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Simrad NSS evo2 CHIRP Transducer Upgrade Help

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Simrad NSS evo2 CHIRP Transducer Upgrade Help

Old 06-07-2016, 12:49 AM
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Default Simrad NSS evo2 CHIRP Transducer Upgrade Help

I recently upgraded from a HDS7 Gen2 Touch to a New NSS12 evo2, I'm currently using the Structure Scan Transducer and the TM 83/200 Transducer that came with my HDS7. The 83/200 works ok but I loose bottom around 500ft, I want to swap it out for a thru hull transducer and I would like to take advantage of the CHIRP built into the Evo2. I have been trying to research all the options but I think I'm more confused than when I first started looking. I started out looking at the B150m that's around $300 then started reading and was leaning toward the B75M at around $650, now I'm looking at the B175M which is over $900.

I have read several threads from front to back on all these models and I still can't make an educated decision on which model is right for me. I don't know if I should use a Low, Medium or High frequency, a B75 or B175 and if the difference is not that great I would rather save the money to go toward the other electronics I want to add.

I do not have a BSM 2 or 3 so the b275LM or LH models are out of the question and I don't have the budget for them or adding the bsm. I still want to add autopilot and radar so the funds have to be spread around.

So on to the selection parameters.
We fish the east and west coast of Florida, on the west coast we are mostly bottom fishing for grouper and snapper at a maximum of 200ft. On the east coast we bottom fish anywhere between 30ft to 200ft with the occasional deep drop of 400Ft to 600ft and we troll for Dolphin, Tuna, Wahoo and Kingfish anywhere from 100ft to 1500ft.
I would like to keep the cost down to under $1k.
I need a low profile thru hull because where I will have to mount it is almost directly in front of the LSS transom mount transducer.

Also one other question is should I get the Navico specific model or the bare wire model and Navico pigtail?

Any help in the selection process would be Greatly appreciated!
Old 06-07-2016, 04:08 AM
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I would post this over in the marine electronics forum.
Do a quick search first, as there are a couple of threads that cover those three X-ducers.
Old 06-07-2016, 07:11 AM
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gil from semper fi a sponsor here helped me out with this same question. I ended up with the b75m with the navico connection not the pigtail. So far I like it just have to get out on the boat in some deeper water to dial it in. we fish the same depths you do.
Old 06-07-2016, 07:56 AM
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I suggest the B75 Give me a call anytime at 410 443 8555 to discuss further

Last edited by InternationalMarineBrian; 06-07-2016 at 08:10 AM.
Old 06-07-2016, 08:31 AM
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Originally Posted by captlucky View Post
I recently upgraded from a HDS7 Gen2 Touch to a New NSS12 evo2, I'm currently using the Structure Scan Transducer and the TM 83/200 Transducer that came with my HDS7. The 83/200 works ok but I loose bottom around 500ft, I want to swap it out for a thru hull transducer and I would like to take advantage of the CHIRP built into the Evo2. I have been trying to research all the options but I think I'm more confused than when I first started looking. I started out looking at the B150m that's around $300 then started reading and was leaning toward the B75M at around $650, now I'm looking at the B175M which is over $900.

I have read several threads from front to back on all these models and I still can't make an educated decision on which model is right for me. I don't know if I should use a Low, Medium or High frequency, a B75 or B175 and if the difference is not that great I would rather save the money to go toward the other electronics I want to add.

I do not have a BSM 2 or 3 so the b275LM or LH models are out of the question and I don't have the budget for them or adding the bsm. I still want to add autopilot and radar so the funds have to be spread around.

So on to the selection parameters.
We fish the east and west coast of Florida, on the west coast we are mostly bottom fishing for grouper and snapper at a maximum of 200ft. On the east coast we bottom fish anywhere between 30ft to 200ft with the occasional deep drop of 400Ft to 600ft and we troll for Dolphin, Tuna, Wahoo and Kingfish anywhere from 100ft to 1500ft.
I would like to keep the cost down to under $1k.
I need a low profile thru hull because where I will have to mount it is almost directly in front of the LSS transom mount transducer.

Also one other question is should I get the Navico specific model or the bare wire model and Navico pigtail?

Any help in the selection process would be Greatly appreciated!
Since most of your fishing seems to be in less than 600' I would suggest the B75M.

Also....do not get the bare wire and pig tail...get the NAVICO plugged version.




.
Old 06-07-2016, 08:41 AM
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Go B175M, the narrower cone will be a huge advantage for the grouper fishing.
Old 06-07-2016, 10:38 AM
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Thanks for your help guys.

