Threshold Adjustment

[Cody]

I understand the threshold from an amplifier design point of view so have avoided that because I don

 

[dsurcy]

Cody,
I guess what I was trying to ask is.. if I drop my threshold one notch from hearing to not hearing.. say I hear it at 14 and I drop it to 13 (using an example you had mentioned).. then it seems to me.. that for a target sound to reach the "unheard" threshold and go just above it for me to detect would seem to be a smaller distance/jump than if I reduced my threshold to 0 (all the way off)... or maybe I'm not understanding what you mean when you say 0 threshold...

I was then trying to ask.. so.. if my threshold is only one "notch" below threshold... and assuming then.. that it would take less to reach and pass the threshold level.. if I increased sensitivity and/or gain.. that I may "regain" some of those targets that I may have missed using a "silent" search method..

I guess I'm making myself as clear as mud again..

Dan

 

[Cody]

You are absolutely correct. It is much different to drop it one or two clicks below our threshold than to drop it all the way to 0.

 

[Steve(MS)]

Dan, This is only my opinion on loss of Depth due to threshold and take into consideration that I use the original Explorer. I hunt mostly trashy areas to start with so keep that in mind also. I have hunted with threshold and just below threshold and I use just below threshold more because there is almost always something under my coil. I think depth loss due to just below threshold is minimal. The items that affect depth more in my opinion is too much disc., sensitivity, target masking, sweep speed,and ground minerals. I mentioned disc. in that group yet I have found some deep coins with -10(iron mask) or most of the screen blacked out. The lower conductors seem to be influenced(depth loss) by more disc. than higher conductors in my opinion. Of course the less disc you use the better but there are exceptions to that as well. There is nothing wrong with cranking up the disc., do some experimenting with it, just make a prog and keep iron mask screen @-16 so you can flip between them when you want to investigate a target. I use as little disc. as I can get by with though.
Steve(MS)

 

[Cody]

I agree with you which is what I have experienced. I have wondered why Minleab does not design a good circuit to hold the threshold just slightly below sound for silent search. It may be that they do and I don't realize it.

 

[dsurcy]

I believe I see what you are saying and when I think about it
I guess it makes sense.. apparently "deeper/fainter" targets
apparently do not have as accurate an "ID" factor... and by
discriminating too much may make them fall into the discrim.
area..
So, if I want a "quicker/less digging" exploration of an area
I may disc. more.. and be able to switch to IM -16 for further
review... and.. keeping in mind a future, more detailed examination
of the area would be in order... using less or no discrimination.

Thanks,
I will keep all this in mind.

Dan