DomainKey-Signature: a=rsa-sha1; c=nofws; d=pobox.com; h=message-id:date
	:to:from:subject:mime-version:content-type
	:content-transfer-encoding; q=dns; s=sasl; b=ETVXeGrCSzmuNTdZ2xL
	BvlJQjB9WvAWZP+gGlddDhCe50dH3kiiKcHSJD/O/S4SoJ+0aglCHEnsEmFrGjIs
	ZS3MNsYVuGRR+AZT0X5wcdYJUOzNAQklyLg83cr/wgg/L6G3Ztd/esglI74i3qT2
	+DIfkV0fTmCF9XQp/Y+UNV9M=
Message-Id: <7.0.1.0.2.20110322211026.075e6de0@erols.com>
Date: Tue, 22 Mar 2011 21:32:14 -0400
To: rsgb_lf_group@blacksheep.org
From: Nan and Sandy Sanders <radiodog77@pobox.com>
Mime-Version: 1.0
DomainKey-Status: good  
Subject: LF: WRC-2012 to regulate down to 8.3 KHz ?
Content-Type: text/plain; charset="iso-8859-1"; format=flowed
Content-Transfer-Encoding: quoted-printable
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Hi all, I saw this the other day and thought it=20
would be of interest to the group.
      Sandy
     WB5MMB


UNITED STATES OF AMERICA
DRAFT PROPOSALS FOR THE WORK OF THE CONFERENCE
Agenda Item 1.16: to consider the needs of=20
passive systems for lightning detection in the
meteorological aids service, including the=20
possibility of an allocation in the frequency range
below 20 kHz, and to take appropriate action, in=20
accordance with Resolution 671 (WRC-07)
Background Information: Resolution 671 (WRC-07)=20
resolves to invite the ITU-R to conduct and
complete studies related to lightning detection=20
to enable a decision on an appropriate method for
providing recognition, including the possibility=20
of making an allocation, to the meteorological aids service
in the frequency range below 20 kHz.
The automated Arrival Time Difference (ATD)=20
system uses the time differences of signal
received to derive lightning strike locations.=20
Meteorological organizations analyze the data from
the ATD system and provide forecasts to assist=20
safety of life, public safety and aviation
operations. Recent ITU-R studies show the optimal=20
frequency for ATD measurements is around
9.76 kHz.
Recommendation ITU-R RS.[20 kHz ATD PROTECTION]=20
determined lightning detection systems are
optimized with a 3 kHz bandwidth signal from 8.3=20
- 11.3 kHz. Any interference in the lower portion, i.e.
8.3 - 9 kHz, would impact the whole system.=20
Therefore, it is important to protect the full range of the
signal to ensure that the systems will be able to=20
use their allocated band without interference.
Proposal:
41
ARTICLE 5    ( note from WB5MMB. where the=20
following shows 98.3 or 9 8.3 in the text the 9=20
had a strike mark through it that did not copy)
Frequency allocations
Section IV =96 Table of Frequency Allocations
(See No. 2.1)
MOD USA/1.16/1
98.3-110 kHz
Reasons: A primary allocation to the=20
meteorological aids service in 8.3-11.3 kHz will protect
the lightning detection systems from users=20
operating under No. 4.4. Interference in the lower
portion, i.e. 8.3-9 kHz, is expected to impact the whole system.
MOD USA/1.16/2
5.53 Administrations authorizing the use of=20
frequencies below 9 8.3 kHz shall ensure that
no harmful interference is caused thereby to the=20
services to which the bands above 98.3 kHz are
allocated.
Reasons: Consequential to the meteorological aids=20
service primary allocation in the 8.3-9 kHz
frequency band.
MOD USA/1.16/3
5.54 Administrations conducting scientific=20
research using frequencies below 9 8.3 kHz are
urged to advise other administrations that may be=20
concerned in order that such research may be
afforded all practicable protection from harmful interference.
Allocation to services
Region 1 Region 2 Region 3
Below 98.3 (Not allocated)
MOD 5.53 MOD 5.54
8.3-9 METEOROLOGICAL AIDS
ADD 5.C116
9-1411.3 METEOROLOGICAL AIDS
RADIONAVIGATION
ADD 5.C116
911.3-14 RADIONAVIGATION
=85.
42
Reasons: Consequential to the meteorological aids=20
service primary allocation in the 8.3-9 kHz
frequency band.
ADD USA/1.16/4
5.C116 Use of the band 8.3-11.3 kHz by the=20
meteorological aids service is limited to passive use.
In the 9-11.3 kHz band, meteorological aids=20
service stations shall not claim protection from stations of the
radionavigation service submitted for=20
notification to the Bureau prior to the [date of entry into force of
WRC-12 Final Acts]. For sharing between stations=20
of the meteorological aids service and stations in the
radionavigation service submitted after this date=20
the most recent version of Recommendation ITU-R
RS.[20 kHz ATD PROTECTION] should be applied.
Reasons: To protect passive lightning detection=20
systems below 20 kHz and support a meteorological aids
service allocation, limited to passive use, under=20
the condition that no undue constraints are placed on
existing services.
SUP USA/1.16/5
RESOLUTION 671 (WRC-07)
Recognition of systems in the meteorological aids service
in the frequency range below 20 kHz
Reasons: The ITU-R completed the required studies for this agenda item.