Question for Impact users . . . iron falsing

[Tony N (Michigan)]

I've been hearing a lot of very good reports concerning the Impact.

I have quite a lot of detectors and the one issue I have found to be the case with them is iron falsing which mimics a deep coin.
Does the Impact also false on iron nails that are deep?

Here is my issue with my detectors: If I place a silver dime next to an square cut iron nail, I can easily hit the coin going against the length of the nail. I can also hit the coin up to about 45 degrees against the length
of the nail. However, swinging the coil along the length of the nail, I cannot get a hit on the coin.

In the field, this scenario is mimicked when the detector falses off the iron nail. In other words, it sounds like a coin next to an iron nail but when swinging 90 degrees to the original good sound, the falsing stops, thus making me wonder
if it is a coin next to the nail. So I dig and there is nothing but the iron nail.

So, to sum up: Has the Impact the ability to deal with this problem?

Thanks for your imput!

 

[Sven]

When I hunt I Di3 mode and I get a iron tone and a quick high tone chirp, I will rotate the DD coil to see if I can get a more positive high tone chirp. If I can, it is usually a coin (Canadian coin). If I can't its probably iron of some sort.
Not sure what your asking about is just iron masking? A good detector is trying to separate the two targets.

 

[Mudwhale]

Tony
The Impact when it gets to what you describe as a good conductor on Deus or other units you own, but, is in fact what is in reality "High Iron", that gives a great signal, I,E, "good target", Deus puts it within 1 digit on their ID scale to a really good target. Impact puts these targets at the "OUT OF THE PARK' tones and TID's. On Deus I got a solid hit which said "DIG ME", only on multiple occasions to be a big piece or rusted iron. Impact screams at you with this as to avoid, tonally and TID wise. Anything above 94 on Impact is this junk you are talking about.

 

[Mudwhale]

Tony
To answer you original question correctly, here it is. As an engineer, what you describe with the nail horizontal is the bane of all detectorists. The field generated in any double D type coil is highly polarized. In other words, magnetic fields are either North-South, or South_North. Ignoring "Mother Natures" view of true North - South. The design of the coil determines the N-S orientation unto itself. IT defines it's own orientation. The coil does not care where true north is but generates it because of the way it's made. North-South is typically you looking at your coil from the vertical line. East-West would be horizontal. The way any double D type coil is designed is the same. In a nutshell, any iron horizontal to any coil will block any other signals. If you rotate around the target to 90 degrees, you will get 2 targets with the masked separate from the "Unmasked". Part of this phenomena is OHM's Law and some fro NIcola Tesla's study on Magnetism. This is where physics gets intertwined with electronics....