295 on Simrad Combi D

[Nick]

Hi,

I just want to check here. Is it anyone tried to connect FCV295 on Simrad Combi D transducer 38/200 KHz? Maybe Furuno tested, I don t know, I m just asking?
Thanks

 

[Snips]

Nick,
Early on we tried a couple of Simrad Combi transducers that were supposed to be "1Kw" rated. They worked great for about three minutes, turns out they weren't 1kw and had a much lower power rating. Since then we have been very cautious about connecting to them. If you want to try I would advise using the "A" TAP setting on both frequencies and starting with an output power setting of 5.

Snips

 

[Nick]

Thank you Snips,

Is it tap A the lowest impedance setting? This transducer is on 75 Ohms. I would like to know what is an impedance of tap A?

Thank You very much


Nick

 

[Snips]

Nick,
The truthful answer is I don't know what the backward impedance into the FCV-295 is. As you probably already know that there are quite a few elements that are figured into a transducers "Impedance" value, like Parallel Resistance/Capacitance, Parallel Conductance/Susceptance, Series Resistance/Reactance, Phase angle and others. All these values change with frequency also.

If I had a Simrad machine with a Combi transducer I could put an O'scope on the sounders output to measure the VP-P that was being transmitted, unfortunately I don't.

Just know that the TAP settings are a course output power adjustment with the "A TAP" being the lowest. The FCV-295 also has a 1-10 output power control in the TX/RX menu which you can further reduce the sounder TX output power. So at this point I would rather ping the transducer will a little less power than to over drive it and take the risk of damaging it.

Snips

 

[Nick]

Snips,

thank You for Your reply. Yes, I know enough about the impedance matching and I have many experience with that. I was just wondering about the real part of impedance because it is a good starting point. :sorry
Once again thank you for your reply. Now I have a little more information. As I supposed is not easy to connect this transducer to another fishfinder (in this case Furuno). :think