D-1
APPENDIX D: DIFFERENT TOW CABLE
LENGTHS AND THE
STARTUP.INI FILE
The Series 5000 V2 Sonar System operates at high data rates. For optimum
performance, settings have been provided to tune the system’s uplink for various
cable lengths up to -24 dB of insertion loss. The adjustment settings are made in
the Startup.ini file using the following two lines:
set PREEMPHISIS x
set LBOGAIN x
This file may be opened in any text editor such as Wordpad. After editing, save the
file.
The adjustment parameters are as follows:
set PREEMPHISIS x x = (0-7) SonarPro Command $ML x
set LBOGAIN x x = (0-3) SonarPro Command $MG x
We recommend the following:
For a 15-meter cable,
set PREEMPHISIS 1
set LBOGAIN 0
For a 150-meter cable,
set PREEMPHISIS 3
set LBOGAIN 1
For cables around 600 meters,
set PREEMPHISIS 7
set LBOGAIN 2
For cables that are longer, experimentation with the above settings should be done.
To do this, watch the yellow ERROR indicator on the TPU front panel. Vary the
uplink parameters until error-free operation is achieved. We recommend running
SonarPro and using the Towfish Diagnostics tab of the Sonar Interface dialog box.
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