Showing posts with label Bell Tone. Show all posts
Showing posts with label Bell Tone. Show all posts

Saturday, August 12, 2017

8/12/17 Report - Detector Signals Produced by Three Different Complex Targets and The Effect of Position.


Written by the TreasureGuide for the exclusive use of treasurebeachesreport.blogspot.com.

Source: nhc.noaa.gov
It looks like the weather shown on the map above will become a cyclone in the next few days, but will probably stay out to sea and go north of us.  At this point I don't expect the Treasure Coast to get much from it.

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I had to correct yesterday's post.  My description of the signals produced by the watches in the video was incorrect.  I described the wrong video.  That must have been confusing.  Sorry about that. I corrected it last night.  If you read that post before I made the corrections, you might want to go back to read it again.

Today I'll describe a third video on detecting watches.  I'm sure some of you will think I've already done too much of that, but I'm illustrating a variety of important points.  There are some things that are very difficult to correctly identify unless you dig them.  It isn't limited to watches.

Complex and irregularly shaped targets are not as easy to identify as coins or rings.  I've also shown in the past that when a ring is buried so that it is standing on end, it will produce a very different signal than the same ring laying flat in the ground. I posted a video on YouTube about two years ago that shows that.  The position of a watch will affect the signal too.  The signal is more unpredictable due to the irregular shape of watches, the variety of materials that can be used in a watch, how the watch is laying, as well as how the detector is used.

In the next video I used the same three watches and put them on the ground so that the face is facing up instead of being perpendicular to the ground as they were in the previous two videos.

Here is the link for that video.

https://youtu.be/lqZ9XJiKy7o

You probably noticed that the first watch (Polo Club) produced mostly a low tone signal.

The second watch was very inconsistent: sometimes producing no signal, sometimes a Bell tone and sometimes a lower tone signal.

The third watch ( large high-end Seiko ) consistently produced a Bell Tone, no matter which direction the coil was moved.  The ID meter gave a meter ID that was in the coin range.

The lower tone (produced by both the first watch and sometimes by the second watch) was accompanied reading of something between a pull tab and penny on the ID meter.

If you were only digging targets that produced the Bell Tone, you would have dug the third watch, maybe dug the second watch, but probably left the first watch in the ground.

Target ID is not always simple.  Of course different detectors give you more or less information, but no metal detector can identify everything correctly, and as a result you can easily miss something very good.  It is important to really know your detector and how it responds to different types of targets.

Targets such as coins are easier to identify than complex or irregularly shaped targets such as watches.  You can often get more information about a buried target by changing the angle of your sweep and comparing the signals obtained by sweeping in two different directions.

One thing I hope you see is that there are some very good targets that might not sound good or read as good on a meter.  At helps to really get to know your detector.  I highly stress the value of experimenting with test targets.  Most targets will not be as complex as watches, however they might be more complex than you think.  Various things, even those as simple and common as coins, can give signals different from what you might expect.

For example, coins sometimes seem to disappear when you are digging.  They can slip deeper into a hole or  stick to the side of the hole.  A coin sticking to the side of a hole so that it presents the narrow edge of the coin to the coil will be much more difficult to detect and can seem to disappear.

As you probably know, I do a lot of different kinds of posts on a variety of topics.  I'll undoubtedly be back on some other topic before long.

I hope you find the videos useful.

Happy hunting,
TreasureGuide@comcast.net

Friday, August 11, 2017

8/11/17 Report - More on Metal Detecting Watches and All Metals Mode. Sedwick Treasure Auction. Numismatic and Shipwreck Salvage Presentations.


Written by the TreasureGuide for the exclusive use of treasurebeachesreport.blogspot.com.

Two Areas of Weather That Might Affect the Treasure Coast
Source; nhc.noaa.gov
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Yesterday I showed how one metal detector responds to watches.  I used the inexpensive Garrett Ace 250 for my demonstration.  I could have used a variety of other metal detectors and got very similar responses.  I might  actually do that some time.  Of course different detectors will respond somewhat differently, but the main point remains the same: how you use your detector will determine what you find or don't find.  As I am showing, it is easy to miss potentially valuable targets such as watches if you are not careful.  I've often warned of the risks involved with various forms of discrimination and too much reliance on target ID as well as other detector settings such as search modes that might seem convenient.  You can miss very good targets and never be aware of it.

