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The transistor Q16 is controlled from ALL channel. When some target is detected, this transistor enables the work of the final stage of the DISCRIMINATION channel to show the type of the target - Fe/non-Fe. For Fe target, The "Fe" LED lights up first and after that "non-Fe" LED lights. For non-Fe target this order is reverse.
Why does discrimination use a later signal? Is the discrimination block swapped with the right channel?
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