Thread: HDS 7 touch help

It depends on how wide the river or area your in. If it isn't wide you going to get a black picture further out bc that's the land above the water.

In this picture the canal I'm in isn't wide at all. couldn't turn around in a 21ft boat without backing up and turning etc

Originally Posted by ibmack

on your set up, have you chosen the correct transducer. make sure you are using "generic 83/200" if you have the gen2 7 touch. where is your sonar transducer? I did not see it. it should be about 3/4 inches from the lsss2 and slightly higher, say 1/4" or so.

Well the 2D transducer is the one for the Elite 7 HDI so I have it set for the 83/200/455/800 which is the setting for that particular transducer.

what do you consider to be shallow water? in 10 feet, I can see out 40 feet just dandy on 800. just trying to get a better feel on why to ever use the hds gen2 side scan on 455.

Originally Posted by SeaRay

Well the 2D transducer is the one for the Elite 7 HDI so I have it set for the 83/200/455/800 which is the setting for that particular transducer.

ok, sorry. thought we we talking about an hds gen2 7 touch with side scan, di, and 2d transducers, not the hdi elite. my bad.

It is the HDS 7 touch but I swapped out the Elite 7 with Lowrance for this unit since the TDs were compatible, I added the LSS2 after I got the unit on the boat. I used the setting for the 2D that I had used on the Elite 7, which is what Lowrance Tec support told me to do. At the time I did not have the LSS2 installed.

see the section on "frequency" on page 61 of the hds gen2 touch operation manual. you might also set the transducer to generic 80/200 just to see how that affects what you see on side scan. just saying.

Please excuse the HB depiction ... But it serves the same reason of discussion ...(And it's basically the same info as cane pole has already posted) ...



Although Lowrance doesn't advertise their SI beam angle specs ...most opinions agree that the total SI coverage in the Lowrance Structure Scan is approximately 130° for the 800kHz SI beam ...

General piezo design of "Dual Frequency piezoes" usually creates the scenario where the lower frequency sound pulse (fired thru the same piezo) will create a somewhat wider coverage angle spec ...

Again... Lowrance doesn't publish this spec ...but we can garner from this theory that the lower frequency will generally have more range (due to wider angle) than the higher frequency (we guess this at about 150° total coverage)... (Thus Monte's idea that he sees farther with the lower frequency 455kHz) ...

The "other" factor in "Dual Frequency" piezo design is that higher frequencies will always render more detail than lower frequencies thru the same piezo ... (Thus ibmack's idea that he sees better detail with the higher frequency 800kHz) ...

Now even more "other" factors ...

Enviromental variables will always have a huge factor on the range effectiveness in all SI images (regardless of brand) ...

*Water particulate will absorb some of the sound pulse ...leaving less pulse strength to return to the xducer ...
*Soft bottom composition will absorb some of the sound pulse ...leaving less pulse strength to return to the xducer ...

The range limitation in the Lowrance Structure Scan SI is no more (nor less) than the facts of sonar sound wave theory ...and its properties as influenced by the underwater Enviromental variables ...

The only "controllable" factor lies in the specific piezo design for its "Dual Frequency" piezo ...(which is limited to approximately 150° total coverage simply because of patents held by HB ...as far as any information I can find) ...

Rickie