[x] Welcome at THunting.com!

A fun place to talk about Metal Detecting, Treasure Hunting & Prospecting. Here you can share finds and experience with thousands of members from all over the world

Join us and Register Now - Its FREE & EASY

THunting.com
Treasure Hunting & Metal Detecting Community
   
Advanced Search
*
Welcome, Guest! Please login or register HERE - It is FREE and easy.
Only registered users can post and view images on our message boards.
Did you miss your activation email?

Login with email, password and session length
Or Login Using Social Network Account
News:
Pages:  1 2 3   Go Down
Print
Share this topic on FacebookShare this topic on Del.icio.usShare this topic on DiggShare this topic on RedditShare this topic on Twitter
Tags:
0 Members and 1 Guest are viewing this topic.
Offline tragacTopic starter
Copper Member
*

Join Date: Jun, 2015
Thank you2

Activity
0%
Posts: 32
Referrals: 0

195.00 Gold
View Inventory
Linux
Linux
Chrome 42.0.2311.111
Chrome 42.0.2311.111

Awards

sniffer , V3i
« Reply #10 on: August 11, 2015, 02:07:40 pm »
Go Up Go Down

RR

please do not write these s..... words
I was asking if someone on forum know  more about this md or have already used....and reason is very simple acceptable price and it is simple for ordering....

sorry about my words but it is not correct


Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300014.html#msg300014




Logged
Offline Ridge Runner
Mod
Platin Member
*****

Join Date: Jul, 2010
Thank you311

Activity
0%
Male
Posts: 7429
Referrals: 0

27430.00 Gold
View Inventory
Windows 7/Server 2008 R2
Windows 7/Server 2008 R2
Mozilla compatible
Mozilla compatible

Awards
« Reply #11 on: August 11, 2015, 02:40:47 pm »
Go Up Go Down

Quote:Posted by tragac
RR

please do not write these s..... words
I was asking if someone on forum know  more about this md or have already used....and reason is very simple acceptable price and it is simple for ordering....

sorry about my words but it is not correct



Mate, each time your posts go in a new Direction and it is getting very confusing in trying to help you because what you seem to want keeps changing and each time that happens we keep having to start Again, I don't mind as long as we understand what you are trying to do because if we don't know it makes our Answers useless to you,ok Great

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300016.html#msg300016




« Last Edit: August 11, 2015, 02:41:57 pm by Ridge Runner »
Logged
Offline shaneletts
Pull Tab
*

Join Date: Mar, 2013
Thank you0

Activity
0%

United Kingdom
Posts: 5
Referrals: 0

25.00 Gold
View Inventory
Windows NT 6.3
Windows NT 6.3
Chrome 46.0.2478.0
Chrome 46.0.2478.0

Awards
« Reply #12 on: August 11, 2015, 02:50:28 pm »
Go Up Go Down

The switch is a rotary encoder type

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300017.html#msg300017




Logged
Offline tragacTopic starter
Copper Member
*

Join Date: Jun, 2015
Thank you2

Activity
0%
Posts: 32
Referrals: 0

195.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Chrome 44.0.2403.130
Chrome 44.0.2403.130

Awards

sniffer , V3i
« Reply #13 on: August 12, 2015, 02:55:55 am »
Go Up Go Down

RR

It is multi function Knob , you can search on youtube to see .....

 

You are not allowed to view links.
Please Register or Login

http://www.youtube.com/results?search_query=vandal+pulse+3+



How on earth do you control a PI machine with just One Knob and one push pad,, which must mean that it is all Automatic unless it has a fixed ground balance, the tune knob must be for adjusting the frequency to tune out EMI,



Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300028.html#msg300028




Logged
Offline shaneletts
Pull Tab
*

Join Date: Mar, 2013
Thank you0

Activity
0%

United Kingdom
Posts: 5
Referrals: 0

25.00 Gold
View Inventory
Windows NT 6.3
Windows NT 6.3
Chrome 46.0.2478.0
Chrome 46.0.2478.0

Awards
« Reply #14 on: August 12, 2015, 07:35:44 am »
Go Up Go Down

A rotary encoder switch Crazy


Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300033.html#msg300033




Logged
Offline Lord Dracon
Bronze Member
*

Join Date: Apr, 2011
Thank you7

Activity
0%
Male
United Kingdom
Posts: 224
Referrals: 0

1145.00 Gold
View Inventory
Linux
Linux
Chrome 44.0.2403.133
Chrome 44.0.2403.133

Awards

Dario MD-3006SS VLF
« Reply #15 on: August 12, 2015, 12:16:09 pm »
Go Up Go Down

Watched the vids for this on YouTube. This machine does not seem to "discriminate" that well, as at one point it did not read the Guys gold ring properly ...it registered as iron. also supposed to have 2 tones.. yet in one video I heard 3 Undecided. This seems to be another BS discriminating detector with a 'muti point sampling filter'.  Thumbs Down

Unfortunately a PI will always fail as a discriminator  No no! No no! due to the properties of iron. If you have a mixed ground with both ferrous and non ferrous targets/mineralisation it will always read the ferrous targets over the non ferrous due to the longer pulse flyback signal (emf decay curve, caused by the stored inductance in the target and the rate of release of this energy). gold = sub 10us, Iron = anything, including and above this depending on its size & shape.
E.g. If you have iron next to gold in the same sweep, the overlap of the decay curve of the iron will mask that of the gold. That is why this form of metal detector is poor on heavily mineraised ground and good for beaches and uniformly mineralised ground where there is a clear difference between ground and your target..