Semper, my thought for getting the barewire unit with the pigtail is so that if I ever changed out my Simrad for a Garmin or other I could just change the pigtail and not have to swap the ducer. Am I wrong in this thinking, is there a benefit that I don't know about for getting the Navico model? Thanks.

Abbor, I thought the B175M and B75M shared the same beam width of 24° to 16° and the main difference was the 600w vs 1kw power rating? Also without the bsm will the higher power rating of the B175M make a difference when directly connected to my Evo2? Thanks.
Old 06-07-2016, 10:58 AM
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Also wanted to mention that even thought I don't need to mark fish deeper than 600' I would like to see bottom up to 1500', would the B175M be better for holding bottom at that depth?
Old 06-07-2016, 10:59 AM
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Originally Posted by captlucky View Post
Thanks for your help guys.

Semper, my thought for getting the barewire unit with the pigtail is so that if I ever changed out my Simrad for a Garmin or other I could just change the pigtail and not have to swap the ducer. Am I wrong in this thinking, is there a benefit that I don't know about for getting the Navico model? Thanks.
If you wanted to do that you could just cut the plug off. Better to get with a plug, wiring them is not the funnest thing around.
Old 06-07-2016, 11:01 AM
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Originally Posted by captlucky View Post
Also wanted to mention that even thought I don't need to mark fish deeper than 600' I would like to see bottom up to 1500', would the B175M be better for holding bottom at that depth?


Yes it will
Old 06-07-2016, 12:18 PM
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Originally Posted by captlucky View Post
Thanks for your help guys.

Semper, my thought for getting the barewire unit with the pigtail is so that if I ever changed out my Simrad for a Garmin or other I could just change the pigtail and not have to swap the ducer. Am I wrong in this thinking, is there a benefit that I don't know about for getting the Navico model? Thanks.

Abbor, I thought the B175M and B75M shared the same beam width of 24° to 16° and the main difference was the 600w vs 1kw power rating? Also without the bsm will the higher power rating of the B175M make a difference when directly connected to my Evo2? Thanks.
B175 has 11-16 degrees cone angle, Airmar has still not corrected all documentation.

The big difference between B75M and B175M apart from cones angles is not the maximum transmit power but the sensitivity. B175M will due to a much higher sensitivity transmit a much stronger acoustic signal with the same signal applied and with the same acoustic return produce a much higher voltage when in listening mode. B175M works very well when directly connected to NSS Evo2.
Old 06-07-2016, 12:25 PM
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The OP and I were just discussing on the phone the very thing posted above!
Old 06-07-2016, 03:23 PM
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Thanks Everyone for all your help!

I think based on the information provided by abbor and Brian on the higher sensitivity of the B175M it would be better for my application. The only downside is the smaller cone angle with less coverage in shallower water but then again it sounds like its better for target definition. I guess there is no have your cake and eat it too hear.

But overall I think I will be installing a B175M soon.

Thanks again!
Old 06-07-2016, 03:48 PM
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If you operate B175M at 85kHz fixed frequency in shallow waters you will get good coverage.

B175M at 85 kHz has comparable cone angle to B75H at 130kHz.

Originally Posted by abbor View Post
Some screen shots comparing B175H-W and B75H, and also B75H at different frequencies . I've used SonarHub and BSM-2, the MFD is NSS12.

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Old 06-07-2016, 05:42 PM
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Originally Posted by abbor View Post
If you operate B175M at 85kHz fixed frequency in shallow waters you will get good coverage.

B175M at 85 kHz has comparable cone angle to B75H at 130kHz.
Those images are amazing! I can't wait for mine to look that good.

I noticed you were using the B175H-W, should I consider upgrading even further to that model rather than the B175M? Just another $200, I started out looking at the B150M for $300 and I have "just another $200" myself into a $1000 unit. LOL

I understand the cone is bigger so that's an obvious advantage, any disadvantages with the High Chirp vs Medium chirp when in deeper water around 1500' ?

Thanks Abbor
Old 06-07-2016, 08:07 PM
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B175H-W is too wide for your application and the High CHIRP signals will have too high attenuation at larger depths.
Old 06-07-2016, 10:21 PM
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Originally Posted by abbor View Post
B175H-W is too wide for your application and the High CHIRP signals will have too high attenuation at larger depths.
One last question.
I will be installing this unit where my live well pickup used to be which is about 2' inboard and about 10" port(still starboard side) of my LSS2 transom mount, do you think there will be any interference issues? I know currently I can't run both at the same time anyway but from what I've read on other post is that a future software update will remedy this problem.
Old 06-08-2016, 06:11 AM
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The location sounds good but a picture always helps!

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