Had trouble for 2 years with RayM AIS
250. Losing reception
after ± 30 minutes warm-up, losing all signals on the plotter screen
but the RM plotter still sees the AIS
It has been in twice with Raymarine
in the UK. The first time they reported "no problems" "it received about 20 targets in a 5 hour span" which did not convince me at all.... After functioning initially and receiving information (an be seen from a flickering red led) it stops receiving.
I now received a brand new AIS from Raymarine
, even out of warranty! Thanks Raymarine!
However, I want to avoid getting the same problem for which I have 2 suspicions:
1) after initial installation
using the masttop VHF antenna
through the splitter in the AIS250, I remarked interference
from the unit on the adjacent marine VHF
frequencies in my old Icom
80H VHF. I then installed a dedicated AIS antenna
on the pushpit. This received well enough, goen the interference
, but it is on the opposite side of the SSB-sloping "alternative backstay" wire antenna, about 3 meters away.
=> MAYBE THIS BLOWED SOMETHING IN A RECEIVER STAGE OF THE AIS250?
(I now went back to using the splitter and masttop antenna)
2) the RayM installation
manual states "installing the AIS250 blackbox minimum 2m away from an SSB
transceiver and 1 m away from a marine
VHF "to avoid EMC issues". Mine is only about 50cm (0.5m) away from those...
=> CAN THIS BE THE CAUSE OF PERMANENT DAMMAGE?
Glad to hear your opinion and eventual precaution advice. (did install large clamp-on ferrites at the AIS blackbox.