Unit installation

FS 70 Installation Instructions
974-24007001/4.1 63
The PI Geometry sensors are mounted behind the headrope at the
top of the trawl opening, or behind the footrope at the bottom
depending on the required application.
The two Mini-R responders are normally mounted in dedicated
adaptors on the two doors. They may also be mounted on the trawl
wings.
Communication link between the PI sensors and the two Mini-R
responders may be done via the FS 70 head rope unit forward
hydrophone located inside the DP housing or via the PI hydrophone
mounted below the ship hull.
Refer to the SIMRAD supplied PI Net Geometry Installation
Manual for additional information.
4.3.24 PI Receiver Basic Configuration Settings
When you put the PI Geometry to use, you must set it up with one
unique sensor number with two measurements. Only one update
rate can be chosen, this is common for both measurements. The
channel numbers are defined individually for the two
measurements.
Both the update rate and the channel numbers must be chosen
according to the sensor’s configuration. Write down this
configuration for future reference.
For default settings, to the SIMRAD supplied PI Net Geometry
Installation Manual table in section about sensor configuration.
If your PI system is fitted with MMI software version 0.50 and DSP
software version 1.11 or later, use the following recommended
receiver settings:
– Interference filter: On
– Interference filter level: 8
– Sensor filter: Light
– Catch/Bottom sensor filter: Light
– AGC: Off
– Manual gain: 20 dB
– Multipath filter: On
– Water profile: Salt
– Detection threshold (DT): 8 dB
– Maximum shooting speed: 1 knot