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From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
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Date: Sun, 7 Nov 2010 13:39:58 -0000
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Subject: Re: IMO SYNOPTIC was Re: LF: The Wideband Noise
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May be the  FCC  will  designate it as Spread Spectrum  and  ban  it  under 
220 MHz

' data  transmitted in an enhanced  bandwidth , above the  minimum necessary 
'

G..

--------------------------------------------------
From: "Warren Ziegler" <wd2xgj@gmail.com>
Sent: Sunday, November 07, 2010 1:31 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: IMO SYNOPTIC was Re: LF: The Wideband Noise

>
> Terry,
>  Is it possible to get a copy of the whole ITU Part 5B report?
>
> -- 
> 73 Warren K2ORS
>                 WD2XGJ
>                 WD2XSH/23
>                 WE2XEB/2
>                 WE2XGR/1
>
>
>
> On Fri, Nov 5, 2010 at 1:41 PM, Terry GW0EZY <gw0ezy@sky.com> wrote:
>> I guess these tests relate to a proposed new system being discussed in 
>> ITU
>> Working Party 5B:
>>
>> PROPOSED MODIFICATIONS TO PRELIMINARY DRAFT NEW
>> REPORT ITU-R M.[500 kHz]
>> Utilization of the 495-505 kHz band by the maritime mobile
>> service for the digital broadcasting (from shore-to-ships)
>> of information related to safety and security
>>
>> The draft new report has contributions from France and USA. Some extracts
>> from the documents:
>>
>> This preliminary draft Report provides information on a digital 
>> broadcasting
>> system working in the 500 kHz band. This system is intended to be used to
>> broadcast from shore to ships information related to navigational and
>> meteorological warnings, urgent information and other information related 
>> to
>> safety and security. The system will utilize the band 495-505 kHz and 
>> have
>> the same coverage area as the current NAVTEX system operating at 490 kHz 
>> and
>> 518 kHz. New digital technology provides a greatly improved data 
>> throughput
>> from that provided by the current NAVTEX system. It also provides 
>> protection
>> to the incumbent NAVTEX system.
>>
>> This system will operate in a manner similar to the current NAVTEX 
>> system.
>> The coast stations will be spaced along the coast approximately [500]
>> nautical miles apart. All the transmitters on a coast will share the 10 
>> kHz
>> channel by transmitting in a specific time slot. An example of time slot
>> allocations for a network of 500 kHz broadcast transmitters for the 
>> Atlantic
>> coast of Europe is based on 3-minute slots of a 60 minute cycle. There is
>> also discussion on using 495-500 kHz and 500 - 505 kHz as two slots for a
>> "permanent mode"
>>
>> The radiated power from the regional coast station transmitter should be
>> what is sufficient to cover the intended service area of that coast 
>> station.
>> The power would be decreased at night during periods of better r.f.
>> propagation. The estimated coverage area from shore is approximately 320
>> nautical miles with a radiated power of 1 kW and 400 nautical miles with 
>> a
>> radiated power of 5 kW. The modulation is of type OFDM with N-QAM. An
>> example of 64-QAM @ 47.4 kbps.system has a data rate of 100 bit/second 
>> with
>> a 300 Hz channel. This system would have a data rate of up to 47 400
>> bits/second with a 10 kHz channel.
>>
>> A transmitter site in France is mentioned in the report: Pointe de Corsen
>> coordinates: 48.414444 N, 4.794444 W. Google Earth shows some sort of
>> installation there.
>>
>> 73 Terry GW0EZY
>>
>>
>>
>
>