
VHF ANTENNA
GPS ANTENNA
• A dedicated VHF antenna or Vesper Marine AIS/VHF Antenna Splitter
is required.
• Choose a high quality omnidirectional VHF antenna designed for the marine
band (156-162MHz) and ensure it is well tuned at the AIS end of the band
(VSWR 2:1 or less at 162MHz).
• Mount the antenna as high as possible (at least 2-3 metres (6-10 ft) above the
water surface). It is not recommended to place the VHF antenna near a mast
or other metal structures.
• For best performance avoid using small helical “rubber duck” style antennas.
CAUTION: Install the antenna a minimum of 1m (4 ft) from any other VHF or HF
antennas and not within the beam path of a radar. Inadequate separation
may damage the XB transponder and void your warranty.
CAUTION: Never operate this device unless it is connected directly to a
suitable VHF antenna or Vesper Marine AIS/VHF Antenna Splitter.
CAUTION: The Vesper Marine AIS/VHF Antenna Splitter is designed specifically
for use with Vesper Marine AIS transponders. Do not use any other VHF
antenna splitter. The use of any other splitter may damage the device and
void your warranty.
HINT: Use the VSWR meter in vmAIS or the WatchMate app (see configuration
section) to check your antenna system installation.
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• The XB requires a GPS fix before it can transmit its position.
• You cannot share an external GPS antenna.
• You cannot use another GPS or any other NMEA device to provide a GPS
position to the XB. Class B AIS transponders are required by international
regulations to use their own GPS.
• However, you can use the XB to provide GPS position data to other devices
using NMEA 0183, NMEA 2000, USB or WiFi (XB-8000)
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CAUTION: The Vesper Marine GPS antenna is designed specifically for use
with Vesper Marine AIS transponders. Performance cannot be assured unless
you use a Vesper Marine GPS antenna. Use of a different GPS antenna may
damage the XB transponder and void your warranty.