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Hi Ronnie, I don't have any of the technical info on the GMT, so I don't know if there is a way of changing tone. Reg

Now, for the SL you can mount a 3 pack inside one of the factory battery tray housings. You will have to cut away some plastic and not use the bottom slide in flat but is works fine. It is tight and I slide a thin piece of ABS sheet (.010) under the battery housing for protection and insulation...

A simple and cheap battery pack for the TDI or even the SL can be purchased from the US for less than $40 USD plus shipping which is less than $30 USD. This is for a 4 cell TDI or a 3 cell SL setup. You will have to add your own connection. Also, make sure to buy a li ion charger if you don't...

Davent, There is no specific size of gold that is always a high tone or a low tone. Now, with that said, it helps to know the gold in the area you will be hunting. Very pure gold that is solid has a tendency of being a high tone if it is 1/4 oz or less in size and larger gold is a low tone...

The question of whether the TDI Pro will be discontinued is simple. Yes, it will be discontinued if new dramatic updates are not added. Think about it, all models become obsolete by new designs and that will happen to the TDI. The original TDI model is already discontinued, so only the Pro...

This GB adjustment is not difficult to understand but I do need to clarify that from the onset, I recommended any SPP owner to add the high/low conductivity switch. With that switch life becomes easier to understand because signals can be separated. Now, with that said, when you adjust the GB...

John, I am not disputing what Bob says works because it does, but if you have the SPP and no delay control, then, I say use what works on it. Personally, I prefer my choice of moving the GB even when using my SL or TDI. Many years ago, way before the TDI or GS 5, I used this simple technique of...

You can't use a single or even a couple of sizes of targets to determine how the delay affects the results. Since gold can come in all sizes and characteristics, there will be plenty of gold that will clearly display a noticeable depth loss with a delay change of a usec or two. There is no...

People, You are forgetting one thing and that is, if you advance the delay, you will also lose depth or at least reduce signals from small gold. So, all is not perfect if you have a delay control. On the SPP, one should use the GB sparingly when the basalt is not a major problem. However, in...

What makes you think they fixed the Pro??? Reg

First, I need to mention a couple of things with one being a folded mono should get a little more depth than a plain mono of the same size. Why? Well, the answer lies in the fact the folded mono is a larger coil folded into a smaller coil. Thus, the extra field should enhance what is there...

Digger Bob mentions a couple of things. First, he mentions the bounce back which can happen in really bad ground. Well, this happens only in a couple of areas and his back yard is one of those areas. Also, I modified a SPP and sent it to him at the request of Jimmy Sierra. Digger was amazed on...

You are mixing apples and prunes. In the video I mentioned, the hot pocket was cancelled using the GB control and when done, he could still detect small gold. Now, Much of the basalt will ground balance out at the same setting as a hotpocket, but some will need a little more GB. That little...

Here is another bit of wisdom to add to the book of knowledge when using the TDI or SL series. Know the gold in the area where you are hunting and pick the mode that will work best. By knowing the gold, I mean, know the most common size and then know the purity of the gold when possible. Why...

"The autotune circuitry limits the size of coil that works best. " Now, this doesn't mean large coils won't work. In fact, Jimmy Sierra sells one that is a 20" coil for those of you interested in large coils. Also, I was told it will work on the SPP. http://jimmysierra.com/sierragrandeloop.html...

There are three different circuits that each has an effect that could be changed, depending upon what a person intends to do with the detector. Each one of these circuits have filter capacitors that could be changed. The problem with change is, for every action there is a reaction. So, when...

Mbasko, Your link to a post made by "Jason" is not really accurate in what he says. The TDI doesn't work well with coils larger than 16" but the reason is the filtering characteristics. Keep in mind, it wasn't made to operate with larger coils. The fact is, the TDI has more than enough power...

Here is a little bit of wisdom when using any TDI series detector. If you are beach hunting and you turn the GB off, the only tones that will be generated are high tones. So, to heart any signal, you need to be in low conductor or All mode. If you select High conductor, you will hear a steady...

Hi Roscoe, Don't expect much in the line of posts or responding to emails for a while. I am still trying to deal with the fact I had to put down one of my dogs. She was almost 17 years old and my close companion for most of that time. Losing her is much like losing a child you raised for so...

I am not sure what the problem or worry is in this thread. If a person feels they can live with how their detector works now, then fine, there is no need to make a change. Since I never have hunted in OZ, I can only go by what many people have said and that is what prompted me to come up with...