PI discrimination is possible

[moodz]

Yes it does, but I'm not gonna tell you the "trick" (hint: it's not a trick, it's Physics).

I agree with Teleno .. there may also be other ways to do it however "funny" damping and frontend ccts are a winner ... alot harder ( but not impossible ) with standard damping / frontends.

[Teleno]

The "secret" to discriminating PI won't be in any funny damping circuit or such, since a single excitation pattern won't do it all just as a single frequency won't do it for CW

Yes it does, but I'm not gonna tell you the "trick" (hint: it's not a trick, it's Physics).

[ODM]

Seeing actual PI discrimination in varied ground conditions and targets would give more faith besides the usual hidden software tricks or frontend overload.

The issue with PI is general difficulty in processing multiple excitation responses that CW does more elegantly, in MF or sequential sweeping like GEM series does. A detector with a powerful find mode like minelab MPS together with an identify mode with multiple halfsine periods or pulse shapes would likely fare better than a constant excitation pattern with tweaky processing.

The "secret" to discriminating PI won't be in any funny damping circuit or such, since a single excitation pattern won't do it all just as a single frequency won't do it for CW, for analysis purposes. We have seen this in the curious frontends and software tricks so far that have amounted to nothing for target ID outside of known obvious targets in known conditions.

[Teleno]

and what? Mustafa does PI's with the disc like cooking hot dogs!

https://www.youtube.com/watch?v=uEXe5N0ZlZE

and all are without the arduino )

Actually, Mustafa's is a piece of **** and you know it.

[kt315]

and what? Mustafa does PI's with the disc like cooking hot dogs!

https://www.youtube.com/watch?v=uEXe5N0ZlZE

and all are without the arduino )

[Teleno]

Coil: Ferrite core 150uH, 01. Ohms,
Pulse duration: 60us
Compensation resistor: 560Ohm.
Vdd = 12V

Oscilloscope:
The pulse in yellow is the start signal of the Tx pulse.
The pulse in blue is the discrimination signal, it shifts right for Fe and left for non-Fe.

LCD screen:
Count is the number of clock pulses (16MHz Arduino) between the yellow and blue signals.