Notch Question

[hrefab]

Am I reading the manual correctly when I see that the notch function encompasses 6 values? In other words, If I want to notch out 45 I have to notch between 43-47 inclusive? Or some other combination of 6 values? That makes no sense to me.

 

[Listener]

The way I read it u notch out the group of six (3 below and 3 above) the target value u want to reject. So actually 7 values.

 

[hrefab]

Wow, that'a a lot of notching for a target. I could see one above and one below, but 7 numbers is too broad a range. They need to change that in some software update.

 

[Listener]

Notch doesn't affect the vdi just the tones up to the depth the vdi quits showing. Notch is an interesting feature to work with. There are lots of posts about it. I think squirrel1 has the most understanding on it, read what he says about it.

 

[hrefab]

Thanks. Like all new machines (or new to the user), there are going to be peculiarities. That's the learning curve. Reading these forums and getting pointers is a good way to shorten that learning curve and explain some of the 'oddities' about that particular machine.

 

[sprchng]

Am I reading the manual correctly when I see that the notch function encompasses 6 values? In other words, If I want to notch out 45 I have to notch between 43-47 inclusive? Or some other combination of 6 values? That makes no sense to me.

That is a simple default setting. You can refine the size and location of the notch to your hearts delight if you will read page 40 of the manual.

 

[Listener]

Page 40 deals with multi notches where a rejectible target needs a wider window, it does not deviate from the standard six point window. You may lessen the window, but will have little success unless u notch out at the upper end from say 96/97 to 99 to deal with iron foldover which is only a 3-4 point window.
My self I rarely use notch except from 00-20/30 or at the top 97-99.

 

[sprchng]

Clearly you have your own understanding of how the notch/notches feature works,,,,onward through the fog

 

[hrefab]

Clearly you have your own understanding of how the notch/notches feature works,,,,onward through the fog

Rather than a snarky comment, perhaps you could illuminate the discussion with YOUR understanding of the process?

 

[sprchng]

The manual on page 40 is quite clear.
Simply use the controls to set up notches to block out trash at 1 , 2 or 3 different locations of the VDI scale for whatever size/range you feel you need.
And don't for any reason notch out 97 and run in 18 khz

 

[hrefab]

Thank you. I do not as yet have a Deus but have been reading the forums in an attempt to get a sense of the machine. Your input is appreciated.

 

[squirrel1]

As far as notch setting capabilities,,,you do have regular way to set notch-- which is just notching out say a range of 6 numbers,,,,but you can also by way of expert tab go in,,,,here you have far more flexibility.

I have talked about notch in another thread just recently.

I will comment here as well,,for folks who may be interested.

Deus is a fast contraption,,,it will indeed,,has the capability to actually try and provide tone on multiple nonferrous targets in close proximity.

The tone provided overall sounding on targets of mixed conductivity--- doesn't necessarily paint the true picture of just what may be under the coil.

An example,,,take a silver dime and a pull tab.

Now most folks would be thinking old boy,,,if I notch out the tab,,I can just hear dimes and dig to my heart's content. Not quite.

True a person can say notch a tab that air test say 66 out notch wise (( maybe by nothing 63-69)),, and yes it is true tabs reading in this range and mid depth and shallower will not be heard tone wise.

But deeper tabs can actually still be heard--- because they will tend to read higher as depth progresses deeper.
But remember modern trash on average is not as deep as older coins-- usually

But what if we use the notch setting above 63-69,, and bury a tab that air test at 66,, and place a silver dime about an inch away from the tab??? When this setup is swept,,operator will get a tone and a meter reading--- but it sure won't sound like a dime and it sure won't read like a dime.

So what can an operator do,,,to actually single out the dime in the above scenario.

Well,,,when the tab and colacted dime are swept,,,higher I'd than tab will be seen in the meter,,and lower I'd than the dime will be seen in the meter,,,so a blended meter reading,,,,and believe it or not,,,Deus sounds off on both,,but the tone sounds blended,,not helping the operator realize the dime is under their coil.

So if an op will,,,notch out a tad higher than this blended meter reading,,,in the example above tab and dime likely to read around 76 when colocated,,,so notch a few points higher than this 76 combined meter reading.

When you do this,,,the audio the tab makes the Deus produce disappears,,and op hears only the higher conductive dime, audio wise-- nice high tone,,,but doing this notch setting will not change the blended meter reading of 76,,,, so with correct notch,,dime will sound off with good audio,,but with faulty meter reading.

This process will definitely work in sites with a lot of modern trash--- and help a person limit their digging.

And using the notch process as I have stated above-- one note,,dig all chopped signals.

Now a person could when choosing to hunt a site,,,if they decide on a notch setting like above,,,you can hunt the site a few times,,,and later go back and say rehunt and drop your notch a few points say 3,, and rehunt and again dig all good sounding and chopped signals,,,and in the future you may consider rehunting and again reducing your notch and again digs all good signals and the chopped ones.

Remember,,,there is a tug o war that goes on,,,meaning higher and low conductivity targets colocated are fighting for position conductive wise (( what you will see in the meter) blended Vdi...

So a silver dime ID won't for example get pulled down as much as say a zincoln,,,,,so be mindful when selecting your notch setting.

 

[hrefab]

This is different from other machines for sure. I read your explanation several times and I'll read it several more. It starts to make sense when I start to see how the machine is processing the signals. Quite interesting and not as limiting as I had first believed.
Thank you for that great explanation.

 

[squirrel1]

This is different from other machines for sure. I read your explanation several times and I'll read it several more. It starts to make sense when I start to see how the machine is processing the signals. Quite interesting and not as limiting as I had first believed.
Thank you for that great explanation.

I believe if I read correctly you stated you didn't have a Deus yet.

If and when you do get one,,,you will be able to do my test above and see for yourself.

Now running what I call high notch,,,I don't want you to think this is the end all method to find all say coins in a trashy site,,,,for example,,in my example above if the tab is shallower moreso than a deeper dime,,,where the tab is being a blocker of sorts--- tab can win out,,,meaning depending on the depth of the tab,,,you would here it or nothing at all due to high notch setting.

So to get most of the coins in a site--- it would stand to reason a person would have to dig at least some of the junk targets like tabs--- to possibly expose so,e of the good coins the junk targets are masking.

But my original example--- I don't really know just how many other machines can do this--- because it takes both speed and speed of reporting tone,,and also ability to set notch ( not just blocks) of notch as some machines allow.

And also,,running high notch,,Deus is still capable of reaching deeper targets,,even targets that when at shallower and midepths are notched.
Another Deus peculiarity an operator can take advantage of--- and believe it or not some folks actually complain about this characteristic of Deus

One thing is for sure--Me no Deus salesman, the engineers behind Deus deserve a load of credit to bring this little work of art into metal detecting land.

I look forward to seeing just what else Xp can bring to the table with this little monster with version 4:0 and the supposed smaller coil that is in the works.

 

[hrefab]

Again, thank you for the clear explanations. I think that a lot of people (even experienced people) fall under the "Notch Spell" and assume that notching will eliminate any possibility of digging trash... Well I suppose if you carefully notched out every single piece of foil, iron or tab, you MIGHT be able to eliminate a great deal of trash, but what about beer cans? If you notch out THAT particular bugaboo, it's pretty likely that you're not going to hear ANYTHING... So much for the magic elixir of Notch! Now with the 'chopped' signals on the Deus, it's (I am guessing) similar to the tone roll on an ATP or the changed audio on a White's.. Getting to know the sounds it a better method of hunting than solely relying on numbers. Your explanation makes it easier to understand. You're not going to find any gold rings if you don't dig a few pull tabs!