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Simrad BSM-2 Settings

Old 07-28-2013, 02:38 AM
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Default Simrad BSM-2 Settings

I have been following with interest the various threads on the performance of the BSM-2. A general observation seems to be that performance is much improved in CHIRP mode with higher gain settings. I had been going with "Auto." Using the traditional approach of setting gain by looking for the level at which a weak second echo becomes visible, the auto "zero" level seemed about right.

Yesterday, I experimented using higher settings and ended up with "auto +6" in about 30-40 feet using the high CHIRP range with color around 32. I have ping set to Max and TVG at 2 and scroll speed at 2X trolling around 3-4kts for striped bass. I was definitely marking a lot more fish and bait with these settings that I had been seeing with gain set to "auto".

The question I have is that it is somewhat counterintuitive that Simrad would design the software such that "auto" does not produce reasonably good performance. Certainly on all the Furuno conventional units I had previously such as a NavNet DFF1 that I had until this year, the "auto" setting was quite good and close to where I would have set the unit with manual gain adjustments.

So what is the right approach to setting gain on the BSM-2 if the old standby of looking for the second echo line produces inadequate results?

I have a PM265LH transducer.

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