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Old 08-11-2011, 13:27   #1
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Raymarine AIS

I am concidering the installation of a Raymarine AIS250 to interface with my C80.

The raymarine installation manual suggests that there is a (light)HF reception and transmission using the AIS box to feed a radio. I would far sooner not install two antenna's.

can anybody tell me their experience and if the VHF radio reception is adversly effected.

Thanks a Million

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Old 08-11-2011, 14:24   #2
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I have the Ais 500 integrated with plotter E120 ...... Never noticed any interference on my radio yet.
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Old 09-11-2011, 03:58   #3
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Re: Raymarine AIS

Hi Fletch,

I have installed the Raymarine AIS 250 with my RM C90W plotter.

Originally I also used the splitter function offered by the AIS 250:

- the masttop VHF antenna cable into the AIS 250
- the antenna out towards the marine VHF
- even the FM radio antenna in connected to the dedicated OUT socket on the AIS 250

With this setup:
- the AIS reception is SUPER since it uses the 14m high masttop VHF antenna with low loss coaxial cable - receiving AIS data from very high distances > 30 NM
- no perceivable losses on reception signals on the marine vHF over the splitter
- BUT interference from the AIS onto marine VHF channels adjacent (e.g. european channel 27 which is a duplex channel often used by shore stations) to the 2 dedicated AIS frequencies (161.975 and 162.025 if I am not mistaken). This not only happens with the Icom M80 marine VHF but also when using my Yaesu FT897D Ham transceiver on those frequencies.

Please check this if you use those adjacent channels often on reception!
I checked: US marine VHF channels 27,28 and 86 are close by AIS1 CH 161.975 MHz.

My solution: I stopped using the AIS250 onboard antenna splitter and installed a dedicated AIS receiving antenna on the transom. Although far lower I still receive AIS signals from 20 NM away. Plenty. It also means I have a spare/emergency VHF antenna in case I lose the masttop antenna.

I did not check if installing choking toroids or moving the AIS250 further away (not practical in my case) helps.

MY advice: if adjacent channels are of no use for you, use the splitter and the masttop VHF antenna. If in doubt about insertion losses of the splitter: do a TX/RX test with a far away shore station but with a standard marine VHF you can only rely on the audio since it will have no S-meter. Inseertion losses on transmit will be next to nothing since you only pass a relay.

There has been a very popular thread on AIS spliiters and insertion losses on this forum.

Good luck,

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