Quote:
Originally Posted by Dubulumach
Thank you FrancoItaly
You thought adding the TR5 stage as emitter-follower to hef4046 version and take signal without rectification to input of phase comparator or something else like more amplification stage with grounded emitter bc183c ?
I have tested the Quartz version at my test polygon with seveal silver coins and small gold necklace 30 cm in deep, clean soil. I have got strong signal after tuning input coil inductance, about 2,5m - 3m from the targets. Both targets are at distance more than 1 m from each other.
Multiple antennas connected together electrically each other or via small variable capacitors ?
About observation of waveforms at point X., no need for direct contact with point X, just put the sensitive high impenadance oscilloscope probe couple of milimeters near collector and waveform is at the screen withouth affecting amplitude of the signal.
Best regards 
dubulumach |
Good idea for scope measure. Multiple antennas are connected together electrically each other. It's only necessary to add the tr5 stage, no other changes for 4046 stage.