Goldpick
Chris Johnson
That's ok Havingago, just Minelab tech speak. 
Opening up the screen essentially means using less discrimination, and it relates specifically to the Smartfind screen on the Etrac/Explorer/CTX that shows your current discrimination pattern. The more areas blotted out in black, the more discrimination is in effect, a completely white screen is essentially all-metal.
discrimination pattern
not quite an open screen, minimal discrimination
The more discrimination you use on these multi frequency detectors, the more " nulls" or periods of silence as the background threshold disappears momentarily as the coil passes over discriminated targets. When you get areas of very dense junk, quite long periods of silence can be heard as a result, and this can potentially mask good deeper targets that sit in close proximity to the discriminated target. This is exacerbated by the slower recovery speed experienced on these detectors compared to a single frequency VLF, necessitating in a relatively slow swing speed to allow the processor to play catch up.
So just a matter of picking the right detector for the location and conditions, unfortunately in my case I didn't have the correct tool for the job on the night.
Opening up the screen essentially means using less discrimination, and it relates specifically to the Smartfind screen on the Etrac/Explorer/CTX that shows your current discrimination pattern. The more areas blotted out in black, the more discrimination is in effect, a completely white screen is essentially all-metal.
discrimination pattern
not quite an open screen, minimal discrimination
The more discrimination you use on these multi frequency detectors, the more " nulls" or periods of silence as the background threshold disappears momentarily as the coil passes over discriminated targets. When you get areas of very dense junk, quite long periods of silence can be heard as a result, and this can potentially mask good deeper targets that sit in close proximity to the discriminated target. This is exacerbated by the slower recovery speed experienced on these detectors compared to a single frequency VLF, necessitating in a relatively slow swing speed to allow the processor to play catch up.
So just a matter of picking the right detector for the location and conditions, unfortunately in my case I didn't have the correct tool for the job on the night.
