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Wide Beam Transducers

Old 10-07-2008, 06:48 AM
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Default Wide Beam Transducers

Hello everyone, I am new to this forum and outfitting an new boat. I was wondering if anyone here has had any experience with with wide beam transducers. Specifically the airmar ss270w which sends beams out at 25 degrees. This would seam to be ideal for locating surface tuna and or shark???
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Old 10-08-2008, 07:24 AM
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Default Re: Wide Beam Transducers

A lot of this has to do with the depth you plan to be fishing in. Shallow water sounders are normally pretty wide. Fishermen will use narrower transducers in the cold, deep waters of the Pacific.

The most popular sounders usually have the 50 htz transducer set for wide and the 200 htz set for narrow. In this case, you'll see a pod of bait on the 50 side, but not the 200. You circle carefully until you pick up the bait with the 200 beam.

This gives you the best of both worlds, a wide searching beam and a narrow "get on top of it beam". In my experience, I could see a small group of rock fish on my 50 htz screen. I couldn't catch them because I wasn't actually over the fish. I should have switched over to my 200 htz screen and circled.

I've spent quite a bit on interphase scanning sonars over the years. In most cases, I didn't have very good luck with them. The commercial fishermen are having good luck with the commercial scanning sonars. Hummingbird has a new scanning sonar out. Hummingbird has a very active users group on Yahoo that you can study. Some of the pictures they are getting are pretty amazing. Have a look at:http://www.fishsniffer.com/cgi-bin/f...num=1170825408
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Old 10-08-2008, 08:43 AM
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Default Re: Wide Beam Transducers

Well Ive decided to try one, and here is my reasoning. I know i will not get the bottom read out of a standard transducer, but @ 100 ft. i will see a 45 ft. spread, meaning that on a 12 ft. beam boat my line would only have to drift about 17 ft. to go outside of the window. On www.airmar.com they claim excelent readouts with a min. of 1350 ft. @ 50khz and 330ft. min. @ 200khz. This ducer would seem to have an atvantage at finding bait schools and tuna or shark lurking @ 80 to 120 ft. The boat will leave for Mexico at the end of November and I'll post my results.
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Old 10-08-2008, 07:25 PM
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Default Re: Wide Beam Transducers

Just to add a little to what monterey10 explained.......
One important thing to remember is the mark of a fish on A display is shown as the distance it is from the transducer and not the actual depth of the fish. UNLESS the mark is directly underneath the boat. In other words a very wide beam can be quite misleading as to the actual depth the fish are you are marking..........Did that make any sense
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Old 10-08-2008, 07:34 PM
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Default Re: Wide Beam Transducers

This is some great info here!! I learned something new that I have been wondering for a while with regards to 50/200Htz! I'm gettin edgemacated!!! Thanks for the informative info Monterey and Surf!
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Old 10-29-2008, 09:44 AM
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Default Re: Wide Beam Transducers

Has anyone actually installed and used the new Airmar SS270W wide-beam transducer? Just wondering how well it works.

Anyone know when Airmar will be making a version to interface with the Lowrance LCX series of sonar/fishfinders? I'm contemplating replacing my B744V with the SS270W for better marking of suspended fish in the upper 150' of Lake Ontario.

Any thought or opinions would be welcome. Regards...

-Steve D
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Old 10-31-2008, 09:00 AM
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Default Re: Wide Beam Transducers

hallabars - 10/8/2008 7:43 AM

Well Ive decided to try one, and here is my reasoning. I know i will not get the bottom read out of a standard transducer, but @ 100 ft. i will see a 45 ft. spread, meaning that on a 12 ft. beam boat my line would only have to drift about 17 ft. to go outside of the window. On www.airmar.com they claim excelent readouts with a min. of 1350 ft. @ 50khz and 330ft. min. @ 200khz. This ducer would seem to have an atvantage at finding bait schools and tuna or shark lurking @ 80 to 120 ft. The boat will leave for Mexico at the end of November and I'll post my results.
Your reasoning is very good. If I were to change my B-260 today, it would be with a SSB270 for the wider beam as I too don't fish much over 300ft and usually in 100ft.

I have this hooked to a Furuno 582 and I run it in manual mode on 50Hz all the time to get the wider beam width.


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Old 10-31-2008, 03:16 PM
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Default Re: Wide Beam Transducers

Yes, especially this last season at Ontario, the fish were really dispersed; so we spent a lot of time "searching". To do that I use 50KHz exclusively to cover as much water as possible. But as you know, 50 is a little noisy and low on resolution. Sure would we nice to cut a 25 degree swath though the water at 200KHz! But I would like to get an opinion from someone using it before I open my wallet...8-]

-Steve D
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Old 11-01-2008, 06:55 AM
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Default Re: Wide Beam Transducers

I've used one all year in front of a C120. Lots better than the 744? I had on a previous boat. Basically I leave it on 200khz all the time, as it has no problem reading to at least 350', which is the deepest I've been. On A-scope mode, the Raymarine doesn't recognize the 270, as the the bottom width numbers don't make sense.

Does the wide beam make a difference: I don't know. For me, the biggest difference has been the 1000 watt power versus 200 watts. The width must make a difference, but determining exactly how much is the issue.

I'd buy the exact same setup again if given the chance.
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