Question about Humminbird Smartcast RF15 Fishfinder
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Posted on Jan 02, 2017
The Smartcast system uses the wireless version of a simple transducer and thermometer to locate fish, show structure and water temperature. From your description, it sounds like the transducer portion of the Smartcast device has stopped working.
Transducers are both simple and complex, sturdy and delicate. Here is a Science Minute: A fish finder electrical signal is sent to the transducer. The electrical signal to energize the transducer crystal is generated by an amplifier. The energized crystal reverberates at a particular frequency, to convert the electrical signal into mechanical acoustic or sound energy. The acoustic energy or sound waves causes oscillation of the water molecules through which the sound travels. The sound is pulsed out in a defined beam. These do not travel out in a straight line but in a wave pattern. The acoustic pulse travels through the water at a rate of approximately 4800 ft (1500m) per second in saltwater and 4920 ft/sec in fresh water.
The problem is that the crystal in all transducers (permanent mount, thru-hull mount and castable) is delicate. It is a crystal. Unfortunately the warranty on most of these is six months, and unless yours is newer than that, you may need to buy a replacement castable. The handheld unit should still work. While I think the idea of knowing what is "over there" is a good one for shore fishing, I haven't bought these systems because I could never get over the idea that repetitive casting of a crystal, no matter how well-housed, was a good idea. Good luck.
Posted on Sep 27, 2011
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