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Old 23-12-2015, 06:44   #76
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Re: Which AIS antenna splitter

Thanks. I did try to download that, but it timed out because I am on such a poor connection. I just tried again with no luck. It must be a large file.

Can anyone help a poor guy out and tell me what they spec for losses?

Mark
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Old 23-12-2015, 06:57   #77
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Re: Which AIS antenna splitter

AISS120 ANTENNA SPLITTER
Dimensions (mm) L x W x H 140 x 100 x 42
Weight 250 grams
Power DC (9.6 V - 31.2 V)
Current < 150 mA at 12 V DC
VHF AIS Frequency Range 156 MHz to 163 MHz
Environmental *Water resistant to IPX7,
Operating temperature: -10 to +55 deg C.
Insertion Loss AIS & VHF Receive Paths 0 dB
Insertion Loss AIS & VHF Transmit Paths < 1 dB
Max Input Power, AIS Port 12.5 W
Max input Power, VHF Port 25 W
Min Input Power VHF Port 100 mW
AIS, VHF & Antenna Port Impedance 50 Ohms
FM Port Impedance 75 Ohms Switching time,
Receive to AIS Transmit <10 us
Switching Time, Receive to VHF Transmit <10 us
Warranty 1 year
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Old 23-12-2015, 11:14   #78
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Re: Which AIS antenna splitter

Well those look good - right up there with the Vesper, Navico, Sci-tex, and that other one I'm forgetting. It seems like the days of high-loss splitters are ending and more good ones are widely available.

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Old 23-12-2015, 12:42   #79
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Re: Which AIS antenna splitter

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Originally Posted by a64pilot View Post
Even then I'd give it a try before going the external antenna route, my Vesper is mounted directly under my VHF so I was sure I'd need an external antenna, but it tracks satellites fine without one.
My old boat was stored inside of a metal aircraft hangar and the 740S was installed under a metal T top, but even inside of a closed metal building the thing tracked satellites with only a little degradation, newer GPS's are phenomenal.
I mounted an external GPS antenna for my AIS on the stern rail. There is a bimini and an arch with solar panels not that far away. It worked great for a long time. But now that I have transitioned to the southern hemisphere I find it dropping GPS fixes on occasion as the boat rotates. I suspect that the angle of the satellites is different down here and that highlights the mounting position issues.
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Old 23-12-2015, 12:58   #80
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Re: Which AIS antenna splitter

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I mounted an external GPS antenna for my AIS on the stern rail. There is a bimini and an arch with solar panels not that far away. It worked great for a long time. But now that I have transitioned to the southern hemisphere I find it dropping GPS fixes on occasion as the boat rotates. I suspect that the angle of the satellites is different down here and that highlights the mounting position issues.

I had a similar problem when flying well above the Arctic Circle. I assumed it was because the Satellites were so low on the horizon.
Good point though as my Vesper works fine in Florida does not mean it will be fine in other parts of the world.


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Old 23-12-2015, 13:19   #81
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Re: Which AIS antenna splitter

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I had a similar problem when flying well above the Arctic Circle. I assumed it was because the Satellites were so low on the horizon.
Good point though as my Vesper works fine in Florida does not mean it will be fine in other parts of the world.


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Fortunately that's higher latitudes than I plan to go
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Old 23-12-2015, 18:12   #82
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Re: Which AIS antenna splitter

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Well those look good - right up there with the Vesper, Navico, Sci-tex, and that other one I'm forgetting. It seems like the days of high-loss splitters are ending and more good ones are widely available.

Mark
The enclosure looks to be exactly the same as the Si-Tex splitter. Probably the same manufacturer.
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