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New 9" round 3 khz coil

T

TerryETex

New member
I just put the new coil on, 9" round 3 khz, It displays ID numbers higher than the stock 9" 7.5 coil. It also ground balances different than the stock coil. For example the 9" round 7.5 coil will ground balance between 35-45. While the 3 khz coil will display higher ID #'s and will ground balance at 9. A major difference between the coils.
Is this normal and what can I expect different from the 3 khz coil from the 7.5 khz coil?
 
How it responds is going to be a bit different for everyone, because specific magnetic/conductive minerals and their respective levels that effect your detector are unique to your area. What you describe is not uncommon, but "how much" is the variable. With GB numbers like you posted the 6" LF DD coil would be a distinct improvement over the 9" LF CC.

As far as what to expect...
You'll notice that high conductors like silver and copper will scream at you, and inversely, low conductors like iron and rusty junk will be easier to determine.
Say goodbye to those pesky rusted crown caps!
 
TerryETex said:
For example the 9" round 7.5 coil will ground balance between 35-45. While the 3 khz coil will display higher ID #'s and will ground balance at 9.
Click to expand...

OLH is correct in that there can be some differences. But I've never encountered such a dramatic difference between the ground phase of two coils of the same size and design, just different frequencies. I don't know if you were comparing them in an isolated location or were talking about numbers encountered during a hunt. So before we can help diagnose the circumstances, I'd suggest you locate a small area without any metal objects buried in the ground, mark an exact spot with a small stick or something, and run the test again. If you're getting that much difference, I'd have to question if the coil was working properly. Let us know what you find out and we'll see what we can come up with. JMO HH Randy
 
And along with what Randy said, it might be interesting to actually measure your mineralization as outlined in this post by BarnacleBill.
http://www.findmall.com/read.php?55,574329,574329#msg-574329

It may also be interesting to do a system reset at some point, as accumulative "glitches" can add up to some screwy behavior.
 
Thanks, will do.
 
Thanks Digger, I will do that.
 
Thanks for the information.
 
First I reset all the programs to factory presets. I unplugged and reinserted the 3 khz coil. I then did the ground mineralization by Barnicle Bill procedure and got the #'s 004659. I then ground balanced it and it came up 35 which according to the 7.5 khz coil is about right. I also got proper TID on coins according to the minelab chart. I think it is fixed. Thanks to you and Digger for your help. Terry
 
I also did a ground mineralization on my land and got a 003580 and it ground balanced at 32. Just an FYI.
 
:thumbup: Glad that you got it worked out Terry!

I have to run, so I can't comment on your measurement numbers at this time, but I'll get back to it later on.
 
I did that test with the 9" round 3 khz coil. Should I have done it with the 9" MF coil?
 
TerryETex said:
I did that test with the 9" round 3 khz coil. Should I have done it with the 9" MF coil?
Click to expand...
Actually, "yes". The stock 7.5 concentric coil is the benchmark.
Doing it with another coil can be revealing, but you need the benchmark to have something to compare against, and you need to be sure to measure the exact same spot when you do it. Also, be sure to measure both magnetic and conductive minerals, and post both sets of numbers.
 
Okay, I'll change back to the 7.5 khz and redo the test.
 
Is the magnetic and conductive minerals both covered by Barnicle Bill in that article? I might have missed something.
 
Yep, it's in there.
It's basically the same procedure to measure conductive minerals as the process you used to measure magnetic minerals, but it's done in Beach mode with Tracking OFF.
 
I'll be back tomorrow.
 
On the magnetic #'s I got an average of 006676 and conductivity #'s of an average of 000292.
 
Mine is usually only a few numbers different on ground balance.
 
As I recall from my notes, my Magnetic is a little lower, and my Conductive is a bit higher, which is about what I'd expect given our geographic locations.
 
My ground balance #'s change very little. They average 36.
 
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