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Metal Detectors
Minelab
Minelab GPX6000 release, general information and questions
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<blockquote data-quote="mbasko" data-source="post: 568333" data-attributes="member: 4485"><p>We're a fair bit off topic here OGT. I've seen that MPF paper before but IMO khz isn't a good measure for describing PI detectors (not sure why Minelab used it in that MPF paper - maybe to highlight how quick MPF is compared to other PI's?). </p><p>Frequency in a VLF (constant sine wave - khz) & PI (tx, shut off, rx - pulses/sec) are very different animals. </p><p>Putting PI pulse rate as khz can confuse people into thinking that it's as simple & the same as changing the khz on a VLF to go deeper or to get more sensitivity. </p><p>It can be in some instances but there's a lot more going on too. </p><p>Where MPF succeeded IMO (I'm no tech) with the faster pulse rate is with MPF they were able to nearly instantaneously switch off the Tx then quickly switch to Rx without introducing ground noise. Something they hadn't been able to do before.</p><p>What you say here "if they could change the frequency maybe they could get bigger deeper targets instead of small shallow targets on heavy mineralised soils" isn't wrong. In my last post I just tried to show that they already do it with the GPX in a PI detector which is basically a multi frequency or multi pulse rate detector (MPS).</p><p>Could they put more timings into the SDC for deeper gold or even just more options to enhance it's forte? Most likely they could. Will they, probably not for the same reasons I reckon MPF won't show up in the GPX6000 (if it did I'd be pleasantly surprised).</p></blockquote><p></p>
[QUOTE="mbasko, post: 568333, member: 4485"] We're a fair bit off topic here OGT. I've seen that MPF paper before but IMO khz isn't a good measure for describing PI detectors (not sure why Minelab used it in that MPF paper - maybe to highlight how quick MPF is compared to other PI's?). Frequency in a VLF (constant sine wave - khz) & PI (tx, shut off, rx - pulses/sec) are very different animals. Putting PI pulse rate as khz can confuse people into thinking that it's as simple & the same as changing the khz on a VLF to go deeper or to get more sensitivity. It can be in some instances but there's a lot more going on too. Where MPF succeeded IMO (I'm no tech) with the faster pulse rate is with MPF they were able to nearly instantaneously switch off the Tx then quickly switch to Rx without introducing ground noise. Something they hadn't been able to do before. What you say here "if they could change the frequency maybe they could get bigger deeper targets instead of small shallow targets on heavy mineralised soils" isn't wrong. In my last post I just tried to show that they already do it with the GPX in a PI detector which is basically a multi frequency or multi pulse rate detector (MPS). Could they put more timings into the SDC for deeper gold or even just more options to enhance it's forte? Most likely they could. Will they, probably not for the same reasons I reckon MPF won't show up in the GPX6000 (if it did I'd be pleasantly surprised). [/QUOTE]
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Metal Detectors
Minelab
Minelab GPX6000 release, general information and questions
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