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-   -   Duel transducer question (https://www.thehulltruth.com/marine-electronics-forum/619631-duel-transducer-question.html)

Jeepman 09-11-2014 05:57 AM

Duel transducer question
 
Currently I have a airmar shoot thru hull transducer going to a raymarine c80. I want to move the transducer it to a garmin 740s. Also going to add a 740xs with chrip. My question is can I run the airmar shoot thru transducer on the 740s for shallow water and the chrip transducer on a 740xs for deeper water at the same time? Do not want them to interfere with each other.

Thanks for any info and help

VanW 09-11-2014 06:24 AM

You can probably do it with the Garmin 8 pin adapter box. The airmar site has a lot of diagrams.

semperfifishing 09-11-2014 10:05 AM


Originally Posted by Jeepman (Post 7099341)
Currently I have a airmar shoot thru hull transducer going to a raymarine c80. I want to move the transducer it to a garmin 740s. Also going to add a 740xs with chrip. My question is can I run the airmar shoot thru transducer on the 740s for shallow water and the chrip transducer on a 740xs for deeper water at the same time? Do not want them to interfere with each other.

Thanks for any info and help

It depends on what model CHIRP transducer you are adding..
Your current shoot thru will be a 50/200 kHz.

Which CHIRP unit are your referring to?

If you add a CHIRP B175 M for example ...it has a freq range of 85 kHz thru 135 kHz...so that would not interfere.

Jeepman 09-11-2014 10:17 AM


Originally Posted by semperfifishing (Post 7100259)
It depends on what model CHIRP transducer you are adding..
Your current shoot thru will be a 50/200 kHz.

Which CHIRP unit are your referring to?

If you add a CHIRP B175 M for example ...it has a freq range of 85 kHz thru 135 kHz...so that would not interfere.

Have not picked a chirp transducer yet, but if a 740xs with a B175 M will shoot down to 1500-2000' good then it would work.

VanW 09-11-2014 10:20 AM

That's pretty deep. I'm not convinced it can do it.

Jeepman 09-11-2014 10:29 AM


Originally Posted by VanW (Post 7100300)
That's pretty deep. I'm not convinced it can do it.


What do you think would be the max operating depth on a slow drift for the 740xs combined with the B175 M ?

VanW 09-11-2014 10:53 AM

I don't know, I hope it's able to but like I said I'll believe it when I see it on my own boat.

semperfifishing 09-11-2014 10:55 AM


Originally Posted by Jeepman (Post 7100294)
Have not picked a chirp transducer yet, but if a 740xs with a B175 M will shoot down to 1500-2000' good then it would work.

You "may" see bottom at 1500' but certainly not targets.

If going deep.. then the B175C-L has the greater depth capabilty.

Jeepman 09-11-2014 11:02 AM


Originally Posted by semperfifishing (Post 7100426)
You "may" see bottom at 1500' but certainly not targets.

If going deep.. then the B175C-L has the greater depth capabilty.

Does the B175C-L also have a freq range of 85 kHz thru 135 kHz ? I would like to be able to see targets in depths of 1000-1500', but do not want to give up anything in water depths in the 3-500' range to do so. Is there a depth range this transducer works best in?


Thanks for the help. In the coming months going to replace some older Eltcs and update my setup. I am extremly good at tuning sounders to do exactly what I want them to do, but dumb as a rock when it comes to how they work, how they talk to each other or what does and does not work with each other.

VanW 09-11-2014 11:09 AM

The B175C-L means low, the B175C-M = medium. So they will be different freq. Also I am not an expert in this but it looks like for what you want to do you may also need a dual band chirp system instead of or maybe even in addition to the single band. Or at least more than one transducer.

semperfifishing 09-11-2014 11:13 AM


Originally Posted by Jeepman (Post 7100444)
Does the B175C-L also have a freq range of 85 kHz thru 135 kHz ? I would like to be able to see targets in depths of 1000-1500', but do not want to give up anything in water depths in the 3-500' range to do so. Is there a depth range this transducer works best in?

.

The B175C-L has a freq range of 40 kHz-60 kHz...the lower the frequency the deeper the range..but also the L has less targeting capabilty .

To see a targets reliably in the 1000'-1500' range would be best using a 16 element transducer.

A Furuno FCV 295 with a 16 element transducer or a dual band CHIRP unit / 16 element such as a GSD-26 is what many opt for regarding working past 1000' and actually seeing targets.
Many transducers can see bottom deep ( 1000' and deeper) but seeing targets reliably is a different matter.

Jeepman 09-11-2014 11:33 AM

Thanks for all the info, will read up on them and see what I want to go with.


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