Two settings, endless confusion. Here's what they do, how they fight each other, and how to set them per hunting site.
Two settings, endless confusion. Here's what they do, how they fight each other, and how to set them per hunting site.
How strongly the machine listens. Higher = deeper and hotter on small targets, but also more chatter from ground minerals and EMI. Rule: run as high as the ground allows stably. If it's falsing, back it off — a stable machine finds more than a screaming one.
What the machine ignores. Iron discrimination silences nails and ferrous trash; notch lets you surgically remove pull-tabs while keeping nickels. Cost: heavy discrimination can mask good targets next to trash (masking), and deep targets often read as iron.
High sensitivity + low discrimination = maximum finds and maximum trash. Low sensitivity + high discrimination = quiet and pleasant, but you'll walk over deep keepers. Match to the site:
Here's the physics that limits every detector. Each metal responds to the coil's alternating field with its own phase response: low frequencies penetrate deeper and favor high-conductivity targets (silver, copper), while high frequencies favor low-conductivity ones (small gold, iron). Discrimination works by reading that phase — but some trash and treasure share nearly identical responses. The classic example: tinfoil and small gold look alike to the machine, especially as alloys. Crank discrimination high enough to silence foil and you'll silence thin gold chains too. That's why experienced hunters dig "iffy" mid-tones at the beach: the machine literally cannot tell them apart, so the human decides.
Yes — moderate discrimination keeps early hunts fun instead of a bottle-cap excavation. Learn iron audio first; graduate to lower discrimination as your ear improves.
Iron bias (e.g., adjustable on the Vanquish 540 and X-Terra Elite) controls how aggressively the machine calls ambiguous targets iron. Higher = fewer false non-ferrous signals, but more masked good targets in iron.
You're hearing ground minerals or EMI (power lines, other detectors). Lower sensitivity until stable, move away from interference, or re-ground-balance. Stability beats raw power.
Phase response: pull-tabs and gold rings are both mid-conductivity targets, so they produce nearly identical signals. No discrimination circuit can separate what physics makes identical — this is why beach hunters dig every solid mid-tone.
Effectively, yes. Heavy discrimination costs sensitivity on deep and edge-case targets, which start reading as iron. That's the core trade: quiet hunts vs maximum finds.
Settings are site-specific, not universal. Anyone selling 'perfect settings' is selling something. Learn what each control does on your ground, and you'll out-hunt the settings copiers.