[W2CRA] Fw: ARLB008 Cooperative Effort Under Way to Resolve Potential 70-Centimeter Interference Issue
Tony Ploski
aploski at comcast.net
Thu Mar 25 13:02:58 EDT 2021
I remember that when PLRS was first being tested at a Marine base in CA,
they asked the hams to turn off the local 440 MHz repeaters because they
were interfering with the exercise. I believe this was the 1970s.
Tony W2HWW
On 3/25/2021 10:37 AM, Ken Brown wrote:
>
> 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
> <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-paws-sites/
> <https://ema.arrl.org/2007/09/23/arrl-continues-to-deal-with-dod-over-pave-paws-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>
> <w2cra-bounces at mailman.qth.net>
> <mailto:w2cra-bounces at mailman.qth.net> on behalf of Kurt Cathcart,
> KR2C <Kurt at KuhlRoad.net> <mailto: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>
> <w2cra at mailman.qth.net> <mailto: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 <memberlist at www.arrl.org>
> <mailto:memberlist at www.arrl.org>
> *Sent:* Wednesday, March 24, 2021 3:51 PM
> *To:* gknoedl at hotmail.com <mailto:gknoedl at hotmail.com>
> <gknoedl at hotmail.com> <mailto: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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