" is not. Good hunting to all.

 

[yowow#1]

thats not much improvement over the stock tesoro coil, I think i would be bettor off with the Tesoro 5x10 DD and buy it from one of the find mall sponsors . I think some detectors just have a certain limit they can push a signal down I remember how disappointed i was when i got a 15" execrator coil for my M-6 and it just was horrible and i found that over time with different detectors the bigger coil was not alway that much deeper the SOV GT did go deeper with a bigger coil interesting test . thank you for doing it . it is helpful

Hi kaolinwasher, I went and checked the air test on the tesoro stock 9x8 coil and the results were

Sens and threshold set to stable got 9" on a U.S. Quarter
Sens and threshold "maxed to chatty" got 10.5" on a U.S. Quarters

The same test with the NEL 12x13 tornado coil "maxed to chatty" got 13.5" on a U.S. Quarter


This post isn't an ad for any manufacturer whatsoever, just an offer of some entertaining info... Good hunting to all

 

[Rainyday101]

Interesting test results. Thanks for taking the time to post them!

 

[hershey1]

Minelab FBS machines ( E-Trac, Explorer & Safari ) really do well with the 15 inch WOT in the beach environment. 18 inch dimes are normal. Now with my F-75 LTD that I relic hunt with I prefer the 11 inch factory over the 13 inch Ultimate even though the Ultimate gets a tad more depth it is more of a hassle in the woods. Now the 13 inch Ultimate on the G-2 is a huge increase in depth. Just my experience with larger coils. Thanks for your time yow-wow

 

[kaolinwasher]

yowow 13.5 over 9" is good actually very good , I was thinking of getting the 12x13 now i just may do that , thanks for testing

 

[yowow#1]

I would say the coil made and tuned to the detector.. That is figuring the loss of sensitivity to small items using a large coil.......

I have always felt the manufacturer making the machine, and coils had the best set up if they were a serious maker of metal detectors.. They specifically tuned that coil to that machine.. ???????????

I can certainly understand that statement Elton, But,, I also believe that there are companies that notice things like "automotive" parts and say, 'i can make a better performing part for that product and they do,, on a consistent basis.. good hunting to all.

 

[Rainyday101]

I would say the coil made and tuned to the detector.. That is figuring the loss of sensitivity to small items using a large coil.......

I have always felt the manufacturer making the machine, and coils had the best set up if they were a serious maker of metal detectors.. They specifically tuned that coil to that machine.. ???????????

I can certainly understand that statement Elton, But,, I also believe that there are companies that notice things like "automotive" parts and say, 'i can make a better performing part for that product and they do,, on a consistent basis.. good hunting to all.

Elton you guys got me thinking on that one. As far as the manufacturer making the right matched/tuned coil for thier detector, I am having second thoughts on this one. Take for example Tesoro, they make the HOT series coils and they can be used on the Tejon, Lobo, Vaq, and Cibola. BUT of these four detectors they work on- there are three different operating frequencies. Only the Vaq. and Cibola are the same freq. So these coils are close enough to work on three different frequencies? That doesn't seem like an optimal solution. So I do believe an aftermarket company could make a better tuned coil and possibly shape the transmit field better.

Just thinking out loud here.