Minelab Metal / Gold detector modifications SD2000 SD2100 SD2100E SD2200 SD2200V2 GP Extreme GP3000 GP3500 GPX4000 GPX4500 Detectormods is part of Link Technologies.
MINELAB Pulse induction metal Detectors.
Link for GPX4000 Instructions.
The following is published with the full permission of Australia's best known and respected prospector.
As follows,
To Peter Woodland, Link Technologies 7th July 2010
Dear Peter,
I have been using your fully modified GPXtreme now for many months on the field and I should tell you that at present, it is the best gold detector I know of. My prospecting partner, Wally, has a Minelab GPX 4500 and my brother Ed has a 4000. I have done numerous depth comparisons with both in real-life goldfield conditions and it detects deeper than the 4000 in all soils and at least as deep as the 4500 in heavily mineralised soils. In quiet, average soils it detects deeper than the 4500.
At times, Wally had to run his detector in enhance mode to handle the noisy ground with a mono and as you know, it loses depth in that mode, but I ran the GPExtreme on the same ground with a similar mono with no difficulty. However, because it has a perfect and I mean perfect threshold which is stable at any level, in reality it is my preferred detector for depth and quietness in ALL conditions. It operated perfectly in overcast conditions last week with no apparent thunderstorms on the horizon. But the 4500 and the 4000 were hard, and at times, impossible to use because of the atmospheric conditions. The 'Woody' GP Extreme was perfectly stable thanks to your most recent addition mod. Also on sunny days it ran quieter in terms of handling mineralised ground than the other two units. (Which are in perfect working order by the way).
Yesterday, I found 10 nuggets (smallest was .4 gram with 24" eliptical coil) with it during some very relaxed detecting, while not having to try and decipher a genuine signal from interference noises. What a dream detector! I am including its charms in the present Nugget finding Secrets DVD I am working on.
Best regards and thanks for all the years of hard work you have put into these mods.
Jack Lange
See 1100 Oz GOLD NUGGETS over $1000,000
Warning! Fake Minelab Coils and Detectors!
Minelab detectors and coils, Coiltek Coils are being copied and passed off as the genuine product. Do not buy them as they do not work properly. They look the same but do not perform well at all.
For More information...
http://www.minelab.com/usa/consumer/knowledge-base/news?article=19205
19/06/2001 Updates.
Testing of Mod 2 from George.
Hello Peter,despite being busy in other ways than detecting,inclement weather and tall grass and thistles ,I found 25 bits after having done mod. 2 on my 3500. These 9 bits I found in an area 8x8 m previously detected by me and very good operator, a friend of mine with 4500.I had found 3 other bits after him in this place with mod 1, and now these 9 . Biggest is 1.4g , total6.8g.They were all deep for their size. Apart from that I am finding gold again ,in places, I have not been able to find anything in years.Thank You, Your grateful George.On the Weekend we met up with Bill from Bealiba near Dunolly, Bill and his wife came over to the Laanecoorrie test site to pick up a powered amplified speaker i had for him. While at the site we tested a number of different coils on the GPX-4500, GP-3500 and Bill's SD2100. Below is an email from Bill.
Thank you for the time spent at the weekend and allowing me to test the coils
you made available.
Following the weekend and following days I am waiting the release of a
similar coil to the 18 inch mono green Kevlar we tried. We had the chance to
test other coils-advantage 18"sold by Bendigo gold-coiltek x 2-minelab DD
off the 4500 & a mono off the same machine. Yours by far the strongest let
me know when you release your 18" mono-are you still reluctant to sell the
one you have on hand??
Very pleased with the upgrade on the SD bit unstable over at Mountain
Hut-Avoca beat the 4500 hands down for depth-could have been the other
operator-I like to think it was the upgrade.
Don't forget keep me in mind for your new coils.
Regards
Bill
There is one thing that was very obvious to us when testing various coils with the GPX-4500 in normal and Enhance modes of operation. The standard range of coils are not optimum for the enhance mode on the GPX-4500. The very narrow pulse width in Enhance does not fully energize the coil inductance of any existing coils, Enhance is a very good mode for noisy ground but it seems that there is a significant depth loss with some types of coils. We will be working to see if our newer coils can be optimized for enhance mode. Minelab have made a significant improvement for working noisy ground with Enhance but newer specific coil types need to be developed.
