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celticspikey
April 02, 2020, 02:15:50 PM
 Is there a problem with the font set up. Every things over lapped.
carling2
March 27, 2020, 05:30:45 PM
 Or is that 12 months from now lol
carling2
March 27, 2020, 05:29:44 PM
 I thought that comment was about tectin 😁😁
Dungbeetle
March 16, 2020, 05:41:50 PM
 Nice to see you back, I thought  that  you'd shut  down. 
carling2
March 09, 2020, 10:23:54 AM
 Cheers Paul. Same to you
dragonsbreath(Paul)
March 08, 2020, 07:38:49 PM
 best of luck buddy i love it
carling2
March 08, 2020, 06:28:13 PM
 Thanks mate I'm warming to it  had the nox a week now

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Author Topic: Used modified GPX4500  (Read 573 times)
DEUSDAVE
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« on: February 15, 2020, 06:19:34 PM »

Just acquired a Minelab GPX 4500 with a gain mod added as per the pic , anyone know what this three position L.S.M switch does and what it is , been racking my brains trying to figure out what these settings are with no luck. Any information will be gratefully received .

                       Thanks Deusdave


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Greg
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« Reply #1 on: February 15, 2020, 07:08:13 PM »

It could be a low sensitivity magnetometer, I built one years ago to tow behind the boat to find shipwrecks, it works by using the earths magnetic field ( the mid frequency being 2k) it sends out a pulse and measures how long it takes the protons to re stabilise, think it only works on no ferrous so not sure what it was used for (perhaps Finding anchors or such like on beaches).
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DEUSDAVE
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« Reply #2 on: February 17, 2020, 10:07:53 PM »

Update on my GPX 4500 question found out the Lms switch stands for large small and medium refers to size of gold nuggets you are looking for, I won't be after nuggets just gold and coins on the wet sand beaches unless I sell the machine. Deusdave
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probono
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« Reply #3 on: February 19, 2020, 11:46:10 AM »

Update on my GPX 4500 question found out the Lms switch stands for large small and medium refers to size of gold nuggets you are looking for, I won't be after nuggets just gold and coins on the wet sand beaches unless I sell the machine. Deusdave

I don't know how much these things are at the moment - but let us know how you get on.

I did think about hiring / borrowing one, as I'd like to search the places I found gold hammies to see if there are any more that I missed Smiley
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DEUSDAVE
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« Reply #4 on: February 19, 2020, 01:09:54 PM »

Hi got it up for sale if you interested but not on here yet look at gumtree and preloved sites cheers Deus.
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Greg
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« Reply #5 on: February 19, 2020, 08:19:03 PM »

Update on my GPX 4500 question found out the Lms switch stands for large small and medium refers to size of gold nuggets you are looking for, I won't be after nuggets just gold and coins on the wet sand beaches unless I sell the machine. Deusdave

Did you find a write up or circuit diagram? would be interested to see it, not a lot of logic to the lettering, would think the person that modified it would have used  SML or LMS, it sounds like a sensitivity control, donít understand why a 3 position switch unless itís changing frequency, high for small items, low for large nuggets.
Will be interesting to see how it works in uk, as it sounds like it was modified for Australia gold fields.
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DEUSDAVE
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« Reply #6 on: February 19, 2020, 08:33:09 PM »

Hi the machine was modified by Detector mods in Australia a kind guy called David there gave me all the info and mailed me the instructions on how to use it  in it's modified form , very helpful i have advertised it for sale on other sites may also put on here at some stage if it sells no worries if not i will keep it. cheers Deus
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