Guests - If You want access to member only forums on FM. You will gain access only when you Sign-in or Sign-Up on Fishing Minnesota.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
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?

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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?

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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..

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • certified jumbo
      Bugs have been brutal all summer up their.   Glad you had fun!!!
    • JBMasterAngler
      Well, we went back up there to make up for last month. There was no making up anything! Bugs were horrendous, and the fishing was slow to nonexistent. The biggest point of going back up was to fish West Bearskin and Two Island lakes, and we didn't make it to either this time around either.    We still had lots of fun. Did a lot of hiking and sightseeing, particularly on the way up and he way home. Seen a lot of things I've never seen before. Was nice to sit out by the harbor and eat Sven & Ole's. Definitely a lot more people up there in July, as opposed to June. Well, we'll be back in October. 
    • monstermoose78
      Yeah I like decoys this thread used have some on here. I will try to hit a show Thank you
    • delcecchi
      BTW the "no fish on my spots" was just a riff on Tom''s "no fish under my dock".  Sorry for any confusion.  I'm not much of a musky fisherman, so wouldn't know if there are or not, really.
    • delcecchi
      It spit her out after the first bite..
    • Cliff Wagenbach
      Have heard of people getting bit before but that was a really nasty looking wound!! And some claim that Muskies do not like to eat walleyes! People must taste better! Cliff
    • DLD24
      My last trip to Mille Lacs I lost a big eye right before I saw it with the jiggin rap...Then 10 minutes later I hooked a 28.5" eye and that was the most scared I've been fighting a fish lol... Every head shake I was darn near dropping my rod tip in the water lol.
    • monstermoose78
      What kind of hand auger and shape is it in
    • LBerquist
      Heard island lake was a hot spot. Any lure that resembles a small foot should work well.
    • going4it
      I'd go with 112 if you have the room more power and I believe last longer on the water. I pilot is worth it. Spot lock to fan cast an area or to stay outside the dock that you just got broke off of are two benifits. I pilot link links up with your hummingbird unit if that's what you have for a depth finder. Let's you follow depth contours. Good luck with the purchases