To help with filtering out ferrous in the search for gold items on 'clean' ground with a PI machine you would need to have a fast coil able to handle reading the sub 10us decay curve,  a fast enough chipset to compare several sample points to ensure that the decay curve lasts less than 15 - 45us (adjustable, the faster the better) and has a smooth and uniform decay curve of the right shape. Then, when only all the parameters are true it should then return a signal. But beware, by doing this you could sacrifice sensitivity/depth and there is still the chance that it will detect small iron and other non ferrous items, so you might as well take the machine for what it is and just dig everything.

If you want true discrimination go for a VLF machine, it might not search quite as deep on small objects, but it will give you a better idea of your target. But with any machine there are positives and negatives to take into account.

I just wish people would not just 'Research' by reading a few books and watching a few videos made by people who don't fully understand what they are talking about. Research is about discovering and understanding what is happening. For example, a true understanding of what happens when different minerals or a combination of minerals are introduced into an EMF field and what feedback is given in each scenario, as compared to a control environment. - this is where people are doing air tests, and seeing what happens when different minerals are passed across the coil  Clapp and not just stopping at passing a coin across the coil then reacting with "oh it goes beep therefore it must work and I'll be able to find my fortune in gold... it does not work that way!! No no!. The question that should be asked is 'why does it go beep and what parameters are necessary for it to do this and are there different results for each type of mineral.

Now go home and do your homework!

(I might repost some of this on a separate thread re PI detectors and discrimination - what do you think - Mods? thanks LD)

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300039.html#msg300039




Logged

Keep searching ... you might just find it.

Happy Hunting Detecting

Offline Homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you654

Activity
0%
Male
United States
Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory
Windows NT 6.3
Windows NT 6.3
Firefox 39.0
Firefox 39.0

Awards
« Reply #16 on: August 12, 2015, 02:21:46 pm »
Go Up Go Down

   Contrary.   PI machines work quite well in mineralised Ground if the Ground signal is subtracted from the Target signal.   This is what gives them the LEG UP on VLF machines.  

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300044.html#msg300044




« Last Edit: August 12, 2015, 05:09:20 pm by homefire »
Logged
Offline Lord Dracon
Bronze Member
*

Join Date: Apr, 2011
Thank you7

Activity
0%
Male
United Kingdom
Posts: 224
Referrals: 0

1145.00 Gold
View Inventory
Linux
Linux
Chrome 44.0.2403.133
Chrome 44.0.2403.133

Awards

Dario MD-3006SS VLF
« Reply #17 on: August 12, 2015, 03:05:28 pm »
Go Up Go Down

how does a PI machine ground balance?  do you have a link to this info?


Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300048.html#msg300048




Logged

Keep searching ... you might just find it.

Happy Hunting Detecting

Offline GoldDigger1950
The Old Man and the Soil
Global Moderator
Platin Member
*****

Just call me GD.
The Old Man and the Soil
Join Date: Jun, 2009
Thank you214

Activity
4%
Male
United States
Posts: 11204
Referrals: 12

47758.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 39.0
Firefox 39.0

Awards

Garrett Groundhog ADS, Garrett Sea Hunter, Bounty Hunter Tracker IV, Bounty Hunter Pioneer 505,Minelab Eldorado Mk II, Tesoro Compadre, Tesoro Tiger Shark & A Few Home Brew Detectors
« Reply #18 on: August 12, 2015, 04:49:22 pm »
Go Up Go Down

Quote:Posted by Lord Dracon
how does a PI machine ground balance?  do you have a link to this info?


It doesn't "ground balance" in the traditional sense. It does so because it never sees the ground no matter what it is composed of. It sends out a pulse which "charges" the surface of metals with an eddy current that is far greater than that developed by a VLF/TR and that is because of the pulse polarization. Then the coil "reads" the strength of those currents.

There are about a dozen good books out there on the subject or you can visit the USPTO (United States Patent and Trademark Office) and look up some patents on the subject.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300052.html#msg300052




Logged

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.
Let's Talk Treasure!

Offline Homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you654

Activity
0%
Male
United States
Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory
Windows NT 6.3
Windows NT 6.3
Firefox 39.0
Firefox 39.0

Awards
« Reply #19 on: August 12, 2015, 05:24:29 pm »
Go Up Go Down

    Here is a good Read for you.   

You are not allowed to view links.
Please Register or Login

http://www.deeptech-bg.com/Understanding_The_PI_Detector.htm


Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60727.msg300053.html#msg300053




Logged
Print
Pages:  1 2 3   Go Up
Jump to:  

Powered by SMF 1.1.19 | SMF © 2005, Simple Machines | Sitemap
Copyright THunting.com