Keenfisho,
Over the last 4-6 weeks we have received calls from end users on this exact situation. Again the 585/587 was designed to use a diplexed transducer that has both frequencies in the same housing. That being said, would a 585/587 work as a high frequency sounder only without the AF and BD modes if a B-175LW was connected, probably but how well is the bigger question.
Snips