The only drawback I've found with the 18.75 kHz coil so far....

[rentasquid]

is that when Ground-Balancing my x-50, it drops the balance of the detector even closer to that "0" point. I had a playground that I hit this past weekend, and after gb'ing the detector, it was set at 1, which doesnt leave me with much play. Anyone else notice this with their detectors?

J.

 

[Dick from IA]

Over the weekend, with the X70, I switched from the 18.75 to stock coil and re-ground balanced. Was 23 with the 18.75 and then 24 with the stock coil.

What you're describing doesn't sound right, IMO

 

[BarnacleBill]

The particular coil should not make much difference. But as far as GB point, yes I see 1 & at times 0 on the X50. On the X70 with it's higher resolution these are numbers less than 10, which I see most of the time.

By comparison I have a CZ70 and it GB's right around 2 to 2.25, and you have about the thickness of a sheet of paper between too negative or too positive.

HH
BarnacleBill

 

[rentasquid]

I wouldnt think the coil would make a tremendous difference, but it does across the spectrum of readings. With the highest that I usually find, quarters, they drop from 42's to 39's. The same is reflected on down the scale until I got to nickels. They actually move up to 12's from 9's. This same playground usually balances out at a 2 to 3. With it down to 1, I dont have much control left until it becomes a preset detector!

Thanks for the input guys!

J.

 

[RonNH]

I'm a little confused about Ground Balance in general and I haven't even been out with my new 70 yet. As I read it, there are 3 different ways to balance. What is the best way to run this machine? Does it depend on the ground minerals? I would think that Auto Track would do a good job and then I read where people are looking for that perfect balance. I want to be concentrating on detecting and not having to worry if a few numbers change on the ground readings. I know cancelling out the ground is probably the most important thing the machine does, but is it all that important to split hairs with this setting? Ron

 

[BarnacleBill]

With Monte's table here: http://www.findmall.com/read.php?55,356446,357270#msg-357270

It may shift some from coil to coil, but not enough on the X50 to move across the number segment. And if it does then how far into the segment can be hard to tell. As opposed to the X70 where it is easy to see it move. One thing I do from time to time with the X70 is go into the GB screen with Tracking on and monitor the ground as I move along.

My ground constantly varies 2-3 numbers in the more homogeneous areas like a sandy beach, to the cobble fields where it will move 10-15 rapid fire.On the X50 over the same soil, the GB point is still moving and if you could monitor it, may or may not move between segments, say between 2-3, or the movement may stay within the 2 segment on the X50. One thing I have noticed is very cold temps ~15F will cause a downward GB shift by one number on the X50. But that may vary from coil to coil from manufacturing tolerances. Even at the coldest temps with X50 at GB 0 I have not needed a -1 GB if it were available.

If you are at 0 on the X50 and need more lower GB shift I would try to change the Noise Cancel, and see if that shifts the frequency enough to change the coil tuning point. May or may not work, if not I would send the coil back to see if it's tuning is off.

HH
BarnacleBill

 

[BarnacleBill]

It's as simple as this. In the old general stores they used a "balance beam" scale, where you would have to zero the scale with a little calibration weight. Without zero-ing the scale you could not get an accurate weight on items you weighed.

The X70 like most common VLF's in use today is an "induction balance" detector. It is the electrical equivalent of that mechanical "balance beam" scale. To accurately measure what the detector sees in the ground, you need calibrate/zero-out the ground before starting your measurement. That is all you are doing, zeroing out the ground.

Starting out I would use Tracking on the X70. Locate a 3ftx3ft clear area, make sure Tracking is Off. Lower coil and swing in this clear area and turn Tracking on while doing so. The first 5 seconds or so of Tracking is a fast mode where it will rapidly adjust to the ground and then switch itself to a slower update for fine tuning, and so it does not Track targets out. At that point just start hunting and don't worry about it.

HH
BarnacleBill

 

[RonNH]

n/t

 

[Monte]

took to the X-Terra 70 very quickly. The GB adjustment range is far superior.

You can go just 1 or 2 numbers either way with the X-T 50 and really hear a pronounced audio difference if you're in moderate to highly mineralized ground. But the X-T 70 allows for more adjustment range, and more "fine tuning" and doesn't display that radical audio change if you're

 

[rentasquid]

It was a school playground up the McKenzie river. No Pea gravel...just dirt. I have always had to adjust specially for this school, but it seems to typical of the non-loam areas where I hunt.

Thanks

J.