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Xterra 30 depth
- Thread starter tincan302
- Start date
Shenandoah Digger
New member
I don't think the 30 would find a box of quarters at 15 inches. Great little detector, but it won't find anything that the 705 can't.
With a 15" coil in perfect conditions it might come close, but I'm thinking that whatever people it is that you've been listening have been telling you a fish story.
With the 9 in coil on it , they probably meant 15 centimetres "6in"
My 705 will pick up a Pound coin at 11 inches with the 10.5in 7khts coil .
The ET will pick up a Pound at 12in in the right conditions with the pro coil on .
A Pound coin is slightly smaller than the Quarter Dollar and made of Nickel Brass .
My 705 will pick up a Pound coin at 11 inches with the 10.5in 7khts coil .
The ET will pick up a Pound at 12in in the right conditions with the pro coil on .
A Pound coin is slightly smaller than the Quarter Dollar and made of Nickel Brass .
I was only saying they probably meant 15cm instead of 15 in , was not saying that it could not find a coin at 10in.
Everything is dependent on settings and conditions.
Anyway in the better weather in the Summer depth is not as important because most losses are recent as my finds were yesterday
Everything is dependent on settings and conditions.
Anyway in the better weather in the Summer depth is not as important because most losses are recent as my finds were yesterday
I'm scanning a lot with the 15'' coil (7,5KHz) and sometimes i really go deep with the ideal situations like wet soil, no electric interference, mineralization,etc... I am really amazed by the depth. I'm not used to quarters or us curency and there usual depth, here in France, coins can be very deep in forest or prairie but in normal condition i find all my coins in about 7 to 10'', i find some at 15'' but rarely. Lucky also because i don't think i will digging all the time at 15''. The few times they ware coins from the revolution in bronze or bells metal, very thick coins and a good diameter (28mm diameter for 13,27gr).
Now I understand you ...Kinda ... sort of ... cause you said they might have met 15cm . And 15cm equals about 6" so it does sound like you met that never the less . And I'd be surprised if they were impressed by that depth so that's why I questioned your thoughts . I found that a 9" coil can exceed that 9" by one or two inches more in damp soil in some cases , I have no clue about how deep in sand . The old coil rule is diameter size is about the depth the coil will reach so 9" = 9" depth and above average for most coins buried . So I hope we have that misunderstanding resolved ... kinda .. sort of . IMHO , Woodstock
I was only saying they probably meant 15cm instead of 15 in , was not saying that it could not find a coin at 10in.
Everything is dependent on settings and conditions.
Anyway in the better weather in the Summer depth is not as important because most losses are recent as my finds were yesterday[/quote]
I was only saying they probably meant 15cm instead of 15 in , was not saying that it could not find a coin at 10in.
Everything is dependent on settings and conditions.
Anyway in the better weather in the Summer depth is not as important because most losses are recent as my finds were yesterday
[/quote]Only problem with the 9in coil is that its concentric and they search down into the ground in a cone shape or upside down Pyramid so they are not as wide scanning as a DD coil . They are said to be deeper than the DD coil at the centre of the coil , not sure if the coil would have to be the same size ?
Anyway deep or not the Terra is a brilliant machine , a real Terra'ist on the beach finds me loads all the time in the warmer months and even in the colder months . Using it in Prospecting mode can be interesting too.
Anyway deep or not the Terra is a brilliant machine , a real Terra'ist on the beach
finds me loads all the time in the warmer months and even in the colder months . Using it in Prospecting mode can be interesting too.There is absolutely no difference or not much difference in the field depth between the concentric or DD . Like you explained the concentric has a cone shape and covers less area at it's maximum depth or end of the cone and the DD has a shape like a thin blade in the center of the DD . With a concentric you must tighten your sweep pattern while the DD allows a wider sweep . If you can tighten and straighten your sweep pattern enough the concentric will just about match the DD in ground coverage . The method of a tight straight sweep and scrubbing the ground closer will produce excellent results in the field and has been my choice and remain my choice because I truly feel I can find and pin point any target much easier than the method of running the DD to the end of the blade tip and then turning 90 degrees and doing it again hoping to find the target , but I'm old school . If I learned the DD first I'm sure the concentric would be a hassle for me too.
The DD design is not a "new style" and has been around a long time but unfortunately wasn't pushed by the manufactures who opted for the concentric as a standard concentric coil as a standard on their machines.
It wasn't until it was recently re- introduced and has gained popularity and has become a new standard just because it covers more area with a open sweep users now tend to prefer because today's users like to use a wider half circle sweep, at least today's users I've seen do .
