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hitthebricks

Sonar question

11 posts in this topic

When I motor in to a area and check out the sonar I'll see fish and figure it looks like a good place, shut the motor off, troll around with the electric, but I don't read to much anymore on the sonar, get ready to leave, fire up the motor again and start to leave and there is fish everywhere again. WHY?

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sounds like your transducer is too close to the motor. bubbles and such is distoring the response.

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Where is the sounder getting it power from and what else on that battery? If you have a volt meter on your sounder see how many volts you have when running and compare that to when the problem shows up. Could be that you getting a voltage drop from a weak battery after the main engine is shut down or the trolling motor is turned on. That voltage drop if significant, is like turning your gain down.

Where is the transducer mounted?

If the ducer is mounted to close to the motor or on the left side of the boat(prop rotation)it can throw turbulence at the ducer.

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Well guys, The transducer is mounted on the right hand side and about as far away as you can get. The readings I do get when the moter is running are not the interference type but archs relating to structure or baitfist or depth changes. I think you described it well with "its like turning down the gain". I have a new starting battery and thats what powers everything but the trolling motor. I'll have to check the connections for a voltage drop or poor contact. Thanks HTB

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I checked the voltage with a multimeter and I have 12.5 volts with the motor off or running. Would it appear like that because I'm moving slower with the electric 1/2-1 mph vs. 3+ mph with the 200? HTB

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Hit

What is it do you not read anymore? Fish as in arcs? Do you loose bottom? If your over weeds, does it still show these? And what kind of sonar is this?

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OK, I pull into area and see fish relating to breaks or active around schools of baitfish, start up the trolling motor and never see that again on the sonar. I talked to a buddy tonight and his claim was "the fish are active and disperse as you go over them" so they don't display on sonar. Buy the way, does a tm scare or disrupt active fish? I'm using a Lowrance 480LMS but all I read is bottom, but no fish type arcs when hunting for fish and using the tm for power HTB

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For me its the opposite. I think my outboard scares the fish away especially in shallower water. I always mark more fish with my elec. trolling motor. You could try drifting for awhile where you think there should be fish and see what happens. If you mark fish drifting then I would wonder about the TM.

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Arcs usually turn into straight lines when you are not moving or moving very slowly with a trolling motor from my observations... You still should be able to see that.. As long as you graph still shows good definition of the bottom and still shows other structure like weeds, rocks, etc I would believe your graph is fine..

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Jim is right most of the time you see archs when you are slowly moving and will see longer horizonal marks when you are not moving or moving very slowly, this is because the fish stays under the cone angle longer which results in a longer mark. if a fish camps out right below your tranducer you will get a continuous horizonal mark until the fish leaves the cone angle.

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Sounds like a good answer, I'll have to ceck it out when I get out next time. Thanks for the replys HTB

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  • Posts

    • jigginjim
      I have put my guide clients on lots of pike this summer. So far largest bass is 21"- 5lbs  Pike 36" Approx. 8-9lbs, Walleye is 23 inches 3lbs. The walleyes will get better as the water cools. Time to start jigging, everything you got. I'm even started using my crankbaits.
    • bassbouncer
      I'm a local and yes we boycott the place. Friends have been told that they aren't wanted there that they only want the tourist business. Wife and I boat to Wolf Bay when we go out. We live 2 miles from the landing and wish it was still run by Jack.
    • RoosterMan
      Well I made a decision to put the trolling rods away and go do some jigging.   It seemed to be a good one.  I concentrated on rocky transition areas.  I had three slot fish in an hour.  Went back in for some VC pizza and picked my kids up and went back out for a evening trolling run and that produced as well.  You have to love this lake.  
    • CigarGuy
      We have friends up and they wanted to take us out for dinner, via the boat.  With the wind, the only place was the landing, I tried vetoing It, but lost out.  Had $12.00 burger and fries.  Very good and the service was fast-only 8 others in the dinning area and a few at the bar.  I checked the prices on the wings-$16.00 for 1-1/2lbs.  Del, they had a pretty good burger menu.  I asked about the 20% off deal and the waiter blew me off and said he didn't know anything about it.  I asked who I should talk to, he said the manager or the owner.  We paid the bill and left without asking.  I liked it a few winters ago when they had ,25 wings and 2.00 beers.
    • knoppers
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