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Author Topic:  Bump sensitivity  (Read 655 times)

Offline whitehunter

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Bump sensitivity
« on: March 12, 2018, 18:44 »
Struck my first pothole with the Nox on Saturday . Was a PMAT field day chasing gold and the first time i had used the Nox in our Tassie scrub , and the first time using the prospecting modes . I have had great success in paddocks , parks , beaches and sporting areas with this machine and still think it's a great machine for those areas . But , prospecting and relic detecting in the areas i hunt involve endless sticks and bracken fern , and this machine falses endlessly in this scenario , even when using sensitivity as low as 12 ! Used field 2 for some relics and found it was not much better , finding an 1888 halfpenny on a bulldozed track , but useless in the bush where i use my old MXT like a fern hook ! Even the Makro Gold and Nokta Relic perform well in this situation . So i will be reviewing my upcoming detector chop list , the MXT was always going to stay but i reckon the Makro might get a reprieve also . The Nox will get heavy usage where [in my opinion] it shines , beaches and parks , a bush basher at the moment it is not . 

Linkback: http://forum.kimbucktwo.com/index.php?topic=32618.0
  • Detector(s) owned/used: ebay cheapo , Coinmaster , White's mxt pro ,Minelab 2100 , Minelab Equinox 800 , White's Surf P I . Makro Gold Racer , Nokta fors Relic , Whites MX 5
  • Oldest find: 1854 penny , 1816 shilling , cartwheel penny , 1895 gold sovereign , 1842 Groat

Offline BrisGazza

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Re: Bump sensitivity
« Reply #1 on: March 12, 2018, 18:51 »
I found this a problem when testing a friends nox the other week , it seemed to be very bump sensitive on the thick grass , Gazza 
  • Detector(s) owned/used: Garrett A T Pro International,Garrett Pinpointer,Equinox 800
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Gazza

Offline whitehunter

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Re: Bump sensitivity
« Reply #2 on: March 12, 2018, 20:21 »
I found this a problem when testing a friends nox the other week , it seemed to be very bump sensitive on the thick grass , Gazza
You must have been in some pretty thick grass , mine has run sweet so far on grassed areas , but falses constantly from even tiny sticks only a couple of mill thick caught in the coil and every strike on standing bracken sounds of as well . I notice on D.P. forum this matter is being raised too . I feel like lowering the gain to 12 or less for quietness would probably be self defeating . Anybody that has experienced Tassie bush would know the level of scrub there is here , unfortunately where it's thick is where the goodies still are ! Lucky i have some spare alternative units .
  • Detector(s) owned/used: ebay cheapo , Coinmaster , White's mxt pro ,Minelab 2100 , Minelab Equinox 800 , White's Surf P I . Makro Gold Racer , Nokta fors Relic , Whites MX 5
  • Oldest find: 1854 penny , 1816 shilling , cartwheel penny , 1895 gold sovereign , 1842 Groat

Offline Justafisho

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Re: Bump sensitivity
« Reply #3 on: March 12, 2018, 20:28 »
Do you lose much depth by lowering the gain? 
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Offline FSH00

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Re: Bump sensitivity
« Reply #4 on: March 12, 2018, 21:38 »
Try raising the ground balance a little from std setting see if that helps.
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Offline whitehunter

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Re: Bump sensitivity
« Reply #5 on: March 13, 2018, 07:50 »
Do you lose much depth by lowering the gain?
Will have to do some testing but using less than half the available gain would have to have some depth loss i think . And it still was noisy at 12 .
  • Detector(s) owned/used: ebay cheapo , Coinmaster , White's mxt pro ,Minelab 2100 , Minelab Equinox 800 , White's Surf P I . Makro Gold Racer , Nokta fors Relic , Whites MX 5
  • Oldest find: 1854 penny , 1816 shilling , cartwheel penny , 1895 gold sovereign , 1842 Groat

Offline whitehunter

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Re: Bump sensitivity
« Reply #6 on: March 13, 2018, 07:52 »
Try raising the ground balance a little from std setting see if that helps.
Ok that's something else to play around with . I did try various recovery speeds with little improvement .
  • Detector(s) owned/used: ebay cheapo , Coinmaster , White's mxt pro ,Minelab 2100 , Minelab Equinox 800 , White's Surf P I . Makro Gold Racer , Nokta fors Relic , Whites MX 5
  • Oldest find: 1854 penny , 1816 shilling , cartwheel penny , 1895 gold sovereign , 1842 Groat

