Author Topic: 455 KHz  (Read 14774 times)

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Offline Speedtroller

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455 KHz
« on: June 20, 2012, 04:09:49 PM »
I have a 798ci si unit. I was told that side and down imageing works best at 455 KHz. Is this true. The Xducer  I have is 200/83.  200  83KHz. I know Humminbird sells another xducer that has 455 200 83 will it make any difference in the quality of the picture or make the unit perform any better. Or will a quadrabeam xducer be any better than what came with the unit.
Fishing, a jerk on one end, waiting for a jerk on the other end !!!


Offline Humminbird_Greg

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Re: 455 KHz
« Reply #1 on: June 20, 2012, 04:31:32 PM »
The 800kHz Si/Di sonar will give a finer detailed image but that is not an option for the 798ci Si unit as it does not use this frequency.  The 455kHz is better for deeper/farther Si/Di sonar readings and it covers a wider area of the water column.  This is what most use even on the units that are capable of the 800kHz Si/Di frequency.

The transducer that should have come with your 798ci Si unit should have been the XNT-9-Si-180-T Compact Side Imaging (CSi) transducer.  It is capable of the 455kHz Si sonar as well as the 200kHz and 83kHz 2D sonar.

You could use an XHS-9-HDSi-180-T “HDSi” transducer which is longer and will allow a finer detail to the 455kHz Si/Di sonar, but you may not be able to see the difference that it makes on the smaller display of your 798ci Si unit.

The QuadraBeam transducer will cover a smaller area of the water column.

Greg Walters at Humminbird
gwalters@johnsonoutdoors.com

Offline Speedtroller

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Re: 455 KHz
« Reply #2 on: June 20, 2012, 05:10:11 PM »
Greg I checked and my unit came with the xnt 9   SI  180 t. My xducer select is set to compact sides can but my beam select does not give me a option for 455 KHz on 200/83 200 83 . Am I doing something wrong or is there something else going on
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Offline wolfs4evr

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Re: 455 KHz
« Reply #3 on: June 20, 2012, 06:51:20 PM »
There is no option.  DI/SI on a 798 is 455mhz only.  No matter what transducer you have.  Unit limitation.  898/998/1198 use a HDSI transducer and are capable software/hardware wise to use either 455 or 800.

Offline Speedtroller

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Re: 455 KHz
« Reply #4 on: June 20, 2012, 07:05:54 PM »
Wolfs4evr, thanks for the info. This really sucks. For what I paid for this unit I am not happy with it at all. I love HB and will not buy anything else. But I feel deceived by them on the capabilities of this unit. If I could do it again I would have waited a few more months and saved the money for the 898/998 or 1198. Or just got one of the 2d DI units.
Fishing, a jerk on one end, waiting for a jerk on the other end !!!

Offline reddog

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Re: 455 KHz
« Reply #5 on: June 20, 2012, 08:56:08 PM »
Theres no deception involved on Humminbirds part. The 798 has always been 455 only for SI/Di..  I'm mnot sure why you think you want 800 available to you, but, like Greg mentioned, 95% of the users with 800 khz available to them, dont use it. Its finicky, and not nearly as easy to use as 455... and I have experimented extensively with 800..

Are you sure your 455 compact is working properly.  The only time I have ever seen anyone unhappy with a 798, was when it came to screen size, not image quality..

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Offline Speedtroller

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Re: 455 KHz
« Reply #6 on: June 20, 2012, 10:22:41 PM »
No I'm not sure it is working properly.  I can troll right next to a field of standing timber hundreds of yards long and not see anything but a few dots and a few shadows. I have spent hours changing settings and adjusting the sensitivity and have never seen a image on my screen that looks anything like the ones I see people post .or be be in front of a fallen tree . I can't see all the branches highlighted . I've trolled by it a thousand times. And seen it when the water was low.  I can see logs laying on the bottom and other structure but nothing when it comes to standing timber or brush piles.any help would be appreciated
Fishing, a jerk on one end, waiting for a jerk on the other end !!!

