Friday, October 17, 2014

10/17/14 Report - U.S. One Dollar Gold Coin Find. Pulse Induction Metal Detector Discrimination. Bump In Surf Predicted.

Written by the TreasureGuide for the exclusive use of

Nicely Mounted One Dollar US Gold Coin Metal Detector Find
I heard some guys discussing discrimination.  That is one of two big obsessions in the metal detecting community.  The other is depth.

Anyhow, the discussion centered on the hope for some type of effective discrimination for pulse induction detectors. 

Pulse induction detectors do have a type of discrimination.  You can discriminate with a pulse induction detector, but the results might not be exactly what you wanted.

What people really want is for the detector to tell them exactly what they are detecting before they dig it up.

One way you can get a type of discrimination with a pulse induction detector is to use "pulse delay." 

If you use the Whites Dual Field PI, for example, you'll find that you can discriminate out beer bottle caps and some other junk by using the pulse delay setting.

Just as an example, if you turn the Whites PI pulse delay setting up about half way, most beer bottle caps will be discriminated out.  As you increase the delay from 0 the signal from the bottle cap will decrease until you get no signal, which happens just before the straight up position.  A dime or other coin will still cause a good strong signal well after the setting which causes the bottle cap to be discriminated.

There you have it.  Discrimination with a PI - at least for some items.

But here is the bad news.  A thin gold ring will normally quit causing a signal at a much lower pulse delay setting.  You only have to turn the delay up about one eight of the way for a thin gold ring to be discriminated out.  And increasing the pulse delay will cause depth to be decreased for the same gold ring even before it is discriminated out.

(In a previous post I told you how important the threshold level is when using a pulse induction detector to detect gold and other items.)

It is easy to tell the difference between the signal from items such as a thin gold ring and a beer bottle cap  with a pulse induction metal detector such as the Whites Dual Field.  To produce a signal like a thin gold ring, the typical bottle cap would have to be buried deeply, and that is seldom the case.

The problem with discrimination with any metal detector, not just pulse induction detectors, is that there is risk involved.  You risk missing good stuff when you use discrimination.  Some detectors reduce that risk more than others, but there is risk.

If you must discriminate, there are things that will help you reduce that risk.  One of those things is knowledge of how your detector responds to different items.  Another is knowledge of how things are distributed in the type of area you are hunting.  For me that is by far the most important and effective.

If you want to find coins with a pulse induction detector and want to avoid the bottle caps, turning the pulse delay up is fine (to a point) but be aware that you will lose depth on the coins too.  For me, I'd rather find the gold rings.

Some other day I'll try to explain why I don't care as much about either discrimination or depth as  much as a lot of people.   That will take a number of posts, and I'd have to write a entire book to explain it well.


Above is another example of a mounted gold coin.  The mounting on this one is very nice.  It has six little diamonds on the pendant. 


Here is a video showing the town that is under Lake Meade.  It makes for some nice diving.


Prehistoric camps have been found in the High Tetons.  I really like Jackson Hole and the Tetons and highly recommend visiting if you get a chance.  Saw my first grizzly bear live in the wilds there.  I was glad he paid me no attention and went on his way.   It is a beautiful place.


Back to the Treasure Coast, I looked at a number of different beaches today.  I didn't see any that looked promising at all.  All those that I visited really looked poor.  I didn't bother to take my detector out until the last one.

I could see some dips in front of the beaches in shallow water.  The waves were hitting hard right at the bottom of the beach on most of the beaches.

Gonzalo is headed towards Bermuda as a strong hurricane.   There is nothing much else out there to watch, however if you look at the surfing web sites you'll see that about a week out they are predicting up to a seven foot surf for the Treasure Coast.  In the past when the predicted a higher surf a week or more in advance, a good percentage of the time it never really happened.  There is a chance though.  It is worth watching.

At least the seasons have changed.  Now we just have to wait a little more.

Happy hunting,