Yesterday for my demonstration I used the Ace 150 in Coin Mode.  As you saw, there were times when the detector completely missed or responded minimally to large men's watches.  But what if you were not using such a selective mode?  I'll show you what happened when I switched to All Metals mode.

I used the same watches placed in very similar positions.  Also the same detector.  The only difference is that I switched to All Metals mode.

Here is the video link.

https://youtu.be/BtIVumXmtyU

[ I corrected the following three or four paragraphs.  My original text was incorrect.  Sorry! ]

There are are basically two tones that you heard.  One is the Bell Tone that is used by the Ace to indicate a coin or similar good target.  The other tone is lower.

The signal produced by the various watches varied depending upon the direction the coil was moved.  That happens with a lot of targets, especially those that are elongated like nails or spikes.

The signal produced by the last watch ( the heavy high-end Seiko ) was the most consistent.  It produced a definite signal almost all the time, no matter if the coil was moved parallel or perpendicular to the face of the watch.  In one direction, though, the signal was a Bell Tone, and in the other direction is was the lower tone.

The first two watches often produced no signal, which you might find very surprising, especially since it was made using All Metals mode.

The main point is that with complex targets such as watches, the signal will vary depending upon a variety of factors, including how the coil goes over it.  Changing the direction pf the sweep or position of the coil by a few inches one way or another, often resulted in a very different response. That makes target ID for such targets very tricky.

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Below is a notice I received from the Sedwick's concerning the upcoming treasure auction.  Even if you aren't participating in the auction, you might want to catch the guest speakers, which are listed at the bottom of this notice.



Sedwick's Treasure, World, U.S. Coin & Paper Money Auction #22

Now is the last chance to consign to our Treasure, World and U.S. Coin & Paper Money Auction #22, which will be our Fifth LIVE PUBLIC FLOOR sale. As usual this event will take place at the DoubleTree by Hilton at Lake Buena Vista in Orlando, FL, with live floor auction on Thursday-Friday, November 2-3, 2017 and lot viewing and guest speakers the day before (Wednesday, November 1).

The final deadline for consignment to our upcoming auction is almost here: August 17. We have secured a vast amount of great pieces but there is always a spot for interesting consignments and trophy coins. Many international guests will be coming from Latin America and Europe, so take advantage of our great LIVE FLOOR event and get top exposure for your pieces.

This auction will feature Part II of The Richard Stuart Collection Selections, which includes the largest group of Panama cobs ever offered in one sale with 10 unique pieces; an impressive assortment of unique and finest pieces from Central America, including Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua (including the largest offering of provisional coinage ever presented in a single auction) and Panama; plus the largest single-sale offering of British "Admiral Vernon" medals from the same pedigree.

Other features in this auction include a selection of Lima gold cobs from the 1715 Fleet (many unique dates and finest known pieces) in addition to many other Fleet treasures like gold chains, ingots and other artifacts. Finally we have hundreds of cobs, particularly Lima and Potosi, and an exquisite collection of Mexican pillar dollars.

Guest Speakers Include:

1) Jorge Proctor, Numismatist and Researcher: "The Forgotten Mine of Colonial Panama"
2) Manuel Chacón, Numismatic Curator: The Central Bank of Costa Rica "Costa Rica Numismatics"
3) Carlos Jara, Numismatist and Researcher: "Central American Provisional And Provincial Mints"
4) Capt. John Brandon, Historical Shipwreck Salvor: “An Overview of the Exploration For and Recovery Of Historical Shipwrecks: 1715 Fleet, Atocha and Lucayan Beach Wrecks”

We look forward to hearing from you, with thanks in advance.

Daniel Frank Sedwick, LLC

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There are now two areas of weather pinpointed on the National Hurricane Center map for our area.  The first will just produce rain.  The other one has been out there for a while and might develop this weekend.  At this time it is expected to stay east of us and possibly make landfall in the Carolinas.  It is too early to say much about how that one might affect us.

On the Treasure Coast we'll be having something like a two foot surf again.

Happy hunting,
TreasureGuide@comcast.net