One of my biggest questions about the F-75 is in regard to the number system/expanded segments...

[christopher-ohio]

Somewhat of a corollary would be the XTerras-each model expanded the segments-I found the 50 to nicely lock on good targets and bounce on trash; the 70 would bounce quite a bit and not "lock on" good targets like the 50. Now with the T2 and the F75, I find this to be of significant interest to me on deciding which machine would be more to my liking in this regard after using CZ's especially the CZ-70 and 3D...JMHO...HH

 

[Jackpine Savage]

Good question Christopher. I would like some info on that as well. Higher frequency detectors are known for not having good TID seperation on US copper/silver coins of differnet sizes. Perhaps Dave J or Tom D will give us some hints on how it was done.

Tom

 

[BarnacleBill]

as you can assign the target response to any type of display mapping you like. I hate to say it, but coming from something like a CZ70 you are not really seeing what is going on behind the faceplate. As an example take the CZ70 "$" icon on the far right, electronically the target could be varying all over the place within that icon display space, but to you it looks rock solid. So your immediate response can incorrectly be, "gee what a rock solid display". Looking at the drawing below you can see all the coins hidden within that icon space. So the greater the resolution the less stable the machine is going to appear, when in reality you're just seeing more of what's going on below the coil. But there is also the danger of having so much resolution that the digital display starts to look like a slot machine.

[attachment 49422 DiscriminationChart.jpg]

Let's say on the Fisher Excel and Edge you have your (-)36 to (+)36 range, with the 0(zero) to (+)36 being of most interest, it is pretty linearly mapped to the phase on the diagram above at about a 3-4 degrees per display number starting at 70 degrees and rising. Between Nickel & Tab on the Excel & Edge is only a couple numbers usually, which by contrast on the X-terra X70 is about 6. The X70 has greater resolution numerically, but it is also mapped differently than the Fishers or the X50. It appears that the F75 will now numerically be more closely mapped to the X-terras with fewer numbers in the iron range.

Now comes the really interesting part. The X-terra X70 has a mapping that is conducive to jewelry and relic hunting because of the expanded mapping from foil up through square tab. How they choose to map the F75 will give a clue as to the intended market. If it has an expanded upper range to help those that try to distinguish between clad and silver coins will suggest more of a coin hunter, expanded lower range a relic hunter.


HH
BarnacleBill