StrataBox
ID #1000
StrataBox in shallow water
Question: How do I optimize shallow water performance"?
Answer: 2 meters is about the minimum depth that the Stratabox will operate as shipped. By using the 150 ohm damping resistor (as defined in a previous e-mail), you should be able to decrease that to maybe 1m or so. If you are trying to survey in 2 - 3m then we recommend you use the damping resistor.
A gain value of 40db is too high for operating the Stratabox under almost any conditions, especially in shallow water. To correctly operate your Stratabox in very shallow water, you should start with your BT GAIN at 0.0 and your DC GAIN at 0 dB as well. You can then slowly increment your DC GAIN to the point where you start to digitize on the bottom. For very shallow water conditions that would be in the range of 0 to 15dB. Once you digitize on the correct bottom you can then add BT GAIN (bottom triggered) to better accentuate your sub-bottom record. Again, you want to increment slowly. Typically .2 to .3 works well under most conditions. Also, note that your BT GAIN only works properly when you have an accurate digitized depth. If you are having problems digitizing on the correct bottom you can also use the GATES feature and put in an upper and lower depth limits.
For sub-bottom profiling less gain is always better so as to not "wash out" your data. Especially if you are using post processing software you can always add gain later but you cannot subtract gain from the record.
Hopefully I have answered your questions. If you have further questions please send us examples of your problems (odc files and/or screen captures) and we can assist you further.
Last update: 2008-09-10 11:05
Author: Frank Budz
Revision: 1.1
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