[W2CRA] Fw: ARLB008 Cooperative Effort Under Way to Resolve Potential 70-Centimeter Interference Issue
Ken Brown
W2KB at ARRL.net
Thu Mar 25 10:37:05 EDT 2021
And this:
"Feb1, 2017 420-450 MHz 1. Band Introduction The band 420-450 MHz is
used by the military and other Federal agencies for a number of important
radar applications, multi-function position-location communications systems,
space operations, space research, and test range telecommand and flight
termination systems making the band essential to national security. The band
420-450 MHz is used extensively by the military agencies for land-based,
shipborne, and airborne radar systems to perform important national security
functions. The physics of radio propagation make the band excellent for
long-range radar search and surveillance operations, and the associated
target tracking. The band is used for long-range search and surveillance
radars to detect and track ballistic missiles and aircraft, and to catalog
objects in space. The military agencies use the band 420-450 MHz for the
multi-function Position Location Reporting System (PLRS) and the modernized
Enhanced Position Location Reporting System (EPLRS). EPLRS is a data
communications network that enables the rapid determination of the locations
of all units in the network. EPLRS also has communications and navigational
capabilities in addition to the position location feature. The EPLRS and its
airborne version, the AEPLRS, are critical to the operations and safety of
our military forces. The band 448-450 MHz is used for important weather
observations using wind-profiler radars to detect wind speeds and crosswinds
to aid in weather forecasting and to provide flight planning and operational
information to aircraft. The band 420-450 MHz is used for command control
and flight termination functions at numerous missile and rocket launch and
test ranges."
https://www.ntia.doc.gov/files/ntia/publications/compendium/0420.00-0450.00_
01Feb17.pdf
---Ken Brown - W2KB
From: w2cra-bounces at mailman.qth.net <w2cra-bounces at mailman.qth.net> On
Behalf Of Kurt Cathcart
Sent: Thursday, March 25, 2021 10:10 AM
To: steve jordan <steve7343 at hotmail.com>; w2cra at mailman.qth.net
Subject: Re: [W2CRA] Fw: ARLB008 Cooperative Effort Under Way to Resolve
Potential 70-Centimeter Interference Issue
Read this for reference.
https://ema.arrl.org/2007/09/23/arrl-continues-to-deal-with-dod-over-pave-pa
ws-sites/
-Kurt, KR2C
On 3/25/2021 10:05 AM, steve jordan wrote:
How is it that ameture radio operators share 70cm with a federal military
facility? Seems a little like letting the fox into the hen house.
Get Outlook for iOS <https://aka.ms/o0ukef>
_____
From: w2cra-bounces at mailman.qth.net <mailto:w2cra-bounces at mailman.qth.net>
<mailto:w2cra-bounces at mailman.qth.net> <w2cra-bounces at mailman.qth.net> on
behalf of Kurt Cathcart, KR2C <mailto:Kurt at KuhlRoad.net>
<Kurt at KuhlRoad.net>
Sent: Thursday, March 25, 2021 7:40:27 AM
To: w2cra at mailman.qth.net <mailto:w2cra at mailman.qth.net>
<mailto:w2cra at mailman.qth.net> <w2cra at mailman.qth.net>
Subject: Re: [W2CRA] Fw: ARLB008 Cooperative Effort Under Way to Resolve
Potential 70-Centimeter Interference Issue
There was a similar case to this about 10 years ago up in Mass. The result
was that Amateurs lost their 70cm privileges for a certain parameter around
a military radar facility.
-Kurt, KR2C
On 3/24/2021 10:28 PM, George wrote:
de AC2NX
This looks like it could be a real headache. Let's hope this never happens
near us!
-- something to think about.
G.
_____
From: ARRL Web site <mailto:memberlist at www.arrl.org>
<memberlist at www.arrl.org>
Sent: Wednesday, March 24, 2021 3:51 PM
To: gknoedl at hotmail.com <mailto:gknoedl at hotmail.com>
<mailto:gknoedl at hotmail.com> <gknoedl at hotmail.com>
Subject: ARLB008 Cooperative Effort Under Way to Resolve Potential
70-Centimeter Interference Issue
SB QST @ ARL $ARLB008
ARLB008 Cooperative Effort Under Way to Resolve Potential
70-Centimeter Interference Issue
ZCZC AG08
QST de W1AW
ARRL Bulletin 8 ARLB008
>From ARRL Headquarters
Newington CT March 24, 2021
To all radio amateurs
SB QST ARL ARLB008
ARLB008 Cooperative Effort Under Way to Resolve Potential
70-Centimeter Interference Issue
ARRL, the FCC, and the US Department of Defense are cooperating in
an effort to eliminate the possibility of amateur radio interference
on 70 centimeters to critical systems at White Sands Missile Range
(WSMR) in New Mexico. The Defense Department's Regional Spectrum
Coordinator contacted the FCC in March, seeking information on whom
to contact regarding detected amateur transmissions it believed
could pose a threat to a critical WSMR system operating on 70
centimeters. The FCC, in turn, asked ARRL to be involved in the
discussion and any necessary remedial efforts. It is to be noted
that the Amateur Radio Service is a secondary service on the band.
Investigation revealed that the potential problem was not with
individual operators or repeaters, but with RF control links at 420
- 430 MHz used to establish a linked repeater system within New
Mexico. "Based on the investigation, and with the support of the
FCC, the owners of the RF control links being used in the 420 - 430
MHz portion of the amateur allocation within a certain proximity to
WSMR are being asked to re-coordinate the link frequency to a new
one above 430 MHz," explained ARRL Regulatory Information Manager
Dan Henderson, N1ND.
ARRL enlisted the assistance of the state's designated repeater
frequency coordinator for information on specific links in that part
of the band. New Mexico Repeater Frequency Coordinator Bill
Kauffman, W5YEJ, agreed to work with the control link operators to
find new frequencies that will meet the needs of the link operators.
"Time is a factor in this request," Henderson said. "The new systems
at WSMR are in advanced testing now and will become fully
operational by early summer 2021." The FCC-imposed deadline for the
affected control links to change frequencies is set for May 31,
2021.
"It appears a total of 32 control links will have to be addressed,"
Henderson said. ARRL has mailed letters to each of the RF control
link operators, based on the recordkeeping of the frequency
coordinator, to advise them of the DoD's request as the primary user
on the band. "Any links with the potential to affect the identified
systems at WSMR still in operation after May 31, 2021 will be
subject to action by the FCC."
Henderson said the changes should have no direct impact on the use
of any local repeater, but until all the affected RF control links
are transitioned to new frequencies, certain links may be
temporarily inoperative. Links unable to be relocated by May 31 will
have to be shut down until the situation can be resolved. ARRL will
be in contact with the FCC after the May 31 deadline to advise it of
the status of the remediation effort.
NNNN
/EX
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