Mxt nulling

[HuntinDog]

Ok here's a question that I'm not sure I've seen answered.
When you swing the MXT over a target and there is a discriminated out piece of trash that "nulls" out the threshold and The MXT goes silent.
Does the MXT still search while it is running silent?? or should I wait until I have threshold hum to continue?

 

[Elton]

You can for sure keep moving..It only takes a second for detector to recover.. You will however in those seconds not get a new target reading.. That's one of the reasons it's best to grid an area, and criss cross to get maximum coverage from all angles.. A good target might have been nulled out in this small window of time.. but over all you will still hit 99% of the targets that you do not have discriminated out..

 

[HuntinDog]

Thanks,
I don't think that I miss much.... HA
But I do pretty good.
It's just a question that I have been bouncing around in my head for awhile.

HH

 

[srf2112]

Hey Huntin Dog it's funny you mention that. I was working a site that I've been researching for awhile. I had confirmed that the site was holding old coins so I was being very methodical and checking every possible signal. On several occasions when the threshold nulled out I would re-swing over the spot and eventually bring out and isolate a high tone (relic mode) that turned out to be good targets. Many other times it didn't turn out that way but the point is the nulling did cause the machine to not signal on some targets until I refined my sweep angle and arc. I found my best coins ever that day. JMHO
HH
Scott

 

[BJ in Okla.]

That a small DD coil might have an edge over a Con. coil in those trashy places.
What ever coil I am using, I swing from left to right, and then go back over the same ground, from the right back to the left...
Lay some targets out on the ground, bad target, good target, bad target being something disc ed out, and good target, something disc ed in..
Play with this, see how close you can get the targets and pick them up, play with your sweep speed to.Look at how much ground you cover on a fast sweep and then see ig you can pick up a good target in the Null.
When you get a Null, check it from different angles to see if something is hiding there in the Null...
HH...BJ

 

[BarberBill]

I'm thinking that if a piece of iron is being discriminated and the threshold nulls, a good target close to it will be masked the same as any machine running discrimination. The difference, and one I think is worth having, is the nulling of the the threshold alerts the user that there is SOMETHING there giving them the option to dig or not.
BB

 

[JohninNC]

The MXT actually samples coil signals every 1/4 second, so keep the coil moving. I believe it will only null if you hunt in relic mode with the trigger forward. For that reason I personally do not use that method. I mostly hunt in coin and jewelry mode, but relic mode has its place. I have found that if you hear everything you will be able to hear the iron, then hear the good signal or vise-versa depending on how they lay in the soil. Without an MXT you often don't get the fast recovery and cannot hear both signals. I have found a good target close or even touching iron many times using this method. The one I most remember was a bad/good/bad signal on every sweep. I dug down a few inches to find a nice civil war button laying on top of a crushed tin can. This was while using a smaller coil (such as the 5.3) in areas of dense metal objects. Hope this helps.
John

 

[BarberBill]

The MXT Threshold nulls any time the coil passes over a target below the discrimination setting in C&J for sure, haven't tried it in relic. None the less, as I mentioned in my previous post, the nulling indicates a discriminated target leaving it up to the operator to decide whether to retrieve it or not. I'm sure I miss a goody now and then as I set my discrimination to mostly tune out iron and seldom feel it's likely to be worth digging a nulled target in most of the areas I hunt.
BB

 

[coincutter]

I generally hit the null spots in pinpoint mode
Something is always there
Usuallly a well corroded coin
Often as not Canadian pennies which find their way to Colorado
Dirt here is like concrete and runs @83 on my mxt meter
So it's magic that it can see anything at all but it really rocks
Now that I am beginning to understand how it talks to me

 

[RounderRick]

The MXT Threshold nulls any time the coil passes over a target below the discrimination setting in C&J for sure, haven't tried it in relic. None the less, as I mentioned in my previous post, the nulling indicates a discriminated target leaving it up to the operator to decide whether to retrieve it or not. I'm sure I miss a goody now and then as I set my discrimination to mostly tune out iron and seldom feel it's likely to be worth digging a nulled target in most of the areas I hunt.
BB

If I'm not mistaken the threshold works the same in relic or coin mode as far as it nulling or whispers.
The biggest difference is when in c/j mode the whispers of the threshold's sound is so much like the normal c/j tone it's hard to pick them out without constantly looking at the screen.
The relic mode has a high tone and low tone and both sounds diff from the threshold tone so it makes the whispers easier to pick out that's why some says the relic mode has 3 tones.
That's why I prefer relic mode over c/j it's all in what one is comfortable with some says c/j will go a tad deeper while others will argue that relic mode will go deeper I have used both and to be honest I don't see one any better than the other as far as depth goes.

 

[GpSnoopy]

The MXT "nulls" only the audio portion. It's still processing signals and keeps the VDI display updated. One way to check what it's seeing when nulled is to watch the VDI screen, or flip quickly down to relic mode. The Recovery speed is so fast that you should get a high tone in at least one direction if there is a good target next to a rejected one.

I mainly hunt in relic mode, default trigger position, as it does not "null" at all. Call it Mixed Mode as Targets above my DISC setting are high tone, Targets below are low tone, and "Iffy or unknown" targets are given a 3rd "Threshold" tone. I can attest to the MXT seeing targets almost touching each other. In my mode, I'll get a low/high tone one way, high/low tone the other, or if the coil sees both at once, it may be a merged VDI with corresponding tone depending on what target has the strongest signal. Usually a sputtery, bouncy, not well defined signal. That in itself is a clue that something is different as the MXT usually locks on to either good targets or iron trash very well. In fact, that is how I'm finding our crappy modern Canadian steel w/nickle clad coins. They tend to give me a sputtery, bouncy VDI signal and I have been digging a lot of them lately, now.

 

[littletwig]

Good info for this MXT Pro newby. Thanks