False signals when coil is bumped

[IMAUDIGGER]

Seems like all of my coils end up being useless after about 2 years.
It’s usually because they start false signaling when bumped or moved quickly.
This is probably due to the fact I use it in heavy brush and constantly bump it on rocks.

I currently have a Makro Gold Racer coil and it’s to the point of being useless.
This is a high frequency machine that is ultra sensitive when things are working properly.

I’m going to take the coil apart and see what the problem is. Anybody ever done this before?

I’m curious what’s inside. I suspect the coil wire has lost its tension due to the fact that it’s not encased in resin, or there is a piece of thin paper bouncing on top of the wire.

 

[Kray Gelder]

My F75 falses when bumped on brush or hard objects. This is not rocky terrain in the lowcountry. It's not really an issue. In very dry weather it will false from static when dragging over dry grass or ground cover. I have gotten used to it and recognize it when it happens. I imagine searching rocky ground looking for nuggets is tough on these coils. Good luck to you.

 

[man_in_black]

Does this get progressively worse over time (based on the number of "bumps")? I run into this occasionally on my F44 here on Pensacola Beach (just dry sand), when I skim the top of the sand.

 

[A2coins]

Seems normal on most machines Do you use a coil cover

 

[releventchair]

Your coil cables wrap pattern ,shape/form can affect such too. A flopping part of cable usually the worst.
Coil wobble where attached can be checked for too.

Adding a bumper of 3/4 air hose split on one side and wrapped around coil edge would add weight and a little height from ground , but if you want to experiment . I'll cheer for ya!

 

[against the wind]

If you use a coil cover, every once in awhile, it should be removed and cleaned.

 

[IMAUDIGGER]

Not my first rodeo.

I have 4 different coils for this detector and frequently switch them out depending on the type of detecting I’m doing.
This one particular coil is getting worse and worse. When your looking for faint signals from small pieces of gold buried or partially covered by rocks, you have to really listen to what it’s telling you. If it’s giving you false signals at the end of every swing, when you brush up against grass, or bump the coil, you are having to recheck signals that you should not have even heard. When it gets to that point, I typically buy a new coil. It wears my patience thin quickly, which isn’t good for finding gold.

Taking it apart for curiosity sake will be better than me slamming it against a tree trunk!

I have several Fisher GB2 coils sitting around that developed similiar problems. New coil always fixes it regardless of how the cable is wrapped.

 

[Kray Gelder]

Not my first rodeo.

I have 4 different coils for this detector and frequently switch them out depending on the type of detecting I’m doing.
This one particular coil is getting worse and worse. When your looking for faint signals from small pieces of gold buried or partially covered by rocks, you have to really listen to what it’s telling you. If it’s giving you false signals at the end of every swing, when you brush up against grass, or bump the coil, you are having to recheck signals that you should not have even heard. When it gets to that point, I typically buy a new coil. It wears my patience thin quickly, which isn’t good for finding gold.

Taking it apart for curiosity sake will be better than me slamming it against a tree trunk!

I have several Fisher GB2 coils sitting around that developed similiar problems. New coil always fixes it regardless of how the cable is wrapped.

Yeah, take it apart. Maybe a dab or two of RTV sealant to hold a loose part in place may fix it. There's always duct tape! Let us know what you find.

 

[smokeythecat]

I have had that with any machine I've owned, but only on certain occasions or when I used the coil as a weed whacker. Which I would never do...no...not me...no...not ever. Is my nose getting longer?

 

[pa-dirt_nc-sand]

I had similar problems with my Garrett coils. Micro cracks in the resin. Would work ok until moisture, then go wacky. Would thoroughly dry out, then cover with epoxy 2 part paint. Would last another 3 or 4 months until the moisture was salt water then they would go permanently wacky. Learned to stick with the coil cover even if wrapped in duct tape to hold together after cracking.