Author Topic: High Speed Dual HDSI Advice.. Looking To Upgrade T0 998sc SI (Read 14939 times)

Jw2000uk · « **on:** January 08, 2013, 04:26:06 PM »

Hi, Apologies for asking for help on my first post :-/

I currently have dual XHS 9 HDSI 180 T transom mounted..

I have no pics, But arrows where they are..

I want to sell my 797 si and Raymarine a57.

And buy a solo 998 sc SI

I would love to have a single thru hull and sell the HDSI transoms, But as in pics, cant think of anywhere to mount it ??

The rudder overhangs 3" hence 2 Hdsi transducers...

Here is my question..

Will my unit switch to 2d or anything, to give me normal sonar at high speeds and water upto 300'?

im using the splitter cable for the 2 HDSI's..

Any help will be great..

LocDown · « **Reply #1 on:** January 08, 2013, 09:34:39 PM »

Are you talking about XPTH9HDSI180T plastic thu hull transducer with Side Imaging? or are you talking about a shoot thru (XP920) for high speed 2d? if the latter, you can still add another splitter(AS SIDB Y) that will just use the 2d from the shoot thru and just ignore the 2d from the dual HDSI transducers. ..that's a lot of money on transducers.

Jw2000uk · « **Reply #2 on:** January 09, 2013, 01:42:54 AM »

Was hoping one of the hdsi transom mounts would do 2d at high speed :-(

Adding a 3rd transducer and another splitter cable i just cant justify.

Can you see anywhere, i could put a thru-hull si transducer??

I could ditch the 2 transom hdsi's then.

LocDown · « **Reply #3 on:** January 09, 2013, 01:58:10 AM »

Yes, there are thru hull SI transducers if you want to drill a hole in the bottom of your boat. The Si transducers are real picky about going fast and trying to keep a good reading.

Jw2000uk · « **Reply #4 on:** January 09, 2013, 02:07:51 AM »

Thanks for the reply..

But i cant see where i could put a single thru hull.. Hence the transom mounts in the first place...

The keel,prop,rudder..

All look like they will get in the way??

ITGEEK · « **Reply #5 on:** January 09, 2013, 08:20:52 AM »

That's a very nice boat you have there. It looks
very unique.

What about the bottom of the keel?
Some people put through the hull transducers on the
bottom of the keel, towards the back half of the boat.
If it's in the right place, it may even work when you
are on plane.

I've read where there is far less turbulence there,
compared to the transom area, and the readings/images
can be really good. The only problem is: be extremely
careful about getting into really shallow water, and
don't hit anything with the transducer protruding from
the bottom of your boat.

In your case, with that big unique boat, I'd talk to
a marine installer/mechanic to get the best possible
location.

Transducer placement is probably the single most important
aspect to good side-imaging/sonar readings.

Jw2000uk · « **Reply #6 on:** January 09, 2013, 02:00:24 PM »

Thanks mate.. Im in the UK. And this type if boat is common around here..

Fishing and pleasure ;-)

Id love to get it in the bottom of the keel, but its a solid mould..

So i cant see how i could attach it through the keel :-(

Some more pics i found. Would be perfect at the back. But just looks impossible..

ITGEEK · « **Reply #7 on:** January 09, 2013, 02:19:56 PM »

That is a very unusual looking keel.
It looks like you really can't install anything near
that prop or you will have too much turbulence.

Well, the advantage to having two transom transducers, is
that you can adjust each one individually.

With a through the hull transducer, if the boat naturally lists to one side
(because of equipment/people/weight), you really can't adjust it.

You may be better off with the two transom transducers for side-imaging.

So JW:
Have you tried going high speed with 2-d using these two transducers?
I know some people have installed a shoot through the hull transducer to
get high speed readings. But your hull looks like it's steel. I'm not sure
it would work.

Maybe Greg can give you some ideas.

Humminbird_Greg · « **Reply #8 on:** January 09, 2013, 03:46:22 PM »

No ideas but some questions:
The 797 unit you have now is connected to both the HDSi transducers, right?
How does it work at high boat speeds?

Jw2000uk · « **Reply #9 on:** January 09, 2013, 04:14:03 PM »

Yes both hdsi through a y cable in the unit ;-)

The shoot through hull would be the obvious answer. But im not willing to have a 3rd transducer and another split cable lol :-(

It looses 2d at around 12 knots.

But it didnt bother me, as i had the a57 for fast 2d..

But now i want a single unit, i wish i tested the 2d more, angling the transducer etc..

Isnt there a setting where i can tell it, to act like a normal
Sonar lol.?

P.s. its a fiberglass hull/keel.

Humminbird_Greg · « **Reply #10 on:** January 10, 2013, 08:22:29 AM »

You can set the “Connected Transducer” (called “Transducer Select in older software) to the DualBeam menu setting. The unit will only have the conventional 2D sonar but it won’t work any better. About the only thing you can do, as far as unit settings go, is to set the “Max Depth” menu setting to just a little deeper than the water that you will be in. It can help a little in some situations. Other than that you need to try adjusting the right HDSi transducer (that is where the 2D sonar is coming from) or think again about that AS-Si-DB-Y cable and XP-9-20 transducer.

