GTI 2500 Detection frequency question

[Fraulein]

Hello! I am still learning how to use my Ace 250 and I am loving it. However, I am starting to look at other detector for when I have made my classes with the Ace 250. I know my Ace 250 will remain an important tool but I also want to venture toward gold prospecting for nuggets. So far I have read that detectors with high frequencies (in the 15 + kHz) are best for gold prospecting.

According to the Garrett catalog on page 3 the GTI 2500 is highly recommended for prospecting, the same recommendation as for the Scorpion Gold Stinger from Garrett. The Scorpion working frequency is 15 KHz. I also saw on one of Garrett's competitor, a model that adjust between 1 and 100 KHz.

In the Garrett catalog it is said that the GTI 2500 works on a 7.2 KHz it also say it is adjustable. However they do not say how much adjustable and I could not find this information on their website either nor in the instructional videos. So how much adjustable is it? Between 7.1 and 7.3 KHz? Or is it adjustable also in the high teens KHz????

 

[danGeorge]

CALL.......BRAD KEEL @ 800-527-4011....ext 734 GARRETT OFFICES.........HE SHOULD BE ABLE TO HELP................danGeorge

 

[coach c]

The frequency is adjustable only to get away from EMI. It adjusts very little and definitely not enough to make a difference in being a higher frequency.....Coach

 

[John-Edmonton]

The GTI 2500 in motion discriminate will pick up larger nuggets of gold, or smaller ones more on the shallow end. However, using the GTI 2500 in the true all metal mode will fair much better. The higher frequencies tend to fair better for punching deeper into the ground, however, the set up of the electronics also plays an intrical part also. The best machines to find gold are the ones designed especially for gold. Garrett has two such machines.....the Scorpion and the Infinium. I have done real well with my Scorpion finding gold rings on land. My Infinium has done real well with gold rings in the water. Most people who hunt often, will own more then one detector. I presently own own 10 metal detectors, and use different detectors for different types of searches be it beach hunting, water hunting, relic hunting, coin hunting, woods hunting, sports field hunting, old field hunting etc. just to name a few. No detector does it all, however, the GTI 2500 is quite adaptable to different environments. Another consideration is the size and type of coil you are using. Sometimes switching a coil on a metal detector will make it a totally different metal detector. It is often cheaper to add a new coil to your arsenal, then it is to add a new detector, while still getting the same results. Below are all my rings forund ast year, 2009, using the Infinium, the Scorpion, and the AT3. Garrett detectors ain't no slouches for finding gold or silver.

 

[John-Edmonton]

Forgot to mention....adjusting the frequencies on the GTI or GTP detectors won't make any noticeable differences depth wise, however will allow other metal detectors to detect closer to you and possibly remove some local EMI in your area.

 

[John-Edmonton]

n/t

 

[John-Edmonton]

n/t

 

[dahut]

Hello! I am still learning how to use my Ace 250 and I am loving it. However, I am starting to look at other detector for when I have made my classes with the Ace 250. I know my Ace 250 will remain an important tool but I also want to venture toward gold prospecting for nuggets. So far I have read that detectors with high frequencies (in the 15 + kHz) are best for gold prospecting.

According to the Garrett catalog on page 3 the GTI 2500 is highly recommended for prospecting, the same recommendation as for the Scorpion Gold Stinger from Garrett. The Scorpion working frequency is 15 KHz. I also saw on one of Garrett's competitor, a model that adjust between 1 and 100 KHz.

In the Garrett catalog it is said that the GTI 2500 works on a 7.2 KHz it also say it is adjustable. However they do not say how much adjustable and I could not find this information on their website either nor in the instructional videos. So how much adjustable is it? Between 7.1 and 7.3 KHz? Or is it adjustable also in the high teens KHz????

John makes a good point, although his picture is misleading to the newcomer. He shows rings, which are made of alloyed gold and behave like single loop inductors - just the thing for the 2500. But such things are vastly different than nuggets out in the elements.

If you are going after gold nuggets in gold territory, get the Scorpion. It does more than just detect gold nuggets - it is adaptable to the mineralized conditions where most gold nuggets are found. And it is at a frequency more amenable to small gold. The 2500 is adjustable only around the base frequency of 7.2 khz, which is a compromise between small low conductive items like gold nuggets and the highly conductive items like coins..

Everyone wants to find gold nuggets the size of their head. But the reality is this: most nuggets are the size of a fingernail, at best, and hunting for them is a very specialized business.

