[Qiaozhi]

Originally Posted by Esteban

This is a serious question - Does this BFO have a transmit circuit, or is it just the local oscillator section?

BFO is transmitter-receiver, 2 in 1.

Also, why doesn't the detector detect objects behind you as well as in front?

Good question. First, because the person acts like a screen. You're connected at earth through your shoes. Second, in back part of coil is another circuit wich acts as screen. So, the BFO is adjusted with all the metal parts as electrolitic, screws, PCB, RF shielded transformers, etc.

Thanks Esteban.

Also, I note in your photo that you are not wearing headphones. Does this detector have a loudspeaker or perhaps a meter?