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Old 10-22-2019, 06:48 PM
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ewizard ewizard is offline
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Join Date: Jan 2010
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This unit would probably do the trick:
https://www.ebay.com/itm/High-qualit...wAAOSwft9csEw9

20 to 40 KHz and 40 to 120 KHz frequency ranges and 1500 watt output ! Unfortunately not cheap - about $1100 with shipping. Maybe they have a lower output unit that can do the job for less.

Also look at this eBay item number:323709703394 as the seller has a lot of different transducers and your choice of many different frequencies. Write them a request and maybe they can do one specific to 42.8 KHz. If they think there is a market for it I'll bet they would produce them. Same seller as the on for the unit above.
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Last edited by ewizard; 10-22-2019 at 06:53 PM.
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