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XLT Question

DGGR/NY

New member
When should I use Autotrac Offset? The ground around here routinely reads 90+ DC Phase. Will an AO of +1 help?
 
You can actually try it an see....off set of only 1 may not make that much different..probably hit a little harder on hot rocks...I think that Preset GB's sometimes run in that area to assure of getting the most.... When I hunt with a Tejon or Vaquero, I ground balance them and turn the sensitivity up to where that there is a slight rise in the audio when I approach the ground... Hope this helps... Maybe some of the other guys will jump in and give you a more definitive answer...Have fun and stay warm. Richardntn
 
Though the ground phase reading is not exactly telling you the ground mineral situation it is giving you a clue that you should be using a degree of positive offset. If your after small targets in fairly highly mineralised ground then you need offset and can gain depth and improve discrimination but as Richard pointed out there's always a price to pay in detector adjustment, hot rocks can cause real problems and they need a negative offset.
Best to find a small deep target and try a plus offset. I normally find a setting of one is all thats needed (90-93 ground phase) but its so easy to adjust on the fly I should experiment and see what works best for you.
 
Good evening! The XLT has a lot of adjustment capability, much of which can easily bne missunderstood or misused.

First, let's deal with the DC Phase. It is an interesting feature but, quite frankly, the ground phase reading of the MXT is FAR superior to that of the XLT! I recommend people just ignore that XLT function, leave it off, and not waste time with it. Many people have a difficuclt time getting a 'proper' DC Phase reading, and then find that it can vary quite a bit depending upon how they do the check, while standing at the same spot. Lower mineralizatioon there tha here, too, as my XLT DC-Phase would usually register around 93.4 or 93.7 or so.

Besides, it is only one small part of the equation and isn't a complete summary of the type of ground or degree of challenges you might face.

Next, let's look at GB .. Ground Balance: It is important to have an adequate GB setting so that you can handle the types of terrain you're going to be hunting w/o a lot of false signals. Buit, just what is "adequate?" Another word I more frequently use for an "adequate" GB setting is FUNCTIONAL GB and by that I am referring to one that is slightly positive so as to be helpful w/o being too positive so as to be a hinderance.

Can I explain what I mean by all that? Certainly! A too negative GB for operating in the motion Discriminate mode will cause false signals when the coil is abruptly lifted away from the ground, and also when the coil is swept over a hole or depression.

If you try to PP with a too-negative GB then get a fairly good PP location and cut a plug, you will then get a 'beep' when you sweep over the exposed hole. That false 'beep' causes you to think the target is still there and dig a little (or a lot) deeper!

Finally, one issue talked about in association with 'Ground Balance' is Hot Rock responses. I'd suggest most people haven't got the foggiest idea what a 'Hot Rock' is and/or how it affects their detector and how to deal with it. Actually, there can be 'Hot Roacks' and 'Cold Rocks' but let's not worry about the differences and simply acknowledge that a Hot Rock is any rock or dense mineral body that is out of context with the GB setting.

Personally, the way I prefer to deal with challenging ground is to adjust the GB of any detector I am using so that it is just slightly positive for the WORST ground environment where I am. Once I have set my GB for the worst patch of grund, most mineralized sand or dirt, or some really bad rocks, then I leave it at that setting, or 'Lock' it with my XL Pro, and detect. That way I have more predictable results from hot rocks with both the audio response and display readout.

White's has a very good Autotrac circuit in their detectors, but autotracking circuitry is mainly a tool to help those who do not have an understanding or are comfortable adjusting the Ground Balance.

With the XLT you have an added advantage to be able to adjust how frequently the XLT adjusts. Of all the White's models I have used I prefer the Autotracking circuitry of the MXT. Not only does the MXT have a superior DC Phase function, but I find the autotracking circuitry to be better as well because it is very quick and even if you have it locked it is consantly monitoring ground changes and a momentary flip of the toggle from Lock to Ground and back to Lock will update the autotracked GB setting.

With the XLT, I found the autotracking circuitry created enough 'noise' and busywork for the electronics that I preferred to no use it. Also, because I hunt some really nasty ground, the mineralization changes quite rapidly and can be a pronounced change. When that change is to the negative, I noted I had more false responses and poorer performance.

Personally, I might use Autotrac if I am using a large coil, such as the stock 950, and hunting a large grassy area where there is not any radical ground changes and also not a lot of rusty junk. Most of the time I prefer to leave Autotrac turned 'Off' and rely on my own setting to establish a slightly positive GB.

The Track Offset is a nice feature, but I don't think it sould be used above a setting of +1. I like a +1 setting because it helps when making my initial GB Air/Ground adjustment so as to be a little positive, and that way it is set at the +1 offset in case I decide to turn Autotrac back On.

Qustions about the above? Drop me an E-mail.

MonteVB@comcast.net

Merry Christmas and all the best for a successful 2006!

