AIS CTRX GRAPHENE Class B AIS Transponder Manual
1.4E 36 CTRX GRAPHENE Manual
SOME FREQUENTLY ASKED QUESTIONS
Q: Is it possible to use an existing VHF antenna for my AIS CTRX GRAPHENE+?
A: The AIS CTRX GRAPHENE+ has a built-in antenna switch which makes it
possible to share the antenna between the transponder and the VHF radio. Sharing
the antenna will add some attenuation of the signal in receive mode but during
transmission with either the VHF radio or the transponder full power will reach the
antenna. The antenna height is extremely important for range, especially on a
sailboat where the antenna can be placed on top of the mast. If a separate antenna
is used, it should be placed at least 3 m above the water to be able to cover a range
of 10 nm.
Q: Can an existing GPS antenna be used for my AIS CTRX GRAPHENE, i.e. the one
which I already have to my plotter?
A: A GPS Signal can also be divided using a signal splitter which often is a more
expensive alternative compared to installing a separate antenna for the AIS
transponder. With AIS CTRX GRAPHENE and a separate GPS antenna the
transponder will provide a backup source for position, speed and course, which can
be used with the onboard navigational system.
Q: What type of GPS and VHF antenna should I use with my AIS CTRX
GRAPHENE?
A: The antennas should meet the following requirements:
The GPS antenna should have the following performance:
Antenna type: RHCP, patch or quadrifilar type.
Power feed: 5V DC
LNA gain: 20 dB (min)
Impedance: 50 ohm
Connector type on AIS CTRX GRAPHENE: TNC female
The VHF antenna shall have the following performance:
Antenna type: Vertical radiator (dipole)
Antenna gain : 0 – 3 dBd
Impedance: 50 ohm
There are specially tuned AIS antennas available today which provide better
performance because they are tuned to the frequencies used by the AIS
transponder. Contact True Heading AB for more information.
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