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side by side sonar transducers

Old 02-04-2007, 05:33 PM
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Default side by side sonar transducers

Is anyone running two transducers side by side?

Does it work?

Thanks
Eric
Old 02-04-2007, 08:41 PM
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Default Re: side by side sonar transducers

Yes, if you get some seperation in the frequencies, like running one @50khz and one @83,192,200,or455 if they are running the same frequ. you will get cross talk and the stronger unit wins. I am running a Simrad 33ce and a Humminbird Matrix 97.
Old 02-04-2007, 09:44 PM
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Default RE: side by side sonar transducers

I'm running a 50, 120 sitex, and a 200 khz tranducer all at once. No interferance at all, but the 50 khz is sort of usless most of the time. Two transom mounts and one in-hull.
Old 02-04-2007, 09:54 PM
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Default Re: side by side sonar transducers

Thanks guys. I am thinking of running two lowrance 337s side by side. One for gps and one for sonar. I might also use one at 50k to watch downriggers and have the other set to 200 k.
Old 02-06-2007, 04:46 PM
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Default Re: side by side sonar transducers

I beleive lowrance sells a transducer switch so you can change which head unit is reading from the transducer. I have a raymarine on my starboard transom and a lowrance on my port transom. They do interfere slightly with each other, even at different frequencies. A vertical line appears on both screens ever 5 seconds or so. I usually just run the lowrance (111) as the detail blows away the ray (L750).
Old 02-10-2007, 12:48 AM
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Default Re: side by side sonar transducers

I run a Lowrance unit @ 200khz and a Si-tex at 120khz at the same time w/ no issues.

Once tried two Lowrance units @ 200khz and no way that set-up going to keep me happy.
Old 02-10-2007, 03:02 PM
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Default Re: side by side sonar transducers

Nightides, you are well clear of the freq separation issue.

(1) Transducer should be mounted a minimum of 18-inches apart.

(2) Transducers should be separated by a minimum of 20% of the frequency.


Edit: I believe it was 20% of the lower freq, so your 120kHz transducer is ok with anything running at (120kHz x 1.2) 144kHz or higher. You should be ok with a 150kHz ‘ducer 18-inches away from your 120kHz 'ducer, if you wanted to go there.

Also, transducers should be mounted a minimum of 18-inches apart to be sure there is no electrical (EM) interference between the two, either.


Old 02-11-2007, 06:45 PM
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Default Re: side by side sonar transducers

The 50/200 run at the same time, so just selecting to view one or the other on the screen has nothing to do with shutting one or the other off. This means if one 337 is displaying the 200 and the other is displaying the 50, you will still get interference because again both are running in each transducer. Unplug the transducer for the unit you are using as a GPS.

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