From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Date: Fri, 5 Nov 2010 19:14:37 +0100
Thread-Topic: IMO SYNOPTIC was Re: LF: The Wideband Noise
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Subject: RE: IMO SYNOPTIC was Re: LF: The Wideband Noise
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"The estimated coverage area from shore is approximately 320 nautical mile=
s with a radiated power of 1 kW and 400 nautical miles with a radiated pow=
er of 5 kW."

This seems a very conservative estimation to me.

I can hear the stronger G-stations (ERP 1-10W) day and night with solid co=
py at similar distances (with a partly land path).



73, Rik  ON7YD - OR7T



PS: the "bubbles" arround 500kHz are good copy here, but the signal seems=
 to appear/disappear all the tile

________________________________________
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or=
g] namens Terry GW0EZY [gw0ezy@sky.com]
Verzonden: vrijdag 5 november 2010 18:41
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: RE: IMO SYNOPTIC was Re: LF: The Wideband Noise

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 broadcasti=
ng
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 throughpu=
t
from that provided by the current NAVTEX system. It also provides protecti=
on
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 kH=
z
channel by transmitting in a specific time slot. An example of time slot
allocations for a network of 500 kHz broadcast transmitters for the Atlant=
ic
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 statio=
n.
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 wit=
h
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

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<p>&quot;<font color=3D"#ff0000">The estimated coverage area from shore is=
 approximately 320 nautical miles with a radiated power of 1 kW and 400 na=
utical miles with a radiated power of 5 kW</font><font color=3D"#ff0000">.=
</font>&quot;<br>
</p>
<p>This seems a very conservative estimation to me.</p>
<p><font face=3D"times new roman">I can hear the stronger G-stations (ERP=
 1-10W) day and night with solid copy at similar distances (with a partly=
 land path).</font></p>
<p><font face=3D"times new roman"></font>&nbsp;</p>
<p><font face=3D"times new roman">73, Rik&nbsp; ON7YD - OR7T</font></p>
<p><font face=3D"times new roman"></font>&nbsp;</p>
<p><font face=3D"times new roman">PS: the &quot;bubbles&quot; arround 500k=
Hz are good copy here, but the signal seems to appear/disappear all the ti=
le</font></p>
<p><br>
________________________________________<br>
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or=
g] namens Terry GW0EZY [gw0ezy@sky.com]<br>
Verzonden: vrijdag 5 november 2010 18:41<br>
Aan: rsgb_lf_group@blacksheep.org<br>
Onderwerp: RE: IMO SYNOPTIC was Re: LF: The Wideband Noise<br>
<br>
I guess these tests relate to a proposed new system being discussed in ITU=
<br>
Working Party 5B:<br>
<br>
PROPOSED MODIFICATIONS TO PRELIMINARY DRAFT NEW<br>
REPORT ITU-R M.[500 kHz]<br>
Utilization of the 495-505 kHz band by the maritime mobile<br>
service for the digital broadcasting (from shore-to-ships)<br>
of information related to safety and security<br>
<br>
The draft new report has contributions from France and USA. Some extracts<=
br>
from the documents:<br>
<br>
This preliminary draft Report provides information on a digital broadcasti=
ng<br>
system working in the 500 kHz band. This system is intended to be used to<=
br>
broadcast from shore to ships information related to navigational and<br>
meteorological warnings, urgent information and other information related=
 to<br>
safety and security. The system will utilize the band 495-505 kHz and have=
<br>
the same coverage area as the current NAVTEX system operating at 490 kHz=
 and<br>
518 kHz. New digital technology provides a greatly improved data throughpu=
t<br>
from that provided by the current NAVTEX system. It also provides protecti=
on<br>
to the incumbent NAVTEX system.<br>
<br>
This system will operate in a manner similar to the current NAVTEX system.=
<br>
The coast stations will be spaced along the coast approximately [500]<br>
nautical miles apart. All the transmitters on a coast will share the 10 kH=
z<br>
channel by transmitting in a specific time slot. An example of time slot<b=
r>
allocations for a network of 500 kHz broadcast transmitters for the Atlant=
ic<br>
coast of Europe is based on 3-minute slots of a 60 minute cycle. There is<=
br>
also discussion on using 495-500 kHz and 500 - 505 kHz as two slots for a<=
br>
&quot;permanent mode&quot;<br>
<br>
The radiated power from the regional coast station transmitter should be<b=
r>
what is sufficient to cover the intended service area of that coast statio=
n.<br>
The power would be decreased at night during periods of better r.f.<br>
propagation. The estimated coverage area from shore is approximately 320<b=
r>
nautical miles with a radiated power of 1 kW and 400 nautical miles with=
 a<br>
radiated power of 5 kW. The modulation is of type OFDM with N-QAM. An<br>
example of 64-QAM @ 47.4 kbps.system has a data rate of 100 bit/second wit=
h<br>
a 300 Hz channel. This system would have a data rate of up to 47 400<br>
bits/second with a 10 kHz channel.<br>
<br>
A transmitter site in France is mentioned in the report: Pointe de Corsen<=
br>
coordinates: 48.414444 N, 4.794444 W. Google Earth shows some sort of<br>
installation there.<br>
<br>
73 Terry GW0EZY</p>
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