Coiltek Coils For The GPX 6000 - Confirmed!

[Chet]

Most EMI is picked up by the coil. The coil receives EMI similar to the antenna of an AM radio.  The larger the coil surface the more EMI is detected. Proper EMI shielding of the coil is the most critical factor.

For a low impedance mono coil the approximate three foot of lead can be a twisted pair of unshielded wires and be very effective in canceling EMI. It does this by the EMI on each wire being balanced and of opposite voltages being introduced by the twisted wires receiving equal and opposing EMI signals.

With a Double D coil the low impedance transmit wires are often a unshielded twisted pair. The higher impedance sensitive receive coil is normally connected by a small diameter shielded cable. 
 

[phrunt]

I was hoping you would chime in Chet, thanks!

[RoobyRoobyRoo]

1 hour ago, phrunt said:

stricks very useful 11" coil X-ray, the coil cable doesn't look wrapped in foil to me, would the X-ray not pick up the foil as a solid mass and not show the wires inside it if it was foil or braided?  The GPZ 7000 coils have no extra shielding in the cable and I find the 7000 very good with EMI, if not excellent.

The GPZ 7000 coils have no shielding inside the cable, the shield is just a little blue wire going down from the control box to the coil.   You'll see on this photo of my 19" Coil where I was adding the plug end back onto it to use it on an X-coil adapter.  I suspect the stock GPX 6000 coils also have no shielding in the cables.  Perhaps the aftermarket do, I know some do.

You're right, it looks like standard multi conductor. What Minelab would say is "we don't need any shielding as we twist our conductors like is done in ethernet cable and that cancels out any RF (sneezeBULLS&ITsneeze)

As to the blue wire in the 7k, that's not shielding, it's static drain/ground.

... yes you're right, looking closer it does look (the red cable) to have shield, flowing in both directions... good eye... sucks getting old..

 

[phrunt]

We always used shielded Cat6, what's the point using the cheaper twisted version when the price is so close to the same for the much better quality shielded cables.  Even in a home situation there are many appliances and power cables running through the house to interfere, and fluro lights are killers for Ethernet cables.

Shielding helps protect the data from any sort of electromagnetic interference from an outside source. This could alter or weaken the signal traveling through the copper in the cable. The shields of the two connectors in our shielded Cat 6 cables are electrically tied together via the drain wire.

I never understand any place that tries to save a few cents by going cheap on things that are so cheap and easy to use an improved version.

[phrunt]

New toy arrived! It arrived too late in the day to test it out.

The water hunters will be pleased to see it has a nice solid base under the skid plate so it won't fill with water.

Will give it a spin tomorrow and see how it goes on some test targets, then should be able to go for a gold hunt Friday, got too much to do tomorrow for that.  Feels solid as a rock, really nice tough build quality.    People won't need to put protective stickers on these coils that's for sure, such a different plastic.

[strick]

The radiographs are slightly under exposed in the first two you show Simon the plastic details well but under exposing the metal showing less detail thus the solid looking mass... the ones I took are slightly over exposed showing better detail of the wiring...and less of the plastic...adjusting the power and the time on the generator  you can manipulate the picture to show softer structures or more dense structures accordingly.  I was hoping coiltek would chime in on how their coils are built. They certainly look good from the outside lol

strick

[Coiltek]

On 8/8/2022 at 7:53 PM, strick said:

Most of the talk has been about coil shapes and sizes...the excitement reminds me of kids ordering ice cream in a store....I’d like to know more about how they are built compared to your competitors? NF goes into a little detail about their construction methods on their web site...I could not find much on yours...What are the components that go into the build quality of your coils? From out side to inside. 

Strick 

Hi All - been away for a bit out West on a sales trip and running the coils... Geez I like them but some would say I am bias 🙂

A quick run down for you....

ABS plastic injection moulded housings - 2mm thick for extra strength and assist with minimising any flex when swinging

Cable and internal PCB parts all same as Minelab (as do NF coils) - I can assure all that the cables are shielded very well and I do not believe that if there are any issues that the cable contributes to this.

High grade LITZ wire - same as what is int he ML coils.

in-spec shielding top and bottom of coil

Pressure regulation pad to keep out water and dust but assist to regulate the pressure in the coil to minimise any swelling and induced noise

Wings thickened for robustness and 8mm nylon nut and bolt.

Poly carb label to look good - always! 😉

All made in our Salisbury South manufacturing facility where we have 13 staff plus me (sales and technical) and my wife (CEO & Marketing) building coils and also making electronic windings (inductors,transformers etc) inc. QA, Engineering, Customer Service etc and all other things to keep a small-medium business running... 

I hope this answers your query on this...

Regards, Trevor.

 

[strick]

Thanks for the response Trevor...the other guy uses core cell in their coils its good stuff but expensive the reason I know is I’ve bought plenty of for use on boats . Do you use a  light weight foam coring as well?

strick 

[Coiltek]

2 minutes ago, strick said:

Thanks for the response Trevor...the other guy uses core cell in their coils its good stuff but expensive the reason I know is I’ve bought plenty of for use on boats . Do you use a  light weight foam coring as well?

strick 

Yes we do... A foam inner core which the windings are laid in - lightweight and strong. 🙂 

[GotAU?]

6 hours ago, Coiltek said:

“Pressure regulation pad to keep out water and dust but assist to regulate the pressure in the coil to minimise any swelling and induced noise”

 

Hello Trevor,

just purchased the little 10x5 for my 6K and will be using it for the first time in the mountains this week.  I have a question about using the pressure regulator tab, as the places I intend to use it will be over 5000 ft (~1500m) above my current elevation, I assume my coil will be a little puffy when I get there and may need to lose a bit of air. Then when I get home it’ll be a little concave and I’ll have to let some air in.

Anyway my question is how much noise have you noticed happens from when the coil is going through pressure changes and to what amount of elevation change have you noticed  that happening?  I’m curious if ML Coils are affected by this as well?

Thank you, and I really appreciate the build quality of this coil, you guys did a great job on it. I will certainly post my successes with it when (and if 😁)  they happen!

-Anthony