Gold itself is soft and erodes quickly, and the natural forces that place it within our reach wear it down fast... so nuggets tend to be small.
Too, there is fine and placer gold - the kind you pan for - which accounts for a large share of gold found by prospectors.
And where these are found are just the sort of places the Scorpion is designed for.
Finally, gold country is generally raw country, with exposed rock and widely varying ground conditions. It is wholly unlike the manicured cityscape, plowed field, or soft woods many of us are accustomed to.

This is one of those times where the right tool for the job is better than a supposed do-it-all instrument. Such instruments are inevitably a compromise and with gold at $1000+/ounce, well... compromises are not what you want. And consider this, the money spent on a Scorpion will leave you money for other prospecting necessities like food, camping gear and guns.

 

[bearkat4160]

The GTI is a great nugget hunter if you use the stock coil (9.5) or the 4.5" concentric. The 2500 with the stock coil will pick up .1 gram nuggets just like the Scorpions 10x5 DD stock coil will, they are EQUAL in sensitivity with these configurations. BUT. if you put the 10x5 DD coil on the 2500 and compare it to the sensitivity of the Scorpion' DD, the 2500 looses the match. This is due to the Scorpions higher frequency while being used with the 10x5 DD coil. DD's are not as sensitive as a concentric coil unless you pump higher freq's through it. Thus, if you want an great all round detector that will nugget shoot then the GTI 2500 is great for this. If you just want to nugget hunt then the Scorpion or Infinium is best. I have all of them. I nugget hunt EVERY WEEK and use all 3 depending on where I'm going.

The frequency adjust like the other guys said is only adjustable around the 7.2 mark + -. That frequency works very well for nuggets with a concentric coil. (non-DD). If in very hot ground though, the DD is smoother but with the 2500 you will have to find bigger nuggets for it to detect them of you use the DD coil. Also a 10x5 DD coil is only equal to a 7 inch concentric coil in size, which will get a less depth than a 9.5 inch coil. Except is crazy hot ground the DD's excell. The Scorpion is a very light weight machine and fun to use. My opinion it could use a display with target id and some more tones like a low tone for iron. Its a dig it all machine for sure...old school.

Good luck!
Alan

 

[Uncle Willy]

Gold prospecting or nuggetshooting with a detector is a highly specialized field and you have a ways to go yet. You need to learn the machine you have thoroughly and the raw basics of detecting before taking on nuggetshooting which requires a whole new learning curve. You can't just buy a detector and become an electronic prospector. It doesn't work that way..

Detectors with higher operating frequencies are better for gold prospecting as gold, especially small gold ( which is what you will find more of ) respond better to higher operating frequencies. The Scorpion and Infinium fall into this category. The 2500 can be used for nuggetshooting due to its all metal feature which allows one to ground balance and cancell out the high mineralization in ground where gold is usually found. Plus the 2500 can be switched back and forth from one mode to another and although discrimination is not normally recommended when nuggetshooting there are times when it is necessary such as in areas with so much iron trash that a small amount of discrimination becomes necessary.

As for the adjustable frequencies on the Garretts - they have nothing to do with detection performance but are for eliminating cross talk between detectors or outside electrical interference.

Bill

 

[TC-NM]

When your talking about frequency, to put it simply, the frequency has nothing to do with the performance. It's used to eliminate crosstalk between two or more detectors operating close to each other and/or interference from power lines, i.e., EMI. Most detectors (High End) have what they call is "frequency shift". This shifts are in small increments, like for instance in tenths (0.1). The GTI operates at 7.2 KHz. (7200 Hz.). If I recall it has 6 to 8 frequency shifts on the GTI. I think they are 7.208, 7.191, 7.163, 7.109, etc. Don't quote me though. Think of it as your car radio having a digital read-out. When you tune into a station manually you can see the readout in tenths and in the audio you can hear it fade out from one station to the next and Viola! it's locked in another station, you see?

So when you and your buddy are hunting with two GTI's you can manually (with flick of pushing a button), switch up/down the scale (see your video/DVD) you have eliminated crosstalk, you see? 6.0 to 7.2 KHz. to lets say 10 KHz. is an all-around detection freq. That is to say for general hunting purposes. This range of frequency can detect all metals (ferrous/non-ferrous). 3 KHz. is very sensitive to silver and the same holds true that 15 KHz. all the way up to 100 KHz. is very sensitive to gold.

Hope this helps???

TC-NM

 

[gabbyhayes]

The frequencies are as follows:

1...7248 Hz
2...7230
3...7208
4...7191
5...7163
6...7146
7...7126
8...7109

Give or take a hertz or two. Its opposite from what you would expect. The default is 4 about that 7200Hz

 

[gabbyhayes]

Hi John
I'm sure glad I don't have to hunt anywhere behind you. You are extremely successful!
I suspect you don't leave much behind