2 Transducers

[Capt Carl]

Hey guys, Airmar makes most of the transducers that are sold by Furuno, Raymarine, etc. The sounder sends the signal to the respective transducer, and then interprets the return signal. You will experience interference if you run two at the same frequency at the same time. As mentioned, you can use the same transducer for two sounders as long as there is a selector switch. Be careful that both sounders are of the same power level, ie. both are say500 watt units. A higher power sounder connected to a lower capacity transducer can burn it out.

Two sounders is a good idea. I have a 2kw Furuno on the bridge, and a 500w unit in the cockpit. Each has its own transducer of the correct power and frequency rating. Only one can be run at a time or there is interference.
Hope this helps.

[T380Fisher]

Will let you know in about a month....I installed an airmar258 (1kw) with my new electronics this spring. It runs through a FF520 black box which is supposed to tune the signal. I was running a Raytheon V850 and left it installed as a backup. I am interested to see if the 520 tunes out the older Raytheon unit.

Will let you know.

[Nauti Natured]

Just to reiterate what others have said. You will never be able to run two transducers at the same time. They will pick up eachothers return causing interference.

[lazyfatass247]

Yeah i got that thanks guys for the info. I will install the other transducers in the boat as a backup.

[Fissues]

I have three ducers and run them at different frequencies. Works great with no interference.

[Capt Lindsay]

I have two transducers, one for each of two depth finders. One is a Raymarine unit with an Airmar transducer that operates at 50 or 200 kHz. The other unit is a Datamarine Digital and it operates at 55 kHz. I run them both at once with no interference.

Each transducer listens for a return signal at the frequency that it transmitted. The unit measures the time between sending the signal and receipt of the return divided by two divided by the speed of sound through water. Transducers are tuned and as long as you operate the units at different frequencies, there will be no interference.

If you have equipment that is set up for dual frequencies, you can usually use both frequencies at once and the unit works fine. It provides a window on the screen for the picture from each frequency.

[megabite]

I have a Garmin and a Raymarine Through hull both transdeucers are Airmar with 12 inch fairing blocks .They are about 3 feet apart on my 23 SeaCraft and they do intefear with each other but not bad enough to turn one off usually.I think on my big boat the Deucers are about 15 feet apart and they dont intefear at all. On my 23 footer I have tried one on 50 kw and one on 200 kw they still show intefearence.I think the further apart they are the better.

[ice cream man]

Got 2 basic Garmin transducers on my Cat - both on different sponsons & yes they do interfere with each other at times.........Looks like diagonial lines on the screen - when that happens I run one as a full screen GPS & the other as Sonar........
Really like having 2 double units, especially when running - one for navigating & the other for reading the bottom........ICM