CyberSage
10-14-2010, 02:07 PM
I recently hunted a parkway strip that was at the center of a busy intersection. It used to be the front approach of an old train station that no longer exist. From old pictures this centralized grassy area looked to be unchanged in it's appearance. I decided this would be a good location for a hunt. This was a triangle shaped area surrounded by busy streets. Stoplights, automatic doors, power lines and transformers were all in close proximity. I started with the D2 Coil using my usual Correlated program. The detector became stable at an RX of 6 and a DS of 89, pinpoint mode was very noisy. I adjusted frequency offset and settled at -1. I started swinging and finding clad dimes and pennies at variuos depths. I finally encountered a deeper hit at around 6.5 to 7 inches. It was a challenge to pinpoint, but finally got it marked off. I decided before digging to switch to the 6X10 coil and test it over this target. I walked across the intersection and swapped coils at my car. On returning back to the grass area I re-ground balanced and checked offset. I left it at the same -1 setting. I was able to adjust up the RX to 9 and the DS to 93. I swung a little away from my marked area and then approached and swung over the mark. There was no response. I watched my display to see if there was a wrap going on. It stayed clean, I could not see the coin with the 6X10 coil. Oddly enough I could pinpoint it a little easier. I left the target went through the whole balance procedure and tried again. Still no hit! Back to the car to swap coils again. Stabilized the V3 and ground balanced with the D2 again. I approached the target and it sounded immediately from to different angels. I dug and found a Memorial cent at 7 inches. It was a 1972. I was disappointed that it was not an older coin at that depth. Just thought I would share this comparison. It would appear that even with EMI and having to adjust down the V3 the D2 still is a better choice. I will report on more comparisons as I continue to hunt this area.
Jack
Edit: I have a 3 year old coin garden at my house which has EMI issues as well. Not near as bad as the grass area however. With the same above settings I can see a wheat at 7 inches with the 6X10 coil. It wraps on a Wheat at 8 inches, but I can see this on my display. I am not sure why I had trouble seeing the memorial at the grass area. It seems like at 7 inches it should have been in range. Is it possible that the higher EMI is effecting the 6X10 in it's overall depth, more so than that of the D2's? May be this is a coin garden verses actual dig type situation.
Jack
Edit: I have a 3 year old coin garden at my house which has EMI issues as well. Not near as bad as the grass area however. With the same above settings I can see a wheat at 7 inches with the 6X10 coil. It wraps on a Wheat at 8 inches, but I can see this on my display. I am not sure why I had trouble seeing the memorial at the grass area. It seems like at 7 inches it should have been in range. Is it possible that the higher EMI is effecting the 6X10 in it's overall depth, more so than that of the D2's? May be this is a coin garden verses actual dig type situation.