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Old 14-08-2020, 16:58   #1
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Embedded antenna splitter problem: RR Electronics

Have an antenna with embedded splitter for VHF, 3G, Fm, Tv.
Performance for AIS have recently seems deteriorated.
VHF seems to work ok.
Have replaced antenna contacts on top of mast.
Have cleaned the antenna, but not tested after that.
The antenna has a kind of embedded system and signals are splitted with embedded card (in antenna box).
I guess these kind of embedded splitter cards can be replaced and upgraded,
E.g for 5G.
Have mailed vendor RR Electronics but they dont answer.
Attache some pictures and happily accept ideas to improve or upgrade the antenna system.
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Old 14-08-2020, 18:24   #2
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Re: Embedded antenna splitter problem: RR Electronics

That isn’t really a splitter as it is an LC circuit duplexer but more importantly, it looks from the picture that a 3 year old did the soldering which is more likely the problem. If so, it is probably fixable if you know how to desolder, clean and re-solder the connections without melting the board.
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Old 15-08-2020, 00:18   #3
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Re: Embedded antenna splitter problem: RR Electronics

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Originally Posted by S/V Illusion View Post
That isnít really a splitter as it is an LC circuit duplexer but more importantly, it looks from the picture that a 3 year old did the soldering which is more likely the problem. If so, it is probably fixable if you know how to desolder, clean and re-solder the connections without melting the board.
In the places where a lot of this stuff is manufactured it's highly likely that a 3 year old did do the soldering.

They may work well for other folks but I've given up on splitters and just install a dedicated antenna for each radio unit.
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Old 16-08-2020, 14:21   #4
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Re: Embedded antenna splitter problem: RR Electronics

Thanks for all suggestions, maybe a bypass of splitter-card will be the pragmatic solution.
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Old 16-08-2020, 14:26   #5
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Re: Embedded antenna splitter problem: RR Electronics

I was taught that splitting the antenna will degrade both the VHF and radio signals. Each should have their own antenna for full performance.
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Old 16-08-2020, 14:39   #6
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Re: Embedded antenna splitter problem: RR Electronics

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I was taught that splitting the antenna will degrade both the VHF and radio signals. Each should have their own antenna for full performance.


I second, this option. Whatís the point, to redundant systems if you merge them into one.?
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Old 16-08-2020, 19:47   #7
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Re: Embedded antenna splitter problem: RR Electronics

A diplexer allows two different devices to share a common communications channel. Typically, the channel is a long coaxial cable, and a diplexer is often used at both ends of the coaxial cable. The plan is feasible if the two devices operate on different frequencies.

That said I need replace hardware at both ends of coaxial cable when upgrade system to e.g 5G.
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Old 17-08-2020, 06:35   #8
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Re: Embedded antenna splitter problem: RR Electronics

I do not believe a diplexer will work for VHF and AIS. Seeing that the two are virtually the same frequency. Diplexers work when they combine two different bands, such as working VHF and UHF frequencies. The LC circuit must be wide enough to present a high impedance to the other set of frequencies essentially blocking their transmission path.

As mentioned and echoed here, go with independent antennas for each service.
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Old 17-08-2020, 12:40   #9
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Re: Embedded antenna splitter problem: RR Electronics

I will bypass the card 👍
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Old 17-08-2020, 15:59   #10
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Re: Embedded antenna splitter problem: RR Electronics

Bypass done
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