All metal sens

[golfnut]

I have an IDX and its ok,


Question 1
With all machines of this style, If you tune the disc into all metal - It gets Iron, and it gets non Fe targets better.



In this state, the synch det is sampling earlier in time/phase - So it gets more response from Iron - as co located with iron target phase - I'm ok here.

BUT

The depth to non Fe increases in this condition also??? We have moved the gating earlier, so the non Fe sens should reduce, not increase ? ?
What am I missing with this.



Question 2
When I Disc iron out, I get 5" to non Fe targets in my test bed.
With disc on all metal, I get 9" to non Fe test bed targets. - Nice to have, but 99% would be iron in the field.

Is there enough phase delta between the geb Ch and the 'All metal' CH to resolve where target phase lives - Just Iron or not Iron??


S

[Jerry]

Hi Steve,

It is not only detectors like the IDX and TGSL. I have seen the same thing with my At Pro, with is a digital machine. the AT does not have an all metal mode as such but will let you listen to tones over the entire VDI scale so it amounts to the same thing.

What I have noticed on the deeper targets, it will first loose it's digital ID but retain the tone. On even deeper targets, it will also loose the tone ID but still give a lower tone indicating the presence of something but not for sure what.

I have some ideas on why that happens but I will leave it to the people that actually know to explain it if they will.

Jerry

[golfnut]

Hi Steve,

It is not only detectors like the IDX and TGSL. I have seen the same thing with my At Pro, with is a digital machine. the AT does not have an all metal mode as such but will let you listen to tones over the entire VDI scale so it amounts to the same thing.

What I have noticed on the deeper targets, it will first loose it's digital ID but retain the tone. On even deeper targets, it will also loose the tone ID but still give a lower tone indicating the presence of something but not for sure what.

I have some ideas on why that happens but I will leave it to the people that actually know to explain it if they will.

Jerry

Nice machine, a bit heavy for me, good shape and size coil on this one - priced fairly, does well in european soils ~ 16kHz
S