Appendices
Copyright © 2015 Coda Octopus Products Ltd
140
F180R MOTION Sensor User and Reference Guide
Remember – heading, pitch and roll are usually output in degrees, but the functions sin and
cos require these values in radians.
6.4
Troubleshooting
If you are experiencing problems with the F180R System please refer to the following sections
covering system setup, configuration, calibration and operation.
6.4.1 System Troubleshooting
6.4.1.1 Shock Watch
A shock watch sticker has been attached to housing of the F180R System IMU which will
indicate whether an excessive force has been applied to the system. If, on delivery, the F180R
System shock watch has been activated, do the following:
Contact Technical Support at CodaOctopus for further advice. There are a series of in-
field tests that can be performed to ascertain the operational integrity of the F180R
System. If completed successfully the F180R System will still be able to be deployed.
If there are items missing from the F180R System kit, do the following:
Double check the packing list. Call Technical Support for further advice if required.
6.4.1.2 Antenna
Q : Are both antennas the same?
A : The GPS antenna used with the F180R System come in two types :
Antenna for L1 only detection ( Novatel GPS-701 )
Antenna for L1/L2 detection ( Novatel GPS-702 )
The system will be delivered with the correct antenna for the specified receiver pair. Earlier
versions of the F180R System used the Novatel GPS-600-L1 antenna.
Q : The antenna cables are too short for where the antennas have to be mounted, are there
any other options ?
A : The F180R System comes with a standard set of 15m antenna cables with options for 5m
and 30m. For vessel deployments requiring longer cable runs, standard low-loss coaxial cables
can be used with the F180R System. In particular, Belden 9913 and LMR400 cable types have
been used for extended cable runs of up to 45m during F180R System deployment. The length
of the cable run is limited by the GPS signal attenuation which is limited to 14 dB maximum (10
dB nominal) measured at 1575 MHz.
Example :
For Belden 9913. This is a 50 ohm nominal impedance low loss coax cable :
loss/100 ft @ 824 MHz = 3.9 db
loss/100 ft @2000 MHz = 7.0 db
(The GPS L1 is 1575 MHz so the loss is somewhere between 4 and 7 db per / 100 ft )
If the cable run is over 90 metres then the loss may be an issue.
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