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MXT VDI depth air test specs?
- Thread starter dan93
- Start date
Thats pretty average for an air test. Thats a really bad practice, especially when used as a 'bar' or comparison to another machine because you cannot ground balance and you do not have the conductivity of the ground to assist with the signal of the coil.
You mentioned 'standard coil', are you referring to the stock 950 coil? I think I got about 8.5" when the VDI's barely showed up with my 950 with an air test using a dime. I don't think I've ever dug a dime at an honest 8" but you know how the stories go, if its 5" its every bit of 9". No, that wasn't suppose to sound dirty. LOL
You mentioned 'standard coil', are you referring to the stock 950 coil? I think I got about 8.5" when the VDI's barely showed up with my 950 with an air test using a dime. I don't think I've ever dug a dime at an honest 8" but you know how the stories go, if its 5" its every bit of 9". No, that wasn't suppose to sound dirty. LOL
If you watch this video and SKIP to 2:33 he shows 'his' results with several different coils....
[video]http://www.youtube.com/watch?v=jNOs0Uoj7_0[/video]
He is getting between 6.75" with a small 9x6 DD to 9" with a larger 13.5" Excelerator coil. Its interesting to note that a eliptical or DD coil is only as big as the narrowest part of the coil, for example a 6x10 coil is a 6" coil & a 10x12 is a 10" coil. The size of the coil is a ROUGH estimate as to the depth you might expect from that coil, Add upto an INCH to the depth for a slightly more accurate estimate. Some coils are an exeption but only to a small variance. The Excelerator, for its size, seems to fail this estimate but is still the deepest coil he tests. At some point you have to weigh the cost of a large coil such as WEIGHT, LOSS OF ID ABILITY, LESS MINERALIZATION TOLERANCE and INCREASE IN NULLING.
I stress that this is his results because he seems to have an odd technique of sweeping the coin in a very small motion but regardless I suppose it gets similar results. I do know that the MXT is very responsive to really small motions because I use it for woods hunting and in thick brush I can only give it a small wiggle at times and it still works well.
[video]http://www.youtube.com/watch?v=jNOs0Uoj7_0[/video]
He is getting between 6.75" with a small 9x6 DD to 9" with a larger 13.5" Excelerator coil. Its interesting to note that a eliptical or DD coil is only as big as the narrowest part of the coil, for example a 6x10 coil is a 6" coil & a 10x12 is a 10" coil. The size of the coil is a ROUGH estimate as to the depth you might expect from that coil, Add upto an INCH to the depth for a slightly more accurate estimate. Some coils are an exeption but only to a small variance. The Excelerator, for its size, seems to fail this estimate but is still the deepest coil he tests. At some point you have to weigh the cost of a large coil such as WEIGHT, LOSS OF ID ABILITY, LESS MINERALIZATION TOLERANCE and INCREASE IN NULLING.
I stress that this is his results because he seems to have an odd technique of sweeping the coin in a very small motion but regardless I suppose it gets similar results. I do know that the MXT is very responsive to really small motions because I use it for woods hunting and in thick brush I can only give it a small wiggle at times and it still works well.
At the max depth with any VDI's, the VDI's are not accurate at all. They just begin to show up on screen and can range from +10 to +40 or so, just a bit more than a whisper which is what NO VDI's would be called. I seriously doubt many people dig this type of signal as it really doesn't give you much to go on except for what seems to sound like common chatter, especially from an MXT which is known for its noise. I'm sure thats why I havn't ever dug dimes at that depth. Can it detect them that deep? Probably, but it wouldn't sound any different than the pea size ball of rust next to it. When people air test a coil and brag about the 10+ inches they acheive, thats the only time they will detect that target at that depth.....IMHO.
surf n turf
Member
A MXT Pro LTD edition with TX boost, Mmmmmmmmmm Dan93 I think your on to something! 
I owned and used 6, maybe 7, MXT's since their first release, sometimes comparing one beside the other. I noted a few things, such as, with some of them, it seemed to be slightly more chattery less smooth) in the Relic mode compared with the Coin & Jewelry mode. My personal preference has always been to hunt in the C&J Discriminate mode. Not only the audio clarity was compared but depth of detection and TID and VDI read-outs. Again, as a rule, I found both search modes to perform quite similarly.
I have always been pleased with the Target ID and numeric VDI readings from both the MXT and MXT Pro (and similar-performing M6) and the accuracy of the visa read-outs was always dependant upon the coil used, the amount of trash at a site, and the ground mineral make-up. No different than any other make or model of detector, but when I compared the MXT (or M6 and MXT Pro) to other detectors using a same-size of closely-sized search coil, I have found the MXT class models to often provide a little better or more often accurate VDI reading on the deeper, naturally-located coins, trade tokens and smaller artifacts.
That's why I like using the MXT group of detectors in many of the trashier sites I like to hunt, because visual info tends to be more informative. Not always spot-on accurate across the left-to-right and right-to-left sweep of the coil, but more or better ID or decent 'hints' when I am in trashier locations.
Most of the time the 6
I have always been pleased with the Target ID and numeric VDI readings from both the MXT and MXT Pro (and similar-performing M6) and the accuracy of the visa read-outs was always dependant upon the coil used, the amount of trash at a site, and the ground mineral make-up. No different than any other make or model of detector, but when I compared the MXT (or M6 and MXT Pro) to other detectors using a same-size of closely-sized search coil, I have found the MXT class models to often provide a little better or more often accurate VDI reading on the deeper, naturally-located coins, trade tokens and smaller artifacts.
That's why I like using the MXT group of detectors in many of the trashier sites I like to hunt, because visual info tends to be more informative. Not always spot-on accurate across the left-to-right and right-to-left sweep of the coil, but more or better ID or decent 'hints' when I am in trashier locations.
You can't compare "normal" TID and VDI readings unless you describe the search coil used and the Gain setting you use as those can cause differences. Oh, search coil sweep speed ca also improve or degrade the visual and audio response, especially if hunting in bad ground or with a lot of targets, good or bad.dan93 said:
I'll tell you that I use my 12" coil only for cache hunting or covering larger open fields, or when I intentionally go after larger-size target, such as discarded railroad switch-locks near old RR sidings. I seldom rely on TID at all. I use the 950 coil for open areas, such as large sports-fields or plowed fields, etc. In those cases I also hunt at a +3 Gain level at least 95% of the time and the VDI and TID responses can reach to the 7" to 9" depths, again depending upon the ground conditions.dan93 said:
Most of the time the 6