Has anyone had any experience with these things?
Electromagnetic and magnetic interferences could be extremely annoying when you are looking for that hard to find gold nugget. Most of the noise is picked up by the search coil but a significant level of noise is being picked up as well by the sensitive electronics inside the control box.
The control box is made of aluminium therefore the magnetic field easily penetrates it.
To prove that, approach a magnet to the right side of your detector when switched on.
Millions of less obvious noise signals are interfering with your detector.
We have developed this Shield from the best quality material primarily used in sensitive
medical and scientific electronics. After years of studying and testing different materials we have found this one ticks all the boxes.
I have revisited the places where I've previously cleaned up and found more gold after installing the shield.
It is 0.35 mm thick, held firmly around your control box by the armrest and the new improved version with dual layer shielding on the right side is only 175 g!
We have tested it on the GPX 5000 with amazing results such as quieter threshold, better GB, resulting in slightly increased depth.
The shield allows you to increase the Rx gain by a notch or two without compromising the threshold. Use Inverted Response when hunting for big deep nuggets.
I noticed it on Ebay today while I was looking for a cover for my GPX.
I have noticed I've been able to quieten down my GPX by opening the control box up and scraping some paint away where the shielding touches the casing, on one end they had scraped away paint from one screw point during production, and the other end had no paint scraped away at all by the factory so it's sheilding was basically useless. By scraping paint away from a few areas on each end of the detector I was able to give the GPX a bit of a noticable quieten down. I am sure on later models Minelab would of scraped away more paint but as mine is a very early model made in Australia version this wasn't done.
By Steve Herschbach
We just went through a few years on constant releases of new prospecting detectors. And now the flood has subsided, with almost nothing on the horizon.
There is the “any moment now” Makro Gold Kruzer, running at 61 kHz and waterproof to 15 feet. After that however it gets pretty thin.
First Texas has new detectors in the works, but nothing rumored that is aimed specifically at prospecting this year, but maybe later. Right now a PI beach detector appears to be up next. Garrett - maybe they are working on it but personally I have given up waiting on a lighter weight ATX. Tesoro - nothing going to happen there obviously.
Minelab still “owes” us GPZ owners a smaller coil but with Equinox occupying all their efforts....?
Nok/Mak outside of the Gold Kruzer has been working on a PI for years, but absolutely no hints on it getting any closer to market.
XP I thought might bring a version of the low cost DPR 600 to first world markets but no sign of it happening.
And White’s? Who knows. Maybe we will see a repackaged GMT but the shine has worn off of repackaged detectors these days.
Long story short is it often takes new detectors to stir up activity on forums. For now at least the future is looking pretty quiet. The good news is we can just focus on using what we already have to best effect without being tempted or distracted by new shiny toys!
Just re-read your "Steve's Guide to Threshold, Autotune..." It helped a lot. Thanks.
I do have a question though. I understand V/SAT. It's about how fast autotune re-adjusts the threshold after encountering some disturbance like a target. However, I'm unclear on how that relates to Ground Balancing and Tracking. It sounds like they are the same. Would you please explain that?
Tried out a new detector on Saturday:
Due to some unavoidable delays, I finally made it out with my Makro Gold Racer on the weekend to see what it could do.
I don't know about where you live, but winter here just didn't want to let go this year. I mean, we had one of the coldest, longest winters we've had in forever, and snow, snow, snow (we're about four feet over the average mountain snowpack at the higher elevations as I write), but Old Man Winter finally took a breather, and so I got a chance to head to the mountains to swing the coil again.
The place I picked was one that didn't have a lot of exposed bedrock, just a small section really, with the rest of the ground covered with six to eight feet of overburden on top of the bedrock, and that's just too much overburden for the size of gold I commonly find.
As for the weather that day, it was a true mixed bag. I mean this time of year, we can get all four seasons in one day! Saturday was no exception. It rained early in the morning, then the sun came out and it was nice and warm, then it clouded over, started to rain again, then turned to snow, then the wind blew a cold blast of air for about an hour, then the sky turned blue and the sun came out once more, the wind stopped, and the weather did its best spring imitation for the next three hours.
I unlimbered the Gold Bug Pro first, and you can't make this stuff up, within three minutes, I'd found a three gram nugget, one my wife said looked sort of like a four-leaf clover. And, Nature indeed had made it look kind of like one. The nugget was sitting in some tough clay that held a lot of former river stones, so it seemed to me that it was likely what used to be the bottom of a crevice long ago, as the surrounding bedrock had been cut down at least a couple of feet by the former placer miners whose actions would have left the sort of deposit I've described.
