Am I doing something wrong????

[Piero franchi]

Hi, I am new to the terra 70, but not to metal detecting.

I have used the detector 3 times, each time on different sites.
I just cant believe there is that much iron on all three sites to cause the threshold to drop out any were between once to five times for every sweep!!!!!

it is very rare that I do one or two sweeps with out the threshold dropping.

this is in factory pre set, it gets much worst when the sensitivity goes up.

I don't want to run it on low senc, as I can keep turning it down, and it does get better, but then I might as well turn it off!!!!!!!!

There cant be THAT much iron on all three Fields??????

Any help will go a long way

 

[Bavaria Mike]

which is where I run on the farm fields. Today I was getting 2-5 beeps per sweep at -6, mostly iron nails from Ox shoes. I found some awesome finds today but will have to post the finds tomorrow, to tired to post them. The XT70 is a great all around machine, if you notch out something, it will slow down your recovery speed between targets. I listen to it all and the XT70 does well on close targets, it will be a great trashy area machine if ML designs a small coil, I'm hoping for a larger coil as I hunt farm fields. HH, Mike

 

[Digger]

I agree with Mike that the X-70 is a great detector for iron trash laden sites, when you hunt in all-metal mode. If you are in all-metal mode (zero discriminate), you should not hear any loss of threshold tone regardless of the target you pass over. If you are not running all metal, and you are losing the threshold 1 - 5 times per sweep, the detector is telling you that you have swept the coil over a target that you chose to reject. The threshold tone doesn't really drop off. A null tone is actually superimposed over it. (sounds nuts, I know) But, if you give us the other settings you are using, (number of tones, notch patterns, etc) maybe someone can help figure it out. HH Randy

 

[Monte]

method are you using, and is there much change at your sites in the GB setting (GB Reference Number)?

Monte

 

[NH Bob]

This is such a nice working machine I have a suggestion for you.
Pattern #1 knock out -8 -6 and -4 only. Set sensitivity to whats comfortable and be sure to Ground bal. When getting a clear signal check the digital and do what you do as an experienced detectorist.
I think you will find this will solve your problem.
Please let us know how things work out for you.
I am going by the limited info you have posted.

 

[Piero franchi]

Hi, did not want to over load you worth to much info, but in retro, maybe a little more would have been good.

When in run in program1, with factory settings, the threshold nulls SO SO often.

in all metal mode, it gives that low iron tone SO SO often.

Just can believe there is THAT much iron.

It really is any were from 1 to 5 nulls per sweep.

With the sensitivity turned up, like so of you guys do (24 to 26) the nulling is even more.

 

[Digger]

Now that you told us a little bit more about your settings, it sounds like you are hunting some sites that are saturated with ferrous targets. Likely iron. If you run in a discrimination pattern with Pattern 1 as default, you are rejecting ferrous targets that fall within the notches of -8, -6, -4, -2 and +48. When you pass the coil over targets within that range, your X-70 will respond with a nulling out audio. This, in fact, will cover up the threshold tone.

The first thing I would do is to dig up some of those targets to see just what they are. I would be you find them to be bits of iron trash. If it were the type of sites I hunt, I would bet they are small iron nails. And, regardless of how hard it is to believe there is that much trash in one spot, it happens. My suggestion would be to hunt in the all metal mode with more than one tone, and simply ignore the low tone. This will allow the X-Terra to reset more quickly between targets than it does in a discriminatory Pattern mode. HH Randy

 

[Piero franchi]

have to agree, will dig up a few and see what it is that is making all the noise.

little bit of topic, but would any on you guys know, if the terra 30, fitted with its 7.5 coil and a terra 50 with the same 7.5 coil, which would give better results (as to finds)

 

[John LA]

The X30 uses fixed ground balance. The X50 will GB in many (maybe most) places and the X70 will GB in the most places. The X70 has tracking (auto GB adjustment)as well as auto and manual GB. If the GB is not correct depth will suffer.

 

[Piero franchi]

First of, I was not intending on buying a new detector, just a mate wanted either a 30 or 50.

back to topic.
just went to try some settings and as I was doing this, some thing very strange is happening to my detector!!!!!!!!!!!!!

It cant identify the UK, English penny.
it make uncertain tones, and the ID meter jumps up and down.

why is this so, and could it be linked to my other concerns about the threshold tone??????

 

[Jackpine Savage]

Hi Piero,
It is not inconceivable that the UK penny does not "lock on" with a consistent target ID. Target ID appears to have been intended for US coins. I know that trash targets that happen to fall between segments do what you describe. Perhaps the compostion of the UK penny also falls in an area betwen number segments causing what you see? Using fewer tones in areas where you get a lot of broken inbetween responses and go by sound more than the meter.

About the iron nulls. If you are like me and do not want to have to listen to all of the iron low tones simply watch the meter to see which iron number is predominate for that site and notch out the segment for that number. Of course this will still give quite a few nulls and you may have to lower the sensitivity to compensate but not as much as you would if all iron is notched out.

tip.. leave auto tracking on in iron and use 2 tone mode.
If you have to lower the sensitivity in the 14-16 range to eliminate nulls try using the beach GB mode to compensate for the reduced sensitivity.

Tom

 

[Jackpine Savage]

would be considered easy for the type sites I regularly hunt. Try hunting in an almost constant null! See my other post below.

Tom

 

[NH Bob]

"An unbalanced detector in coins and treasure mode will blank continuously if a pattern rejecting -8 us used."

 

[Piero franchi]

This was in an air test.

how would I balance it for that??????? that is a question, not being funny.

It was in coin mode, setting one.

The numbers jump from high 40s to low numbers.

still cant work it out.

will ring minelab.


Just added this.
I have now been told that the English modern penny has a iron center.
that would explain that