I recently purchased a CS4PI which is the latest model that has an elliptical 8" x 11" coil instead of the concentric coil. First time out I was very impressed. Dug up two .925 rings sitting in wet sand at the low tide line as well as alot of coins and junk (tent pegs, hair clips, lead sinkers, etc...as you'd expect to find at the beach using a PI machine). It seemed to be stable but I had to back off on the sensitivity a bit to make it stable at the highest frequency.
My questions are three fold...
1) Has anyone done a side by side comparison of the two coils? It'd be interesting to see if the new elliptical coil makes a difference in any way.
2) What is better? Lower the frequency to obtain higher sensitivity or lower the sensitivity to obtain a higher frequency? I figure the lower sensitivity/higher frequency will make the machine more hot for the small stuff but you may sacrifice depth in doing so. Is this a correct assumption? Is it best that you always sit in the green areas on both dials?
3) What is the best way to better waterproof the machine? The hard wired coil makes it a bit difficult to create a waterproof casing or bagging unless you can unscrew the coil from the case and feed it into something like a pelican case or waterproof bag. I haven't dared yet to look into doing this to a new machine but would be curious since I like to stay close to the water but not necessarily in the water.
I definitely am looking forward to learning more about this machine.
When we changed the shape of the coil we made sure the CS4PI worked as well as the old concentric shaped coil. The new ellipital shaped coil is heavier than the old one so it doesnt have a tendenacy to skim over the top of any standing water so you are always as close to the sand as possible.
When it comes to the frequency and sensitivity settings it is always best to have the frequency set as high as possible and back it off very slightly until the detector is stable.
Hope this helps.
Thanks for the quick reply. I personally like elliptical over polo/concentric coils and I was glad that the change was made.
Having used a Headhunter Pulse for years, I was happy to see that the CS4PI had the optimal dial settings denoted on the control box. It is making learning the machine so much easier and quicker and the fact that I can check the settings at a glance helps too.
btw can I make a suggestion about the belt attachment. the unit comes loose too easily from the unit if you bend down to recover targets. I usually use a short handle scoop though it probably wouldn't hurt to revert to a longer one to avoid this happening. I do have a control cover coming from the UK so that should help with the water resistance.