With P1 you change the frequency, the better is about 2.5 - 3Mhz (the max frequency for CD4046). With P2 you change the amplitude of the signal, the better is at point (X) (the TR4 collector) a 2 -4 Volt peak to peak, with the scope you must have a good sine curve, not distorted. If you touch the antenna the output signal must decrease. You must have a test field with buried metals (gold, silver or copper) for at least a few months.
Regards
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