I kept working the exposed bedrock and any places I could find where bedrock had been tossed out in case some gold had ridden out with it. (I have found nuggets this way before.) I really took my time and went slow, because I wanted to be sure I'd cleaned the area before I broke out the Gold Racer so I'd have as accurate a comparison as I could. By the time I'd finished with the Fisher, I'd gathered another gram and a half of small stuff that I'd thrown in the bottle.
My wife had wandered off, and I found her panning near the foot of channel wall, but she wasn't having much luck; however, she pointed out something to me that I'd have completely missed. To the north and east of where she'd been panning, there was a short section left of what had been a bedrock drain, and there were small sections of bedrock still exposed that the boulder clay hadn't reclaimed.
Nevertheless, I headed back to the original bedrock I'd worked with the Gold Bug Pro, and I broke out the shiny new Makro Gold Racer. The ground balance worked flawlessly, and setting the sensitivity was a breeze. The ground was moderate to a little hot, so I didn't have to worry about adjusting the ISAT, and I was pretty familiar with the types of hot-rocks I'd likely find, so I knew most, if not all, of them by sight.
I started by running the coil slowly over the areas I'd hit with the Bug Pro, and after a few sweeps, I had several quiet but distinct signals. When I dug down, the signals got louder. I called by wife over, and she took the dirt with the signals and panned them out. Neither one of us could believe the tiny gold in the pan! The Gold Racer really did deliver on finding small gold. However, the first bedrock area was not where I realized how good the Gold Racer could perform.
Remember I mentioned the bedrock drain? I headed over to it with both detectors. First, I scanned the small exposed areas exceptionally carefully with the Bug Pro, and I got a few small pieces, then I ramped up the sensitivity on the machine as far as I could, fought the background chatter, and all in all, liberated about half a gram of gold from the bedrock.
I swapped out the Bug Pro for the Gold Racer and covered the same areas again. Almost immediately I had a signal. I couldn't believe it, but the signal was clear, and I could see a previous dig mark where I'd nailed some small stuff with the Bug Pro, and the Racer was giving a crisp signal, quite unmistakable, right in the same dig hole! To make a long story short, three inches of bedrock later, a nice picker was in the bottle! This blew me away, as the Gold Racer had found the target while running nice and quiet, with the sensitivity not ramped up, yet the signal was very clear.
I kept at the small sections of bedrock, and kept getting quiet, but clear, signals until I'd added another gram and a half of small gold to the vial. (Sometimes I'd get a break in the threshold too, but when I dug down, the signal either disappeared or it turned out to be a target. [Some heavy iron deposits in the bedrock did give a weak signal, but I soon learned that due to the broad nature of their signature exactly what they were.])
What this weekend's outing made me realize is that if I'd have given the Gold Racer a run the end of last summer, I'd have undoubtedly recovered a lot of small gold, and I do mean a lot, that the Bug Pro just couldn't see (this test was carried out with virtually the same coil sizes on both machines, elliptical shapes and DD's as well), and knowing now what I likely left behind last summer makes me a bit sad. (Out of six grams of gold for the Saturday, a gram and a half was fine stuff from the Gold Racer, and that's a pretty good added portion of gold recovery I'd say.)
In fairness to the Gold Bug Pro, let me say this: I've found lots and lots of gold with that great little machine, and it's super easy to learn how to use making for a quick learning curve. In addition, I don't have an unkind word to say about the Fisher as it's paid for itself many, many times over, and I will continue to use it, and I'll continue to train others how to use it as well. Moreover, let me say that the Bug Pro doesn't run at nearly as high a kHz, so it's unfair to compare apples to oranges that way, but I wanted to see what I was leaving behind, that's all.
So, I learned my lesson well on Saturday, and I gained a whole lot of respect for the little Gold Racer for how sensitive it is to small gold, how good it punches into the ground to find it, and how quietly it goes about its job of doing so. Furthermore, The Makro is a great little gold machine I can swing all day long, and I'm looking forward to really taking it for a long, dedicated run this summer to add more gold to the poke because it sure gets the job done in style! (How I wish some fine company would produce a light-weight gold-hungry pulse machine with excellent capabilities or that Minelab would find a way to lighten the technology package of their GPZ 7000. Wouldn't that be great?)
(I'd like to thank Steve for pointing me in the direction of the Gold Racer, and I'd like to thank Dilek at Makro for her exceptional customer service.)
All the best,
I made this video to address these concerns: