Author Topic: 898c SI sonar images not so good. *** PICS ***  (Read 10870 times)

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Offline ckbrown

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898c SI sonar images not so good. *** PICS ***
« on: June 19, 2012, 04:45:35 PM »
Hey guys,

I have got a problem and can not seem to get it straight. I installed a 898c si on my bosses war eagle alum boat. I installed the transom mount where it is supposed to go and the trolling motor unit where it is supposed to go. I went through the forums getting the Si and Di typical settings. My boss says he can not see anything like the sample pictures on Humminbird web site. The images are not clear. He recorded a fishing trip last weekend and got the data file to me. I downloaded Humviewer and looked at the file. I then broke the file up into smaller files for ease of use. But I still could not get a very clear image from any of the files.
 
I am attaching some images captured from HumViewer. Also along the data stream there are what look like tear bars in the video, I uploaded a screen shot from 10 minutes and 30 seconds. I have no clue what they are,. See what you guys think. I also have some 20 minute data files that I can upload if needed. I also have a couple of photos taken during a similar installation. I have attached them. The transom transducer is a XHS-9-HDSI-180T and the trolling motor trnsducer is a XTM-9-HDSI-180-T. I am using a TS3 W selector switch to select between the bow and the stern. The boat is a alumaweld. The bottom of the tramsducer is 1/8" above the bottom of the hull and in level by bubble.
 
And what are those ripples in the SI view?
 
Thanks
ckbrown


Sorry, forgot to add pics of boat. Now Fixed.
« Last Edit: June 21, 2012, 07:01:05 PM by ckbrown »


Offline sonar2000

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #1 on: June 19, 2012, 05:22:10 PM »
Most screens are not as good as a marketing promo.
 Now having said that it looks as if you are drifting and not running any type of motor propulsion. The speed of 0.0 will not provide a good image. You should be at least 1.5 mph to get a good definition of ping and return. Sitting still or very slow drifting will not produce a good result.
Try getting the boat to move a bit faster..

Chuck

Offline Weekend Warrior

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #2 on: June 19, 2012, 05:27:31 PM »
He is not moving. He's sitting still or adrift and barely moving. The boat has to be moving(at least a little bit)in order to get decent images.  Look at the speedo. 0.0 mph.

Mark

Offline ckbrown

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #3 on: June 19, 2012, 05:39:29 PM »
Thanks for replying,

I understand that the minimum speed for the SI unit to work correctly is 1.5 MPH. OK, no problem.

So how do the photos of the installation look? I mounted it like the instructions say.

He has a issue with the ducer throwing a rooster tail up but I found that there should be a piece of black rubber or plastic to snap into the ducer. Do I have that right?

Does anyone have a good working set of settings for the HumViewer to work with the .dat files?
« Last Edit: June 19, 2012, 06:00:04 PM by ckbrown »

Offline Roddy

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #4 on: June 19, 2012, 07:02:51 PM »
Gotta go with Chuck and Mark on this one, if the boat is not forward moving the screen is overwhelmed with returns in the same spot.
« Last Edit: June 19, 2012, 07:04:46 PM by Roddy »
Scan,Scan and Rescan Roddy

Offline sonar2000

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #5 on: June 19, 2012, 08:10:09 PM »
CKB...the minimum speed is not a definate speed, but 1.5 should be a great place to start. I would not go over over 5mph either.
You may find your sweet speed by playing around but this should get you started..

Lets get some pictures with the boat moving and we can tell better about the mounting position.

Chuck

Offline LocDown

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #6 on: June 19, 2012, 09:18:24 PM »
Do you have a picture of the install from behind the boat? So far it looks to be good.

Offline newkid4si

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #7 on: June 20, 2012, 12:51:25 AM »
Looking at the 2D images-- try less sensitivity. It appears to me that it is to high for that shallow of water.

             Mike

Offline xSilmarilSx

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #8 on: June 20, 2012, 02:37:44 AM »
Remember everyone, that when you review your data using HumViewer, the unit settings like Switchfire and sensitivity are irrelevant. The unit record the RAW data before post-processing.

And it's why you normally see more valuable data on the computer.

Offline ITGEEK

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #9 on: June 20, 2012, 09:41:26 AM »
The transducer installation looks good, but with the motor resting on the transom saver,
we have no way of knowing if the motor is blocking anything to the left under normal
motor tilt.

Also,
Don't know for sure, but there may be some inteference issues going on.

As everyone has said before, try recording again, with at least 1.5mph speed.
Then you can re-assess.

Offline ckbrown

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #10 on: June 20, 2012, 10:20:29 AM »
Thanks for the replys guys. Good information.
Yes Locdown I will correct the missing picture of the rear view of installation.
Yes Itgeeki I will tilt the motor down and take another phot of the cross view of the ducer.
T=Yes xSilmarilSx in Humviewer you are usung raw data. That is why I was asking if anyone has a good set of contrast and brightness settings for the DI, SI and 2D displays. My DI is very muddy in Blue using Br of 1.05 and cont of 1.75 The SI is not so bad in blue using Br of 1.25 and cont of 1.50. The 2D is 2D default using Br of 1.00 and cont of 1.00.

Thanks in advance for the help.
ckbrown

Offline basszilla

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #11 on: June 21, 2012, 01:01:38 AM »
Try turning off one unit.  It looks like interference from another unit. 

Offline ckbrown

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #12 on: June 21, 2012, 03:53:59 PM »
basszilla,

That is what I thought as well until I checked with HB. He has only the 898c Si in the boat. No other active electronics except for trolling motor or main motor. The wiring for the ducers and the unit are run in a wiring trough in the starboard side of the hull. The power is fed to the unit by a dedicated power run from the troling motor battery. There isa fuse in the feed wire. The boat has a transom XHS-9-HDSI-180T ducer and a XTM-8-HDSI-180-T ducer mounted on the trolling motor. There is a TS3-W transfer switch for selecting the bow or stern ducer. So I called HB and asked if the bow and stern ducers were transmitting at the same time but only the signal from the selected ducer be displayed. I was informed that the case was that the select switch connected only one ducer to the 898c at a time. So that was not the problem.
Thanks for the help.
ckbrown

Offline ITGEEK

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Re: 898c SI sonar images not so good. *** PICS ***
« Reply #13 on: June 22, 2012, 01:56:53 PM »
Quote
The power is fed to the unit by a dedicated power run from the trolling motor battery.

The fact that the sonar is sharing the same battery as the trolling motor may
cause you interference.  It's best to have the sonar on a battery that ONLY
the sonar, and nothing else BUT THE SONAR is hooked to.

If having a dedicated battery for the sonar is not possible, then search this site
for 'Trolling motor interference'.  If there is interference, there are ways to
help or eliminate it.

The easiest way to check this is to turn everything on the boat off except the sonar.
Look at the screen.
Then, turn on the trolling motor, and see if you get lines and/or snow on the screen.
Also, see if your depth reading is jumping.
Any of these symptoms (while the trolling motor is on), shows you have
trolling motor interference.

Good Luck.


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