Discrimination...

[Dan-Pa.]

Usually run it wide open but will high discrimination cause a depth loss. Very noisy hunting as I do, but would like opinions...

 

[Cody]

I don't see any loss of dept but the same depth as all metal. At the ultra maximum depth the discrimination defaults to iron. We hear a low iron tone because the ID of the target is uncertain.

I think we do get less depth due to the discrimination overall but due to the discrimination process which will cause masking if there are a lot of trash targets. A pulltab that causes a null will mask a deep dime as an example in some instances. However, all metal will cause a loss of depth in that if we get so many hits that we miss the faint deeper target. So both discrimination and all metal will cause a loss of depth in some situations.

The trick to me is to pick the deeper targets out no matter if we prefer all metal or discrimination. All metal is putting up with all the hits and discrimination is dealing with the nulls and missing targets that are good but have the same reading as a trash target.

 

[PULLTABBY]

Would it be wise to remove most of the pull tabs from an area that has given up deepies at 10" + ????? Then check the area immediately or give it time then recheck the area ??? I'm using all metal ..... no discrimination with an XS
If a pull tab can hide a deep coin .... after the pull tabs removal ...(if a coin is there )....would you hear it rite away ???
I'm convinced that part of the park is pretty well picked out with the exception of I never removed any of the pull tab readings.
IDEAS ???

 

[Frank in NH]

n/t

 

[Cody]

You suggestions are, in my opinion, the best way to deal with pulltabs. Discrimination leaves them in the ground but we can slowly remove them as we did in the old days before discrimination. I use to remove hundreds of pop bottle caps around trees just to get to the deeper coins. Pulltabs came on the scene somewhere in the fifties I think. They are not as deep as the old pop bottle caps but none the less will mask coins.

I will work an area that looks good by discrimination and also all metal. I am never completely satisfied that there is nothing there no matter how I search the site. If the site is giving up some goodies then I will start working an area in all metal and remove all pulltabs and strong signals.

Discrimination is a best guess method of detecting. We play the odds.

 

[Frank in NH]

Working a old park has proved to me good old coins are masked by tabs and other junk. Putting on a 5" coil i have found old silver only inches away from junk, and only a couple of inches deep. Like they say swing low and slow!

 

[Bill_in_MA]

Cody with regards to your pull tab reference - thought you might enjoy this bit of historical trivia as we all live with it every time we go detecting......

1865 The can opener was invented
1938 Cliquot Club ginger ale became the first canned soft drink - used a cone top can
1948 Pepsi-Cola became the first major soft drink in cans
1955 The James Vernor Co. introduced its ginger ale in a twelve-ounce flat top can
1955 Dr Pepper introduced cans into a few select cities that same year
1955 Coca-Cola began selling cans to overseas armed services
1958 the first aluminum beer cans were sold
1959 Coca-Cola test marketed cans in five U.S. cities

1959 The ring pull opener was invented by toolmaker Ermal Fraze

1960 Royal Crown was selling the most canned soft drinks
1960 The ring pull proved so easy to use that the cone topped can was retired
1961 Canned soft drinks were first dispensed in vending machines
1963 Reynolds manufactured the first aluminum beverage can for diet cola "Slenderella"
1964 Royal Crown adopted the aluminum can
1967 Pepsi and Coke followed

1975 The first non-detachable tab opener, which most beer cans feature introduced in by the Falls Brewing Company. This important alteration cost a bit more in production but went a long way in reducing litter

1984 Aluminum can so successful the three-piece steel beer can was retired

 

[Cody]

Interesting, I thought pulltabs were in the fifties but not that sure. It use to be foil and pop bottle caps that were a great big problem. A pop bottle cap would cause the meter to dip just before it went positive. A coin did not dip but took off positive. It is interesting how many of the features we see on our detector can be connected to something we saw and did way back with the TR and BFO machines. I find myself often thinking that I have seen that before but it is interesting how they are using tone, discrimination, etc, to enhance or solve those old problems.

 

[Dan-Pa.]

Tabs and foil along with other junk weigh much less than a gold ring it imitates...try it on a jewelers scale and it will shock you as the difference is quite a bit..Taking this into consideration many use audio variances to cut down the odds and depending on the unit some can cut the odds way down....Excellent detector is one thing but that computer between ones ears is where its really at...