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Gold Prospecting
Metal Detecting for Gold
DD coil in mono mode? = Confused
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<blockquote data-quote="Hawkear" data-source="post: 677179" data-attributes="member: 4728"><p>From memory the early SD Minelab detectors were designed to work out of the box with an 11” DD coil. Mono coils were also available for these models but there was no switch on the control box for DD or mono, you just changed coils. So SD detector pulses optimized for DD operation had no difficulty also operating mono coil.</p><p>With the GPs such as the 4500 which have a mono/DD switch it shouldn’t matter if it is switched to DD as that was the way the earlier SDs from which the GP series evolved. Reading Nenads comment, it may be that Minelab introduced the mono switch to provide a little less twitchiness to the mono signal.</p><p>If there is a subtle difference, I must give it a try to see if I can pick it. Should be easy enough once I find my next faint in ground target.</p><p>Regarding using DD coils in mono mode, one might wonder if there is a need for super small coils such as a Sadie if one already has a DD coil and can just use it in half size mode. I did very well with an Extreme years ago using the DD coil that way because mono performance on larger mono coils was problematic back then. Of course detector improvements since with the performance of mono coils have obviated the need to use DD coils as the prime coil and these days I never use mine, but there is one still sitting in the box.</p></blockquote><p></p>
[QUOTE="Hawkear, post: 677179, member: 4728"] From memory the early SD Minelab detectors were designed to work out of the box with an 11” DD coil. Mono coils were also available for these models but there was no switch on the control box for DD or mono, you just changed coils. So SD detector pulses optimized for DD operation had no difficulty also operating mono coil. With the GPs such as the 4500 which have a mono/DD switch it shouldn’t matter if it is switched to DD as that was the way the earlier SDs from which the GP series evolved. Reading Nenads comment, it may be that Minelab introduced the mono switch to provide a little less twitchiness to the mono signal. If there is a subtle difference, I must give it a try to see if I can pick it. Should be easy enough once I find my next faint in ground target. Regarding using DD coils in mono mode, one might wonder if there is a need for super small coils such as a Sadie if one already has a DD coil and can just use it in half size mode. I did very well with an Extreme years ago using the DD coil that way because mono performance on larger mono coils was problematic back then. Of course detector improvements since with the performance of mono coils have obviated the need to use DD coils as the prime coil and these days I never use mine, but there is one still sitting in the box. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
DD coil in mono mode? = Confused
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