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Old 03-07-2020, 03:25   #76
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Re: AIS through satellites.

You are back via Sat! One hour ago... 2054 SA time... abeam the old Ballast Head jetty
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Old 03-07-2020, 04:29   #77
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Re: AIS through satellites.

Meanwhile back in the west a few minutes ago...
Tantabiddi via Albany Base Station on the left... the small icon.... 17 minutes old
Tantabiddi via satellite on the right... big icon....8 minutes old...
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Old 03-07-2020, 05:27   #78
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Re: AIS through satellites.

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Originally Posted by El Pinguino View Post
You are back via Sat! One hour ago... 2054 SA time... abeam the old Ballast Head jetty
Thank you for spottong that, I would have missed it and I would have remained worried!
It can't be coincidence. We appeared on satellite within minutes of leaving American River. It must be Ballast Head obscuring the signal.
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Old 03-07-2020, 05:35   #79
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Re: AIS through satellites.

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Originally Posted by El Pinguino View Post
Meanwhile back in the west a few minutes ago...

Tantabiddi via Albany Base Station on the left... the small icon.... 17 minutes old

Tantabiddi via satellite on the right... big icon....8 minutes old...


Well, we wont do the same. We stopped to sleep for two hours, playing a juggling act on the tides. I didnt want to do the channel at low tide, and I wanted cross Backstairs at slack water, thanks to a reminder from VMR American River. So we turned to starboard within moments of that satellite fix and anchored off Baudlin Beach for a snooze.

Takes a bit of resolve to climb out from under the doona in this sort of weather, as I am sure youd know better than most.
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Old 03-07-2020, 14:45   #80
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Re: AIS through satellites.

At 0643 local time this morning, I sent you an e-mail. You had a 2 min. old position that I saw, too. I figured it was a shore station that had you, rather than via satellite, but I really don't know how to tell.

Ann
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Old 03-07-2020, 15:07   #81
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Re: AIS through satellites.

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At 0643 local time this morning, I sent you an e-mail. You had a 2 min. old position that I saw, too. I figured it was a shore station that had you, rather than via satellite, but I really don't know how to tell.

Ann
Good morning Ann,
Unless you are paying about $US3500 a year in subs the sat derived positions only show ship type, age of position, and no other details.

Land based go into the details ( click on the ship of interest ) and second line from the bottom it will show what shore station the report is coming through. Click on that and you get all the station details.... in this case 3635 WirrinaSRS.

Position is now a bit old... could be the range or the shore station may be offline.
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Old 03-07-2020, 15:36   #82
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Re: AIS through satellites.

Weve sailed out of range of Wirrina and are now covered by Hallet Cove. Only 23 miles to go.Click image for larger version

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Old 03-07-2020, 15:37   #83
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Re: AIS through satellites.

Im going to finish my tea then launch the asym, the wind has dropped.
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Old 05-07-2020, 16:29   #84
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Re: AIS through satellites.

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Originally Posted by sy_gilana View Post
Now to antennas. go to this page

Quadrifilar helicoidal antenna - Javascript on-line calculator
and work on 162 Mhz


This will get your signal up there and to ships. The radiation diagram will almost be spherical.
If your antenna is mounted on your stern rail, you just bend it a good 45-90 degrees and you hit the birds with your 3dB amplified signal. It should put you on the chart, but you have to bend it back.

My strategy is to stay on a cheapish CSTDMA unit as SOTDMA (B+) doesn't help sailing boats much (same transmit frequency as CSTDMA below 14kts) and invest in a good coax and fittings(!): RG58 will quickly halve your output compared to the good old rg213.
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Old 05-07-2020, 16:51   #85
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Re: AIS through satellites.

One good thing about AIS data being received by satellites is that this is how Search and Rescue co-ordination stations identify vessels in the area of a search. Thus they can redirect mership traffic to a SAR situation in their area of operations. Luckily they are willing to pay the subscription fees. At least in the case of Australia. Which does have a rather large area of responsibility, particularly considering their population.
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