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Mars coils on a GTI
Posted by: steverii
Date: December 26, 2017 12:28AM
Anybody use a Mars coil on a GTI series detector? Are they well shielded? Thinking about buying a 15" Goliath coil for my 2500. Been finding some musket balls and minie balls in a disked field down to about 10" but got a feeling there may be some pretty deep below the level they are disking at. Anyone have experience with any of the Mars coils on Garrett machines?

Re: Mars coils on a GTI
Posted by: steverii
Date: January 11, 2018 11:06PM
Wow! 406 views and no replies. Appears I may be the very first person to ever put a MARS coil on a GTI !! Someone should speak to the marketing dept at MARS lol. Got the coil. Surprisingly light for its size. If it ever gets warm enough to venture outside and try it out I will post a followup. Unfortunately I am either not as hardcore or as crazy as John Edmonton to go out when it's this darn cold.

Re: Mars coils on a GTI
Posted by: Gamma_Joe
Date: January 15, 2018 08:23PM
Have you tested the imaging with the new coil? Does it show the target's depth and size as well as the stock Garrett coils?

I really like my GTI2500 ... best detector I've had, and I've used many others. Humble opinion, it's as sensitive for depth as anything out there, target separation is excellent, and the ability to see the target's size as well as its depth makes it a powerful detector. I've dug trash with other detectors, and the GTI would have saved me a lot of digging.

I'm just wondering how good the imaging is with the new coil.

Cheers,

Joe

Re: Mars coils on a GTI
Posted by: steverii
Date: January 15, 2018 11:02PM
Joe, I haven't tried the coil yet. But the only coils that image are Garrett coils. And even then, only the two imaging coils by Garrett, the 9 1/2 and 12" imaging coils. The coil has to be specially constructed to provide imaging.

Re: Mars coils on a GTI
Posted by: Gamma_Joe
Date: January 16, 2018 08:41PM
Thanks for the speedy reply. That's why I was asking, as the MARS coils have only the two windings (one Transmit and one Receive). I couldn't see how they could do the imaging with that setup.

The Garrett coils have the three windings (one Transmit, and two Receives). The two Receive coils have different diameters. In effect, we have two "cones" of signals in the ground, of two sizes and depths, coming back to the detector. By comparing the two signals, the GTI gets the target's size as well as its depth and shows that in the imaging.

I looked at the MARS coil advertisements, and didn't see any mention at all of the "imaging" -- either having it or not having it. I think they should have had a statement about that in their ad, as that's one of the main benefits of the GTI. To be fair to them, maybe I missed it.

Let us know how you're getting along with the MARS -- more depth and target accuracy? Is it better in the field, even without target imaging?

Cheers,

Joe

Re: Mars coils on a GTI
Posted by: steverii
Date: January 17, 2018 06:24PM
I bought this monster strictly for looking for minie balls down deep in a plowed field. Found a big one down a good 10 inches right at the limit of the stock Garrett 11" by 8" DD coil. The Garrett gets average depth in discriminate mode, but it is a depth monster in all metal mode. All metal is almost a non-motion mode. The processor is relatively slow compared to more modern machines, therefore recovery time between targets is slower. But in this field, targets are far and few between. So I don't believe masking is a problem in this field. There's not that much iron so I use all metal mode to get maximum depth. It was 1 degree above zero here this morning so it may be a while before I get out. But I am really anxious to try this 15 inch coil out. I will certainly be able to cover some ground with it! Will post as soon as I get to try it out. Happy Hunting, Steve

Re: Mars coils on a GTI
Posted by: Gamma_Joe
Date: January 17, 2018 09:20PM
I have to agree with you 100 percent on the GTI depth in all-metal mode. It easily sees dimes at 10 inches in air tests, with solid signals. I know air tests aren't the same as "in the ground" searching, but it's as sensitive and accurate as any other detector I have ever had. A used GTI2500 just sold on ebay for $455 last week with 20 bids on it. Not bad for an "older" machine.

I got a minnie here (Jacksonville, Florida) at 7 inches in a park. We have some Civil War skirmish history here, but only a little bit compared to other CW states. As you know, the GTI does a continuous automatic ground balance, so I think you won't have any trouble finding CW relics in your ground.

Let us know how the MARS coil works out -- worth the investment?

Cheers,

Joe

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