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Need Some Transducer Mounting Help

Old 09-30-2014, 07:44 AM
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Default Need Some Transducer Mounting Help

Hopefully the pictures will be self explanatory. I changed from the stock Garmin ducer to the p66. The p66 is in the same place and seems to be mounted according to the directions. But as you can see by the output, the results are not ideal. Sitting still or going slow, it is OK, not perfect as I have to turn the gain down further than I am used to, but not the trash you see on the 200mhz screen when under way. Sorry about the picture quality, hopefully it will be good enough. Thanks all. Oh. One battery for house and starting. Any other questions, please ask. I need help. If I can't see the fish, we can't catch them except by dumb luck.





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Old 09-30-2014, 07:57 AM
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I'd try to lift it up a notch. The angle is adjustable right?
Old 09-30-2014, 08:28 AM
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Originally Posted by VanW View Post
I'd try to lift it up a notch. The angle is adjustable right?
It comes with a wedge. The directions have a range to use for transom angle (not deadrise). My transom angle is no wedge, but I could grind the wedge to make the angle near exact. Right now it is mounted exactly according to the directions, with the template. Angle within range, and height where recommended. But I need some guidance, because that is not working well. So I guess that is my question. What may be causing the disturbed look at 200 mhz when moving? And why do I have to turn the gain down compared to the stock ducer. I guess I'm closer to 70% or a little lower, than the mid 70's I'm used to. I tried turning off the hdi ducer, no effect. Could it be water disturbance? electrical? I see that the pictures don't show it very well, but they are mostly vertical lines cluttering the screen.

Oh. The split screen is 200 on the left and 50 on the right. The hdi on the other ducer and screen not pictured is on 455.
Old 09-30-2014, 08:50 AM
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I'm not an expert but I've read that vertical lines (although I've never seen them that bad) is interference from another transducer. The reason you have to turn the gain down might be because the p66 is more sensitive that the old transducer. But again I'm no expert.
Old 09-30-2014, 02:23 PM
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Originally Posted by VanW View Post
I'm not an expert but I've read that vertical lines (although I've never seen them that bad) is interference from another transducer. The reason you have to turn the gain down might be because the p66 is more sensitive that the old transducer. But again I'm no expert.
I read up a little before I asked and it seemed the interference was more likely and significant if the transducers were on the same frequency. I have the hdi on 455 and the conventional on some combination of 50/200. And I have turned off the hdi, no difference.
Old 09-30-2014, 05:52 PM
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Like turned the power off completely?
Old 09-30-2014, 06:57 PM
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Yes. To see if it was interfering.
Old 10-01-2014, 12:51 AM
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Regarding the gain, P66 will be a fair bit more sensitive than that OEM it replaced, so that would explain the need for less gain.

The position you have it in looks pretty good to me. I doubt if it is so deep to be causing issues, it is more likely that it just needs some tinkering with settings to get it really humming.

Most of the pictures you posted look not too far off, maybe drop the gain down a bit more. There are lots of fish and schools of bait showing that I can see fairly clearly in the blurry pictures. You should be able to catch them!

It seems to be mainly the split screen shots in the last few that are concerning you? Can't see what frequency the left side is set to?

Not all that familiar with the Garmins, is there a setup screen where you need to tell it what transducer it is connected to like in thenLowrance sounders? You might have to specify the P66 in that menu and that would usually result in better images straight away.
Old 10-01-2014, 08:57 AM
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Yes it's the last few split screens. The full screens are sitting still or drifting. The split screens are moving. The screen that goes goofy is the 200 MHz side. Choosing a transducer is not an option on this sounder. There is just a dual freq or split frequency choice.
Old 10-01-2014, 10:39 AM
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It's weird that the 200 is so noisy while moving and the 50 is not. It has to be some kind of interference. The drifting shots are they with the motor on? Are the full screens 200?
Old 10-01-2014, 01:32 PM
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I was 100% banking on and counting on the screenshots being legible. Well, they are not. Drifting shots are motor on but low rpm. I did not just rev up un neutral to see if that had an affect. I'm not positive if the full screen is 200 or 50, but the screen display is similar between the 50 and 200 when not moving. In such shallow water I do use the 50 to get some more coverage until I find a spot worth checking more closely.

I do have the extra ducer cable coiled and cable tied in the stern cubby attached to the steering cable about a foot away from the battery. The other ducer, I had the extra cable coiled under the console attached to the trunk loom.

My plan for this week is to grind/trim the wedge to get it perfectly level with the bottom. Whether to up or down is still being thought about. And I will move the coil of extra cable to the console if you guys think that would make a difference.

If you guys think it would be a fix, I would get a house battery and put it under the console. Totally separate both of the sounders from the starting/charging system. And charge the sounders battery with a solar charger. I will do that. Question: Will a group 31 battery run 2 - 5inch screen depthfinders for 10 or 15 hours without charging?
Old 10-01-2014, 02:25 PM
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I'd try moving the cable before I ground the wedge. You should email airmar maybe they've seen something like it before. For all we know it could be a transducer problem. It's too bad you're not sure if the clear screens are 50 or 200, but judging by your split screens I'd say they are 50.
Old 10-02-2014, 01:15 PM
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Originally Posted by VanW View Post
I'd try moving the cable before I ground the wedge. You should email airmar maybe they've seen something like it before. For all we know it could be a transducer problem. It's too bad you're not sure if the clear screens are 50 or 200, but judging by your split screens I'd say they are 50.
Route the cable to the instrument being careful not to tear the cable jacket when passing it through the bulkhead(s) and other parts of the boat. Use grommets where appropriate. To reduce electrical interference, separate the sensor cable from other electrical wiring and the engine(s). Coil any excess cable and secure it in place with cable ties to prevent damage.
What does "To reduce electrical interference, separate the sensor cable from other electrical wiring and the engine(s)" mean? How do you separate? Everything comes from the same place and goes to the same place and there is only one way to get there? Is the shielding insufficient? Is there supplemental shielding i should consider?
Old 10-03-2014, 06:14 AM
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what is the problem? I didn't see anything concerning. If you are concerned about the split screen view at 12-13' then that appears to just need an adjustment to the gain offset of one of the frequency's Rarely if ever a screen showing 50khz and 200khz will have the same look, as one or the other's gain will not be right. you should be able to go in the menu and adjust the offset so that the gain will be correct both both freq, when viewing them at the same time.
ps. the transducer looks too close to the trim tab for my liking.

Last edited by knotreel; 10-03-2014 at 11:03 AM.

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