Author Topic: 798 snapshot question (Read 15958 times)

HookonFishN · « **on:** February 05, 2012, 01:28:50 PM »

These are shot from my 798 mounted on my trolling motor. I'm wanting to know if these shots look like RF interference or just settings on my unit. Just as I was coming off the water I adjusted the chart speed and it may have cleared up I will have to check it my next trip out. I would still like input as to weather or not if anyone see any RF interference in these shots.

stillbear · « **Reply #1 on:** February 06, 2012, 08:08:14 AM »

Yes you have RF at the sonar image.Take your extra cable from your transducer make a loop from end to end of extra cable
then roll the loop up an wire tie.Make sure power source is away from transducer cable.Do some research find out what you can
take apply just a little surface clutter. If you still get interference call HB CS support. Gary

Humminbird_Greg · « **Reply #2 on:** February 06, 2012, 02:41:32 PM »

Usually we see the trolling motor interference showing up in the Si sonar due to its frequency. Like Gary pointed out: your interference is in the 2D sonar. Was there another sonar unit operating at the same time?
In your last image above there was some type of interference showing up in the Si sonar. Was the trolling motor pulled out of the water than?

Did you test your unit with the trolling motor running at each (variable) speed settings?

HookonFishN · « **Reply #3 on:** February 06, 2012, 10:03:25 PM »

@ Greg yes I did have my 998 running at the same time and I did try it at different tm speeds and was getting the same result and that last shot could be when I pulled it out of the water for a few seconds. I think part of my problem is that im trying to get two units straightened out at the same time when I should be concentrating one and then the other may be a little simpler. I also need to go back out and try to get some better shots. @ Stillbear my extra power cable is coiled up and in a zip tie it powered from my fuse panel, I have been told that I could power it from my TM but I thought that may cause some RF also. I don't know if this matter but I should have mentioned I have a aluminum boat(2005 Bass Tracker 175) what can I say poor man's money poor man's ways.

sonar2000 · « **Reply #4 on:** February 07, 2012, 08:36:33 AM »

Hook, the last picture is exactly what one would expect of a transducer out of the water or in very high bubbles (cavitation)
The others are exactly what you would see with electrical noise.
Check grounds and if possible put the unit on its own power supply.
One thing about boats that is different than houses is ground.
On a boat we only have positive and negative.
It would be nice if we coud have a three wire boat electrical system.
But that is what the guys are doing with the extra ground wire...

Chuck

Humminbird_Greg · « **Reply #5 on:** February 07, 2012, 11:45:52 AM »

Quote from: HookonFishN on February 06, 2012, 10:03:25 PM

@ Greg yes I did have my 998 running at the same time and I did try it at different tm speeds and was getting the same result and that last shot could be when I pulled it out of the water for a few seconds. I think part of my problem is that im trying to get two units straightened out at the same time when I should be concentrating one and then the other may be a little simpler. I also need to go back out and try to get some better shots. @ Stillbear my extra power cable is coiled up and in a zip tie it powered from my fuse panel, I have been told that I could power it from my TM but I thought that may cause some RF also. I don't know if this matter but I should have mentioned I have a aluminum boat(2005 Bass Tracker 175) what can I say poor man's money poor man's ways.

When you get those better shots HookonFishN; be sure that your 998 is not running at the same time and see if the vertical lines in the 2D sonar clear up or not. If they do what you can try is turning the 998 back on but turn on and up the Noise Filter menu in your 798 unit to see if that will squelch them out or not.

The best power connection would be to run a new set of wires all the way back to your cranking battery (don’t forget the in-line fuse and holder).

sonar2000 · « **Reply #6 on:** February 07, 2012, 12:34:32 PM »

With the HB units the best electrical connection is to have an isolated power supply. One that is not shared with any other device. And to have good grounds.
I know......... added expense but it will help the interference issues.

Chuck

HookonFishN · « **Reply #7 on:** February 07, 2012, 07:11:34 PM »

Quote from: Humminbird_Greg on February 07, 2012, 11:45:52 AM

When you get those better shots HookonFishN; be sure that your 998 is not running at the same time and see if the vertical lines in the 2D sonar clear up or not. If they do what you can try is turning the 998 back on but turn on and up the Noise Filter menu in your 798 unit to see if that will squelch them out or not.

The best power connection would be to run a new set of wires all the way back to your cranking battery (don’t forget the in-line fuse and holder).

