Target Readout

[CampCache]

Yesterday I decided to use the LF on the X-70 and hit a church yard that we have hit pretty hard. This was the first real time I have used the LF coil. The yard is very trashy but has more iron trash than modern trash. I NCed and GBed the machine and went to work. I found several coins ranging from pennies, dimes and quarters. All of these targets would bounce from 38 to 46 and not lock on solid..... kind of like the iffy targets that I hardly ever dig. Most targets that I have dug in the yard before have rang up solid. Most of these targets were fairly deep ranging from 4 to 8 inches. On this trip I didn't hit anything that rang up real solid. On one hand I think that the coil is acting crazy but on the other hand I think that the coil is acting this way because of the targets in relation with the trash.
Seems like I read something about this but can't find it.
What could it be?

 

[Digger]

Targets laying flat at depths of 4 inches or less, with minimal soil mineralization, no adjacent targets and no electrical interference will read pretty much as the TID chart indicates. However, there are usually one or more of these "culprits" in the places we detect. Although TID is usually only good for the first 4 or 5 inches, audio tone is more consistent at greater depths. Targets buried at an angle can cause TID distortion. Mineralization levels will alter TID. Any target adjacent to the "main target" will skew the TID results. And any RFI / EMF can alter the TID readings as well.

If I were to offer one suggestion, it would be to lower the sensitivity. Running too high of sensitivity can cause the transmit signal to "bounce back" at the coil (due to ground conditions and rejected targets). If you've followed this forum, you'll find several posts where I compared running too high of sensitivity to driving with your high beams on, in the fog. The "bounce back effect" from the high beams is similar to the bounce back effect of running too much sensitivity.

For whatever reason, I've also noticed that the "typical" TID's that I get from common coins has been irregular this summer. I don't know if it is the dry soil conditions or if there is something else going on. But, regardless which detector I've used, I've noticed that the TID is a number or two higher, and is somewhat instable. Can't tell you why your's acted the way it did. But nice to see you followed up on the audio and dug some coins.

JMHO HH Randy

 

[CampCache]

Thank you for the reply. I will try lowering the sensitivity and trying the yard again tommorrow.

 

[Goes4ever]

rarely do I get "solid" signals at the old farm houses I hunt, this summer is unbearably dry and I know that does not help one bit, plus most are loaded with iron. The more you use your machine the more you will learn, I totally ignore numbers anymore, I look at them a lot of times merely to guess what i will be digging, but I rely on sound to decide whether or not to dig. I have indians that ring as silver dimes, and other days they bounce from single digit numbers to as high as #46......it all depends on depth, adjacent targets, angle of coin etc......if time allows I dig all signals above iron, but I still am right about 8 out of 10 times when I say this is gonna be a coin, no matter what the numbers say.