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Old 10-22-2019, 06:40 PM
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ewizard ewizard is offline
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Join Date: Jan 2010
Location: Outside the Matrix
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I built an ultrasonic transmitter about 50 years ago. I believe you can get ultrasonic transducers from places like mouser.com and others sources like that. I downloaded data sheets on several there and while they state the center frequency is 40 KHz plus or minus 1 KHz I would think they could still operate at 42.8 KHz by just plugging them onto a frequency generator. They would not be as efficient but I'm fairly certain they would generate the 42.8 KHz. I might be wrong on that but if so it would seem you could contact the manufacturer of these transducers to see if they can produce them in the range or if they have some ideas on how it may work with the existing 40 KHz units.
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