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Steve Herschbach

Reports Of GM1000 5" Coil Touch Sensitivity

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Steve Herschbach    7,491

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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Norvic    1,124

Have not experienced this problem with the 5". 

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ophirboy    44

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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kiwijw    1,337

I have & do & also with the 10x6 coil but not as bad with the 10x6. I don't think it is too much of a secret that I was having this touch sensitive issue. Admittedly I try to run in manual sensitivity 10 & only because the ground allows me to. Our ground is insanely mild. No interference from the ground. It is only when I slightly bump or scuff the coil I get the falsing. Otherwise all is good. I would Rather have the high sensitivity to the tiny gold than sacrifice that sensitivity at the cost of missing those signals & so I just manage it with very careful coil placement & control. Good coil control is not a bad habit to get into any way. Same coil control I practice with the Zed. I have tried taping the coil cable & it didn't help me & it took away the flexibility of being able to alter the tilt angle of the coil. In the places I put that little coil I am constantly altering the coils angle to keep it parallel to the surface I am sweeping it over or tilting it to get the thin edge into a crevice.  That was more important to me so the tape didn't last 5 minutes. Some of you may say I didn't tape it down far enough. Shouldn't have to tape it at all. IMHO

 3536o1i.jpg

 

This video is of the 10x6 coil hitting on a signal that was originally found with the Zed. pin pointed with the GM 1000 & two more bits of small gold recovered with the GM 1000 from the Zed's dig out dirt. Manual 10 sensitivity, Deep All Metal Mode. You will notice slight falsing while the coil is hitting the schist while I am showing the settings & prior to me poking the coil into the crevice to get the hit. Falsed a bit when I kicked the coil to tilt it up so I could poke it in the crevice. Other wise by careful coil control all is good. Even on sweeping over the two signals in the dig out pile & not touching any thing it ran fine. 

 

This video is of the 5" coil & a lot more touchy on a tiny bit of gold. I started in Auto+ sensitivity, Deep all metal mode. Then Iron reject mode. You will notice the probability meter reading is a bit flickery but was stronger & more consistent to the non ferrous side. It is a tiny bit of gold & when the gold is bigger the reading is a lot more favorable to the non ferrous side of the indicator. At the end I go into manual 10 sensitivity & show a bit of the touch issue of the coil but again with careful coil control & placement all is good & no gold is safe. :biggrin: Then the camera battery died. But you will get the point.  So is it a coil issue?? I just manage it best I can & I have yet to be skunked with the GM 1000. In 20 specific detecting outings with just the GM 1000 targeting the most likely spots, exposed bedrock, I have close to 100 small/tiny bits of gold. 92 to be precise. So it is working well for me.

Cheers

Good luck out there

JW :smile:

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kiwijw    1,337
57 minutes ago, ophirboy said:

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 . 

 

Just saw your post after putting up mine. You are spot on the money & what you say is what I experience.

Good luck out there

JW :smile:

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ophirboy    44

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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Northeast    196

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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Cabin Fever    155

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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kiwijw    1,337

Hi there Cabin Fever, In my experience with my gold detectors, & it doesn't seem to matter what make or model, knocking, bumping, or just slightly touching the coil cable where it leaves the coil on any bush etc results in falsing. Hence the cable clips & velcro wraps to hold the cable snug to the lower shaft. Even up where the cable entered the control box of the Minelab PI's to stop falsing from slight movement of the cable from bumping on the side of your body when swinging.

With the Gold Monster I did knock the sensitivity back to lessen the falsing but I was also knocking out those faint tiny gold signals. So I now leave the sensitivity up & just manage the coil knock falsing by very careful coil control. Makes you double scan on a lot of those type signals, but you soon know it was a knock signal as opposed to a good hit signal. Can be a bit of a pain but that is just how it is. Went on a hell walk mission yesterday. Mountain goat territory. Back pack loaded with all the detecting gear, thermos of coffee, smoko bag of tucker & two detectors. Gold Monster semi striped down & strapped to the side of the pack & the Zed over my shoulder. The old body not liking these kind of excursions much these days.  :rolleyes: But I still love getting up into these kind of places, probably because no else does. There was a stretch of bedrock where I got some small gold with my 4500 & the little 8x6 Nuggetfinder Sadie coil. I just knew there had to be some more tiny gold that the 4500 wasn't getting. So Gold Monster on manual 10 sensitivity, deep all metal mode & very careful coil sweeping I managed 18 tiny bits of gold. Post to come but just thought I would dangle the carrot. :biggrin:

The no threshold does take a bit of getting comfortable with. The little Monster does grow on you, no two ways about it. It is a bag of fun.  Cheers.

Good luck out there.

JW :smile:

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Reno Chris    1,067

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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