Greg is that what the noise filter is for because mine is set on 1 on both units now before you answer remember I'm a rookie trying to learn how to operate these nice toys? @ Sonar I should get off work early enough tomorrow to change my power supply and ground and what size inline fuse should I use?

sonar2000 · « **Reply #8 on:** February 08, 2012, 08:06:20 AM »

Hook, fuse the positive wire with a 3 amp fuse.
Use a good quality fuse link and best one that is made for high moisture areas (like in a boat).
The inline bayonet fuse will work but does have over time some corrosive action or loss of spring tightness.
Keep the fuse away from floors or walkways..
We usually fuse it right at the battery.
Chuck

Humminbird_Greg · « **Reply #9 on:** February 08, 2012, 10:37:20 AM »

Quote from: Bob B on February 07, 2012, 02:49:24 PM

HMMMM....just what kind of frequency is that Greg......Sorry, just couldn't help myself.

Sorry Bob but it passed the spell checker…
My apologies. I went back and modified the original post.

Humminbird_Greg · « **Reply #10 on:** February 08, 2012, 10:39:24 AM »

Quote from: HookonFishN on February 07, 2012, 07:11:34 PM

Greg is that what the noise filter is for because mine is set on 1 on both units now before you answer remember I'm a rookie trying to learn how to operate these nice toys? @ Sonar I should get off work early enough tomorrow to change my power supply and ground and what size inline fuse should I use?

That is a part of what the Noise Filter menu is for. In fact back a year or more ago when they modified this menu it was strictly for sonar-to-sonar interference like I think you are getting.

sonar2000 · « **Reply #11 on:** February 08, 2012, 12:05:39 PM »

The picture especially the 2d looks more like rf or electrical than sonar pings...
Chuck

HookonFishN · « **Reply #12 on:** February 08, 2012, 05:58:35 PM »

Thanks guys I'm making adjustments for my power supply and ground now and will also check the noise filter on my next outing which it doesn't look like will be before monday with the way my schedule is looking and I will post some shots of my results to you all posted thanks again for all the advice.

HookonFishN · « **Reply #13 on:** February 22, 2012, 09:26:24 AM »

Well guys I took your advice and made some changes, I ran my power supply directly to my cranking battery with a 3amp fuse. On my 798 I didn't adjust the noise filter its still on low and these are the results of my actions take a look and tell me what you think, also if you don't mind take a look in the 998 forum for images I will be posting on it also. I tried to get images at different depths.

HookonFishN · « **Reply #14 on:** February 22, 2012, 09:30:37 AM »

Sorry it took so long with my work schedule and honey do list I'm pretty busy trying to get a lot of things done so it doesn't interfere with my time on the water. Also these shots were taken with both units running at the same time.

sonar2000 · « **Reply #15 on:** February 22, 2012, 07:15:52 PM »

Those are good pictures. I dont think I would change anything...
Chuck

Humminbird_Greg · « **Reply #16 on:** February 24, 2012, 02:28:45 PM »

Doesn’t look like you were getting any sort of interference in these images at this time. I posted my comments about your 998c Si unit on that post.

sonar2000 · « **Reply #17 on:** February 24, 2012, 02:36:29 PM »

the original problem looked to be RF or electrical white noise and not sonar. I think you may have fixed your issue..

Good job..

chuck

HookonFishN · « **Reply #18 on:** February 27, 2012, 03:49:31 PM »

Well I made it to the lake today and have come to the conclusion that my 798 is good to go but im having problems with sonar to sonar on my 998. Try and follow me. These shots were taken from my 798 with the 998 running on the 798 transducer. The first shot is the 798 transitioning from the 798 transducer to the 998 transducer then from the 998 transducer back to the 798 transducer all the while the 998 is operating off the 798 transducer if you follow me therefore i'm drawing the conclusion that the 798 is operating fine. Take a look at the images i'm posting under the 998 forum in which you guys have already been trying to help me solve.

sonar2000 · « **Reply #19 on:** February 27, 2012, 03:56:22 PM »

HF...I believe that looks normal when the (switch) takes place. There is a short period while the units figure out which is going to fire the tranduscer element.
Once the switch takes place and the screen clears do you get the full screen display.?

Chuck

HookonFishN · « **Reply #20 on:** February 27, 2012, 04:41:03 PM »

Quote from: sonar2000 on February 27, 2012, 03:56:22 PM

HF...I believe that looks normal when the (switch) takes place. There is a short period while the units figure out which is going to fire the tranduscer element.
Once the switch takes place and the screen clears do you get the full screen display.?

Chuck

Yes I understand that I just wanted to take shot of it during transition to show the difference when changing transducers I think my 798 is fine its the 998 im having the trouble with.

sonar2000 · « **Reply #21 on:** February 27, 2012, 04:44:22 PM »

HF....OK, I missread your post. Yes it seems you are right on target...
Now to get the 998 fixed...

You have made a lot of progress so far. Keep up the good work....
Chuck

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