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Simrad Go9 Thru Hull Transducer

Old 09-13-2019, 02:48 PM
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Default Simrad Go9 Thru Hull Transducer

Hello. I currently have a Simrad Go9 with the transom mount transducer (50-200) that came with it on a Trophy 1902 WA. I am ready to install a thru hull transducer. I called Airmar today and they told me that the Go9 is a 500 watt sounder. I fish mostly for Salmon in Puget Sound and some trout in Lake Washington. I am looking at the Airmar B75H or B75M. I have never used the CHIRP before. Is it okay go with the 600 watt transducer even though the Go9 is only produces 500 watts? I see that there is also the B150M that has CHIRP but is only 300 watts. I would imagine that installation would be the same for either transducers. Thank you for any advice you can give me.
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Old 09-13-2019, 02:59 PM
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GO XSE has somewhere between 600W and 1kW transmit power. I've measured it so I know the number, but I don't want to post the exact number.

It will will do a good job with any 600W or 1kW CHIRP transducer. B75H is a good choice for bottom fishing (CHIRP mode) and will be good for fish in the water column at 130 kHz fixed frequency. If you only look for targets in the water column B75M is probably a better choice.
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Old 09-13-2019, 07:58 PM
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Thank you very much for the quick reply. So if I am more focused on targets in the water column I can just use the B75M in CHIRP mode all the time?
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Old 09-14-2019, 12:01 AM
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Simrad GO XSE series has adequate power to drive a 1KW chirp transducer like the medium chirp TM185M in excess of 300' (109 meters) of depth. It is not so much the sonar power per sec, as the quality of the utilized transducer, with larger crystals and low Q factor, and the inside processing electronics that makes the difference.

Below is a snapshot of GO9 XSE with TM185M at 109 meters depth scanning close to the bottom for large groupers/redfish in the Aegean sea in Greece. A bit of excess of zoom X6 was used for exaggerating the incredible separation of targets achievable with a quality chirp transducer. You can also see very clearly the trace of the bait going down to lure the fish. So do not worry too much about sonar power!


Simrad GO9 XSE with TM185M

Last edited by hipath; 09-14-2019 at 12:09 AM.
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Old 09-14-2019, 08:33 AM
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Originally Posted by rivetboy1 View Post
Hello. I currently have a Simrad Go9 with the transom mount transducer (50-200) that came with it on a Trophy 1902 WA. I am ready to install a thru hull transducer. I called Airmar today and they told me that the Go9 is a 500 watt sounder. I fish mostly for Salmon in Puget Sound and some trout in Lake Washington. I am looking at the Airmar B75H or B75M. I have never used the CHIRP before. Is it okay go with the 600 watt transducer even though the Go9 is only produces 500 watts? I see that there is also the B150M that has CHIRP but is only 300 watts. I would imagine that installation would be the same for either transducers. Thank you for any advice you can give me.

For your area and fishing requirements.....I would recommend the B75 M...if you wish a thru hull.

A transom option.... is the transom mounted 3 in 1 Active image.

Last edited by semperfifishing; 09-14-2019 at 09:28 AM.
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Old 09-14-2019, 08:44 AM
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Thank you for the Go9 screen shot. Since I have only the used the transducer that came with the Go9 I am thinking that is the reason why it has been disappointing. The access to the bilge in my boat is rather small. It would be possible but difficult to install a thru hull transducer. Should I just go for the thru hull or would a TM185 be almost as good. I have never been able to see the bottom while on plane. I am not sure if that is TM adjustment or the fact that it is a $100 transducer.
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Old 09-14-2019, 09:11 AM
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Originally Posted by rivetboy1 View Post
Thank you for the Go9 screen shot. Since I have only the used the transducer that came with the Go9 I am thinking that is the reason why it has been disappointing. The access to the bilge in my boat is rather small. It would be possible but difficult to install a thru hull transducer. Should I just go for the thru hull or would a TM185 be almost as good. I have never been able to see the bottom while on plane. I am not sure if that is TM adjustment or the fact that it is a $100 transducer.
Depending on the depths you are usually fishing there is a variety of through hull transducers to select from. If you also want cover of the water column, and you not fish over 300', the 600W B75M as pointed out by others is an excellent choice. If you only care for bottom fishing then opt for B75H. The Airmar B75 600W series has a much smaller installation diameter than the much larger and more powerful 1KW B175 series models, and probably will be easier to fit on your vessel. Of course if you have available space you can opt for the more powerful 1KW models like B/SS 175M or H.

As for single frequency transom mounted transducers there are only three available at the moment, TM185M which is 1KW, TM185HW 1KW and the new 600W TM165HW. The medium chirp TM185M would be also an excellent choice, but you have to keep in mind that transom mounted transducers are very sensitive to placement and hull characteristics, so reading bottom at speed is often very hard to achieve.

You also have the option of an in hull transducer, like the 1KW M135M medium chirp transducer, which is also popular in our waters when other installation options are not available. Also available is the less powerful 600W P75M in hull medium chirp transducer, which is a cousin of the through hull B75M but much less expensive and probably the best value for your money if you want to experiment with a quality chirp transducer.

Last edited by hipath; 09-14-2019 at 10:51 AM.
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Old 09-14-2019, 09:33 AM
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There are 2 single freq 1kw CHIRP transoms....the TM185C-M, TM185C-HW .
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Old 09-14-2019, 09:58 PM
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I couldn't see in Simrad documentation that Simrad go 9 supports 1 kW transducer. I may have missed it.

1 kw support with 1 kW run different. The transducer is not used in full performance.
If Go 9 don't support 1 kW, it makes more sense to choose a 600w transducer.

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Old 09-15-2019, 12:48 AM
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You don't understand what's the main advantage of a 1kW Airmar transducer. If we compare P66 with a TM260 so is TM260 13x as sensitive at 200kHz and 50x as sensitive at 50kHz. The difference between 600W and 1kW will only give a difference of a factor 1.67 in the transmitted energy. Sensitivity is the transducers ability to transform electrical signals to acoustic energy when transmitting and the opposite when receiving.

The sensitivity of the transducer is far more important than the transmit power. A TM260 operated at 100W would give superior results compared to P66 operated at 600W. I'm using P66 and TM260 as an example since the difference in sensitivity for these are well documented by Airmar, but the principle also applies to CHIRP transducers. The main difference is not transmit power, but that Airmar transducers with higher max transmit power have higher sensitivity.

But as I've written previously in this thread the GO series has somewhere between 600W and 1kW transmit power so it will drive a 1kW very well. I've received screen shots from a guy fishing at the Norwegian west coast showing Lowrance Elite Ti with TM185M at 300-400m, the performance was good. Elite Ti and GO series have the same sonar module integrated.
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