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Lowrance 7x Elite Chirp Screen Clarity

Old 10-05-2014, 04:56 PM
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Default Lowrance 7x Elite Chirp Screen Clarity

Hey guys. Have a Lowrance elite 7x chirp with the transom mount hdi skimmer. The screen is clear when trolling in low or high chirp, but when trolling in 200khz or 50khz the screen is picking up a lot of interference (pic attached). Anyway someone could let me know how to dial in this FF? Fishing 60-100ft, trolling 2.6knots. Also lose bottom with any speed over 4knots. Don't have any photos of the transducer, which I know would help with suggestions. The screen shouldn't look like that, right? Sorry about the sidewards picture
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Old 10-05-2014, 05:02 PM
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Do you run any other sounder simultaneously?
Old 10-05-2014, 05:23 PM
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I do have a through hull depth transducer that runs constantly to the middle depth display (in the attached picture), but no other sounders. Only happens in 200/500, not in chirp frequency, and no boats around me to pick up interference. Thanks for the advice abbor
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Old 10-05-2014, 07:29 PM
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Those streaks on the Elite 7, are almost certainly from another transducer, which makes sense since you're running a depth sounder which most likely is running a traditional 50/200 kHz transducer. Try turning that sounder off and watch I bet the Elite's vertical lines dissappear.
As for losing the picture above 4kts, that's just an easy fix, the transducer isn't mounted correctly, if it doesn't have any obstructions in front of it, it may just need to be slightly lowered but without pictures is hard to give you a definitive suggestion
Old 10-05-2014, 07:42 PM
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Rotated..easier to see..

There has been rumor that fish have developed a sonar jamming device....I guess this proves it.
Boy..those sneaky fish!

Last edited by semperfifishing; 10-05-2014 at 07:54 PM.
Old 10-05-2014, 08:20 PM
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Thanks Mahi, I'll give both suggestions a try. Thanks Gil, you'd be happy that's outside of
Half moon bay salmon fishing. Got two yesterday!
Old 10-05-2014, 09:28 PM
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Originally Posted by TUNAHUNTER197 View Post
Thanks Mahi, I'll give both suggestions a try. Thanks Gil, you'd be happy that's outside of
Half moon bay salmon fishing. Got two yesterday!
Good for you!0
Old 10-06-2014, 03:10 AM
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I'm quite sure it's interference as well, but it's strange you don't see it in CHIRP mode. In my experience CHIRP is more sensitive to such interference. Your depth gauge is transmitting at 200kHz with a low output power, but for 200kHz if the frequency deviation between the two sounders are very small you can then get such interference which is not shown in CHIRP mode. The reason why it's showing up on 50kHz is probably because 200kHz is a multiple of 50kHz.

Furuno and Airmar depth gauges use 235kHz to avoid this problem.
Old 10-06-2014, 04:47 AM
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Perhaps he is getting interference in CHIRP, but it would be much less because the 200kHz is a small bit of the CHIRP signal.
Old 10-06-2014, 05:25 AM
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I think it's the repetition frequency which is creating most problems for CHIRP, not the main frequency. CHIRP is sensitive for interference also outside it's frequency band. High transmit power of course make the ping frequency more problematic for CHIRP.

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