discrimination patterns

[rseasy1]

Please correct me if I'm wrong ! I think read a few different things about (forum threads) running in a certain discrimination mode but then they would run zero notched out ,
Other words like running in a discrimation pattern but then adding everything back in ,Is this wrong or is there an advantage to doing that?
I'm still learning to work my 705 and have read all of Randys things I can find on it.Please forgive my ignorance but still in the phase of learning tips and tricks.

Also when your hunting in a moderatly trashy area such as parks with lots of can slaw and pull tabs what pattern do you use I don't like the all metal in parks or trashy
ares but will run it in fields hopeing to locate me one of them there meteroites.As astronomy is second hobby.
Just to many toys and not enough time and space.

 

[Nock]

I have the x70 and i have rejected all the notches in a pattern, where the detector would not hit on any target, then i accepted a notch by using a coin or accept the notch that the desired target you are looking for , Hope this makes sense.

 

[T.A.L.LasVegas]

I think the advantage is in mode 1, 2, 3 or 4 when you turn off the detector it remembers all settings IE ground balance, noise cancel.

HH
Todd

 

[Old Longhair]

Running in DISC w/nothing rejected IS different from running in AM. Many feel that there is some filtering occurring in DISC mode even with nothing rejected. Theories abound about whether it costs depth or not, and one hypothisis is that it's a detriment where ground minerals cause instability when the limited filtering is applied, requireing lowered SENS, equating to depth loss.

My personal feeling is, that I'd prefer to work in AM and 28 tones. If I feel the need for DISC mode I'm going to disc out something, not just run it wide open. Typically in those situations, I'll disc out either -8 & 48, or -8 through 0 and 48 depending on conditons and targets desired. The null becomes important when in DISC mode, and it's easy to swing too fast. In AM, you learn optimum swing speed. If you're moving too fast, you can't distinguish the different objects that the machine sees and it sounds like someone trying to imtate a catfight on a kaliopie.

 

[BADBAJA]

Also in high trash run as small as coil as possible and LOWER SENSITIVITY. I know it's been beaten to death but it does help a lot.

 

[Old Longhair]

Randy's theory on "Circular Discrimination" found starting on pg.77 of his e-book sheds more light on this subject.

 

[rseasy1]

Running in DISC w/nothing rejected IS different from running in AM. Many feel that there is some filtering occurring in DISC mode even with nothing rejected. Theories abound about whether it costs depth or not, and one hypothisis is that it's a detriment where ground minerals cause instability when the limited filtering is applied, requireing lowered SENS, equating to depth loss.

My personal feeling is, that I'd prefer to work in AM and 28 tones. If I feel the need for DISC mode I'm going to disc out something, not just run it wide open. Typically in those situations, I'll disc out either -8 & 48, or -8 through 0 and 48 depending on conditons and targets desired. The null becomes important when in DISC mode, and it's easy to swing too fast. In AM, you learn optimum swing speed. If you're moving too fast, you can't distinguish the different objects that the machine sees and it sounds like someone trying to imtate a catfight on a kaliopie.

Thanks for the info Old longhair and others,
Some of the areas I hunt around here give auto ground balance numbers anyware from 2-26 is this even right for a given area of ware someone lives.
You stated that there is some filtering occurring in DISC mode even with nothing rejected does this really occur or is this just theory?
I always hunt in the factory preset pattern 4, in all metal this thing would drive a person nuts in the parks but I do use A.M. in the fields.

 

[Old Longhair]

Without knowing which coil you're using, I can't say much about your GB numbers. Assuming that you have the stock MF CC on, it would appear that your gound is fairly tough and a DD coil would be a good idea.
In your parks where the noise is so bad that you can't run in AM? The target separation and improved stability of a DD might easily change that.

On the other subject...
By virtue of being processed by the DISC circuit ranther than bypassing it, the signal is being interpreted differently. It is a bit more than theory, but speciffics are closely guarded secrets of the developers.

 

[Digger]

For what it is worth..... I have a piece of ferrite that I can hit with all three models of X-TERRA using their All Metal modes. But it will not hit with zero discrimination on the 30/305 or the 70/705. It will, however hit at -9 on the 50 and 505. This leads me to believe that the notch segments do not cover the whole range of target values, whereas All Metal does. Since the 50 and 505 have a "lower ferrous" range (going to -9), it suggests the ferrite is beyond the lowest notch segment value of the -4 of the 30/305 or the -8 of the 70/705. With that said, the ONLY target that I've not been able to hit consistently in both zero discrimination and All Metal is that one piece of ferrite. However, I believe I get less "wrap around" effect from deeply buried iron using a Pattern with zero discrimination, compared to All Metal (for the reason described above). JMHO HH Randy

 

[Old Longhair]

Today I witnessed Randy's theory on Circular Discrimination personally.

I went out with the Explorer, was hunting in Iron Mask mode, and with the baked dry ground I heard marginally good tones to start with. But, with subsequent passes over the target(s), I watched the TID climb to the top of the scale.....and then it turned to Null.
It was the best illustration that I have ever seen, and I wouldn't have even begun to understand it if I hadn't read the book. Next time out I'll have the 705, and I'll be watching very closly.

Thanks again Digger!