Mike Hillis
Well-known member
Thought I would share a little information about using the Bigfoot coil on the V3.
There are a couple of issues with using the Bigfoot coil on the V3. One of them is that the high frequency 22.5 kHz doesn't work properly with the coil. It works fine with the low 2.5kHz frequency and it works fine with the 7.5 kHz frequency. But it acts pretty funky with the high frequency.
If you put the Bigfoot coil on, with three frequency Best Data option selected, and pass a nickel over the coil, You will most likely get a target id number of 54.
If you then switch to the single frequency 7.5 kHz mode, and pass the nickel over the coil, you will most likely get a target id number of 18. What is the difference between the two target id numbers? 54 = 18 x 3. That is interesting!
I took some of my gold ring finds and did a simple test. I put the V3 in the 7.5 kHz single freq mode.
Ring #1 gives a VDI of 6
Ring #2 gives a VDI of 8
Ring #3 gives a VDI of 11
Ring #4 gives a VDI of 15
A modern nickel gives a VDI of 18
A modern tab gives a VDI of 25
A small silver earring gives a VDI of 36
A zinc penny gives a VDI of 56
Then switch to 22.5 kHz single freq mode.
Ring #1 gives a VDI of 18 (3x 6 )
Ring #2 gives a VDI of 24 (3x 8 )
Ring #3 gives a VDI of 33 (3x11 )
Ring #4 gives a VDI of 45 (3x15 )
A modern nickel gives a VDI of 54 (3x18 )
A modern tab gives a VDI of 75 (3x2 5 )
A small silver earring gives a VDI of 91
A zinc penny moved into the iron range, I think it was a -86.
On low conductor objects on which the 22.5 kHz is the dominant frequency, it will display a target id number that is 3 times the 7.5kHz value.
On low conductor objects on which the 22.5 kHz is not the dominant frequency, it will still display target id number that is significantly higher but not equal to the 3x value.
So how do I use this information?
When using the Bigfoot with the 3 freq Best Data mode you really need to see the dominate frequency on low and middle target id numbers to properly id the target. If the 22.5kHz shows to be the dominant frequency, then you can divide it by three and get a normal id number. If the 7.5 kHz frequency is the dominant frequency, then you know the id number can stand alone, no conversion is necessary.
For example, I get a id number of 54. I toggle over to Analyze or Pinpoint mode and see the dominant freq is 7.5 kHz. Ok...that a zincer or screwcap or something in that range.
For example, I get a id number of 54. I toggle over to Analyze or Pinpoint mode and see that the dominant freq is 22.5 kHz. Ok, I do the divide by 3 conversion and know I have nickel range target.
For example, I get a id number of 38. That is a low conductor target id number, I don't have to see the freq to know that, so I do the divide and know I have a foil range target.
By hunting in the Analyze mode as the primary hunt mode you have both the target id number and the dominant frequency available at a single glance.
Set your audio and disc settings accordingly.
HH
Mike
There are a couple of issues with using the Bigfoot coil on the V3. One of them is that the high frequency 22.5 kHz doesn't work properly with the coil. It works fine with the low 2.5kHz frequency and it works fine with the 7.5 kHz frequency. But it acts pretty funky with the high frequency.
If you put the Bigfoot coil on, with three frequency Best Data option selected, and pass a nickel over the coil, You will most likely get a target id number of 54.
If you then switch to the single frequency 7.5 kHz mode, and pass the nickel over the coil, you will most likely get a target id number of 18. What is the difference between the two target id numbers? 54 = 18 x 3. That is interesting!
I took some of my gold ring finds and did a simple test. I put the V3 in the 7.5 kHz single freq mode.
Ring #1 gives a VDI of 6
Ring #2 gives a VDI of 8
Ring #3 gives a VDI of 11
Ring #4 gives a VDI of 15
A modern nickel gives a VDI of 18
A modern tab gives a VDI of 25
A small silver earring gives a VDI of 36
A zinc penny gives a VDI of 56
Then switch to 22.5 kHz single freq mode.
Ring #1 gives a VDI of 18 (3x 6 )
Ring #2 gives a VDI of 24 (3x 8 )
Ring #3 gives a VDI of 33 (3x11 )
Ring #4 gives a VDI of 45 (3x15 )
A modern nickel gives a VDI of 54 (3x18 )
A modern tab gives a VDI of 75 (3x2 5 )
A small silver earring gives a VDI of 91
A zinc penny moved into the iron range, I think it was a -86.
On low conductor objects on which the 22.5 kHz is the dominant frequency, it will display a target id number that is 3 times the 7.5kHz value.
On low conductor objects on which the 22.5 kHz is not the dominant frequency, it will still display target id number that is significantly higher but not equal to the 3x value.
So how do I use this information?
When using the Bigfoot with the 3 freq Best Data mode you really need to see the dominate frequency on low and middle target id numbers to properly id the target. If the 22.5kHz shows to be the dominant frequency, then you can divide it by three and get a normal id number. If the 7.5 kHz frequency is the dominant frequency, then you know the id number can stand alone, no conversion is necessary.
For example, I get a id number of 54. I toggle over to Analyze or Pinpoint mode and see the dominant freq is 7.5 kHz. Ok...that a zincer or screwcap or something in that range.
For example, I get a id number of 54. I toggle over to Analyze or Pinpoint mode and see that the dominant freq is 22.5 kHz. Ok, I do the divide by 3 conversion and know I have nickel range target.
For example, I get a id number of 38. That is a low conductor target id number, I don't have to see the freq to know that, so I do the divide and know I have a foil range target.
By hunting in the Analyze mode as the primary hunt mode you have both the target id number and the dominant frequency available at a single glance.
Set your audio and disc settings accordingly.
HH
Mike