Offline Speedtroller

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Re: 455 KHz
« Reply #7 on: June 20, 2012, 10:31:29 PM »
Reddog I never said I wanted 800 KHz. Go back and read it. I wanted to know if 455 was better. Cause I was not finding anything on my unit that gave me a choice for 455 just the 200/83 200 83 . But now I learned it doesn't give you a option DI and SI work on the 455 by themselves. The deception I think is either the unit doesn't work correctly or it is not capable of showing a truely highlighted image of a fallen tree or standing timber. Like you see on the box or in the simulator mode.
Fishing, a jerk on one end, waiting for a jerk on the other end !!!

Offline Speedtroller

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Re: 455 KHz
« Reply #8 on: June 20, 2012, 10:52:28 PM »
Here is another thing I can troll by a bridge pylon. 3 ft thick and 15 ft long . Have my chart speed at 3 and speed at 3 mph . It shows on the screen as a dot and a shadow behind it. I have adjusted the sensitivity in SI enhance and the contrast to every imaginable setting all it does is make the image brighter or darker.while doing this I have tried all different things side range, depth range, chart speed changes, split screnes you name it. Still just a dot with a shadow. Is that what it should be. This is why I am on here. To try to get answers and see if I need to send it to HB. I just don't want to be out of a sonar for a few months after the amount of money I spent.
Fishing, a jerk on one end, waiting for a jerk on the other end !!!

Offline reddog

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Re: 455 KHz
« Reply #9 on: June 20, 2012, 11:32:05 PM »
Sorry, I guess you didnt  ask about the 800 :-[

Without  screen captures to look at, its hard to say what exactly is wrong, but I would guess it is a defective transducer.. and yes, 455 is better..  I dont have a 798, so I cannot help you with any particulars, especially regarding the menu differences between the 798 and my 9 and 11 series..

As long as you have the compact side scan selected, you should be getting good returns as long as everything is working properly, and the left and right is clear for the transducer to shoot to the sides..

Can you post pictures of the transducer?  and some screencapture from a SI  screen?

What range are you running your SI at?








Hate to see her go, but love to watch her leave.

Offline Rough House

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Re: 455 KHz
« Reply #10 on: June 20, 2012, 11:36:33 PM »
yes like reddog said. please take a couple of pics of you transducer from a couple different angles for us to check out.  I myself just got done fixing my problems on my 1198 with the help of guys on here.  Also show us a couple of screen shots of the timbers and bridge your talking about. 
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Offline Speedtroller

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Re: 455 KHz
« Reply #11 on: June 21, 2012, 04:54:56 PM »
here are a few pics of the transducer i sont have any screen shots. i just got a couple sd cards today. one for updates and one to save my way points and so on. i will take a few shots next time i go out. thanks very much for the input.
Fishing, a jerk on one end, waiting for a jerk on the other end !!!

Offline Speedtroller

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Re: 455 KHz
« Reply #12 on: June 21, 2012, 04:59:37 PM »
i guess i should also add that i did a update on the unit today and it said it successfully updated on the unit. i went to humminbirds site for the latest updates. it is version 6.350 is there other updates that need to be installed before that one. my unit was made oct 13 2001
Fishing, a jerk on one end, waiting for a jerk on the other end !!!

Offline sonar2000

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Re: 455 KHz
« Reply #13 on: June 21, 2012, 06:45:47 PM »
Is this update for the international model.  798cXi si??????
If you can send it to me I will add it to the forum downloads..

Chuck

Offline Speedtroller

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Re: 455 KHz
« Reply #14 on: June 21, 2012, 09:33:28 PM »
No just the 798c SI   It said nothing about the cxi. Check HB web site it will give you the updates for whatever unit want
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Offline reddog

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Re: 455 KHz
« Reply #15 on: June 21, 2012, 11:44:39 PM »
Transducer looks good from here.. ;)  How about posting a screencapture?  Youll need a SD card in the card slot and you will also need to  turn on the screencapture menu..
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Offline sonar2000

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Re: 455 KHz
« Reply #16 on: June 22, 2012, 08:16:46 AM »
speed, you have to register each unit with HB to get updates. I do not have any international units so do not see the updates for that.
Reference another thread I was sent a file suppossedly for the cXi unit 4486e139e5e849d4bdbd36a0bec8e9b0.bin. at release 6.350...  now I am not sure what is what.

