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Metal Detectors
Minelab
FBS/BBS/v3i/multi frequency info for the more technical minded.
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<blockquote data-quote="Narrawa" data-source="post: 173169" data-attributes="member: 3694"><p>I went through that some years back looking for the edge with my ExsplorerII....it didn't exist. The noise cancel frequency shift i think was explained by Carl in that thread somewhere..?.. the same way it was explained to me back in the day. It has far more influence on EMI effects than its ever going to have on target depth and response. Same for PIs when folks claim that manual tuning has a big impact on the depth and sensitivity of the PI. Again...its a way to control EMI than target response. Any gains had by adjusting the freq for better response, will be lost to the other gains like ground noise and EMI...... Nothing for nothing. </p><p></p><p>Comboed to a larger coil and higher manual freq adjust was a thought i had some time back.....larger coils for depth, yet adjusted for the higher end of the manual tune adjustment meant any significant gain to the larger coil by the way of sensitivity was lost to the other effects, mostly EMI control....you cant have both if the EMI level on the day/hr is in the realms of your manual tune frequency.? </p><p>Same for using a small coil and the lower end of the frequency scale.</p><p></p><p>At the end of the day....tune for best EMI cancellation....the small amount of freq shift gives bugger all gains to target response.</p></blockquote><p></p>
[QUOTE="Narrawa, post: 173169, member: 3694"] I went through that some years back looking for the edge with my ExsplorerII....it didn't exist. The noise cancel frequency shift i think was explained by Carl in that thread somewhere..?.. the same way it was explained to me back in the day. It has far more influence on EMI effects than its ever going to have on target depth and response. Same for PIs when folks claim that manual tuning has a big impact on the depth and sensitivity of the PI. Again...its a way to control EMI than target response. Any gains had by adjusting the freq for better response, will be lost to the other gains like ground noise and EMI...... Nothing for nothing. Comboed to a larger coil and higher manual freq adjust was a thought i had some time back.....larger coils for depth, yet adjusted for the higher end of the manual tune adjustment meant any significant gain to the larger coil by the way of sensitivity was lost to the other effects, mostly EMI control....you cant have both if the EMI level on the day/hr is in the realms of your manual tune frequency.? Same for using a small coil and the lower end of the frequency scale. At the end of the day....tune for best EMI cancellation....the small amount of freq shift gives bugger all gains to target response. [/QUOTE]
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Metal Detectors
Minelab
FBS/BBS/v3i/multi frequency info for the more technical minded.
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