Thread: 788ci quadrabeam

Originally Posted by gotta_fish

Im not completely sure but I read the Qbeam just read out to about 2x's the depth of the water your in and I dont think you can set it to read farther .. I just installed mine today and I'll see what it looks like tonight.Mine is installed on tm and on seperate mounts i'll have to move my unit also Maybe Greg can chime in

The coverage area of the QuadraBeam transducer is 2X the water depth (most 2D sonar beams cover much less area than that).
The QuadraBeam transducer should read down to 160 feet deep.

I have a switch will this switch work with 2 transducers on 1 fishfinder .it has a toggle a/b switch 2 female tranducer plugs 1 male transducer plug and a small plug for the power plug,Im not sure of any numbers on it and was just wondering if its for 2 transducers into 1 fishfinder ,was hoping it will work on my 788ci ,into my duel beam and q-beam,any help will be appriciated

Guess I might have to start a new thread on this subject

Hmmmm, good question there gotta_fish. That looks to be the transducer switch for the old 3D units. I don’t have a wiring diagram nor one to test with, so I don’t know how it will work. That thing is pretty old…

The guy I got it from used it on a HB wide 100,I know it will plug in to my unit and both transducers, but im SKEERD to power it up ,I was hoping to get some more info on it before I tried it .Thanks for looking at it maybe you can find out something for me before I foot the $80 or so bucks for a new one .Sorry !I really hate bothering you ,Thanks for the help.

That switch is so old that there is no electronic data on it – everything was hand drawn back then. I would connect it up and test it but only for a minute. It will either work correctly or you will not see a bottom depth reading (depending on which way the switch is set).

If you have access to an ohm meter or a test light you could check and see if all of the pins that the QuadraBeam transducer would use are switched between the larger female connectors and the larger male connector.
[The smaller flat two pin connector was for the 2D sonar on one of our 3D units. There is no power connection to this switch.]