I would appreciate your thoughts in this matter:
Installed new LED masthead light earlier this year:
It's claimed to have no interference
frequencies. We didn't have time to test it for prolonged period of time before we left on our long term cruise
, it was doing what it was supposed to do (lit up) so I was happy with it. Unfortunately, it turns out it messes with both the radio
and the AIS
. The symptoms are clear. I emailed the supplier but they claim it shouldn't create any interference
. I copy my and their email
here to describe everything:
We started to use the tricombo masthead light that I installed earlier this year, on our cruise
down the remote West coast
, and sadly we realized that it produces a serious interference with both of the VHF
and the AIS systems.
When sailing at night and turning on the tricolour the AIS targets promptly disappear from the chart plotter's screen
(testing proved especially definite at Port Headland with about 50 ships moving and anching around us). If we turn the light off they come back on the screen
, so it definitely is the root of the problem.
When the anchor
light is on, either on stand-by mode, or alight after dark the VHF radio
can't be used as it constantly crackling with squelch noise
and no setting will change that.
We have the VHF antenna
and the Tricombo masthead light on the top of the mast
but with a fairly big distance between them (about 500mm) and the antenna
works with the radio and the AIS via a splitter. (Connecting the antenna directly to the VHF or the AIS doesn't rectify the situation.)
I'll await for your reply.
Tricombo passed successfully the EN60945 marine
norms concerning the EMC noise
level for all electronic equipement on mast
, with reduced noise level frm 54 to 30 dBμV/m on the 156-165MHZ marine
VHF AIS range
The mode which is the higher in terms of EMC is the SOS mode where we push the power to 7W peak , but even at these power peaks we are under the 30db level.
We can send you the complete lab test
You are the first client encountering such problem .
We can send you a quick video test ( a more talking test ) where we put the Tricombo at 2cm from the antenna of an FM receiver ( 108MHZ so very close to 150-165 MHZ marine VHF ) and you will see that on a pure classic music reception
, you don't listen any noice when we switch on the Tricombo .
You hardly listen a little something when we move to the SOS flash mode
There must be some boat electrical
I wonder if I missed something or there is any other possible explanation? Ultimately how to prove if their claim stands or not?