Next message: Paul W. Esterle: "Re: lv-ab: Collision Avoidance Via Radio"
You would need to check FCC regulations to see if this is a legal use of a
Marine VHF, I suspect not. "Channel 16 is for hailing and distress only!"
A few thousand radios auto transmitting every 5 minutes would totally clog
the airwaves. Isn't this all what AIS is?
Lee Haefele
----- Original Message -----
From: "ahmet erkan" <>
To: <>
Sent: Monday, June 12, 2006 10:58 PM
Subject: Re: lv-ab: Collision Avoidance Via Radio
> >I'm not the author, but here's what I'd do.
> .
> .
> .
> .
>>Jim.
>
> Hi Jim,
>
> Unfortunately the list has shown hardly any interest. Your reply and
> hardware suggestions, however are appreciated at least by me.
> I received a few off line responses and decided to drop the subject. As
> they say, win some lose some. The live aboard group is interested in stuff
> that is tried and proven to work. I've been advised to build a prototype,
> test it in an actual voyage and report the results. I will do just that in
> four to five years.
> Here is what I expect to report :
> The five minute timer times out every five minutes. (Duh)
> The transmitter turns on after the timer times out. (Duh)
> The voice chip sends "any station -any station" when the transmitter turns
> on. (Duh)
> The transmitter switches off when the voice chip finishes. (Duh)
> The cycle repeats. (Duh)
>
> Again, this workaround scheme will be useful only if there is someone on
> the bridge of the ship monitoring Channel 16, and responding to a call.
> What I was hoping to do was something much better. I was hoping to get a
> team effort going on the list to refine the automatic system with the
> burst mode operation. I was hoping to write to radio manufacturers and
> tell them there are hundreds of sailors who are interested and would like
> to see the "electronic lookout" function on a basic VHF radio. Here are
> the set of requirements we have developed etc etc. (ie: Do the market
> research for the manufacturer, and let them decide how to implement, work
> out the legal issues and manufacture it.)
> The radio manufacturer probably cannot implement a design that broadcasts
> voice periodically on Ch 16. (Even if they put a switch for the user to
> activate it when at high seas)
> I suspect the manufacturers would do all the sensing at the IF stage (ie:
> detect and integrate the CW for 1mS etc) where the audio circuits would be
> oblivious to the transponder like exchange. basically the whole thing
> would work like two VHF radios detecting each other automatically and
> activating alarms completely independent of the radio operators or crew.
> I am going to send a suggestion to several radio manufacturers anyway and
> ask them if they would consider offering a "electronic lookout" function.
>
>
> All the best,
> Ahmet
> SV8827
>
>
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