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Title: Used modified GPX4500 Post by: DEUSDAVE 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 Title: Re: Used modified GPX4500 Post by: Greg 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).
Title: Re: Used modified GPX4500 Post by: DEUSDAVE 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
Title: Re: Used modified GPX4500 Post by: probono 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 :) Title: Re: Used modified GPX4500 Post by: DEUSDAVE 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.
Title: Re: Used modified GPX4500 Post by: Greg 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, don’t understand why a 3 position switch unless it’s 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. Title: Re: Used modified GPX4500 Post by: DEUSDAVE 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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