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post #21 of 42 Old 02-13-2007
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All dsc radios have a number, a phone number if you will. That number can be generated by the dsc radio and used to call or set off an alarm in the ship. Changes are, there would not be many ships in the same area. I did not say a all ships call. You may find the dsc to be a much better tool at sea then a radar reflector. Also, the radios dsc number could also be used to "call or ring" a friends boat.
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post #22 of 42 Old 02-13-2007
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Quote:
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All dsc radios have a number, a phone number if you will. That number can be generated by the dsc radio and used to call or set off an alarm in the ship. Changes are, there would not be many ships in the same area. I did not say a all ships call. You may find the dsc to be a much better tool at sea then a radar reflector. Also, the radios dsc number could also be used to "call or ring" a friends boat.
Ok - so this ship is coming at you at night, so its difficult to read his name and even if you can, do you know his MMSI? You try him on channel 16, no answer, then on channel 13, no answer, etc.. Or you can hit the all-ships call, maybe that will wake him up.
Now add AIS, and the picture looks a lot better, because the AIS should give you his MMSI.
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post #23 of 42 Old 02-13-2007
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Ok - so this ship is coming at you at night, so its difficult to read his name and even if you can, do you know his MMSI? You try him on channel 16, no answer, then on channel 13, no answer, etc.. Or you can hit the all-ships call, maybe that will wake him up.
Now add AIS, and the picture looks a lot better, because the AIS should give you his MMSI.
You won't know his MMSI, but AIS would give you that. However, lacking AIS, you could do an Securité type call over DSC and that would help ensure that they would hear the message.

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post #24 of 42 Old 02-13-2007
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... you could do an Securité type call over DSC and that would help ensure that they would hear the message.
And a wake-up call for everyone else in range too.
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post #25 of 42 Old 02-13-2007
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So your worring about waking people and not about a ship possibly running you down ?
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post #26 of 42 Old 02-13-2007
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I'd prefer to have as many witnesses to someone being stupid enough to try and run me down, rather than have them do it and no one the wiser... but that's just me.

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post #27 of 42 Old 02-13-2007
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I have the ICOM with DSC and a WHAM remote. I like the remote because it can be used as a walkie talkie with the base. Like if you go ashore in your dink and want to talk to the boat.It is also rechargeable from the house bank of batteries while in it's cradle. I also carry a hummingbird hand held as a back up, but it does not have mimse or DSC.
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post #28 of 42 Old 02-13-2007
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FWIW --

Running two VHF radios into a single antenna is not a good idea.

With both of them connected to the antena, when you transmit on radio A, you may burn out the receiver of radio B.

I second the opinion of having both a fixed-mount VHF, and a handheld. That's worked pretty well for me over the years.

Charles
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post #29 of 42 Old 02-13-2007
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FWIW --

Running two VHF radios into a single antenna is not a good idea.

With both of them connected to the antena, when you transmit on radio A, you may burn out the receiver of radio B.

I second the opinion of having both a fixed-mount VHF, and a handheld. That's worked pretty well for me over the years.

Charles
This is very true...which is why I said you need to have a switch, to select which VHF is connected to the antenna.

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post #30 of 42 Old 02-13-2007
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cpcohen...there are antenna switches tha prevent that.


A second full power VHF as a backup does not negate the benefits of a portable for non critical or battery failure use.
I would use the single antenna on the switch for backup and then have an emergency antenna stashed in case of mast/antenna loss.
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