ARLA/CLUSTER: ISS...

Quinta-Feira, 28 de Junho de 2007 - 21:47:03 WEST

Freitas,

Um abraço,

Estão ainda desenvolver e testar o protótipo do novo transponder (digital) de tecnologia SDR, que mais tarde fará parte do satélite EAGLE.

É um sistema de tecnologia, igual ao que a AMSAT-CT (AMRAD) está a estudar aplicando o DSP, e que tem por fim criar um novo modelo, para aplicar no projecto do satélite CamõeSat-1. Este sistema modular de FI, será integrado com diferentes up e down converters, que irão substituir os actuais 3 transponderes lineares que desenvolvemos e temos a funcionar, de 1296-435 (2 W); 145-435 (12 W ou 80 W) e 435-145 (8 W).

Conforme falámos há tempos, um destes transponders lineares, irá ser lançado num balão SimSat, possivelmente o mais pequeno de 1.2 GHz.

Este transponder de SDR, é um trabalho realizado pelo CS5CEP, do Centro Espacial Português, sedeado no IST-Tagus, no Parque de Ciência e Tecnologia de Oeiras, fundado pela AMRAD (AMSAT-CT) e o IST em 2005.

73, Mariano  

  ----- Original Message ----- 
  From: CT1FZC - Carlos Freitas 
  To: Francisco Costa, CT1EAT ; Resumo Noticioso Electrónico ARLA 
  Sent: Thursday, June 28, 2007 9:21 PM
  Subject: Re: ARLA/CLUSTER: ISS...

  Francisco Costa Boas!!

  Terás alguma informação para quando o satélite P3-Express estará operacional?
  http://www.amsat.org/amsat-new/express/

  Um abraço...
  73, CT1FZC
  Freitas

  2007/6/28, Francisco Costa, CT1EAT <listas_ct1eat  sapo.pt>: 
    Olá Salomão

    > Algum dos Colegas tem escutado as frequências de "downlink" da ISS?

    Para saber o "status" actual das actividades da ISS,
    veja esta página: http://www.issfanclub.com/ no lado direito.

    > A razão de ser das mesmas é a seguinte, desde sempre que conseguia escutar 
    > o
    > beacon de APRS da Estação, mas de há alguns meses a esta parte e mesmo com
    > órbitas muito favoráveis, não consigo obter nenhum sinal.

    O problema não é seu, mas do rádio da ISS que está desconfigurado, 
    e ainda não foi possivel repor a configuração.
    Para mais info, leia o report do Frank Baur.

    73 F.Costa, CT1EAT
    www.qsl.net/ct1eat

    ----- Original Message ----- 
    From: "Frank H. Bauer" <ka3hdo  comcast.net>
    To: <sarex  AMSAT.Org>
    Sent: Wednesday, April 25, 2007 2:45 AM
    Subject: [sarex] ARISS Status Report April 24, 2007 

    > ISS Ham Radio Enthusiasts,
    >
    > I wanted to provide a progress report on the ISS Ham Radio activities.
    > And
    > to address some questions that have come up related to ARISS operations 
    > and
    > equipment upgrade and repair.
    >
    > With the successful Shuttle return to flight, the International Space
    > Station Program construction has moved into high gear with delivery and
    > assembly of new ISS modules.  If all goes well, the new European Columbus 
    > Module and Japanese Kibo module will be installed on ISS in the next 12
    > months.  This substantial workload on the crew is impacting ARISS
    > operations directly.
    >
    > The launching of any new or replacement radios or computers has been 
    > significantly curtailed due to the extremely limited upmass
    > capability.  There are just too many higher priority activities from an
    > international space agency perspective and frankly we are a lower 
    > priority.  The extra workload on the crew has taken its toll on ARISS -
    > they have had very little extra time for Amateur Radio activities beyond
    > school contacts.  This is somewhat frustrating to the general ham radio 
    > community and the ARISS International Team, though the team is pleased
    > that
    > the crew has been able to speak so often with youth groups worldwide,
    > piquing their interest in Amateur Radio, science, technology, engineering 
    > and math.
    >
    > The ARISS team had been hopeful that Charles Simonyi would have been able
    > to restore the Kenwood D700 radio system to full functionality after an
    > accidental reprogramming of the radio occurred near the end of Exp 13. 
    > The
    > ARISS team worked diligently with the Simonyi team to get Charles
    > licensed,  trained, and prepared to perform the Kenwood
    > reprogramming.  Unfortunately, the ARISS team hit a major hurdle a few 
    > weeks before Charles' launch.  We learned that additional software
    > certification steps were required to allow the reprogramming software to
    > be
    > used on the ISS computers.  Through heroic efforts by the team, final 
    > software certification was successfully completed.  Unfortunately, this
    > was
    > completed only a few days before Charles' return from space.  As a result,
    > the ARISS team was informed by the mission control team and some of our 
    > international team partners that it there was insufficient time to allow
    > Charles to complete the restoration.  Thus, the Kenwood restoration was
    > not
    > completed by Charles.  This last minute hiccup in software certification 
    > was not predictable.  So there was no way the ARISS team could have better
    > prepared for Charles' flight.
    >
    > At this point in time, it appears that a full restoration will require a
    > substantial, concerted effort with full cooperation from our international 
    > colleagues and the Russian and US space agencies.  We need to make sure
    > that all components necessary for a successful reprogramming are
    > identified, purchased (if necessary), certified, tested and flown together 
    > before the radio will be fully restored. Realizing this will be especially
    > challenging due to the upmass issue I described above.  This will likely
    > take several months to accomplish as the team will have to begin from 
    > square one. In the short term, requests for some investigative analysis by
    > the crew will be made.  This will enable the ARISS team to determine if
    > the
    > radio can be partially restored to provide some of the unattended 
    > operations that it once provided.
    >
    > With Charles' successful landing, we have started down this new path.  We
    > will continue to keep you informed of our progress.
    >
    > In closing, we are aggressively working this issue, despite several 
    > setbacks.  While our plans to have Charles reprogram the radio were
    > thwarted, we were happy that he could speak to so many hams around the
    > world during his short stay.  And capture the imagination of students 
    > around the globe.
    >
    > On behalf of the ARISS team, we thank all of you for your interest and
    > enthusiasm in Ham Radio on the ISS.
    >
    > 73,  Frank H. Bauer, KA3HDO
    > ARISS International Chairman 
    > AMSAT-NA V.P. for Human Spaceflight Programs

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  -- 
  Carlos Freitas
  CT1FZC 

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