Offline Justafisho

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Re: Bump sensitivity
« Reply #7 on: March 13, 2018, 08:16 »
Will have to do some testing but using less than half the available gain would have to have some depth loss i think . And it still was noisy at 12 .
I'll be interested to hear the results. Lowering gain doesn't always mean less depth. I have a v3i (possibly the first multi frequency machine) and rx gain can quite often be lowered to deal with either emi, "bump" falsing or the falsing sometimes heard at the end of one's swing(change of direction) and still be getting quite deep targets. Does the nox have sensitivity and gain, or just gain? There's a really good document that's been put together for the v3i that explains all this in depth(and let's face it, whilst all machines have different quirks, they still all operate with the same principles) . I'll look for it tonight, it could even be on here somewhere. Apologize of I'm teaching you to suck eggs here, but learning the difference between gain and sensitivity changed the way I set my machines up. 
  • Detector(s) owned/used: Whites V3i -CTX3030- AT Pro- XP Deus-Garrett Pro pointer- Whites TRX Pinpointer
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Offline Clegy

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Re: Bump sensitivity
« Reply #8 on: March 13, 2018, 12:10 »
I've found that if I am having Bump issues its one of 2 things.

Too much grunt into the coil making it very unstable, normally turning down the POWER rather sensitivity sets it right. More susceptible on higher frequencies I noticed too. So maybe drop the KHZ a bit as well. I explained it once as like having too much torque it makes it a bit twitchy at times. LOL

Other thing and I noticed this on my PI Beach machine when I had it wound up a bit. TINY vibrations of the coil cable where being picked up by the machine when I hit small rocks and shells. It took me 2 months of trying different stuff other than taking the grunt out, to get it right.
Something said re wind the cable and I did with a much tighter cable holder closer to the bottom. Problem solved and I felt a little dumb as well which was pretty standard for me.

Happy Hunting

Clegy

P.S Is the coil flexing at all? It could be vibrations from that too. Just an after thought.
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Offline ivanll

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Re: Bump sensitivity
« Reply #9 on: March 13, 2018, 13:24 »
I'll be interested to hear the results. Lowering gain doesn't always mean less depth. I have a v3i (possibly the first multi frequency machine) and rx gain can quite often be lowered to deal with either emi, "bump" falsing or the falsing sometimes heard at the end of one's swing(change of direction) and still be getting quite deep targets. Does the nox have sensitivity and gain, or just gain? There's a really good document that's been put together for the v3i that explains all this in depth(and let's face it, whilst all machines have different quirks, they still all operate with the same principles) . I'll look for it tonight, it could even be on here somewhere. Apologize of I'm teaching you to suck eggs here, but learning the difference between gain and sensitivity changed the way I set my machines up.
I have been using real VLF Multi Frequency since 1993 and waterproof since 1996, have absolutely  No Need to change.
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Offline GemQ

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Re: Bump sensitivity
« Reply #10 on: March 13, 2018, 13:55 »
Be interested to see a video showing this. Haven’t been a major issue with me and I know from testing gold coils that it can be very much driven from the individual. Some run noisy and hot, some like it quiet as a mouse.
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Offline whitehunter

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Re: Bump sensitivity
« Reply #11 on: March 13, 2018, 21:04 »
Thanks for all the replies . When i shake this awful flu i have i will try a couple of your suggestions but i think i may have found this machines limitations in my bush hunting scenario .
  • Detector(s) owned/used: ebay cheapo , Coinmaster , White's mxt pro ,Minelab 2100 , Minelab Equinox 800 , White's Surf P I . Makro Gold Racer , Nokta fors Relic , Whites MX 5
  • Oldest find: 1854 penny , 1816 shilling , cartwheel penny , 1895 gold sovereign , 1842 Groat

Offline blueyonder

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Re: Bump sensitivity
« Reply #12 on: March 14, 2018, 08:27 »
 i think i may have found this machines limitations in my bush hunting scenario .
  I hope not!...It's pretty much the only type of hunting I do. I've only had the chance to do a quick hunt with the Nox and must say I did not do too well..a lot of falsing on twigs and around clumps of fern. Quite a lot of TDI numbers showing up with no tones to match. Only found a few diggable signals (only coins were 2 threepences) whereas my brother scored 15 coins and lots of junk with his new Nox. He was always a minelab type while I have only used the A.T Pro on land.
I'm sure I'll be able to tune it to do a lot better given time and tips from you lot..cheers..Dave
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Offline NewSouthCroweater

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Re: Bump sensitivity
« Reply #13 on: March 14, 2018, 11:19 »
Re. Bump Sensitivity
I hope its ok to put a link to another forum
Steve and others here have discussed this bump issue - hopefully you can find and answer in the threads there
good luck :)

http://www.detectorprospector.com/forum/topic/5824-equinox-prospecting-work-around/?tab=comments#comment-61297

http://www.detectorprospector.com/forum/topic/5758-equinox-micro-nuggets/?tab=comments#comment-60495
« Last Edit: March 14, 2018, 11:21 by NewSouthCroweater »
  • Detector(s) owned/used: Minelab Equinox800, CTX3030, X-Terra70, Excalibur II, E-Trac, Garrett Ace250, Garrett ProPointer, Pistol Probe, Fisher F-Pulse, SitoScoop
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