First Afternoon Using The Goldhawk 10x5 Mono

[GotAU?]

@AureousDoc could’ve put an integrated shield into his detector covers- or a user can cover the inside of it with aluminized duct tape.

One question- do you ground the shield to the detector circuit board, or to yourself and eventually down to the ground? I suspect it is to the circuit ground….right?

also, can you explain a little bit more about Y-axis interference?

[GotAU?]

2 minutes ago, GotAU? said:

[Aureous]

@GotAU? The shield I have right now is passive, no ground connected. But, to do it completely right, ya gotta run a wire from the shield to the earth wire which is taped to the graphite-paint shield on the inside of the control box. To do this, ya gotta crack open the box and 'presto', your warranty is null and void . I'm gonna try and 'double up' and apply copper tape direct to the control box exterior (provided that it peels off Okay).

Y axis noise is the Earths own magnetic field being detected by the coil. It runs parallel to the ground. You tilt the coil off its preferred 'X Axis' and it appears, more or less depending on the detector type and coil type. 

[phrunt]

It was easier with the GPX 4500/5000 where the screws holding the front and rear fascias on touched the alloy shielding and metal housing which was the floating ground.  The 6000 housing shielding is very basic with just some shielding paint on the plastic housing, you'd really need to shield to the PCB, and can't without voiding warranty.

So really, not much can be done.

 

[GotAU?]

29 minutes ago, phrunt said:

It was easier with the GPX 4500/5000 where the screws holding the front and rear fascias on touched the alloy shielding and metal housing which was the floating ground.  The 6000 housing shielding is very basic with just some shielding paint on the plastic housing, you'd really need to shield to the PCB, and can't without voiding warranty.

So really, not much can be done.

 

So if the shield has to go to the PCB ground, I wonder if the speaker ground goes there as well?  May be a ground point doing that.

I’m thinking of trying Aureous’ passive shield idea also  by modifying the inside of My Doc’s cover.

[GotAU?]

50 minutes ago, Aureous said:

@GotAU? The shield I have right now is passive, no ground connected. But, to do it completely right, ya gotta run a wire from the shield to the earth wire which is taped to the graphite-paint shield on the inside of the control box. To do this, ya gotta crack open the box and 'presto', your warranty is null and void . I'm gonna try and 'double up' and apply copper tape direct to the control box exterior (provided that it peels off Okay).

Y axis noise is the Earths own magnetic field being detected by the coil. It runs parallel to the ground. You tilt the coil off its preferred 'X Axis' and it appears, more or less depending on the detector type and coil type. 

Thanks for the reply.  And wow, the Earth’s magnetic field? That’s pretty interesting, especially as detectors become a lot more sensitive to things like that.

I am thinking of trying your passive shield idea with my Doc’s cover also after your trial, so please post about the results!

[GB_Amateur]

5 hours ago, Aureous said:

I'm gonna try and 'double up' and apply copper tape direct to the control box exterior (provided that it peels off Okay).

I assume you intend to use the kind with conductive adhesive, but since both kinds are sold it's worth a mention for others who may not be aware of its importance.

[GotAU?]

The type I want to try, by sticking it on the insides of my Doc’s cover, is aluminum duct tape used by heating suppliers. I’ll have to be sure that there’s conductivity between the strips, perhaps by bending the corners down over each other, but it should work out pretty well as a shield.

while I’m at it, I’ll make a stick on foil hat for my head!?

[phrunt]

9 hours ago, GotAU? said:

So if the shield has to go to the PCB ground, I wonder if the speaker ground goes there as well?  May be a ground point doing that.

I’m thinking of trying Aureous’ passive shield idea also  by modifying the inside of My Doc’s cover.

Speakers negative is a common ground connection normally.  I don't think it will make much difference as most of the EMI is likely from the coil.