View Single Post
Old 04-28-2010, 01:22 PM   #7
RickB
Scraping Paint
 
City: Fort Lauderdale
Vessel Model: CHB 48 Zodiac YL 4.2
Join Date: Oct 2007
Posts: 3,804
RE: AIS / VHF Splitter

Quote:
boogiediver wrote:
*I didn't know you can't operate AIS and VHF simultaneously,
*That isn't necessarily true either. It is true if you are trying to use the same antenna but not true if you have separate and separated antennas.

The band is the same but the frequencies are different so if your VHF transmitting antenna is far enough away from the AIS receiving antenna*so it*does not overload the front end then you will not have any problems.

The reason your alarm goes off is probably because the switch you are using puts the AIS antenna to ground in order to protect it from the RF signal just millimeters away from the switch contact and the plotter detects a loss of signal. If you have a separate receive antenna, even if the receiver*is swamped*temporarily and you lose incoming data, the radio still has a signal and doesn't cry wolf.
RickB is offline   Reply With Quote