Seiwa Si-Tex MDA3 - Manual (Page 17)

Page 14
Operation
4 Operation
Operation of the AIS antenna splitter is automatic and requires no user intervention.
During operation the antenna splitter will share signals received at your VHF antenna with both the AIS transceiver and the VHF radio.
When either the AIS transceiver or VHF radio transmits, the AIS antenna splitter will automatically sense the transmission and route the
signal to the antenna.
In the event that both the VHF radio and AIS transceiver are transmitting at the same time, the AIS antenna splitter will give priority to
the VHF radio.
4.1 Indicator functions
The AIS antenna splitter includes three coloured indicators as shown in Figure 10. The state of the indicators provides information
regarding the status of the AIS antenna splitter.
Figure 10 Indicator location on the AIS antenna splitter unit
The indicators provide the following functions:
•
Power - this indicator is illuminated whilst the unit is powered
• TX AIS - this indicator flashes to indicate AIS transmissions
• TX VHF - this indicator flashes to indicate VHF radio transmissions
Note that both the TX AIS and TX VHF LEDs may illuminate when the AIS antenna splitter is used with some brands of VHF radio at the
high output power (25W) setting. This is normal behavior and does not indicate a fault.
It is not possible for both connected devices to transmit simultaneously using a single VHF antenna. Whilst you are
talking on your VHF radio no AIS position reports will be transmitted.
!
Green
(Power)
Yellow
(AIS TX)
Yellow
(VHF TX)
Indicator lights