And that's why a lot of DD users find stuff left behind , that being said I'm willing to bet after I leave a area or if there was a DD user following behind me that they'd find nothing I left behind because of my style and if they did it would just be lucky for them .
This is off subject but the digital age has changed detectors discrimination capabilities positively mainly because you can "see" the numerical readout and get tones . So Nickels are not being nulled out and your ears don't need to adjust to deciding if it's worth digging just to find a pull tab. So nickels and more gold is found cause the tones and numbers tell all . IMHO , Woodstock
The DD design is not a "new style" and has been around a long time but unfortunately wasn't pushed by the manufactures who opted for the concentric as a standard concentric coil as a standard on their machines.
It wasn't until it was recently re- introduced and has gained popularity and has become a new standard just because it covers more area with a open sweep users now tend to prefer because today's users like to use a wider half circle sweep, at least today's users I've seen do .
And that's why a lot of DD users find stuff left behind , that being said I'm willing to bet after I leave a area or if there was a DD user following behind me that they'd find nothing I left behind because of my style and if they did it would just be lucky for them .
This is off subject but the digital age has changed detectors discrimination capabilities positively mainly because you can "see" the numerical readout and get tones . So Nickels are not being nulled out and your ears don't need to adjust to deciding if it's worth digging just to find a pull tab. So nickels and more gold is found cause the tones and numbers tell all . IMHO , Woodstock
It is true that in the US the concentric coil was standard but here in the UK for a long time the DD coil have been the standard . In the UK the 705 is sold with the 10.5 in coil but I think in US its the 9in coil ?
A lot of the old Fishers were sold with the concentric type too but now all the new ones have DD coil and it seems that way in all main machines . Quite a few of the cheapies though still have concentric coils.
A lot of the old Fishers were sold with the concentric type too but now all the new ones have DD coil and it seems that way in all main machines . Quite a few of the cheapies though still have concentric coils.
That's basically true Nuke but not totally correct . So it's a bit of a stretch saying that Concentric coils are on the cheeps . Minelab's Xterra series ALL have stock Concentric's and $730 tag on the 705 doesn't fall in the cheap range ,and the newest GoFind uses a Mono Coil and they are basically or mostly made as cheepies for new users . Tesoro also has plenty of units and most if not all don't really fit that cheap category either . Even some higher end Whites do as well , some higher end Tek's do too. What has become the "rage" with newer users is now what some believe the standard so you see them on a lot of the new stuff coming out to sway new buyers . Face it ... of the many new DD and others that will follow like the Mono the Concentric is a proven coil that has earned it's place there and is here to stay . IMHO,Woodstock
Woodstock said:
Actually Woodstock, the concentric coils on the xterra 's are deeper, 9" con to 10.5" dd for instance.
The DD coil will only give a tone- hint per-say at 10 inches in conductive ground on a coin, at the centre two inches of that coil and not along the entire blade with. If the coin is at the DD's maximum hit flat spot of two inches centre-coil on that target in that ground, the concentric will hit it deeper with it's cone tip. The DD's outer path travels downward but inward to toward the centre of the coil much like a V or cone. Minus the cone-tip equivalent of a concentric, that's why the DD is shallower than a similar sized concentric.
For true depth coverage a 10.5" DD shouldn't be swung two inches further than it's previous swing. A concentric........ half an inch for true full depth tone-hint coverage.
When it comes to the 6" coils on the XTerra's on nice conductive ground, the mid freq concentric on a 305 is much deeper than the 3khz and 18.75khz coils on any model.
tincan302 said:
The beauty of the XTerra 30 is that it's the best coin cherry-picker out of all 6 XTerra's due to it's amazingly stable Numerical ID.
Even with their pre-set ground balance, or rather at the point that balance was factory set, they are remarkably stable and will only jump one segment on a slanted coin. The only junk dug with them are coin size man-shaped aluminium and thick washers etc. Pulltabs and iron and twist tops/caps will nearly always come with at least 3 numerical jumps.
The 30's will hunt the harshest ironstone dirt to lovely quiet quiet ground with a maximum hit on coinage around 8 to 9 inches. You'll only gain an inch on very moist conductive ground. But not 14 inches!
I'm with you on that argyle1 because I never really experienced much difference if any with a DD . And 14" is a bit of wishful thinking ... then again I've had times when I wished I could actually know the exact depth the object or coin was recovered at . There were times I know I was close to or over 12 inches with even a 8 inch concentric coil in very damp soil ... Woodstock