Chuck
« Last Edit: June 22, 2012, 10:10:17 AM by sonar2000 »

Offline ClemsonBloz

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Re: 455 KHz
« Reply #17 on: July 03, 2012, 08:23:19 PM »
Here is another thing I can troll by a bridge pylon. 3 ft thick and 15 ft long . Have my chart speed at 3 and speed at 3 mph . It shows on the screen as a dot and a shadow behind it. I have adjusted the sensitivity in SI enhance and the contrast to every imaginable setting all it does is make the image brighter or darker.while doing this I have tried all different things side range, depth range, chart speed changes, split screnes you name it. Still just a dot with a shadow. Is that what it should be. This is why I am on here. To try to get answers and see if I need to send it to HB. I just don't want to be out of a sonar for a few months after the amount of money I spent.


Bridge pilings will only show up as the dot's with shadows... 

Standing timber will show up as the same,,, dot and shadow.. It would have to be a very large tree to show definition of limbs etc...

Your unit is working normally,, because those are the same things I see when I scan known areas(timber, docks, bridges)..

I don't think the 800 vs 455 is the issue.. We're using small units that are not as powerful as most of the units that produce the screen shots for advertisment.. They have more colors, more pixels, and more watts.. Those are things that distance the 1198 from the 798 IMHO..

Offline Roddy

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Re: 455 KHz
« Reply #18 on: July 04, 2012, 12:36:29 AM »
800 v 455, 800 will give much better detail.

Roddy
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Offline Humminbird_Greg

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Re: 455 KHz
« Reply #19 on: July 04, 2012, 09:04:20 AM »
Three things will help trees, bridge pilings and other objects show larger on the display:
1. Decrease the Si Range
2. Slow the boat down
3. Speed up the display (Chart Speed)
Greg Walters at Humminbird
gwalters@johnsonoutdoors.com

Offline Roddy

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Re: 455 KHz
« Reply #20 on: July 04, 2012, 11:33:13 AM »
Dito Greg!!     Roddy
Scan,Scan and Rescan Roddy

Offline LocDown

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Re: 455 KHz
« Reply #21 on: July 04, 2012, 03:26:55 PM »
Just think of this new technology like as if it were your very first VCR ....it'll take some time to get the hang of it.  I can finally get some good screens after a year and a half. (VCR didn't take that long)

Offline Roddy

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Re: 455 KHz
« Reply #22 on: July 04, 2012, 04:57:14 PM »
I have my 7 year old grandson program the VCR/dvd, so much EZ'er!

Roddy
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Offline rdstair

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Re: 455 KHz
« Reply #23 on: July 07, 2012, 03:57:39 PM »
How do you know what type of transducer you have for sure?

Offline LocDown

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Re: 455 KHz
« Reply #24 on: July 07, 2012, 04:00:43 PM »
There should be a yellow tag on the cable with the part number on it.

Offline rdstair

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Re: 455 KHz
« Reply #25 on: July 07, 2012, 04:04:10 PM »
I would assume that is at the head unit end and not the transducer. My boat is at the dealer right now.

Offline rnvinc

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Re: 455 KHz
« Reply #26 on: July 07, 2012, 05:09:33 PM »
How do you know what type of transducer you have for sure?

It's printed on the xducer cable about a foot up from the xducer itself...

Rickie

Offline Speedtroller

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Re: 455 KHz
« Reply #27 on: July 09, 2012, 02:51:49 PM »
Thanks for all the good info. I will be getting out some time this week and will take a few snap shots to post. As far as a tree having to be very large. If I am in 25 fow and standing timber is sticking out of the water should that show up as more than a dot with a shadow. I think those are some pretty large trees. Wouldn't you.
Fishing, a jerk on one end, waiting for a jerk on the other end !!!

Offline Humminbird_Greg

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Re: 455 KHz
« Reply #28 on: July 11, 2012, 12:38:01 PM »
The tree may be tall but the limbs may not necessarily be that thick which really determines the amount of sonar that will get reflected back to the transducer (larger objects typically reflect more sonar).  Use as small of an Si Range setting as you can, slow the boat down and set the Chart Speed faster. 

Greg Walters at Humminbird
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