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Transducer help, Si-Tex CVS 106

Old 10-04-2011, 07:29 PM
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Default Transducer help, Si-Tex CVS 106

Hello all.

I've got an old (color) Si-Tex CVS 106, CRT monitor, depth/fish monitor. The previous owner slopped bottom paint all over the transducer, and the speed wheel is broken off, so I'm wanting to replace it, rather than try cleaning it.

I'm confused about which one to get. It is a 120khz unit, so says the sticker on the back, and the transducer cable. On the back, where it says "TD" (I assume transducer?) it uses the "TRI" 8-pin port, rather than the "STD" 3-pin.
There is an option in the units menu to switch from (I think) 50hz, 125hz, and 200hz.

Can someone explain to me what transducer I need, and how the 3 frequencies relate? I found this statement in another forum:

" I was given a number to Sitex and called their customer support. For a 120kHz machine, you can buy a switch box, part # SB100, for $90.00. This switches your beam from narrow (std-15 degrees) to wide (40 degrees) and just plugs in line with your transducer cable. It is not a dual freq, just a dual beam and you can only see one beam at a time. Good for looking for bottom locations on wide beam then switch to narrow to put yourself right on top. I really like the sound of it. The number to Sitex is (727) 576 5995 if you need any tech support or sales (you can order the part from them if your local rep doesn't have one). I hope this is information someone other than me wanted to know..... "

Would that require two transducers, or one with dual beam? Looking at the below link, what would be the difference between 236/120ST, and 236/120STDB? Mine should be either one of those, as it is plastic housing and transom mounted.

http://www.wmjmarine.com/marine-elec...cessories.html

Thanks for any input. I'll gladly buy one from a board vendor if possible.
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Old 10-04-2011, 09:49 PM
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That unit is a dual freq sounder. (CVS 106 Mark II)
You can use a single freq or split the screen and use both 50& 200 kHz.
The P66-8 transducer is for that unit and then you will have both 50 & 200 kHz.
I stock the P66-8.

Last edited by semperfifishing; 10-06-2011 at 07:38 AM.
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Old 10-05-2011, 04:41 AM
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Originally Posted by semperfifishing View Post
That unit is a dual freq sounder. (CVS 106 Mark II)
You can use a single freq or split the screen and use both 50& 200 kHz.
The P66-8s transducer is for that unit and then you will have both 50 & 200 kHz.
I stock the P66-8s.


Here is some info on the unit in case your interested in learning more about it:

"The Si-Tex CVS-106 is a very versatile compact video sounder. Power output of 300 watts RMS. The CVS-106 features a brilliant eight color display on a high resolution extra bright six inch CRT. It offers eight ranges to 1,280 feet with automatic range control. At the touch of a key, Instant Zoom fills the screen with an expanded view of the echo. Digital readouts of depth, speed, temperature, and nav displays are in large easy to read numbers. Position data can be displayed with proper NMEA 0183 interface. The CVS-106 is available as a dual frequency 50/200 kHz sounder with many transducer options. You can view a full screen single frequency or a split screen of both frequencies. Other features include event marker for depth, temp and position, shallow and deep water alarms, and 5 speed sweep levels plus freeze."
Mine is not the MKII, but it seems they use the same transducers. I do think that mine would require the part #SB100 to utilize the dual beam.
Can this be verified, and do you sell it also? Got a link or any pics of what the transducer looks like?
Mine looks like this one: http://www.ebay.com/itm/SITEX-250-50...item35b51a9978
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Old 10-05-2011, 05:47 AM
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I have the analog version of your Fishfinder. Its a Sitex CVS 208. It had the same transponder that you reference in your post. To put it bluntly its a piece of crap.

I bought a Airmar TM 260 to use with my Sitex unit and it a night and day difference.

Semperfifishing will not steer you wrong. You may want to PM him regarding the type of fishing that you do and he will help you out.
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Old 10-05-2011, 08:29 AM
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Originally Posted by TECH9405 View Post
Mine is not the MKII, but it seems they use the same transducers. I do think that mine would require the part #SB100 to utilize the dual beam.
Can this be verified, and do you sell it also? Got a link or any pics of what the transducer looks like?
Mine looks like this one: http://www.ebay.com/itm/SITEX-250-50...item35b51a9978

Yes, just use the 250/50/200 ST transducer shown above will work with your unit.
A better transducer is also available.. the P66-8.
(The P66-8 has a Fuji connector....the newer Si-tex units will use the P66-8S, a different connector.)

