[amsat-bb] Russian AIST 2D also in the 435 MHz band

[M5AKA]

There are a number of references to the 432-438 MHz SAR satellite allocation in QST. Below are a  couple of clips from ARRL news reports in 2002/3.

I understand there are several more high-power SAR satellites planning to use 432-438 MHz due for launch in the next few years. 

73 Trevor M5AKA
----
ITU 432-438 MHz Synthetic Aperture Radar Satellite P-Band allocation 

ARRL Bulletin 45  ARLB045 Newington CT  July 11, 2003 
The delegates also agreed to allowed a secondary allocation for satellite borne synthetic aperture radars at 70 cm

----

ARRL Letter 2002-10-11 
ARRL, IARU CONTINUE PUSH FOR LIMITS TO 70-CM SPACEBORNE RADARS

A just-completed draft revision to an International Telecommunication
Union (ITU) Recommendation could result in reining in the potential for
interference to amateur and other services from synthetic aperture radars
(SARs) on 70 cm. Agenda item 1.38 at World Radiocomunication Conference
2003 (WRC-03) will consider a request to allocate up to 6 MHz of spectrum
for SARs in the band 420 to 470 MHz to be operated by the Earth
Exploration Satellite Service (Active)--EESS-Active. At issue is whether
the EESS allocation could be established without interfering with
incumbent services, including radiolocation and amateur.

"ARRL and IARU (International Amateur Radio Union) will continue to oppose
SARs operating in the most active portions of the amateur 70-cm band,"
said ARRL Technical Specialist Walt Ireland, WB7CSL. The spaceborne SARs
would be used to measure soil moisture, tropical biomass and Antarctic ice
thickness, and to document geological history and climate change. EESS
proponents contend that the best center frequency to penetrate jungle or
forest canopies is 435 MHz.

"There is some hype starting up at this late date that gives the
impression that the sky is falling," Ireland said, referring to recent
reports in the Amateur Radio news media that, among other things,
incorrectly claim that EESS proponents are seeking "exclusive use" of 430
to 440 MHz and that the EESS issue is a new one.

While some occasional interference from SARs to amateur systems would
appear inevitable, Ireland said, efforts to minimize the impact of the
EESS (Active) operations have been under way for several years. "Although
the SAR interference criteria limitations in the revised Recommendation
SA.1260 automatically would eliminate three of the SARs, amateurs can
still expect to receive interference from some of the remaining SARs on a
limited basis if WRC-03 allocates frequency spectrum between 420 and 440
MHz to EESS (Active)," he continued, "especially if the allocation is made
primary." The revised draft would keep four of the proposed SARs and
eliminate those with peak radiated power levels from 400 W to 10 kW--that
is, average power levels above 25 W, he explained.

Work on the major rewrite to ITU Recommendation SA.1260, hammered out by
ITU-Radio Sector Working Party 7C over the last several years, wrapped up
October 4 following a weeklong meeting. The draft recommendation sets
interference criteria limitations for SARs to be operated by EESS (Active)
in the 70-cm Radiolocation and Amateur and Amateur-Satellite Services
band. Ireland represented the ARRL on the US Delegation to ITU-Radio
Sector WP 7C. Ken Pulfer, VE3PU, represented the IARU. For the past two
years, Pulfer has been chairing the drafting groups that worked on the
revision and brought it to its present status--along the way incorporating
protection for amateurs.

SARs and the Amateur Service can coexist at 430 to 440 MHz "by taking
appropriate technical and operational measures," the draft revision
states. The Amateur Service is primary at 430 to 440 MHz in Region 1 and
secondary in Regions 2 and 3, which includes the US.

"It should be remembered, however, that an ITU-R recommendation is just
that--a recommendation, not a regulatory instrument," Ireland cautioned.
He notes that 18 sharing or compatibility studies--in which the ARRL and
the IARU have actively participated--have been conducted during the past
seven years--eight of them completed in the past two years.

During the Conference Preparatory Meeting next month as well as at WRC-03
next June in Geneva, the ARRL has pledged to maintain its stance against
egregious interference from SARs to Amateur Radio. The US also has
expressed opposition to SARs that could interfere with its radiolocation
systems in the band.

Earlier this year, the FCC's WRC-03 Advisory Committee and the National
Telecommunications and Information Administration's Radiocommunications
Conference Subcommittee recommended no change to the Table of Allocations
in the band 420 to 470 MHz as the US position. Both panels determined that
SAR transmissions could periodically impact amateur reception and even
held "the potential for significant interference."

----
 

    On Friday, 29 April 2016, 15:15, M5AKA via AMSAT-BB <amsat-bb at amsat.org> wrote:
 

 The ITU assigned 432-438 MHz to satellites using Synthetic Aperture Radar some 13+ years. 

While the article says the equipment is capable of transmitting a bandwidth of up to 30 MHz it doesn't necessarily mean it will use that bandwidth. 

I'd have thought a 6 MHz bandwidth transmission from 432-438 was more likely.
73 Trevor M5AKA


 

    On Friday, 29 April 2016, 14:30, Blinov Igor <rw3xl at ya.ru> wrote:
 

 Journalists fairytale, I think.

29.04.2016, 16:06, "Nico Janssen" <hamsat at xs4all.nl>:
> All,
>
> Together with RS 48 (SamSat 218D), also the Russian scientific satellite
> AIST 2D (41465, 2016-026B) was launched. One of the experiments on
> board is the P-band radar BiRLK, that can transmit 200 W pulses in the
> 435 MHz band with a bandwidth of 1 - 30 MHz.
>
> For further information on AIST 2D see:
> http://spaceflight101.com/soyuz-lomonosov/aist-2d/
>
> 73,
> Nico PA0DLO
>
> _______________________________________________
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-- 
С уважением, Игорь, RW3XL
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_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb