What does Jim Mc. mean about Iron rejection?

[Anonymous]

Could Jim or someone else explain what iron rejection is it ground balance, I am not sure what that really means as the MXT detects and displays iron and ground mineralisation. Does it mean manually
tuning out iron ie. the discrimination settings?
Sorry I am still trying to make sense of what may be simple terms to most experienced users.
Thanks

 

[Anonymous]

Flatliner,
Iron rejection is the detectors ability to discriminate out iron. There are many opinions on what makes for good iron rejection. Some machines reject iron at or below the discrimination setting cleany and quietly while other give audible clicks and pops on iron at or near the disc setting. On some machines at low (smal) iron rejection levels give you enough audio information to be able to tell the larger iron that is not disced out from the good non-ferrous targets.
Since iron varies so much in size and shape it is nearly impossible to reject all of it in the ground. The MXT like a lot of machines will read large heavy iron as a good target. I rate it about average or slightly above in rejecting the big stuff and slightly below average on "quietness" on rejected iron.
Turning down the sensitivity helps eliminate much of the noise when hunting in iron. However, the best route is to run the disc setting as low as possible and learn to tune out the more common iron sounds concentrating on the better signals that pop up on occasion. After a while those "better" signals stand out and are easily heard over the noise threshold.
Tom

 

[Anonymous]

Thanks for you reply. I noticed on my MXT sometimes
I get a faint high pitch target tone which sounds good not loud at least above threshold level but the Display shows no VDI or anything. I don't know what that is. It seems if I can hear something down there it should read out?? Help

 

[Anonymous]

Someone correct me if I'm wrong, but the faint signal is deeper that the 12" coin size reading, it will not give a VDI number. I would most definite dig it.
I have dug a lot of good targets which did not give a VDI number. Dig,dig,dig.