Help with wildly inconsistent VDI/TID (7 replies)

Hello,

I'll air test a penny and the VDI will be fairly consistent.

Then I'll scan a patch of ground with 0 descrim to make sure it is free from nails or any other targets. I'll place penny 2-3 inches down and I will receive numbers swinging from 20-97......

I've GB first (GB of 74-76), ran in 3 or 4 tones, and tried different levels of descrim to help tighten the numbers up.

Any ideas on what is going on?

I'm coming from a Deus, so I am accustomed to variance on VDI numbers, but this is incomprehensible.

I'm stumped......

Jeff