Monte
 
DC Ground Phase readings are not what alot of folks seem to think they are. In fact, other than just giving the operator a general idea as to the conductive or magnetic bias of the ground, they don't really offer alot of information as to what is actually under the coil in the way of mineralization. It tells us "what", but not "how much", qualitative vs. quantitative analysis if you will. ;) As such, maybe a little too much emphasis is put on one machine "doing it" better than the other, while "IT" isn't necessarily all that important unless there is a specific need for that particular information. I think the MXT's greater DC Phase resolution capabilities are pretty much restricted in their field use to such things as measuring out black sand pockets in prospecting work, or simply understanding which kind of ground mineralization is most prominent and may need to be dealt with.

As far as Autotrac ground balancing is concerned, there are some definite advantages either way, whether manual or automatic. Manual can give us more control of the machine, but auto-tracking can be much more convenient than constantly having to re-balance in very inconsistent ground conditions, areas where automatic GB has obvious benefits and where SAT/retune may unknowingly be compensating the audio in its place and taking you either into negative or higher positive territory than what you intended. In alot of situations, there is really little or no advantage in either case, as long as both machines are effectively capable of and doing the same thing and holding that level of functionality as you refer to. Granted, many auto-tracking units lack the "capability" of having their ground tracking feature adjusted as to tracking speed, balance point offset, or target-tracking inhibit such as are offered on high-end White's machines, and just those three features (among others) can help make or break a good tracking system. I think there is much more to good auto-tracking circuits than mainly being a tool for those who don't understand or feel comfortable with the basic concept of ground balance. But still, having the option of "fully" automatic OR manual GB would seem to be the best of both worlds.

Just a couple of thoughts......

Ralph
 
Yes, it is true that we can do all manner of creatively interesting things with some of the higher end models from White's, those presently being the XLT & DFX models. But we have limitations just the same.

"The DFX, (as per the printed statement of Mark Rowan, is a Dual Frequency XLT) was conceived as a detector which would maintain most of the popular attributes of the Spectrum XLT, while adding the benefits and capabilities provided by multi-frequency."

I will agree that one of the nice features about the DFX is the quicker 'clock time' so that mode changes occur quickly. Still, the DFX is a moderate to fast motion design, just like the XLT. You can tinker with an adjustment or two or three and make it sort of work like something else, but in the end it is still very similar to the XLT so far as sweep speed is concerned.

The DFX shares search coils with the MXT (and now the Matrix M6) due to the 14.91 kHz operating frequency (the other option is the 2.98 kHz frequency of this dual frequency model). The MXT was designed as a two-filter type, slow-motion discriminator that provides a very quick response. The DFX might have some advantages for an operator due to it's dual frequency design and some of th adjustment functions available, but that doesn't mean it will do the job for everybody.

I have worked with a few different White's Dealers, using their own DFX programs as well as those offered by some White's distributors or dealers of note, and too often the field performance has left them wondering about the merits of selling and/or using a DFX compared with some of the other White's models.

We selected several in-town sites to hunt for older coins, but mainly they were older home sites with yards that were torn up for renovation, or street/sidewalk renovation, or old vacant lots were older homes had been torn down 10-40 years prior and they sort of served as play lots for neighborhood youth.

Through the years I bought three (3) DFX models in order to try and find the right settings to make them serve as "silver shooters" to compete with my friends who clean up on silver coin in the older parks and the like. I was also hoping to find a unit that would serve me well in the torn and dug up renovation work.

What I managed to find was a program set-up for the XLT that came close to the typical settings I use with the 6000 Pro XL, now XL Pro. It doesn't perform exactly the same, but it comes fairly close. I like the XLT but prefer knobs or other routes for quicker adjustments with less scrolling.

The interesting thing I found about the DFX, as have some of those avid detectorist/dealers I've hunted with, is that while the DFX is an improved & modified XLT of sorts, they can't really get performance similar to the XL Pro. Also, they had difficulty trying to match the XLT's adjustment potential.

With the MXT out I got one because I like the knob adjustment, but I still hoped I could tailor the DFX to hunt like the MXT but have the quieter threshold. I was not able to set my second DFX up to operate similar to the MXT. It's just 'different' by design.

I also have been unable, with all three of them, to duplicate the performance I have with the XL Pro, and it definitely can't be tailored to come close to the performance of my modified IDX Pro regardless of the filtering and other adjustments it has.

As for the DC Phase function, I agree. It isn't going to be all that accurate in reporting "how much" of a particular type of ground there is to deal with, but I still feel the MXT's ground reading is superior to the XLT and DFX.

As for autotracking circuitry, there are things I like about it and things I don't, and in this last six months now White's has provided autotracking circuitry in the DFX, XLT, MXT, XL Pro and new Matrix M6, yet no two of them function alike. Still, I have found that by using top quality headphones and listening very closely to most of these models when hunting in trash infested sites, and depending upon the settings, you can actually hear the electronics turning off and on (those with Track Inhibit) or hear slight hesitations during the electronic processing of the ground signal to adjust the GB.

One such littered site I used to develop a like or dislike for autotracking was a fairground where we held a competition hunt back in '98 and '99 and '2000. It was recently plowed and the apparent loose, turned over dirt was appealing to use as the site to plant the various hunt fields for this two-day event. No time to survey the site as we had to get things staked and roped off and planted quickly!

