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fishmaster LOW

Interference Issues with Dual Lowrance Transducers

Question

Hello all, I'm having a bit of an intereference issue when I am running two HST-WSBL transducers both mounted on the transom. Wondering if I can change some settings on my Sonar units to combat this issue. I have a Lowrance X102c at the console and a LMS-332c mounted at the stern. Right now the X102c shows the most interference when both units are turned on and I have tried to play with the settings somewhat to try get things running smoothly. Mainly changing ping speed and the intereference rejection settings. Anyone else run into the same problem before?? Any suggestions much appreciated!

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With those transducers and units you will not be able to "tune out" the interference. The ping speed and rejection settings that you mentioned are the only options you have to remove the interference and they won't get rid of it. You'll have to move the transducers farther apart, or turn off 1 of the units. FYI even if both transducers are as far apart as possible on your transom, you'll still get interference once you get deeper than 10 fow or so.

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Thanks for the reply PerchJerker, I was afraid someone was going to say that. Should I look at getting a thru hull transducer? I have a fiberglass boat and think I could mount that towards the middle of the hull.

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Mabie perchjerker can check to see if you could buy a dual frequency transducer for the 102C, and then under your settings choose the 50khz frequency only. Your 332C will run at the standard 200khz and they should clear up for you. Or vice versa on the 332C.

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I don't think you can use dual frequency with the 102 or the 332. The DF transducer would connect to the unit but I don't think the software would let you use it on 50 kHz. In that era of units you had to have the 107 or the 337 to get dual frequency operation.

About the shoot-thru-hull transducer, you typically mount them in the center of the bilge as close to the transom as possible. As you move forward you start to run into 2 issues --- 1 is that the hull needs to be in the water for the transducer to read so they won't work up there on plane --- 2 is that you want them to be mounted flat (parallel to the lake bottom) and as you move forward the hull will be less and less flat (so harder to get a good reading). If you try the shoot-thru-hull route you could try siliconing the transducer in first, you wont' get as good of a reading as an epoxied transducer, but silicon is removable. If it works you could epoxy it in later. You could even try this with one of your skimmer transducers if you want.

But .... the general rule is that those transducers if 18 feet apart start to interfer around 30 fow. So even if you have them 9 feet apart (approx 1/2 way forward in your boat) you're still looking at only 15 fow before you get interference.

Why not just turn off the graph you're not using?

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But .... the general rule is that those transducers if 18 feet apart start to interfer around 30 fow. So even if you have them 9 feet apart (approx 1/2 way forward in your boat) you're still looking at only 15 fow before you get interference.

Good info, thanks perchjerker.

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I agree... Good information! I think I am just going to keep my current setup and do what PerchJerker suggested - turn off one of the graphs. Basically I want to be able to take that 332 and move it to either the bow or stern depending upon where people are fishing. Handy to have it at the stern when I'm trolling or drifting and at the bow when I'm running the electric Minn Kota. Would be nice to upgrade everything so that I can network things together better but that's too much $$$... Thanks for the input!

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A word of caution on ducer placement on the transom, if they are set too far to the side you will loose high speed readings due to turbulence, air bubbles, or cavitation.

So.. if one of the two ducer's on the transome is needed for high speed running the more to the center of the transom you set it, the better.

Interference from cross talk on many units can often be managed with adjustments to one of the units PING SPEED settings, but not always. Most 500 series and up units can be tweaked in the ping speed settings to lessen or eliminate the cross talk.

If one is a duel beam and the other in not, set the duel opposite in frequency when running both, this will also eliminate it. A trade off needs to happen someplace and often that is the best option of all to manage the cross talk.

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