Next message: ahmet erkan: "Re: lv-ab: Collision Avoidance Via Radio"
I suspect it is, however if I understand the purpose it would only be
used out in the open ocean where 99% of the time no one would be within
hearing range. If someone came back to you after each transmission,
then you shouldn't be trying to sleep. :)
Jim.
Lee Haefele wrote:
> 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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>
>
>
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