question about deep signals

[BarnacleBill]

When targets are deep, other factors affecting ID can be:

1. The type of coil being used.
2. Soil type with ground noise & attenuation factors.
3. Ground balance.
4. Sensitivity.
5. EMI, even if you don't hear it, it doesn't mean on weaker signals that it isn't having an effect.
6. Target at an angle.
7. Co-located targets, rust spots etc.
8. Sweep speed of the coil.
9. Poor coil technique, pendulum swing, non-parallel etc.
10. Improperly secured/dressed coil cable.

When targets are at the limit of detection to obtain a valid ID you have to have your settings optimized and your coil technique also. Increasing/decreasing sweep speed, coil height, angle of attack, one way & two way approach, approaching from adjacent ground that is target free, ending swing before any edge effect from co-located targets etc etc.

HH
BarnacleBill

 

[Goes4ever]

thanks for all the replies, you guys sure help me a lot!

 

[dlively]

Goes4ever, I have been hunting the parking area of a group of little league fields. I have had several clad penny's indicate 44 and a couple at 36-38 and these were very shallow at less than 2". I am using the 6" 18.75 coil since the area is very trashy ie 10-15 signals per sweep. I think its a combination of the trash near by and the soil is very compacted due to vehicles driving over it almost nightly. The signals are good solid signals so I dig them but have been disappointed they weren't dimes or quarters. I find so many penny's here that I sometimes think the kids just throw them away or something. In a typical hour I will dig 20-25 penny's maybe 2-3 quarters 1-2 dimes and 0-1 nickle. I have never used STABILITY mode. I normally use all metal unless the constant noise from trash gets to me.

 

[mikezap]

I experience the same thing with the teknetics t2 on deep and sometimes not so deep pennies. I just tell myself it's from the copper giving off a big halo then I pocket the coin and move on. I really don't think it's worth dwelling on b/c there is no such thing as 100% accuracy with metal detectors...2 many variables. My 2cents.

 

[Jackpine Savage]

could be a number of things. To be on the safe side and if you are not using a pinpointer, always check the dirt pile from different angles while in all metal using a very slow sweep. That way you will never miss a good target masked by a piece of iron that also happens to turn up in the pile.

HH Tom

 

[BarnacleBill]

n/t