Humminbird Side Imaging Forums

Side Imaging Forums => 997c SI, 998c SI & 999ci HD SI => Topic started by: mulliemark on September 16, 2013, 04:57:34 PM

Title: poor 997 imageing
Post by: mulliemark on September 16, 2013, 04:57:34 PM: I have 2 used 997's and the imaging is just horrendous at low speeds at any thing below 1 plus mph everything is blurred and it is hard if not impossible to pick out detail. I use them on the bow and have tried them on 2 diff t/d's same results. I can look at my 798 running at the same time and the pic is way way better, any thoughts?

mark
Title: Re: poor 997 imageing
Post by: Humminbird_Greg on September 17, 2013, 02:16:13 PM: What Chart Speed are you using?
Title: Re: poor 997 imageing
Post by: mulliemark on September 17, 2013, 08:54:09 PM: chart speed of 1 and these are the better ones
Title: Re: poor 997 imageing
Post by: LocDown on September 17, 2013, 10:56:43 PM: Is the transducer mounted on the trolling motor? If yes, is the trolling motor pointing forward while scanning?
Title: Re: poor 997 imageing
Post by: mulliemark on September 18, 2013, 09:29:25 AM: yes and yes
Title: Re: poor 997 imageing
Post by: Humminbird_Greg on September 19, 2013, 08:34:30 AM: For a speed of 0.3 and 0.8 mph that may be as good as it gets. I'm not 100% sure on this as it has been a very long time since I have tried any Si imaging at these speeds. I do know that you will have to keep a very straight track and constant speed at these slower speeds to get any sort of clear image.
Title: Re: poor 997 imageing
Post by: mulliemark on September 19, 2013, 09:52:13 AM: when your on the t/m these are the speeds you get. My 798 resolution at these speeds is light yrs ahead of the 997
Title: Re: poor 997 imageing
Post by: rnvinc on September 19, 2013, 01:01:36 PM: You mentioned 2 - 997's....

Are both 997 units using their own xducer...and both have this same problem...??

Have you tried either of the 997's on the 798 xducer...??

Rickie
Title: Re: poor 997 imageing
Post by: LocDown on September 19, 2013, 10:17:09 PM: I tend to get better readings at 2-3mph at chart speed 1 at 455khz. I can't seem to get my 800khz scans to be as clear so I gave up on that freq.
Title: Re: poor 997 imageing
Post by: mulliemark on September 19, 2013, 10:34:45 PM: yes but thats not the speed you scan at on a t/m
Rn I only run a 997 at the bow and my 798 on the console and when I am on the t/m I spin the 798 around to compare images at sub 1mph
Title: Re: poor 997 imageing
Post by: LocDown on September 19, 2013, 11:02:00 PM: I've never been able to get very good scans going that slow. I always end up turning or something messing up the sidecan.
Title: Re: poor 997 imageing
Post by: mulliemark on September 20, 2013, 12:02:36 AM: I am talking about the part when you are traveling in a fairly straight line and the 997 can't pick out detail unless something is very close to being under the boat then it can pick out some fair detail
Title: Re: poor 997 imageing
Post by: LocDown on September 20, 2013, 12:26:05 AM: I wonder if your transducer for the 997 has deteriorated. Can you swap the 798 and 997 and see if the problem is the transducer.
Title: Re: poor 997 imageing
Post by: mulliemark on September 21, 2013, 09:52:05 AM: same result with 2 diff ducers one of which is new
Title: Re: poor 997 imageing
Post by: LocDown on September 30, 2013, 07:26:20 PM: How about leaving the trolling motor in the water with the 997 on and using the outboard to maybe go 2-3mph and see if the scans look any better.
Title: Re: poor 997 imageing
Post by: silentkilla on October 01, 2013, 08:37:12 PM: I've always read that it's best to have SI on the Trans & DI on the TM! Works good that way for me.