User's Manual
Table Of Contents
- Safety summary
- Preface
- Training information
- About this manual
- Introduction
- Installation
- Interface description
- Configuration
- Service & maintenance
- Technical specifications
- NMEA sentences
- B.1 NMEA sentences used
- B.2 Sentence use reference
- B.2.1 ABK - AIS addressed and binary broadcast acknowledgement (output)
- B.2.2 ABM - AIS addressed binary and safety related message (input)
- B.2.3 ACA - AIS channel assignment message (input / output)
- B.2.4 ACK - Acknowledge alarm (input)
- B.2.5 AIR - AIS interrogation request (input)
- B.2.6 ALR - Set alarm state (output)
- B.2.7 BBM - AIS broadcast binary message (input)
- B.2.8 DTM - Datum reference (input)
- B.2.9 EPV - Command or report equipment property value (input / response output)
- B.2.10 GBS - GNSS satellite fault detection (input)
- B.2.11 GGA - Global positioning system (GPS) fix data (input)
- B.2.12 GNS - Fix data (input)
- B.2.13 HBT - Heartbeat supervision sentence (input)
- B.2.14 HDT - Heading true (input)
- B.2.15 LR1 - AIS long-range reply sentence 1 (output)
- B.2.16 LR2 - AIS long-range reply sentence 2 (output)
- B.2.17 LR3 - AIS long-range reply sentence 3 (output)
- B.2.18 LRF - AIS long-range function (input / output)
- B.2.19 LRI - AIS long-range interrogation (input / output)
- B.2.20 NAK - Negative acknowledgement (output)
- B.2.21 PTHRAOC - AIS operational control (input / output)
- B.2.22 PTHRROS - Radio operational status (output)
- B.2.23 RMC - Recommended minimum specific GNSS data (input)
- B.2.24 ROT - Rate of turn (input)
- B.2.25 SPW - Security password sentence (input)
- B.2.26 SSD - AIS ship static data (input / output)
- B.2.27 THS -True heading and status (input)
- B.2.28 TRL - AIS transmitter non functioning log (output)
- B.2.29 TXT - Text transmission (output)
- B.2.30 VBW - Dual ground/water speed (input)
- B.2.31 VDM - AIS VHF data-link message (output)
- B.2.32 VDO - AIS VHF data-link own-vessel report (output)
- B.2.33 VER - Version (output)
- B.2.34 VSD - AIS voyage static data (input / output)
- B.2.35 VTG - Course over ground and ground speed (input)
- B.2.36 ZDA - Time and Date (output)
- Supported keys
- Glossary
- Index
VHF and GPS antenna installation
3-4 Chapter 3: Installation 98-137573-A
3.2.3 VHF RX/TX antenna
In installations with two or more units it is important to ensure the optimum performance
of these by carefully selecting the antenna positions for both units. It is recommended to
maximize the RF attenuation between the VHF RX/TX antennas in the installation. You can
ensure this by not having the RX/TX antennas positioned at the same horizontal level, i.e.
the RX/TX antennas for each radio must be installed at shifted elevations as shown in the
following drawing.
If sufficient vertical distance between two or more such antennas cannot be achieved, the
horizontal distance between them is increasingly important for optimum performance. If
there is hardly any vertical separation ensure that there is a minimum of 5 m horizontal
distance between any RX/TX antennas in the installation.
To minimize any increase in VSWR of the VHF RX/TX antenna, install the antenna at a
vertical distance of at least 2 m to any other mast, pole or other RF antennas. Keep VHF
antennas as far away as possible from the antenna main beam of any radar and satellite
equipment.
Figure 3-2: Antenna positioning
RX/TX
or combined
VHF DSC
VHF
GPS for AIS
AIS VHF
AIS VHF/GPS
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