dave the ferret
New member
Getting to know how this machine works now,but how do you use ground probe readings with rx are we looking for bad ground readings with this in order to gain max depth with the machine? the ferret.........................
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Gound probe
- Thread starter dave the ferret
- Start date
If you are referring to the rx gain suggestion in the sensitivity setting on the V3, not the V3i, it has been found unreliable and was removed from the programming upgrade with the "i" version software. It has been stated here to set the gain as high as you feel comfortable with AS long as you don't get interference.
This thread gives about the best info you can find:
http://www.findmall.com/read.php?66,1400678,1400832#msg-1400832
This thread gives about the best info you can find:
http://www.findmall.com/read.php?66,1400678,1400832#msg-1400832
Larry (IL)
Well-known member
That is something that I haven't spent much time with, I guess because I haven't heard of any practical use for the readings yet. 
Neil in West Jersey
Active member
Larry (IL) said:That is something that I haven't spent much time with, I guess because I haven't heard of any practical use for the readings yet.
I use it occassionally if I am having trouble with depth. I will sometimes look at the signal loss. Generally if it is higher than 25% or so I may need to make adjustments. I go more by my instincts.
dave the ferret
New member
Thanks for info guys via theads listed above,its just what I needed to know. The ferret........
Ground Probe
Ground should fall between 0 and 180 degrees. In air, when you zero the detector, you will see phases of both positive and negative values - those are just noise and don't pay attention to them. If you are getting a negative phase for any of the frequencies when you lower the loop to the ground however, you probably have an overload problem. Most ground that we see is 178 (-94) to 165 degrees except salt which falls close to 90 degrees (VDI 0).
Nonferrous targets (coins and such).VDI 0 - +95
The VDI reading is converted from the ground phase normalized to standard VDI units. It's either going to be from the strongest signal if the detector is running best data, or the average of the two strongest signals if correlate is selected. If you have ground coming in at -94(VDI) with a signal strength of 2% and another ground coming in at -91 with a signal strength of 7%, it would seem to me that the ground coming in at -91 is more mineralized even though it is a less negative VDI. 0-10%=low mineralization, 11-25%=moderate and 25% on up = high/very high. The lower the mineralization, the slower one should sweep - which may mean a lower filter should be selected. The phase tells you composition (between purely ferrous and purely salt), while the signal strength tells you the concentration (more mineralized).
Ground should fall between 0 and 180 degrees. In air, when you zero the detector, you will see phases of both positive and negative values - those are just noise and don't pay attention to them. If you are getting a negative phase for any of the frequencies when you lower the loop to the ground however, you probably have an overload problem. Most ground that we see is 178 (-94) to 165 degrees except salt which falls close to 90 degrees (VDI 0).
Nonferrous targets (coins and such).VDI 0 - +95
The VDI reading is converted from the ground phase normalized to standard VDI units. It's either going to be from the strongest signal if the detector is running best data, or the average of the two strongest signals if correlate is selected. If you have ground coming in at -94(VDI) with a signal strength of 2% and another ground coming in at -91 with a signal strength of 7%, it would seem to me that the ground coming in at -91 is more mineralized even though it is a less negative VDI. 0-10%=low mineralization, 11-25%=moderate and 25% on up = high/very high. The lower the mineralization, the slower one should sweep - which may mean a lower filter should be selected. The phase tells you composition (between purely ferrous and purely salt), while the signal strength tells you the concentration (more mineralized).