Anyone else get this?

[Silverstar_Lawman]

Have a Minelab Sovereign GT and when I sweep its fine and hunting its stable but when I just bump the coil with my finger its sounds off or when I do like a rachet motion it will sound off, any ideas?

 

[Silverstar_Lawman]

Is it normal for it to null if you give the coil a little bump? it does not do it everytime I bump it only sometimes then the threshold comes back. I'm only asking because I still have full warranty and if it needs fixing I'll send the coil in.

 

[Mike (Virginia Beach)]

It depends on where you are running your sensitivity...the hotter you run it, the more sensitive it will be. Also, check to make sure your connections are tight and that your coil wire isn't to close to your coil...like hanging down over it. And finally, stop bumping it!

I doubt there's anything wrong with it.

 

[Art (NWOH)]

This sounds normal if the ground has significant iron content.....
Two things are probably happening to you........
First, bumping the coil causes it to flex slightly. This throws the coil's cancellation between recieved and transmit signals slightly out of balance causing the detector to see a signal spike. This is a mechanically induced false. Keep in mind that a false can be audible or a null (iron false when no iron object are present). This is most likely to happen as long as the coil is seeing the ground or some nearby object.
Second.....There is probably iron content present. As long as the detector sees a smooth enough variation in the mineral it will not null out. A bump causes both a flex in the coil AND an abrupt change in how it sees mineral. This produces a sudden change from the "average" value of the ground and fools the detector into thinking it saw an object.

You have probably noticed that your detector nulls less when swept slower. Changes in ground mineral are less abrupt this way, and the detector has time to correctly analyze the ground so that it won't think it is looking at iron objects.

HH

 

[Silverstar_Lawman]

Thanks for the answers guys, I'll just quit bumping it.

 

[mick]

I'm new to the Sovereign but with my GP gold detector, if I get sand or dirt inside the coil cover (skid plate) it will false. I just seal the coil cover with vinyl tape. Not sure if the Sov acts the same way because I haven't had mine long enough.


mick

 

[Mike (Virginia Beach)]

I haven't seen a detector yet that didn't react that way. It's one of the down-sides to using a coil cover. It's especially important at the beach, where you either need to empty it constantly, seal it up to keep the stuff out of it, or not use one at all. With my Excalibur, I choose to not use one.

 

[mick]

Thanks Mike (VB),

I can see taking it off at the beach, but relic hunting would be pretty tough on the coil without the cover. In the desert looking for gold, we have to use a cover. I just seal mine with a bead of silicon and some vinyl tape. That usually does the trick.

mick

 

[Mike (Virginia Beach)]

I always use a coil cover relic hunting. And that's where I use my GT. At the beach I use the Excal and that's the only place I use that machine. So no cover on the Excal and always a cover on the GT (or the CZ-70, if I'm using that). But I agree, you wouldn't want to land hunt without one.