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Because in Mono timing, the DD coil runs like a Mono, 11 inch dd, now a 5 1/2 inch mono....1 side of coil working
DD coil in mono mode? = Confused
- Thread starter Mick64
- Start date
Help Support Prospecting Australia:
Yes, I'm confused. "Always use DD mode when using mono coils??" I've always read Mono for a Mono coil or Mono with a DD coil as mentioned above. Maybe you found all the nuggets left with your 4500. I haven't found anything with mine but find plenty of small stuff with SDC
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.
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.
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Madtuna, has the correct reply. I never used a DD with any of my Minelabs but did once see someone with a DD who always switched to Mono to pinpoint signals.
I put the DD on my 4500 and the threshold was so even and quiet and didn't seem right. Fixed, Normal and Special, Deep, DD and tried Sharp and Sensitive Extra. Would not get a Rx signal at all on a 0.34gm piece of gold. I put Iron discrimination on 5. It would get a signal on cans, scrap iron and my pick. So I am i right scanning and unless I get a good return there's nothing there. It was strange not digging anything at all.
You didn't accidentally put it in Cancel?
No, checked it all the time
There was a sound in the thresh hold and like I said it was just so smooth no matter what I put the Rx Gain on really. That's why I thought it was weird and I had something wrong.
