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Offline treasuremomoTopic starter
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« on: January 23, 2010, 01:31:04 pm »
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I've owned two PI machines for water hunting and the part that I never cared much about was having to dig up all of the trash targets as I detected. Are there any pulse detectors that can help me recover the coins and gold items without having to recover all those pesky pieces of wire and those darn pull tabs. I'd like to see some sort of Notch Circuitry on a Pulse detector. Is that possible?Huh?Huh?Huh?Huh??

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« Last Edit: January 23, 2010, 01:39:46 pm by treasuremomo » 		Logged
Offline GoldDigger1950
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« Reply #1 on: January 23, 2010, 01:53:29 pm »
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Yes.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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Offline treasuremomoTopic starter
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« Reply #2 on: January 23, 2010, 05:18:33 pm »
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Hey GoldDigger, are there some currently manufactured PI units that have a good working discriminator or Notch circuit and if there are, then what are they?

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Offline GoldDigger1950
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« Reply #3 on: January 24, 2010, 12:38:37 am »
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Quote:Posted by treasuremomo
Hey GoldDigger, are there some currently manufactured PI units that have a good working discriminator or Notch circuit and if there are, then what are they?


I'm getting a clear picture that you have two problems here. One is that you don't believe in what a company says about their detectors and the other is that you cannot figure out how to use Google. Either would get you exactly what you need.

You also seem dead set against any advice you have received to dig every target and not worry about discrimination.

My answer was clear to your question. Yes, it is possible.  Now you want me to do your homework for you? No thanks. Had you just thrown the question out instead of asking me directly, an answer might just get back to you. I cannot spare the time to do your research for you. Sorry.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #4 on: February 06, 2010, 11:12:14 am »
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You  Know   i  just  thought  it  was  me,  but  your  like  this  with  everybody  on  this   forum,  best  thing  to  do  is  when  you  leave  an  answer   don't  answer  it   and  you'll   be  better  off.  Harold  in Fla.

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« Reply #5 on: February 06, 2010, 12:40:51 pm »
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Quote:Posted by treasuremomo
Hey GoldDigger, are there some currently manufactured PI units that have a good working discriminator or Notch circuit and if there are, then what are they?



The Gold Scan detectors by Eric Foster have a rather good Disk and are PI machines.

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Christian

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Offline peabody
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« Reply #6 on: February 06, 2010, 04:11:42 pm »
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The Whites TDI discriminates based on magnetic conductivity.  Low conductivity metals produce a high pitch tone, while high conductivity metals produce a low pitch tone. Here is a link to some YouTube clips that will give you an idea of how it works:

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Whites TDI search on YouTube
.  I do not think the discrimination function on pulse machines do much more than this...

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Offline gambol1
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« Reply #7 on: February 06, 2010, 06:20:32 pm »
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peabody, I went to this link on you tube and not only found the whites demo but also others for the Garrett 250. These tests show basically that depending too heavily on the discrimination function is going to mean you miss a lot of good stuff....You are damned if you dig and damned if you don't. If the machine says it is a pulltab and you dig chances are you will probably find a pull tab rather than a gold ring simply because there are more pull tabs around than there are gold rings. This can give the false impression that all pulltab responses are pulltabs when in fact occasionally one of them is going to be a gold ring and if you don't dig you will miss it.  Idea

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Offline peabody
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« Reply #8 on: February 06, 2010, 07:31:29 pm »
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I do not think any discrimination circuit is perfect.  I have a Whites Gold Master VSAT, which has an iron discriminator function.  I do not trust it, as I have found it is easily fooled by ground mineralization and the condition of the iron trash.  Rusty bits and small pieces of iron, such as flakes, will not show as iron until they are right on the coil.  And rusty flakes from old nails often do not read as iron at all. 

However, my VSAT and the Garrett Ace 250 are both VLF machines.  The pulse machines function differently and are less-effected by ground mineralization.  Using a VLF machine in a park or school yard is one thing - the ground is stable and homogeneous.  Gold bearing soil is another story.  I have heard from many a nugget shooter that if you can find gold with a detector, running a coin or relic machine will be a breeze.  Tiny targets in heavily mineralized soil - it doesnt get tougher than that.

The high-low conductivity discrimination feature on the TDI, and perhaps others such as Minelab, is the only discrimination function I am aware of on a pulse machines at present.  Despite the advances in technology, the old adage still holds true - When in doubt, dig!!!  Wink

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Offline Harold in Fla.
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« Reply #9 on: February 07, 2010, 09:21:31 am »
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Yea  they  all  say  that, when  in  dought  dig  it,  i've  had  a  few  times  were  i  was  thinking   should  i   dig  it   or not,  and   don't  you  think   it  was  something  good,  some   days   when  your   tired  and  you  get  one  of  them  signals   you  say   maybe  another   day  and  then   your  halfway  down   the  field  and  you  say,  Man   i  should  of  dug  that,   because  you  never  now  what  it  is  till   you  dig  it.   Harold

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