I had a couple emails asking me to repost the target ID chart that I made a few months ago. I will attach it to this post. The text color used in making the chart corresponds to the color of that specific X-Terra. I will also restate a post I made awhile back concerning the number variance with the 7.5 kHz coil compared to the 18.75 kHz coil. This particular post was made while using the X-50, so keep in mind that the target notch segment number will vary with the X-30 or X-70. As I have stated several times, it is best to check your detector with multiple targets (air tests) to determine your target ID numbers. But, this will give you a general idea. HH Randy
I found the visual IDs to vary between the coils. On my X-50, half dollars read 45 on the stock 7.5 Khz coil, but read 42 on the higher freq 18.75 concentric coil. Quarters read 42 on the stock coil and 39 on the higher freq coil. Clad dimes read 36 on the stock coil and 33 on the higher coil. Oddly enough, nickels and zincs are the same on each. In all instances, as I increased the sweep speed and increased the depth, numeric readings became less consistent. Slowing the coil down to what some other Minelab hunters might consider normal, will not respond to some of the smaller targets. The X-Terra must be swept fairly quickly to maximize the potential.
Round tabs read 15 on each coil. Small square tabs read 27 on each coil. But, as I increased the depth, the numbers became jumpy and fluxuated from 24- 27. Larger square tabs read 24 on both coils. Screw caps read anywhere from 18 - 27 on the high freq coil and those tested read solidly as 27 on the stock coil. An old 2 cent piece read 33 on the stock coil and 30 on the higher coil. Several IH cents that read a consistent 27 on the higher freq coil gave readings of 27 and 30 on the stock coil. Silver dimes read one of 30, 33 or 36 on the higher freq coil (depending on the specific dime). But were each one notch higher on the stock coil with readings of 33, 36 and 39. A large men's gold ring read 18 on both coils. Depth between the two was similar at 12 - 13 inches of air. A very small lady's gold ring read 15 on both and the higher freq coil did have a slight edge in depth of detection.
What do I make of all this???? It seems to me that, once you get target numeric readings of 30 or more, the stock coil will provide a reading "one notch higher" than the higher frequency coil. In other words, 45 on the stock coil became 42 on the higher freq coil. 42 became 39. 36 became 33. But, once you got to 30 and below, they were pretty consistent with each other.
I found the visual IDs to vary between the coils. On my X-50, half dollars read 45 on the stock 7.5 Khz coil, but read 42 on the higher freq 18.75 concentric coil. Quarters read 42 on the stock coil and 39 on the higher freq coil. Clad dimes read 36 on the stock coil and 33 on the higher coil. Oddly enough, nickels and zincs are the same on each. In all instances, as I increased the sweep speed and increased the depth, numeric readings became less consistent. Slowing the coil down to what some other Minelab hunters might consider normal, will not respond to some of the smaller targets. The X-Terra must be swept fairly quickly to maximize the potential.
Round tabs read 15 on each coil. Small square tabs read 27 on each coil. But, as I increased the depth, the numbers became jumpy and fluxuated from 24- 27. Larger square tabs read 24 on both coils. Screw caps read anywhere from 18 - 27 on the high freq coil and those tested read solidly as 27 on the stock coil. An old 2 cent piece read 33 on the stock coil and 30 on the higher coil. Several IH cents that read a consistent 27 on the higher freq coil gave readings of 27 and 30 on the stock coil. Silver dimes read one of 30, 33 or 36 on the higher freq coil (depending on the specific dime). But were each one notch higher on the stock coil with readings of 33, 36 and 39. A large men's gold ring read 18 on both coils. Depth between the two was similar at 12 - 13 inches of air. A very small lady's gold ring read 15 on both and the higher freq coil did have a slight edge in depth of detection.
What do I make of all this???? It seems to me that, once you get target numeric readings of 30 or more, the stock coil will provide a reading "one notch higher" than the higher frequency coil. In other words, 45 on the stock coil became 42 on the higher freq coil. 42 became 39. 36 became 33. But, once you got to 30 and below, they were pretty consistent with each other.
Just remember that ground makes a difference. I found that my mineralized ground did just the opposite. The high freq coil gave a higher number than the stock coil on high conductive targets. For the most part the change was only one notch. I was grateful that it didn't wrap targets back around into the negative numbers, but remember that +48 is a iron number.