Topic: Adding a dedicated DI transducer?

[Rotus623]

Hey guys, I am trying to get some crisper DI images, and have heard of some people adding a dedicated DI ducer. Would you need to add a transducer switch, or is there a way to put a ducer Y so that you can keep both the SI and DI ducers working at the same time (like the 2d transducer set ups)?

[rnvinc]

The HB TS3 switch just makes it convenient to switch back and forth from the stock HDSI xducer and the DI xducer...

It's all right here...
http://forums.sideimagingsoft.com/index.php?topic=5388.0

Rickie

[glasscat]

Have read using DI ducer on SI locator leaves open circuit, which could damage unit. If using this setup, are you selecting DI or using SI set to one side.

[Rotus623]

Yea rickies link says it all. Thanks.

[rnvinc]

Have read using DI ducer on SI locator leaves open circuit, which could damage unit. If using this setup, are you selecting DI or using SI set to one side.

The common understanding of "leaving an open circuit" needs to be clarified a little...

There is a difference in "leaving a channel open" and "leaving a transmitter transmitting with nowhere to accept the pulse"...

There is 1 "transmitter" of the SI signal....this 1 transmitter's pulse is split...to be sent down the left and right SI "channel"....

With a DI xducer attached...the pin configuration of the DI piezo's "channel" lines up with the right SI "channel" in the head unit..

This leaves the left SI "channel" (of the head unit) open...

This does not "leave the transmitter transmitting with nowhere to go"....the transmitter's pulse is still going down the right SI "channel"...albeit directed to the pin in the DI xducer cable that leads to the DI piezo (of the DI xducer)...

Now...if there were, indeed...2 separate "transmitters"...1 for left SI and 1 for right SI...this would be a problem...but that is not the case here...

Or...that's the way I understand it anyway...

Rickie

[rnvinc]

To answer your other part of the question...

With the DI xducer attached...:

*Any SI view will only show echo data on the right side of the SI image...the left side of the SI image will be black....(because the left SI "channel" of the head unit "stops" at the DI xducer cable connector-no pin in the DI xducer cable to line up with the left SI channel of the head unit)...

*Any DI view will look like a normal "DI from SI" view...(because the DI view in a SI unit is an overlay combination of both the left SI and right SI...think right SI data overlayed with transparent-blank- left SI data)...

*Setting the DI width (under the Sonar tab)...to "Narrow" will show NO DI image in any DI view...because the "Narrow" setting only shows echo data common in BOTH left SI and right SI...and because there is no left SI data...there can be NO common data to show...(in the "Narrow DI Width" setting)...

Rickie

[Rickard]

Rickie,
 
Are you 100% sure about this:

 There is 1 "transmitter" of the SI signal....this 1 transmitter's pulse is split...to be sent down the left and right SI "channel"....

I know the SI channels at least must be extremely well synchronized, but do they really use one and the same transmitter? If so, both channels could be connected to the same DI element with some interesting options. Would the result be an improved DI from SI image?
 
Rickard

[rnvinc]

Rickie,
 
Are you 100% sure about this:
I know the SI channels at least must be extremely well synchronized, but do they really use one and the same transmitter? If so, both channels could be connected to the same DI element with some interesting options. Would the result be an improved DI from SI image?
 
Rickard

No I'm not 100% sure...this is just the way I understood Doug explain it...

Here's Doug's quote...

It's the transmitter you are worried about. Since SI and DI use the same frequency the transmitter is still transmitting thru a DI Transducer or SI Transducer. On SI transducer it's transmitting thru two elements.

Post #8 in this thread...
http://www.bbcboards.net/humminbird-sonar-gps/368296-brent-erhler-di-transducer-1198-a.html

Rickie

[Humminbird_Greg]

The 800/900/1100 series Si units have a seperate left and right transmitter.

[glasscat]

So now back to the question of a dedicated DI transducer on a SI unit. Has anyone run this setup for any length of time. If so problems?

[rnvinc]

The 800/900/1100 series Si units have a seperate left and right transmitter.

Well I learn something every day...

Rickie