i went out onto the beach several days ago and was very frustrated by the amount of signals i got mainly from trash items using my home made pulse machine,i feel now maybe pulse machines are better for fairly clean beaches for special applications...surely there must be some way of rejecting large junk items and some iron, i have an electronic engineering background and the only way i can see any trash rejection is maybe sampling on the tx pulse or multi samples in different positions on the back emf waveform...can any one please share their thoughts on this.