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Andyy

GPZ 10" Xcoils In USA

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2 hours ago, jasong said:

I'm going to take a random guess and say this problem might be worse for us here. You in 105 degree heat at night. Me in 95 degree heat in the full sun, the machine gets quite hot to the touch, at least 120 degrees. The Aussies are in winter right now right?

Yep, I sweat my butt off last night taking measurements.  It was still 100 degrees or near.

So if I try the heat method, will it stay or just unravel later on?

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11 hours ago, Andyy said:

Yep, I sweat my butt off last night taking measurements.  It was still 100 degrees or near.

So if I try the heat method, will it stay or just unravel later on?

The heat method is what is used to make curly cables in the first place, that's how they're manufactured as their insulation is made of thermoplastic so it normally should last as long as it's not stretched too hard, if you remember the old home phone cables (if they were around when you were) they used to gradually loose their curl from being stretched, my dad used to go nuts at me for walking too far stretching the phone cord.:laugh:  There is no doubt you'll be able to fix it with heat.   I'm not sure what X-coils use for their insulation? You would think a thermoplastic, if it's a type of heatshrink you can get heatshrink that has thermoplastic glue on the inside of it. I don't know how that would compare to a normal insulation in withholding curls.

Here is a cool video on the process, it even tells you the temperature required to get a good curly cord

The reverse drill trick they do in the video is pretty cool to tighten the curls,  I didn't know that trick.

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Yeah thats fascinating with reversing of the spiral to make it tight.  Makes you wonder how someone came up with the concept, more than likely by accident.

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8 hours ago, goldwright said:

Yeah thats fascinating with reversing of the spiral to make it tight.  Makes you wonder how someone came up with the concept, more than likely by accident.

yes, they were probably using a drill to wrap a heated spiral cord tighter and accidentally had the drill on reverse! I do it all the time doing up screws and accidentally remove them instead ?

 

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On 7/4/2019 at 12:47 PM, Andyy said:

I immediately noticed a problem.  The coil was very noisy.  I tried everything I could and tried to rebalance to the ferrite. But it would not work.  So then I walked back to the truck and got the std coil.  This coil ran smoothly.  So it wasn't my imagination.  Then I switched back again to the 10" coil without rebalancing to the ferrite.  No problem.  It was smooth.  As soon as rebalanced to the ferrite ring, it was out of wack again.

I don’t have an X-Coil yet. But it appears that resetting the GPZ default settings in the Menu may provide a method to recover from an X-Coil ferrite balance problem.

I tried the following experiment.

Use headphones plugged directly into the back of the GPZ for this procedure.

1. While in Manual Ground Balance mode; upset the ferrite balance by holding the Quick-Trak button in for about 15-20 seconds while waving the coil over a chunk of iron.

2. Do not press the Quick-Trak button for this step. Verify that the ferrite balance is upset by waving the coil over the yellow ferrite core. Note the loudness of the ferrite response.

3. Page through the Menu to “Reset Settings”; open it and move to the right to select the Check mark; select it. This restores the factory default settings. It appears that it may to also set the ferrite balance to a reasonable default value.

4. Now wave the coil over the yellow ferrite core. The loudness of the ferrite core should be greatly diminished.  

5. Restore individual favorite settings and turn on the GPS and WM-12 if you use them.

I did this in my back yard with terrible EMI from the neighborhood. So even though it appeared to work it needs to be verified away from EMI.

Have a good day,

Chet

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Very interesting, Chet.  If anyone would have thought of that, it had to be you.  

Now if you could find a permanent method to keep the coil from unwinding and stretching things would be groovy.

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When using Quick Start the GPZ will reset to a fixed point set by software but every detector and coil combination is slightly different and also the temperature where you are operating will be different to were others are working. To reset the ferrite balance and Ground balance you need to select RESET ALL out of the two options, if you use Audio smoothing OFF you will need to go back into that menu option and reset as the default is Low, same goes for Threshold Pitch which is default 53. 

Finally if EMI is bad you will not be able to tell if the Ferrite balance is out unless it is WAY out as described above.

Hope this helps

JP

 

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On 7/29/2019 at 6:17 AM, phrunt said:

I do it all the time doing up screws and accidentally remove them instead ?

How on earth can you do that? Clockwise to screw up, & anti clockwise to remove. I haven't come across a reverse thread screw yet. No doubt they do exist but be a rarity & for a very specific application. Bit like reversed thread bolts & nuts. Might have something to do with your navigational skills.? Just taking the piss. I know you are good for it.

Good luck out there

JW ? 

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4 minutes ago, kiwijw said:

How on earth can you do that? Clockwise to screw up, & anti clockwise to remove.?

:laugh: You just wait, you're about to go to USA, cars drive on the wrong side of the road, toilets flush backwards... who knows what else, you're in for a shock ?  I am betting you'll drive on the wrong side of the road at some point.

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1 minute ago, phrunt said:

I am betting you'll drive on the wrong side of the road at some point.

No doubt at all. Nothing surer. And here I am here bagging all the tourists that drive on the wrong side of the road here.:rolleyes: I am well aware of the carnage they cause. I hope I don't become one of them. In the cities we will most likely just use uber. Don't plan on being in the cities for long. Best part of the cities is the road out of them. Out on the open roads I should be ok. Maybe.:unsure:

JW ?

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