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Messages - woody

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We managed to obtain better batteries and a new high capacity one that sticks to the side of the detector. Look on the products page.

Mods and Price list / Two very different prospecting techniques.
« on: May 03, 2018, 03:24:50 am »
My goal has been to keep my detector quiet as a mouse when I go detecting so that I can hear the most tiny ground change that may be a deep target. Most prospectors detect this way but I came across a fellow that had his detector cranked up so high I thought that there is no way that he can find gold, then I had an education.
He was using a modded GPX5000 with the front gain nearly full and the back gain on 20.  I thought no way, this guy has lost his marbles but then he showed me a 16 oz nugget he got the day before, then he showed me the pictures on his phone and I was amazed.

General Discussion / Re: Anyone here
« on: March 17, 2018, 02:13:36 pm »
Hi Wes,

There is nothing to report so yes it is quiet on the forum.
There is much more happening in the lab, also we set up a gold exploration company with 1200 square kilometres in prime gold location.

General Discussion / Re: Quiet here
« on: January 17, 2018, 11:55:27 am »
It is so hot around the goldfields that most prospectors are sitting in their air conditioned rooms.

I have been experimenting in the lab.

Hi Wes,

I have no idea on who sells Detech in the US,

On the 7000 / 5000.  A part of the reason the 7000 gets more deeper small gold is the coil. You have to realise that the 7000 coil has three coils inside, the transmit coil is very small and puts a lot of concentrated energy straight down onto the small gold. If you do the side by side comparison with a 14” mono it is not fair, the correct way to do side by side is to use a 11” DD  or a 5”x 10” mono.  In the US as far as i know, the coil is not so hot and mineralised thus I cannot see why the 7000 would get more gold so it must be a coil winding size mismatch.

The 5000 can have its gain increased by a few component changes and changing the timing using the modified manual tuning can make the 5000 super sensitive to very tiny gold.

General Discussion / Re: Detector controls
« on: December 30, 2017, 12:56:30 pm »
Hi Wes,

There is an update on new settings coming out in the Australian Gold Gem and Treasure magazine next month.

The frequency setting on the back lcd (manual tuning) has a very limited range, to give you an idea it moves this much  --- when we convert it to maximise the range it is --------------------------------------------------------------- and thus it allows getting similar gold like the SDC2300 and also allows working super hot ground with way less noise.

Matt from Ballarat in Victoria has been carrying out a lot of experiments with different frequency settings in enhance and fine gold and has been cleaning up the gold left by others.
Look for Matt Kelava on facebook and check out his videos.

General Discussion / Re: Modified GP3000
« on: December 08, 2017, 09:17:27 pm »
Good work, The 7000 is good in some ground but not all ground..where the GP is fairly good in all ground after mods.

We have some Enhancement Fets coming out way in a couple of days, lots of testing on the sample devices. These will obtain near zero loss on the signal input side, extremely low capacitance of 28pf ci  22 co 3 tc  R on of less than 100 milli ohm at 5 amps. These fees are in die form, custom made for us. expensive little buggers.  The original standard fets do generate electron mobility noise in the  D-S conduction channel in most fets, also the channel can be modulated with fluctuation of the gate driver. This causes wide bandwidth noise and can obscure small signals.  We are working hard to overcome these issues. More Gold to you.

Information on the new developments / Re: Z mods
« on: September 19, 2017, 05:14:25 pm »
Yes, see post on GPZ-7000

Information on the new developments / GPZ7000 upgrades...yes yes yes
« on: September 19, 2017, 05:13:27 pm »
We can now upgrade the GPZ-7000 , greater depth, better small gold performance and more stabile and quiet.

(Pity we cannot make it lighter)

Currently carrying out tests on a variety of ground.

General Discussion / Re: modded GP3000 settings
« on: September 18, 2017, 08:49:57 pm »
It is good to hear that you are doing well with the mods, I am always working on mods, t the moment doing some experimental upgrades to the GPZ-7000 and see how it pans out. I have an article coming out in GGT in regards to detector technology. With the GP if it has variable frequency and variable gain it should be kicking goals for you. The latest is changing the components in the input stage to get lower losses and less noise.

Around 10 years ago I wrote an article on geotech about installing variable damping resistance into the SD2000 or any P.I detector, setting the damping to match the coil and to a degree the ground reactance can make a substantial improvement to the early time detection of small signals. It would not be too dificult to incorporate an automatic variable damping system into a P.I to critically match the coil characteristics when using different modes of timing to cover various decay profiles. It would be even better to use dual damping on different pulse lengths to optimize the decay on both the high and low voltage tx pulses to better match the the system to the coils that all differ in decay due to manufacturing variations.

Sensitivity and low noise are dictated by where the low noise components and gain is set in the signal gain block. Firstly you get maximum depth and sensitivity the most important thing is to remove resistive loss before the first amplifier, this includes the resistive characteristics of the input mosfets. With a coil resistance of 0.5 ohm the resistance of the input fets at around 5 ohms eats up a fair amount of the signal that is available to be amplified. Other losses are the capacitance of the coil, the cable and capacitance of the input components that reduce the initial slew rate of the detector to be able to recover fast decay target signals. To recover all available signals the initial input stage should have low noise and adjustable gain to suit the ground conditions. The set gain of 33 gpx5000 or 47 gp series and gpx4500 is too much or too little depending on ground decay characteristics. The back gain takes place after multiplexing and as far as i can tell with the existing block gain there is signal loss and trying to boost it greatly increases the overall system noise and target signals can be swamped by the noise. The front end gain sets the input signal at a level that produces optimal signal levels in respect to ground noise the get an improved signal to noise ratio and get the most out of the detector. Many variables need to worked out properly and not just increase the gain, sometimes less is more and sometimes it is the opposite. I also found excess capacitance can cause an offset in the ground balance and thus needs to be greatly reduced as to get better ground balance.

General Discussion / Re: new mod settings on 4500
« on: August 07, 2017, 10:10:02 am »
Total overkill , but if its cheap...

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