In its most basic form, a VHF/AIS splitter is a device that splits an RF signal allowing it to be shared across multiple devices, in this case allowing a VHF and AIS to share a single antenna. …
Do I need a special antenna for AIS?
Receive only AIS units are being integrated into many of the newer VHF radios. It will have an internal splitter between the two and only one antenna input. For this scenario a VHF antenna is needed.
Where do I put the AIS antenna?
1. An AIS transceiver equipped with its own coaxial cable, leading to a dedicated AIS antenna located at least three meters above the water and at least four feet from another VHF antenna or conductive material.
What is AIS antenna?
AIS or the Universal Shipborne Automatic Identification System (AIS) is a ship transponder system that is currently used by most of the commercial shipping industry. AIS uses two marine VHF channels.
How far apart do VHF antennas need to be?
A good rule is to keep antennas at least 1/2 wavelength apart or at least 3ft at VHF and even at that spacing the radiation pattern may look like a clover leaf with good signal going out in four directions and lousy performance in between the clover leaf pattern.
Do VHF antennas go bad?
Marine VHF antennas almost never go bad, unless they are physically damaged or water is allowed to intrude into the loading coil.
What is the maximum range of AIS?
AIS enables authorities to reliably and cost effectively monitor fishing vessel activities along their coast line, typically out to a range of 100 km (60 mi), depending on location and quality of coast based receivers/base stations with supplementary data from satellite based networks.
Do I need an antenna for VHF?
VHF antennas are a crucial part of your VHF installation. The main purpose of a VHF antenna is to provide a radiator for the power that the transmitter in the radio produces and to radiate this energy in the correct direction.
What is the NASA marine AIS SART plotter?
The Nasa Marine AIS SART Plotter is the first stand alone AIS receiver / plotter specifically designed for the leisure boat market. The unit consists of a dual frequency AIS receiver, demodulator, signal processor and a backlit matrix display. It receives an NMEA input (RMC) from the boats GPS which puts the user at the centre…
How does NASA AIS work on a boat?
NASA Marine A.I.S Engine 3. The AIS Engine receives AIS data, converts it to an NMEA format, and sends it on to any display equipped to receive it. The engine can also receive NMEA information from a GPS receiver (at 4800 baud) which it then sends on to the display with the AIS data (at 38,400 baud). Installing the AIS Engine.
What does the AIS display on the radar display show?
The display, with ranges of 0.125, 0.25, 0.5, 1, 2, 4, 8, 16 and 32 nautical miles shows AIS carrying vessels and SART transponders in a format normally associated with conventional radar. A trail of previous positions clearly shows the relative track of all the targets on the screen.