Unfortunately, for some at least, this particular part of the fairgrounds had been used for many years in the past as a dump site of some sort. Mostly iron-based junk but an ample supply of clipped copper tubing and small non-ferrous junk in the mix. It was especially the iron trash, however, that caused the biggest frustrations for the majority of hunters. Many using a Shadow X2, Tesoro Silver Sabre
 
Hi Monte,

>>>".....I was not able to set my second DFX up to operate similar to the MXT. It's just 'different' by design......"

I think this is exactly where alot of people miss the boat when comparing different machines.....the simple fact that they ARE DIFFERENT. The DFX for instance, even with its vast range of tuning possibilities, is going to ultimately perform only as good as its underlying design capabilities, and no better, no matter how it is "tuned". But the same applies to all machines. It's always back to "apples and oranges" analogy it seems. :) The MXT seems to have higher gain ability by design, something that might be explained by its basis being in the GMT circuitry. Too many times it seems that a "computerized" detector should be able to do this or do that, when in fact, the microprocessors only control the base capabilities of the design. A good analogy might be a modern computer-controlled car engine. The computer controls the basic capabilities of the engine, it doesn't add what isn't there to begin with.

Ralph
 
because a few (especially one) dealer or other forum semi-regular poster was making comments about how wonderful the DFX was and how it could match or better the MXT.

My reply, on a forum and direct E-mail, was just as we both know .... different detectors = different overall capabilities. Try as I could, and so did some others, you can't get MXT performance out of the DFX, even by basing the programming on the 15
 
Thanks Monte,

I haven't bought the DFX yet, still giving the Xterra a run for it's money. Mike Hillis just got his hands on one of the final versions (first production run) Teknetic T-2 units and I'm interested to hear what he thinks of that one before I go the DFX route. It has some interesting features, including a single "button menu" that prompts the different tuning functions on a single screen which are in turn adjusted via a single tuning knob. Neat concept. And being one of Dave Johnson's designs, I expect it will most likely be one of his quicker response 2 filter machines. Will be interesting to see if construction quality and performance are anything special at the price point.

One of the current distractors to some of these expensive, top-end machines is the pathetic warranty coverage being offered by some of these companies. BIG DIFFERENCE between "lifetime" and 2 year guarantees IMO. Tesoro has been offering a lifetime warranty for years, Fisher is now also in the act, as is Troy Custom. I can't help thinking at times that warranty coverage tells alot about the manufacturer's confidence in their product, especially when the customer is paying well for what should consist of better warranty coverage in addition to the customer service. Where White's is concerned, the only real "issue" I've ever experienced with them was a couple of bad coils, but considering their overall track record, still don't understand their reluctance to offer a better warranty. I mean, give me a break. Even Bounty Hunter offers a 5 year warranty period. What kind of message is THAT sending ? When considering a new machine, I go in with the expectation of keeping it for a long time IF it offers the kind of performance I expect of it. A better warranty period would just add to those "expectations" in a more positive way. (excuse the pet peeve rant :) )

Interesting observations between the DFX and MXT in your area. Where the DFX is concerned, I would think it natural to find it a more difficult machine in more difficult soils, considering the range of tuning options and getting them all "in sync" to handle the situation. I keep getting mixed messages toward the DFX from different past and present users, with the consensus being "well, it will only accurately ID a coin to 8 or 9 inches max." OKAY. So how many ID machines are there on the market that will accurately ID a coin......consistently......at greater depths ? Any ideas ?

So many machines, and so little time....... :lol:

Thanks for the input, appreciated as always.

Ralph
 
Thanks for the replies, I've been detecting for only 1 1/2 years and the xlt is the only detector I have used. Monte, you're right, DC Phase isnt accurate at all. I do think that an AO of +1 might help, I'll give it a shot. The ground thawed, so I might get some winter digs in :)
 
I do know Whites is working on a DFX with the ground-trax of the MXT. If you still want to keep the MXT simple, add the non-motion mode of the Spectrum series, tones, and normalize off as an option. Simple, yet powerful. What the hell, throw in 3kHz OR 15kHz, as options.
 
Maybe under more ideal conditions.
 
...when I said the DFX would naturally be a more difficult machine in more difficult ground conditions. I would suspect this is why we are always hearing mixed reviews on the DFX from different parts of he country. In some areas they seem to excel, while in others they are "not so hot"...... good ground vs. "not so good" ground ?

Ralph
 
n/t
 
XLT or MXT or you name it, still will NOT give an accurate or close-to-accurate Target ID on coins as deep as the Minelab Explorer XS or Explorer II.

That has been, and is, the goal when 'silver shooting' with any make or model around here. To try and find something more comfortable that will hunt up those silver's as deep or deeper than the Explorer ... matching or bettering the Explorer's TID.

Monte
 
I personally leave it at the Default. +1 in some cases will add a little ground reactivity to the signal of the target. -1 can cause just more reactivity to the point of making it hard to distinguish a Deep Target from the Constant Chattering.
 
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