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Search took 0.00 seconds. Search: Posts Made By: CatNewBee
Forum: Marine Electronics 25-07-2018, 00:13
Replies: 45
Views: 4,648
Posted By CatNewBee
Re: VHF-transmission identification challenge

AIS and VHF use different transmitters. They have therefore different "finger prints" / characteristics and are unrelated.
Forum: Marine Electronics 19-07-2018, 03:11
Replies: 45
Views: 4,648
Posted By CatNewBee
Re: VHF-transmission identification challenge

That implies, that a rogue, pirate vhf handheld prank, A is on the water and B has turned on transmitting AIS on board. Very unlikely.

The good guys do not need to be identified, thei say their...
Forum: Marine Electronics 18-07-2018, 12:53
Replies: 45
Views: 4,648
Posted By CatNewBee
Re: VHF-transmission identification challenge

DSC is only transmitted on channel 70 and only if you use the DSC call function, all other channel transmit voice only. No DSC at all. DSC datagramms are re-transmitted automatically after a time...
Forum: Marine Electronics 18-07-2018, 06:59
Replies: 45
Views: 4,648
Posted By CatNewBee
Re: VHF-transmission identification challenge

I guess, vessels talking to officials use the protocol carefully and say they vessel name, potentially call sign, to distinguisch between vessels with the same name etc. and comply to the rules of...
Forum: Marine Electronics 18-07-2018, 03:36
Replies: 45
Views: 4,648
Posted By CatNewBee
Re: VHF-transmission identification challenge

That is true, but AIS has a different transmitter than the VHF at the navstation and VHF handhelds are completly separate devices too. With suveillance gear, you can potentially test a particular...
Forum: Marine Electronics 18-07-2018, 02:11
Replies: 45
Views: 4,648
Posted By CatNewBee
Re: VHF-transmission identification challenge

its not reliable. AIS transmitter is a different device than a VHF radio, they (sometimes) may share an antenna, but there is also the usage of handheld radios very common at the helm, so both...
Forum: Marine Electronics 18-07-2018, 00:40
Replies: 45
Views: 4,648
Posted By CatNewBee
Re: VHF-transmission identification challenge

There are regulations all station user has to comply to.
It is a voice based protocol.

First you listen, if there is a conversation on 16.
If not there are various priority calls

distress,...
Forum: Marine Electronics 17-07-2018, 06:53
Replies: 45
Views: 4,648
Posted By CatNewBee
Re: VHF-transmission identification challenge

Can you explain this please, AFAIK, DSC and AIS use separate channels, not related to voice traffic. Basically he wants to know who is calling, this information is only available if DSC is used for...
Forum: Marine Electronics 17-07-2018, 02:05
Replies: 45
Views: 4,648
Posted By CatNewBee
Re: VHF-transmission identification challenge

DSC was invented to do this, but frankly no one really uses it perhaps except for automatic distress calls. Even coast stations viewing your AIS data on the screen are hailing you on 16 by voice only...
Showing results 1 to 9 of 9

 
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