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Reports Of GM1000 5" Coil Touch Sensitivity


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This subject has been mentioned before here but it seems some people are having issues that may go beyond the "norm", whatever that is. See Bill Southern's forum at http://nuggetshooter.ipbhost.com/topic/30883-mike-c-falsing-fix/

My 5" coil starts to exhibit touch sensitivity at Manual Sensitivity level 9, becoming more pronounced at 10. I have had no issue of note with my 10" coil, which is the coil I use almost exclusively. My impression has been this touch sensitivity in the 5" coil is inherent in the High Gain/Audio Boosted design of the GM1000. For me the solution had been to either lower the Gain/Sensitivity or to just get down and dirty with coil control. See my post from May at http://www.detectorprospector.com/forum/topic/3614-understanding-the-sensitivity-control-on-the-gold-monster-1000/?do=findComment&comment=39955 as regards all this.

Any experienced detectorist knows a loose coil cable near the coil can create problems, and Mike Conner has suggested affixing the coil cable on the 5" coil as firmly as possible to prevent movement in the cable, with what he reports as being good results.

This has been a non-issue for me as I run the 10' coil almost exclusively and my sensitivity when in manual ranges between 6 - 8 with rare forays to higher levels as described in my recent thread here. My main concern is reports of 5" coil touch sensitivity at much lower Gain/Sensitivity levels than what I have experienced. So the big question for you Gold Monster owners (no second hand reports please) - what coil sensitivity are you experiencing and at what Gain/Sensitivity level does it start to exhibit with each coil? Have you tried more firmly affixing the lower cable to the rod, and has it helped?

 

 

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I have had issues with both coils , but only in manual settings and only at near maximum gain . In auto and auto plus the coil rarely falses . If you are searching over quartz dumps and banging into large jagged rocks it will probably be a problem , however in most ground running over small pebbly scree I have not been greatly inconvenienced . The small coil seems to be used by people trying to get the coil down in between broken shale schist in bedrock areas and are more likely to bang the coil in between gaps . The specialist niche this detector fills is probably why the problem is most noticeble , but personally I have not found it causes too much distraction , the noise is easily identifiable for what it is ,and if your hand is still vibrating after hitting a  dirty big rock you don,t have to be rocket scientist to work out what has just occurred. My advice would be to turn down the sensitivity (it works better that way ) at least in my soil ,and slow down so you minimise rock strike. Fixing  the coil wire to the shaft only seems to restrict the movement of the coil in general although if you use it in full sensitivity in bedrock areas it may be beneficial . 

 

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Hi kiwi

i would think in the sort of ground you work and in the high sensitivity setting you use , you would be a contender to suffer this problem  as much as anyone . That said , this model is a mass produced item , sold around the world and could well suffer from inconsistencies in manufacture the same as any other . And if it is fallsing to some degree for most it's quite likely that a certain number are a little better or a little bit worse. And a small number could be a lot worse. I'm sure minelab would look after those that are finding abnormally high problems with there machine.remembering that the detector was designed principally as an all auto concept . I don't think the designers  had in mind people turning the sensitivity to full in manual and scrubbing the coil into very irregular ground . It's all about compromise and making the best of things.

Happy specking ⛏

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Haven't had an issue with it and have almost only used the 5" coil. Can actually scrape the coil on the ground and amongst stuff without much issue. 

I have taped the cable up the shaft a little bit with electrical tape.  

I do get some noises but only when I'm putting the coil under ledges, bushes, etc and the actual cable gets knocked. 

Just lucky I guess :smile:

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Until yesterday I have been using the 5" coil exclusively sniping bedrock. Like others have said, the bump sensitivity  is worse when using higher gain. The coil cable is the worse offender. Every root or branch the cable hits really makes it sound off. I have adapted pretty quickly to the extra noises with the 5" coil since I'm use to running my coin detectors pretty hot, but when I put on the 10x6 yesterday for the first time it was annoying.. I was still shooting rough bedrock which is better suited for the little coil but I just wanted to give it a run.   The 10x6 touch sensitivity was much worse in those conditions than my little 5" coil.  A lot of the extra noise can be tamed by running on 6 where I hunt but I have always had a hard time turning down the gain.  It's a mental thing I need to get over.

Besides the touchy coils, the little Monster is growing on me.  I sometimes miss having a threshold I guess out of habit but the simplicity, design and sensitivity to super small gold makes the Monster an easy choice to grab over my other VLFs.

Bryan

 

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I got out yesterday with the Gold Monster and got a nice specimen with a few dwt of gold, but my GM (with the large coil) began falsing on everything that touched it - a blade of grass, a rock, a twig - anything. I had to hold the coil far enough above the ground that it touched nothing.  It was not like that at the beginning of the day. Turning the gain down did not seem to help much. I will fiddle with it some more today and see what happens.

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When I first got my GM 1000 i tried both coils and experienced the knock issues with the small coil an a little with the larger coil i took zip ties and zip tied the cable to the lower shaft approximately the first 4 inches of the cable just above the coil where the cable comes out to where the cable is real tight and can not move at all and I have had no issues since it is a pain in the butt to have to do this every time you switch coils and i just carry a supply of zip ties with me when I detect as I usually zip tie the cable all the way up the first two shafts  

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I did this with GPX coils and bought extra shafts so that I did not have to zip tie on two or three coils.  I have more coils than shafts so some of them I would Velcro instead of zip tie.  I've also secured the wire just before it goes into the battery to prevent movement.

That seems to be a 'known' issue with a loose coil wire.

Have the issues ever been more than that on the Monster?  (I still don't own a Monster but I've used one.)

Mitchel

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I have been securing the cable to to the lower shaft since the Fisher T10 days and I haven't had any trouble with Gm1000.

 

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