Справочник Пользователя для Zeni Lite Buoy Co. Ltd. 4180026
Installation
Page 22
5.7 Installing and connecting a GNSS antenna
The installation requires an external GNSS antenna specified as follows:
● Centre frequency 1575.42MHz for GPS operation.
● Active antenna with overall gain of at least 20dB
● Bias voltage 3.3V
● Impedance 50 Ohms
● VSWR <2.0
● Active antenna with overall gain of at least 20dB
● Bias voltage 3.3V
● Impedance 50 Ohms
● VSWR <2.0
When installing the transceiver GNSS antenna:
● Make sure the antenna has a clear view of the sky with no overhead obstructions
● Position the antenna as far as possible from any VHF or other transmitting antennas
● Position the antenna as high as possible on the physical aid to navigation.
● Position the antenna as far as possible from any VHF or other transmitting antennas
● Position the antenna as high as possible on the physical aid to navigation.
It is recommended that high quality RG213 or RG214 co-axial cable is used to connect the GNSS antenna to
the transceiver. The antenna cable should be as short as possible and no more than 10 metres (30 feet) in
length.
the transceiver. The antenna cable should be as short as possible and no more than 10 metres (30 feet) in
length.
5.8 Installing the earth connection
It is recommended that the enclosure is connected to an external earthing point. The ground stud shown in
Figure 6 should be used for this purpose along with the supplied ring terminal, washer and nut.
Figure 6 should be used for this purpose along with the supplied ring terminal, washer and nut.
T1
T1+S
T3
T3+S
!
The performance and reliability of the GNSS antenna is essential to correct operation of the
transceiver. Ensure that a high quality antenna suitable for use in harsh environmental
conditions is selected. Ensure all co-axial connections are well made and watertight.
transceiver. Ensure that a high quality antenna suitable for use in harsh environmental
conditions is selected. Ensure all co-axial connections are well made and watertight.
!
The GNSS antenna should be installed according to the manufacturer's instructions.