New Metal / Gold Detector Forum...http://detectormods.maxforum.org/
How to determine if a deep signal is mineralization or a metallic target.
Click here.
Update 5/5/2010
Gold Nuggets Found with modded Minelab GP-3500 detector.
These beautiful Nuggets have been found by George with an upgraded Minelab GP-3500 using the series 1 mods. He is sending his detector over to have the series 2 mods installed, I cannot wait for his next gold nugget pictures.Jack Lange has been testing the series 2 mods with a Minelab GP Extreme detector, read his story in the May edition of Australian Gold Gem and Treasure magazine. He found a lot of Gold!!!
Now Available, I have only one fully modded GP-3000 that has been fully enhanced. This detector is super smooth and very sensitive goes ultra deep in high mineral loaded ground. This detector has full input filter upgrades, has the full low pass filter upgrades,has the 3 timing upgrades,has the low on resistance Fet upgrade, low capacitance Diode upgrades, has the timing position boost upgrades and has the output pulse power boost upgrade. We even give a full warranty on this unit. If you want the most versatile and powerful detector this is the one for you. price is $3600 Aud.
A lot of prospectors have contacted me for a detector of this type and I only have one available. 1st in first served. Sold to Walt from the U.S
SOLD.....................I will be building another one in a few weeks time.
Update April 22nd
Work is currently under way on a new series of coils, these new coils will be a large improvement on current commercial offerings. A brand new Vacuum Forming machine is being delivered and special patented wire and the best shielding available is also on its way. We are to spare no expense in making the absolute best performance coils available. These are not going to be mass produced but rather supplied to prospectors who require a performance design tailored to their specific needs.
update April 18th
It has been 22 days and telstra has finally managed to connect our phone line and ADSL internet. I went and purchased my own ADSL2 modem as they have not sent me one (as per the contract) I would probably have to wait another month to receive it.
Jack Lange of Gold Hunter Detectors, who is also one of Australia's best known prospectors has been out testing the new modifications on a Minelab GP series detector. The results according to Jack are outstanding! Check out his site for information on Gold prospecting.
Time for a color change, the new mods have been field tested and give outstanding threshold stability and no loss in sensitvity or depth. The testers have found that many signals that have been previously masked by a noisy threshold are now very distinctive target signals. This is indicative of the way enhance works on the Minelab GPX4500. The Minelab detectors are still the number one choice for a dedicated Gold detector, if you are at all serious about finding Gold stick with Minelab.
Updates for 25th March
The telephone number will still be 61 3 90175549 . The Email address is now detectormods at gmail dot com. at = @ dot=. I do this to stop spammers. gmail also has an inbuilt anti-spam filter that works great.
A detector test by Jack Lange of Gold Hunter detectors is coming out in Gold Gem and Treasure magazine, He is using an upgraded GP-Extreme detector that we did for him a couple of months back. Jack gets the same upgrades I do for every other prospector.
Nugget Finds, While out at Kingower Victoria (where the hand of faith Nugget was found) (875 Oz ) I found a 3.5 gram in thrashed ground with the upgraded GP-3500.
I had a friend with me who asked to borrow my detector, he walked out of our tent and roughly 20 meters away had a signal, down around the 2' or 60cm he pulled out a 127 gram nugget.
Rumor Finds of Large Gold , Maryborough Victoria, 660 Oz, Amherst Victoria, 2 large of 30 oz and 16 oz. There have been some others reportedly found but the Finders do not want their details made public.
In all cases these nuggets where all found using Minelab Detectors.
Updates for Feb 25th
We are not currently taking custom orders for very large Mono coils up to 2 meters in diameter. Popular sizes are 36" and 42" size using our specially manufactured Anti-Interference shield material. Our coils can be shaped into any shape you require to detect large deep Gold that has been missed by other prospectors with lesser coils. Big Gold typically lies at 4' to 12' depth in many gullies. Check Nugget depth historical references.
This is how I make my own Large Coils, the Frame is made from 6mm X 10mm Kiln dried Pine, I stick it together with Liquid Nails.I make my coils in a Hexagon shape as it is very easy to do. This massive coil can be lifted on my little Finger it is so light. The coil is cable tied to the outside of the frame. It just needs some center mounts made from strips of wood and away we go. For
extra strength the structure can be
fiber glassed if you want. This is the
way to make huge Deep seeking
coils without the $1000 price tag.
These coils can be mounted to your own frame, either Plywood or a light braced Pine frame. They can be shaped as a Round or whatever takes your fancy.
Modded SD2200D Strikes Gold
Today 21st January 2010
The prospector and the Club members have gone over this patch for some years, using every detector from the SD2000 up to the GPX-4500. As not to rain on his parade, I am not going to give away any details until it is released in the Club's Newsletter.
Well, I feel for Warren, he was pipped at the post by someone who found an old coin. The Crystal 8 gram Nugget was a excellent specimen, when I catch up with him I will post up the picture of the Gold.
January 2010 New Battery Amplifier combo for all SD GP and GPX detectors..
I now have a amplifier speaker Combo that will be made available shortly, this one uses a small speaker so it does not alert every Tom Dick and Harry in the area of your finds. It uses 2 small self contained AAA batteries that last an extremely long time. More info will be available after the field testers report back.
The battery can be mounted with Velcro to the side of the detector and the small amplifier and Speaker can be mounted to the battery or the detector with velcro as well.These are going to be cheap, the cheapest on the market.
Update N.O 2 December. I have just received a completely new batch of Ultrafast Soft Recovery rectifiers that have 30% more current carrying ability than the MUR320S types that Minelab use. The new types have less forward voltage drop and that means more current to your coil for greater depth. Last but not least is the intrinsic capacitance is less than half of the MUR320S and this reduces capacitive loading of the coil and receiver stage to allow faster sampling and greater signal levels. Being a Soft recovery rectifier means less switching noise and greater signal to noise ratio. These new components have been tested on SD GP and GPX detectors and have been found to offer a performance advantage.
Update December- "The best GPX-4500 Settings"
Click Here for the Best GPX4500 Adjustments. Test these against the settings suggested in the Outback Prospector Video's, it will make you think twice!
Update 13th November 09
Component upgrades for the GPX-4500.
New Receiver section components are just in, this gives even lower on resistance, less capacitance to the input stage and will result in more signal and deeper Gold. By lowering the Capacitance, larger coils should be much quieter on both Enhance and Normal mode.
We are the only ones to have these components as they are special order to our specifications.
We also have some Orange Display modules that allow much improved visibility in bright sunlight.
So if you want an Orange Daylight display fitted or a DIY module send me an email.
New upgrades for the SD and GP range of Minelab Gold detectors. 9th/Oct/2009.
We can now match or even better the receiver sensitivity of the newest Minelab detectors. We have upgrade components that greatly improve the detection depth on the SD and GP detectors. The best way to get extra depth and sensitivity is so improve the receiver signal to noise ratio. We can acheive a 3db improvement in the current noise figure of the receiver front end that give a huge improvement in sensitivity and depth. No one else offers these upgrades as they have been engineered and tested by myself to be the best that there is currently available.
We are currently having some GPX4500 detectors field tested with upgraded components and expect field test reports back in a couple of weeks.
New Minelab type Coils to be Released.
A New Range of Coils are to be released shortly, The first coils will be Mono in a range of 6" up to 48" The coils will need to be mounted on some Plywood if you want a Tow Coil or on a bit of plastic if you want to make your own normal type Coil. These coils can be supplied as Round, Square, Oval or Rectangular.
I would envisage "Huge Cost Savings" for those that can mount their own coil. We will then be moving into the supplying of Coil Shells as we have them manufactured. Eventually we will supply complete coils including some new patented designs.
This is the new Mono Coil Cable that is now available, specs are on Ebay . If you want a few meters do not buy it from Ebay as I can do it cheaper if you just use Paypal, money order,Gold or Cash.Oz. Cable direct is $10 per meter and postage is $5.00 Flat rate.
World-Wide is $9.20 USD per meter and $8 USD post flat rate.
Use Paypal via my email vk3kcg@amsat.org
UPDATE ! New Mods Are Available for GP and GPX Series!
These picture have been sent to me by prospectors that are using a Minelab detector that has been upgraded by myself. The one on the left is from New Zealand where the Gold won by a single SD2200D was far more than the total of 5 experienced prospectors each using a GPX4500 . Thanks Bevan.
This is the email I received from Andrew who was on a prospecting trip to Tibboburra NSW. This came with the Photo on the Right.
Now that I have put these pictures up it will cause great uproar in attempt to save face and protect commercial interests, this a cold hard fact but the pictures and correspondence is 100% true and correct. It is word for word from the owners of these detectors.
I have changed one word in (brackets).
Hi
Just an update on the modified extreme...
I also have these packs available for the GPX4000 and GPX4500, I am now supplying the 7.8 Ah battery with these kits. The Battery is labeled 7.2 volts but it charges to 8.4 Volts, exactly the same type of Cells used in a genuine Minelab Battery. I am selling these well below half price than others on the market.
Above is the Light Weight Lithium Battery with Mains and Car Charger to suit the SD2000, SD2100, SD2200, GP Extreme, GP3000 and GP3500 Minelab detectors. The Battery is 7.4 Volt 7.2 Amp Hour and weighs just over 300 grams. Also included is a Universal power adapter so you can charge the detector in any Country. The Mains charger will work off 110 Volts to 240 volts mains! I have used this battery on my detector and it runs all day on one charge.
To make your detector leadless I velcro the battery to the side of the detector and connect by audio booster to the battery and mount my speaker on the arm rest. This allows the whole detector to be used without a back pack or any connecting wires to you. The battery is very light and the weight is only 300 grams.
If you want a pack send an order via paypal using my email vk3kcg@amsat.org
For all sales in Australia the total price is $158 and that includes delivery.
For sales Wotrld-Wide the total price is $158 USD and that includes delivery.
Repair your own detector! Repair kits are now available for SD GP GPX detectors.
Contact me on 03 90175549 if you want to pay via bank deposit.
Check Out the photo Page for some pictures of Gold found in Australia and the USA.
August 2009 Updates,
*15th June 2009 Update*
On the 13th June we carried out more testing with a new series of Mods at the Laanacoorie Test site and at the Daisy Hill Gold field near Maryborough.
The information that we gained tells us that the new series of mods are very good indeed. In very well worked ground at Daisy Hill a 0.9 gram Nugget was found at 9 inches in red clay using a Modded GP detector with a 10 X 5 inch Coiltek Mono Coil, the control detector (Standard) could not detect the target at all.
One of the main goals with Minelab detectors has been to stabilize the threshold so that target signals are not hidden in the noise. A lot of the noise generated in the Extreme GP-3000 and GP-3500 has more to do with the interaction between the power output stage and the receiver stage. We can reduce the threshold warble so that the detector is rock solid stable!
I have made quite a few video's on the Minelab Pulse Induction Detectors,
Have a look at my YouTube Video's at, http://www.youtube.com/user/woodypoopoo
Why Woodypoopoo ? When I was trying to register an account everything I tried was taken, out of frustration I typed woodypoo and that was taken..so I typed woodypoopoo and it was available. So now I am stuck with it as YouTube will not allow me to change it. So I have to live with it. I may change it one day but that involves reloading the video's.
a Gold Nugget from the Goldfields of Thailand, a generous prospector sent me this for doing some work on his SD-2100. He was getting a lot of Gold from his patch, 260 grams in one hole at 2' deep. This one is 12 grams. Thanks Paul.Join the prospecting forum to see all the pictures of prospecting in Thailand.
You will have to Join the Forum to View the Links.
Here is a Link to a Report on a Modded SD2100 being used in Thailand, Note the ground was already worked with a GPX4000 !
The amount of Gold coming out of the ground tells the story.
http://www.invisionplus.net/forums/index.php?mforum=goldprospecting&showtopic=2733&st=0&#entry7304
This site is here to show you how to modify and carry out simple repairs on Minelab Metal Detectors. I offer a modification service for all the Minelab P.I detectors. The list of mods is growing all the time as we carry out different circuit changes to field test.
All the mods will definately improve you chances of finding Gold Nuggets of all Sizes. There is NO detector available that can beat the depth on the modded detector!
Check out all my Video on Youtube as there is a lot of helpful info that you can use.
Check out the Detector Video's on Youtube...
http://www.youtube.com/user/woodypoopoo
Contact : detectormods (at) gmail.com The (at) = @ Its to stop spammers. You can also contact me via my Ebay username Metaldetector on Ebay.
Woody
Who is Woody? My real name is Peter. I have been running Link Technologies for 25 years. Ive been an electronics Engineer for 28 years. Specializing in Radio Communications and Analogue systems. Design and development of everything from Tube audio amps to space based Satellite power amplifiers and low noise receivers. Now heavily into Minelab Pulse Induction metal detectors. Just completed a ground loop system, it can detect a Coke can sized object at 6.5 ft or over 2 Meters.
