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Garmin 547xs and Airmar B75M or B75L vs. TM150

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Garmin 547xs and Airmar B75M or B75L vs. TM150

Old 07-16-2013, 07:18 PM
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Default Garmin 547xs and Airmar B75M or B75L vs. TM150

I just traded in my Garmin 531s for the 547xs and Iím not looking for the perfect CHIRP Transducer to go with the unit. The 547xs has 600W in the CHIRP mode, and the BM75 thru-hull transducer is a 600w transducer. According to Airmar, the B75M has an operating frequency of 80-130 kHz with a beamwidth of 24/16, and the B75H as an operating frequency of 130 Ė 210 kHz and a beam width of 15/9, and the Garmin T150 a 300 W transom mount with an operating frequency of 95 Ė 155 kHz and a beam width of 26/17. Okay, I fish primarily for Salmon in 100 feet to 300 feet depths. Everything Iíve read says you get the best results from a thru-hull transducer. So, of the two Iíve listed by Airmar, which one (B75M, B75H) is going to give me the best readings? Iím leaning towards the B75H as its frequency run from 130 Ė 210 kHz, but itís got a pretty narrow beam width. So, Iím tossing my question to the experts. Please advise.
Old 07-16-2013, 07:19 PM
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I just traded in my Garmin 531s for the 547xs and I’m now looking for the perfect CHIRP Transducer to go with the unit. The 547xs has 600W in the CHIRP mode, and the BM75 thru-hull transducer is a 600w transducer. According to Airmar, the B75M has an operating frequency of 80-130 kHz with a beamwidth of 24/16, and the B75H as an operating frequency of 130 – 210 kHz and a beam width of 15/9, and the Garmin T150 a 300 W transom mount with an operating frequency of 95 – 155 kHz and a beam width of 26/17. Okay, I fish primarily for Salmon in 100 feet to 300 feet depths. Everything I’ve read says you get the best results from a thru-hull transducer. So, of the two I’ve listed by Airmar, which one (B75M, B75H) is going to give me the best readings? I’m leaning towards the B75H as its frequency run from 130 – 210 kHz, but it’s got a pretty narrow beam width. So, I’m tossing my question to the experts. Please advise.
Old 07-16-2013, 07:21 PM
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Originally Posted by Snook200 View Post
I just traded in my Garmin 531s for the 547xs and Iím not looking for the perfect CHIRP Transducer to go with the unit. The 547xs has 600W in the CHIRP mode, and the BM75 thru-hull transducer is a 600w transducer. According to Airmar, the B75M has an operating frequency of 80-130 kHz with a beamwidth of 24/16, and the B75H as an operating frequency of 130 Ė 210 kHz and a beam width of 15/9, and the Garmin T150 a 300 W transom mount with an operating frequency of 95 Ė 155 kHz and a beam width of 26/17. Okay, I fish primarily for Salmon in 100 feet to 300 feet depths. Everything Iíve read says you get the best results from a thru-hull transducer. So, of the two Iíve listed by Airmar, which one (B75M, B75H) is going to give me the best readings? Iím leaning towards the B75H as its frequency run from 130 Ė 210 kHz, but itís got a pretty narrow beam width. So, Iím tossing my question to the experts. Please advise.
The word "Not" above should be "Now" sorry!
Old 07-16-2013, 07:44 PM
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For Salmon at 100' to 300' you can get excellent results with all these CHIRP transducers including the TM150m.
I cannot see any losers here..all will give outstanding results on a schooling fish such as salmon.
The B75M would be my choice for a thru hull as it is a good compromise...24 to 16 degrees will give more than adequate coverage and I really like the frequency range for salmon.

If you go to the B75H you still win..just a bit less coverage....there are no real negatives here.
Even the Tm150M is going to really impress..if certainly has impressed me.
The Garmin 547xs in CHIRP mode with any of these CHIRP transducers will put you on the fish with accuracy and detail.

You can always start with theTm150m..if you are not happy you will be able to sell it for almost your cost and go to the next level.
Old 07-16-2013, 08:06 PM
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Thank you! I'm finally talking with someone who answers with conviction! I appreciate it.
Old 07-16-2013, 08:10 PM
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Originally Posted by semperfifishing View Post

You can always start with theTm150m..if you are not happy you will be able to sell it for almost your cost and go to the next level.
If I purchase a Tm150m from you, will you promise to purchase it back from me at "almost" my cost!? Please let me know what "almost your cost" is so I can sell it back to you if I don't like it.
Old 07-16-2013, 09:07 PM
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I would like to probe this 80 – 130 kHz verses 130 – 210 kHz a little more if I may. It’s my understanding the higher frequencies result in better target resolution, but with that comes a smaller field of vision, hence the 15⁰ - 9⁰ view. You recommend the 80 kHz to 130 kHz because of the 24⁰ - 16⁰ field of vision. Am I decreasing target resolution significantly by stepping down to 80 – 130 kHz in say 200 feet of water to pick up roughly a 9⁰ swing in field of vision, or is my resolution not significantly improved with the 130 – 210 kHz in 200 feet of water to justify the smaller field of vision? If I’m using the mid-range (80 – 130 kHz) would the chart show the downrigger balls? Would the high frequency (130 – 210 kHz) pick up the downrigger balls? Thanks and sorry for the questions.
Old 07-16-2013, 09:18 PM
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For a traditional tone burst sonar the higher frequency such has 200 kHz is certainly better than the lower freq 50 kHz in regard to resolution.

With a CHIRP system comparing the 130-210 and 80- 130 bands on a B75 would be very difficult to see any difference by eyeballing.
With either transducer you will see VERY clear targets on the screen especially with a school of salmon at 100' to 300'
Both will put you on the fish.

Since you are using down riggers I would opt for the wider cone.

Last edited by semperfifishing; 07-17-2013 at 04:07 AM.
Old 07-17-2013, 05:03 AM
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There is a thread on here with exactly that in screen shots. Showing the down riggers and salmon hitting the bait. The transducer he used would probably be your ideal choice. I'll post a link if I can find it.

Here is the thread, read through it, excellent information for you I think. CHIRP Thread

Last edited by stiletto; 07-17-2013 at 05:24 AM.
Old 07-18-2013, 09:40 AM
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Default Garmin 547xs and B75M or TM150M

Iíve one more question regarding the B75M and the TM150M transducerÖ Hereís my problem, in order to install the B75M Iíve got to move a live well pump/thru-hull strainer over about 6Ē, which I can do as Iíve got the room, but the question is; ďwill the work be rewarded with a superior screen image on my 547xs? Does the B75M notably improve the screen image over the TM150M in 50 feet to 300 feet of salt water to warrant moving the pump? I primarily fish for Salmon, but Iím all the times looking for Halibut on the bottom. Am I simply being anal about the whole process?
Old 07-18-2013, 09:50 AM
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I have B75H and TM150M, I prefer B75 by far over TM150M both due to mounting style and performance.
Old 07-18-2013, 11:08 AM
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Originally Posted by Snook200 View Post
Iíve one more question regarding the B75M and the TM150M transducerÖ Hereís my problem, in order to install the B75M Iíve got to move a live well pump/thru-hull strainer over about 6Ē, which I can do as Iíve got the room, but the question is; ďwill the work be rewarded with a superior screen image on my 547xs? Does the B75M notably improve the screen image over the TM150M in 50 feet to 300 feet of salt water to warrant moving the pump? I primarily fish for Salmon, but Iím all the times looking for Halibut on the bottom. Am I simply being anal about the whole process?
I will put it to you this way...

At your fishing depths and for schooled salmon you will not miss any fish with the Tm150 vs the B75.
But the B75 being a higher quality transducer and being mounted in cleaner water will give better overall detail.

I will do this for you..
I will sell you a TM150m..use if for 30 days and if you think you are missing out I will give you full trade in for a B75.
A win win situation..
Except for the fish...
Old 07-18-2013, 11:41 AM
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Originally Posted by semperfifishing View Post
I will put it to you this way...

At your fishing depths and for schooled salmon you will not miss any fish with the Tm150 vs the B75.
But the B75 being a higher quality transducer and being mounted in cleaner water will give better overall detail.

I will do this for you..
I will sell you a TM150m..use if for 30 days and if you think you are missing out I will give you full trade in for a B75.
A win win situation..
Except for the fish...
What price?
Old 07-18-2013, 11:47 AM
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I already PM'd you.
Old 07-18-2013, 12:50 PM
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I have a 547 connected to a TM150 the reason I don't use the B75 is my gear is moounted on a Boston Whaler so I'm not a real fan of drillin holes on the bottom of my boat.

I've been very happy with the performance of the TM150. I fish in saltwater 3 - 1000'.






















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