I have a customer with a DSM 300 (v4.20) driving a new B117 transducer which is mounted in a pocket on a Regulator 26FS. Following installation of the new transducer, the DSM 300 worked fine for several hours then lost bottom while showing a snowy screen on the C140W (v1.12) This same sounder works fine with a P79 transducer. I have tried two other DSM 300's with the same result. Is there any sort of issue with a DSM 300 when it is paired with a B117 transducer?
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