Transducer

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Apr 10, 2010
159
Hunter 26 Boca Chica, Rep. of Panama
H26 Transducer - Garmin 498 issue

About 6 months ago I replace the Uniden depth gauge on my H26. It was very hard to read from I guess exposure to the elements. I replaced it with the same flush mounted Uniden product. A month ago I went to go out on the boat and I noticed some moisture droplets inside the display. This is the lead up month to the rainy season here in Rep of Panama. The system was on only about five minutes and it starts beeping and didn't stop.

I pulled it out the next day when it was still not able to function. I was advised by the marina owner that this Uniden just isn't a serious depth finder. It had been just fine, oh well. I was going to have a wait a month to get a replacement or....

The owner had a Garmin 498 unit. I didn't need the navigation because I already had Navionics running on my netpc. However I wasn't going to go buy another Uniden and there was a month I'd have to go sailing without a depth finder. That really limits the range of sailing available to me.

It sounds like a hard sell trap I fell into, but it's not. There's a problem which I'm about to get into. If we can't solve it, we'll just pull the 498 Garmin which I haven't paid for.

The problem is: after running the system for about an hour the depth finder can't maintain a depth reading. It starts flashing the number and often get's stuck on the that number. It can not regain a reading. It has either a 50 or 200 mHz or both setting. This happens regardless of which setting we put it on. The transducer is on the stern behind the rudder. Temperatures are around 80-85 F. and humidity is around 85% if it's not raining.

We've played with the angle of the transducer, we've tried numerous settings. Prior to about an hour of use it's working almost 100%.

One suggestion was that the ground lead is heating which is building up resistance and then I loose the signal. I checked the ground connections on the batteries, the connectors themselves and the cable (as much as I can tell ) they all are clean and tight fittings, no corrosion. The transducer is firing! You don't want to get your hand under it or you can "feel" the firing.

Does anyone here have experience with a Garmin 498 or Garmin period.

Is it a bad unit? or is there something you can suggest I try before I go and find another unit for my boat. I'm thinking of a Lowrance Elite 5 if I can mount it close to the panel out of the way of the sheet.
 
Last edited:
Jan 18, 2011
225
Hunter 26 Beaufort SC
I'm almost sure temperature and humidity has no effect. Think about it being on a console of a power boat exposed to everything.
I'd bet it's the power supply that has an issue (like the ground), a bad or crimped transducer cable, or a bad unit. If the transducer cable is spliced anywhere, check the splices.
 
Apr 10, 2010
159
Hunter 26 Boca Chica, Rep. of Panama
thanks for the feed back. I'm still scouring the internet to see if someone else has this problem. Funny I was talking with a friend today with a power boat that has a Garmin system. I'm not sure which model. He says his has the same problem after about three hours of operation.
 

BrianW

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Jan 7, 2005
843
Hunter 26 Guntersville Lake, (AL)
I'm with drumbeater on suspecting electrical connections. My brother has had a Uniden depth unit on his power boat. He experienced similar problems as you described. He simply disconnected and reconnected his power connections on the terminal and it fixed the problem. After 10 years of use, this was the only problem he's experienced with the Uniden unit. BrianW
 
Apr 10, 2010
159
Hunter 26 Boca Chica, Rep. of Panama
That's worth trying. I just ordered a Lowrance HDS 5. I've got the Garmin still installed and I'd like to take a 300k trip while I await delivery. Since most of the trip is in deep water I think I can handle it without a depth finder, but who knows maybe this will fix it?

thanks
 
Jul 1, 2009
9
2 23.5 Lake Jocassee
I have a Garmin 478 on my Hunter 23.5 and when I first installed the transducer I had problems getting the 478 to acquire the depth sounder. On the depth sounder page the unit did not show up. It was as if it wasn't there. The lights were working on the black box attached to the depth sounder but the GPS just did not see it. I checked the wiring and everything else I could think of before finally calling tech support. They had me do the one thing I had not tried- a hard reset of the 478 which erases all your waypoints and settings. Damned if that didn't fix it! It has worked flawlessly since.
 
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