false signals over open hole

[utahshovelhead]

I watched a bud get a false signal over open holes (about 16 inches deep) with his 3030. There would be no signal, you dig the hole, and then there is a signal. What do you suggest to reduce this or mask what is apparently a negative signal or reading, after moving away soil that is magnetized or mineralized?

Any suggestion would be appreciated.

 

[coondog]

I would first tell my bud to fill the hole back in to see if that clears up the signal if so then I would tell him to stop digging deep a_s holes where there is no signal to start with.




Sorry but someone was going to say it. Seriously thou it would be nice to know what's going on there.

 

[JamesM]

I'm confused....Why would you dig a hole (especially a 16" hole), where there is no signal?

 

[CZconnoisseur]

My first guess is something ground balance related

 

[utahshovelhead]

LOL, we noticed that when he would recheck the holes of dug targets that there was always a hit on the deep holes. Hed have me come and check it with my E trac and I would find no target. After a few of these we wondered why that would be happening. He is using his 17 inch coil and yes...the hole is 16 inches at least. if your not digging that deep once in a while, well...what can I say.


good luck.

 

[Rick(ND)]

Over the years I have seen this on many detectors myself, its not really a signal but a increase in threshold and feel it has something to do with the void under the coil as it has only air then the ground. Some of the reasons I feel is did he have his ground balance turned on or was it in the auto tracking, if it was on and he didn't ground balance I am sure this can be the cause of it more so. Was this signal a good solid signal with the numbers locking on, I feel it wasn't and just a slight threshold change acting like a signal.
I tried using my ground balance and ground balancing to try to get a better signal with the CTX, but being our ground is not real mineralized I found I did better with the ground balance turned off.

This is my 2 cent worth and like I say I have seen it on some detectors that goes back in the 70s and felt it was the void of having only air under the coil, just like picking up our coil on some of the old detectors that didn't have automatic tuning as we got a louder threshold making it sound like a signals. Those that have used the older detectors know what i am talking about as on the end of a swing and you lift the coil slightly it sound like you got a signal at the end of your swing.

Rick

 

[JamesM]

My first thought was also that manual ground balance had been activated, or that the sens is cranked up to high. Without knowing the settings that were being used, there is no way to know. You could upload the .MLF file (the mode that he was using) and let one of us have a look at it.

 

[utahshovelhead]

Great advice, this forum rocks with lots of good info. I do not myself have a 3030 but ill send him the post and see what he has to say.
thank you.