Opinions when signal nulls out at 90 degrees

[4thDoctorWhoFan]

I would appreciate some opinions on if you dig when you have a decent dime or penny signal both swings one way then when you swing at 90 degrees you get a null both swings.
Let's say the depth is between 4 to 6 inches and the signal initially varies between Fe-11 to 13 and Co-40 to 44.

Is the initial decent signal the iron falsing problem I keep reading about?

Thanks!

 

[rbholt80]

i dig.
iv had good one way hits that wouldnt hit on the return swing and still found a coin down there mixed with irion.
so a two way hit that wont hit when you turn 90

 

[CONDUCTOR7E]

Depending on the strength of the tone,is it solid or choppy?The way the Threshold nulls out also gives me a dig or no-dig decision.How does it pinpoint?If during a pinpoint check as you slowly sweep,does it suddenly rise up and then abruptly stop?Thats a sure sign of a coin or something similar to me.If it pinpoints over a much wider area than a coin would then there is a very good possibility that it is just trash.What do the numbers read?It may be a coin on edge,be in the presence of ferrous iron or other trash.There is no definate answer to this as each situation is different and must be approached accordingly.