readings of 48 on the 705...

[robo]

Curious as to what your digging up with readings of 48. Here is my dilema. I've been running the 3 khz. Coil on my 705. I usually get a gb reading between 18 to 20. When Ipush my sensitivity up past 20 I am getting constant tones reading 48. False signals for sure. She seems to run stable at sensitivity in the 18 to 20 range. Do you think my coil could be bad? I only get readings of 48 when I bump up the sensitivity. Any way of telling if my coil could be bad?

 

[Old Longhair]

Short of sending it in, or a direct comparison with and against an identical setup, I don't know how you could know for sure.

I have sites that I go to where ground phase numbers are low, and if I try to run too hot I get a lot of falsing. I've found that 48's are either phamtoms or iron at those sites, and I cool it down so that the few I get are easy to ignore.

 

[Digger]

48 can indicate a big chunk of silver or wrap around iron. The best way to sort them out is by implementing multiple tones, minimal discrimination, and listen for the harmonic tones that are produced by iron. As to maybe having a bad coil, if you have another concentric coil, you could make the comparison to see if it does the same thing. Based on my personal experience, having a ground phase of 18 - 20 is pushing the limits of the mineralization level that a concentric coil is able to effectively handle. But honestly, if it only happens with the Sensitivity set up high, I'd guess you are bouncing too much signal back toward the coil. Your Sensitivity setting should be relative to the site you're hunting. Moderately mineralized soil and lots of space between targets will accommodate a high Sensitivity setting. Highly mineralized soil and multiple targets in the ground have a tendancy to bounce the signal back at you when you set the Sensitivity too high. This causes instability and falsing. For a more thorough explanation on Sensitivity, check out pages 14 and 15 of the eBook. HH Randy

 

[BH_Landstar_]

46 - 48 can also be a big chunk of gold (18 - 24K), like this one I found last year !