Calif Bill wrote:

To get very close, you would have to have two transducers. Actually one
transmitter and one receiver. The ringing in the transmitter is one of the
major timing restrictions. You have to wait until the electronic eddy
currents dampen out before you can look for a received signal. And the new
units have more power and higher frequencies so you get better definition,
but the ringing is worse, so you have the 2-3' of not readable water below
the transducer.


Thanks for this explanation. Looking at the price of simple depth-only
low-power transducers (what you would need for a listen-only xducer) I
am left wondering why there are no dual transducer solutions around.