ITGEEK · « **Reply #11 on:** January 10, 2013, 08:30:00 AM »

JW:
It's neat the way your boat is designed to totally
protect the propeller.

Good luck with your transducer problem.

Jw2000uk · « **Reply #12 on:** January 10, 2013, 04:16:37 PM »

Tough decisions ahead.. Do i just give up on Si And Di..

Once the boats back in the water i could try a thrm settings/angling the right transducer..

I had a look at the 2d XP-9-20 and it didn't seem to say about working on the SI range??

@itgeek that bar is a life saver lol.. My boat came off the mooring, without that bar it would of smashed the rudder and prop etc..

sonar2000 · « **Reply #13 on:** January 10, 2013, 05:42:42 PM »

Dont give up. These HB transducers are very sensitive to influences external to the transducer. Duer in part to the beam size and the packed transduycer with different frequencies.
Mounting the transducer is a try and see placement unless you have an exact duplicate boat who has found the spot that works..
Dont get iin a hurry and you will be pleased in the end.
Chuck

Humminbird_Greg · « **Reply #14 on:** January 11, 2013, 11:27:21 AM »

The XP-9-20 (or XP-9-20-T) transducer is the correct one to use as an inside-the-hull DualBeam transducer for the 998c Si units. It will only provide the 2D sonar readings – not any Si sonar readings. Those will be provided by the two HDSi transducers you have installed now. You will also need the afore mentioned AS-Si-DB-Y cable.

Jw2000uk · « **Reply #15 on:** January 21, 2013, 02:35:02 PM »

Hi Lads.. After much thinking..

I have decided to get the 2d Puck and splitter cable...

So, i take it its my,

dual Hdsi in to AS SILR Y --TO--- One port in the AS SIDB Y And the XP 9 20 in the other? Then into the UNIT?

My hearts set on the 997/998SI..

As im in the UK its hard... Would have one from the states, but unless its marked LOW $ value, Customs will have a field day @ around $500-600 :-(..

My luck did come in, and i bought the 997si for $1100 , £700GBP on sunday.. Only to be refunded monday, Claiming it had become faulty on test.. Thats a bargain price when it was located in the UK :-(

Anyone know any options for my pursuit for the unit..

Humminbird_Greg · « **Reply #16 on:** January 22, 2013, 03:21:48 PM »

That is one way to connect them all up.

sonar2000 · « **Reply #17 on:** January 22, 2013, 08:33:01 PM »

Kinda of a pricey way to do it but if it works........ It would be nice if the unit its self had two transducer inputs. But that may be to much to ask for this late..

Chuck

sjefsrafsern · « **Reply #18 on:** January 23, 2013, 12:04:16 AM »

Hi, there are several ways to do this. both with a xpth and a xhs. and i would only use one ducer under the keel either with a custom steel bracket for the xhs or with a xpth. then you will get nice images and dont need a extra transducer for high speed. but tis ofcorse depends on how mutch work youd like to have with it and ofcorse if youre willing to drill hoes in your boat.

stig

LocDown · « **Reply #19 on:** January 23, 2013, 12:11:01 AM »

It looks like he trailers it. From what I can see, if anything is mounted lower than that prop guard, it would probably get knocked off while getting back on the trailer.

sjefsrafsern · « **Reply #20 on:** January 23, 2013, 05:40:04 AM »

okay, its a different trailer than i first thought. but if there is enough space between the hull and the prop id consider making a new prop guard with an integrated xhs mount. so that it fluctuate with the keel, then i dont think it would be a problem. because when he winch the boat into the trailer it looks like most of the preshure will be in the front of the hull. and maybe he could lower the last keel wheel on the trailer, it looks like its there mostly to guide the boat into the trailer rater than supporting its weght.

Jw2000uk · « **Reply #21 on:** January 28, 2013, 12:53:29 PM »

Thanks for the latest replys..

Ive stuck with the x 2 transom Hdsi's.

I got the 998si PHEW!! from France for a decent price..

And a XTH-9-20 P Plastic Through Hull Transducer for 2d..

Now ive noticed that my Hdsi's seem to have been mounted to low, And prob dragging at high speed...
But if i raise them, Would the beam hit the tabs..

I have drew what i remember to be roughly the waterline...

Also, Will the 998 switch to the 2d transducer automatically?

Humminbird_Greg · « **Reply #22 on:** January 28, 2013, 03:53:30 PM »

Yes, if you raise the HDSi transducer(s) the Si sonar may hit the tabs. Hard to tell though without doing so. I would get the whole deal working first before adjusting them.

Using the Y-cables there is no switching of transducers. The 2D sonar will always be coming from the XTH-9-20-T transducer as that is the only 2D sonar element that will be electrically connected to the unit.

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Author Topic: High Speed Dual HDSI Advice.. Looking To Upgrade T0 998sc SI (Read 14939 times)

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