mcjtom Posted December 6, 2021 Share Posted December 6, 2021 On startup, the detector performs ‘Automatic Noise Cancel’, which I imagine shifts the frequencies mixture in order to try to minimize some types of EMI noise. Does it matter what the Sensitivity is set to when this procedure is invoked? e.g. if Sensitivity is low enough for the detector not to see the EMI in some channels, would the Automatic Noise Cancel also not see noise in those channels and potentially choose them as being OK, or would the procedure ignore the Sensitivity setting altogether? Link to comment Share on other sites More sharing options...
mcjtom Posted December 6, 2021 Author Share Posted December 6, 2021 Also, would the different Vanquish ‘modes’ require different Automatic Noise Cancel calibrations? My understanding is that they differ in recovery times, not channel weighing like in the Equinox. Link to comment Share on other sites More sharing options...
PimentoUK Posted December 6, 2021 Share Posted December 6, 2021 It's safe to assume that it's going to examine a more 'raw' version of the signal coming from the coil, and any sensitivity, discrimination, notching, volume, or hyperchromatic birefringency settings you have in place will be ignored. Please show us some old coins and ancient Thai relics. Link to comment Share on other sites More sharing options...
phrunt Posted December 6, 2021 Share Posted December 6, 2021 I found with my Minelab GPX having the gain on maximum with the noise cancel helps, so I just do it with every detector. I figure the more EMI the detector sees the best chance it has of moving away from it so on my Vanquish and Equinox I always have my gain on maximum for the noise cancel process. Not sure if it helps, but it can't hurt at the same time. 2 Link to comment Share on other sites More sharing options...
mcjtom Posted December 7, 2021 Author Share Posted December 7, 2021 Thanks! But, now I'm properly confused by this article: www.minelab.com/asia/community/treasure-talk/four-tips-to-help-your-detector-auto-tune-or-noise-cancel I'm not sure how to read it, but it seems to suggest that both the sensitivity and the signal sampling resolution affect Auto Noise Cancel (so the signal may not be that raw)... The advise is to enhance the noise (I would think higher Sensitivity and faster Recovery Speed on VLF) before running the Auto Noise and than go back to proper settings - at least that’s what I understood. p.s. Lots of Thai coins, artifacts, and gold, as soon as I figure out how to turn it on... Promise! 🙂 Is there a way to field test it somehow - does the Auto Noise use ‘raw’ signal or the one modified by some user’s settings? I can’t hear much difference, but that doesn’t mean there is none… Link to comment Share on other sites More sharing options...
PimentoUK Posted December 7, 2021 Share Posted December 7, 2021 "I'm properly confused" You will be if you look at an article describing how to noise-cancel a completely different detector ... and a PI one, especially. Link to comment Share on other sites More sharing options...
mcjtom Posted December 7, 2021 Author Share Posted December 7, 2021 But the article does say that the principle should apply to VLF detectors as well? Do you think that Minelab VLFs do Noise Cancel differently? Link to comment Share on other sites More sharing options...
phrunt Posted December 7, 2021 Share Posted December 7, 2021 You'll never get to understand how it works, just follow the theory of higher gain gives more chance of tuning out EMI as it is affected by more EMI and you should be fine, it's what that article alludes to also. I've been doing highest sensitivity noise cancel on my VLF's and I think it does a good job. Link to comment Share on other sites More sharing options...
Johnnysalami1957 Posted December 8, 2021 Share Posted December 8, 2021 Maybe the machine defaults to max sens during the noise cancellation,,,,,,IDK. Link to comment Share on other sites More sharing options...
phrunt Posted December 8, 2021 Share Posted December 8, 2021 22 minutes ago, Johnnysalami1957 said: Maybe the machine defaults to max sens during the noise cancellation,,,,,,IDK. If it doesn't it should, good idea! 1 Link to comment Share on other sites More sharing options...
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