But you have to send the unit to the factory to have the freq. setting changed to do so.

Last edited by semperfifishing; 10-06-2011 at 07:41 AM.
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Old 10-05-2011, 12:52 PM
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Originally Posted by semperfifishing View Post
Yes, just use the 250/50/200 ST transducer shown above will work with your unit.
A better transducer is also available.. the P66-8.
(The P66-8 has a Fuji connector....the newer Si-tex units will use the P66-8S, a different connector.)
Does the unit being a 120khz unit have anything to do with the two frequencies of the transducer?

Semper, I'll send you a PM shortly.

Thanks for all help guys.
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Old 10-05-2011, 05:50 PM
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I'm pretty sure the 120/235khz uses a radarsonics transducer. It does not transmit 50/200
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Old 10-05-2011, 06:09 PM
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I just purchased one from Jim @ BOE last week . It was for a friend of mine we hit a log and it sheered off the transducer and we were taking on a littke water .
The transducer I ordered was the radarsonic GCO-201R-200-DT8. It is a 8 pin connection and it was a bronze 50/200 MHZ. His unit was the Sitex CVS 106L mkll.
Good luck
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Old 10-05-2011, 06:13 PM
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Originally Posted by TECH9405 View Post
Does the unit being a 120khz unit have anything to do with the two frequencies of the transducer?

Semper, I'll send you a PM shortly.

Thanks for all help guys.
Your unit can use either 50, 120 or 200 kHz...but only by having it changed at the factory.

In case you do not have a manual:
http://www.si-tex.com/CVS106Manual.pdf

Last edited by semperfifishing; 10-06-2011 at 07:42 AM.
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Old 10-05-2011, 06:44 PM
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If your sitex is a 120 khz then thats the transducer you must have for it to operate.
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Old 10-05-2011, 08:45 PM
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Originally Posted by semperfifishing View Post
Your unit can use either 50, 120 or 200 kHz.

In case you do not have a manual:
http://www.si-tex.com/CVS106Manual.pdf
Thank you very much. I did not have a manual. I'll try to give you a call tomorrow sometime.

Why would there be a sticker on the unit? Is that the requirement, or just what it was outfitted with, transducer-wise? I played with it a little, not knowing how it works much, but I see no split-screen capability.
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Old 10-06-2011, 07:36 AM
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Originally Posted by TECH9405 View Post
Thank you very much. I did not have a manual. I'll try to give you a call tomorrow sometime.

Why would there be a sticker on the unit? Is that the requirement, or just what it was outfitted with, transducer-wise?
Because you have the older CVS 160 and not the Mark II you unit is very limited to its transducer selection and use..I originally thought you had the Mark II.
Your unit has the capability to use 50, 120 or 200 kHz but you have to send it back to Si-tex to have it changed.

Your sticker simply means you have it factory set to 120 kHz...not the best freq to work with overall.

Last edited by semperfifishing; 10-06-2011 at 07:46 AM.
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Old 10-06-2011, 08:16 AM
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Originally Posted by semperfifishing View Post
Because you have the older CVS 160 and not the Mark II you unit is very limited to its transducer selection and use..I originally thought you had the Mark II.
Your unit has the capability to use 50, 120 or 200 kHz but you have to send it back to Si-tex to have it changed.

Your sticker simply means you have it factory set to 120 kHz...not the best freq to work with overall.

Ok. I think I may start looking at a newer unit. I'll browse around the forum a bit. Are you a retailer of this equipment? Website?

Thanks.
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Old 10-06-2011, 08:39 AM
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Originally Posted by TECH9405 View Post
Ok. I think I may start looking at a newer unit. I'll browse around the forum a bit. Are you a retailer of this equipment?

Thanks.
Yes.

Here's the new Si-tex SVS650...

http://www.thehulltruth.com/fishing-...50-rebate.html

http://boatinglocal.com/reviews/si-t...e-sounder.html

http://www.thehulltruth.com/marine-e...thing-say.html
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