User Manual

Marine Systems
Aviation Recorders
Page 3--4
165M1161--00Initial Issue
Aug. 23/10
(1) Position the antenna mounting bracket on a rigid and structurally sound surface
and install the antenna.
(2) Run the coaxial cable from the antenna to the AIS AtoN location.
(3) Trim the cable, leaving a few inches of slack at the AIS AtoN.
(4) Attach the connectors to the end of the coaxial cable. Solder the connection.
(5) To make sure that the cable is not shorted, check it with an ohm meter.
(6) Connect the cables to the AIS AtoN.
3.9. Install the GPS Antenna
Since the synchronization of internal transmission of the AtoN AIS relies on the ac-
curacy of the time signal obtained from the GPS system, the correct installation of
this antenna is crucial. To enhance good transmission, purchase a high quality GPS
antenna from an established source and follow all of the manufacturer’s instructions,
paying particular attention to the cable routing and connector installation. Figure 3--2
illustrates a typical GPS antenna setup.
9 Meters
30 Feet
RG213RG214
Coaxial Cable
GPS Antenna
5VDC
<3.0 VSWR
30dbl Total Gain
50 ohm
GPS
VHF
N Connector
TNC Male
Connector
Figure 3--2. GPS Antenna Setup
When installing the GPS antenna, consider the following.
F Be sure no obstructions are between the antenna and the sky.
F Since GPS signals can be affected negatively by VHF transmissions, try to
position the GPS antenna at least 3 meters from the VHF antenna.
F Position the antenna as high as possible to prevent ice or spray from neg-
atively a ffecting signal reception.