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B175 hw on west coast just doesn't work at speed.

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B175 hw on west coast just doesn't work at speed.

Old 05-30-2016, 07:58 AM
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Default B175 hw on west coast just doesn't work at speed.

I had the B175 hw installed a year ago. It is just too hard to fine tune to get bait detected when going 30 mph. Picks up so much clutter you have to tune it down. Could it be due to the big hull of a 34 ft pursuit? Factory is installing a b260 on the new 38 coming in. Should I try the 275 lhw or stick with the b260?
Old 05-30-2016, 08:05 AM
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At 30 mph try a fixed frequency instead of High CHIRP. 200kHz typically does a good job.

B275LH-W is the best transducer choice for your type of boat.
Old 05-30-2016, 09:39 AM
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The very best transducer, imho, for finding bait underway, is the SS164 (in an aluminum hull). Its a super tight 6 degree cone in 200Khz. It is 100% opposite to the newer way of thinking with the newer systems being a 25 degree cone, regardless of the frequency. ANYTHING ELSE, will be a step down.

Pick your poison.

Again, in my opinion, a dual element design, single freq transducer is where we should go next....one tight, one wide.

Pic below is a B164 in a fiberglass boat I had...notice the speed.
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Old 05-30-2016, 10:06 AM
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B175H-W operated at 170kHz fixed frequency. Speed 21.5 knots.

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Old 05-30-2016, 10:13 AM
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That pic shows ZERO fish finding at speed though...Finding bottom vs finding bait would be a different animal.
Old 05-30-2016, 10:20 AM
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Clean your glasses and look once more at 20-25m, there were no fish at the bottom. I was trolling fishing and was looking for bait between the surface and 30m.

If B164 at 200kHz had been used nothing would have been shown due to 6x narrower signal cone.
Old 05-30-2016, 10:40 AM
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Ocean floor is not a pic of bait-balls underway. That's all I was trying to illustrate with my pic.

Do you have any pics with bait or fish?
Old 05-30-2016, 10:46 AM
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What you see between 20 and 30m are small bait shoals. I very seldom I document the sounder screen in planing speeds so this is one of the the few I have. B175H-W does a good job at fixed frequencies at speed, but B75H is better for this, especially in CHIRP mode.
Old 05-30-2016, 01:07 PM
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That's what I am getting at. While scanning for kelp patties here in California or weed lines as the east coasters have, your eyes will catch a big blob of bait on a traditional sonar easier. I agree the chirp makes pretty pictures of fish but tired eyes from the sun need a big target to catch your attention while scouting for patties or trolling for tuna. Good discussion and enjoy learning from others with experience.

Maybe good combo would be keeping the b260 but add a 175hw for slower speeds like trolling. Or any other wide chirp units. Can the 275c-lhw work in Traditional too?? And as well as the work horse b260?

Last edited by Albi hunter; 05-30-2016 at 01:21 PM.
Old 05-30-2016, 03:38 PM
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Originally Posted by abbor View Post
What you see between 20 and 30m are small bait shoals. I very seldom I document the sounder screen in planing speeds so this is one of the the few I have. B175H-W does a good job at fixed frequencies at speed, but B75H is better for this, especially in CHIRP mode.
At this speed can be a termocline between 20-30m It is not necessarily bait.
shoals appear more vertically at this speed

this image is clear the thermocline and bait @5.5knots imagine how it would be the image passing 4x faster
(B175L)

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cheers
Old 05-30-2016, 04:03 PM
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I'm perfectly capable of reading my sonar screen, even at speed This is for sure small shoals of bait fish and a few larger fish. I've been fishing in this area for more than 20 years.

Thermoclines look very different from this location and time of year.

Simrad used one of my screen shots from the same location (and time) in the slide show for BSM-3 software v3.8. They also interpret these targets as bait. The screen shot used by Simrad is in CHIRP mode which is a bit noisier than fixed frequencies, the gain is also set a bit higher for this screen shot.

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Old 05-30-2016, 04:25 PM
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In this screen shot at trolling speed similar small bait shoals are shown closer to the surface.

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Here is how a thermocline often looks like.

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Last edited by abbor; 05-30-2016 at 04:38 PM.
Old 05-30-2016, 09:07 PM
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Maybe keep the b260 and I will add a 175w. Since the 260 will use the 8 pin hook up can I use the 8 to 12 pin adapter so I can attach to one xsv unit ?? The second station is just a plain 7612.

Or what is best for high speed bait ball detection while scouting the surface for paddies?? Would like a wide angle.

Last edited by Albi hunter; 05-30-2016 at 09:30 PM.
Old 05-31-2016, 04:04 PM
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I have the new B285HW high freq chirp at a 25 degree beam.

I was able to lock bottom 23kts at 1100'
Old 05-31-2016, 05:04 PM
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Thanks Papa J. Did you have that ducer on last season? Did you meter bait while cruising at that speed ?
Old 05-31-2016, 05:59 PM
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Originally Posted by Papa "J" View Post
I have the new B285HW high freq chirp at a 25 degree beam.

I was able to lock bottom 23kts at 1100'
B275hw?
Old 05-31-2016, 06:06 PM
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Yesterday was the 1st offshore trip. Bought the boat last December and upgraded the electronics in February
Old 05-31-2016, 08:01 PM
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Originally Posted by VanW View Post
B275hw?
no B285HW....its a newer transducer.

same as this
http://www.airmar.com/productdescription.html?id=61

just 25 degree high freq chirp

http://www.airmar.com/uploads/brochu...Comparison.pdf

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