[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][JAMSAT Home]

[jamsat-news:3038] ANS-004 ANS Special Bulletin ARISSat-1/KEDR Goes Silent


SB SAT @ AMSAT $ANS-004.01
ANS-004 ANS Special Bulletin ARISSat-1/KEDR Goes Silent

AMSAT News Service Bulletin 004.01
January 4, 2012
BID: $ANS-004.01

Reception reports indicate that ARISSat-1/KEDR has stopped trans-
mitting on Wednesday, January 4, 2012. The last full telemetry 
captured and reported to the ARISSatTLM web site at 06:02:14 UTC 
on January 4 were received from ground stations as the satellite 
passed over Japan.

See: http://www.arissattlm.org/live (full telemetry display)
See: http://www.arissattlm.org/mobile (condensed telemetry)

Telemetry reports showed that the temperature aboard ARISSat-1/KEDR 
had been rising as atmospheric drag began to affect the satellite.
Final temperatures received via ARISSatTLM reported this data:

IHU           75  C / 167.0  F
PSU           76  C / 168.8  F
RF            88  C / 190.4  F
Control Panel 61  C / 141.8  F
Experiment    64  C / 147.2  F

Stations receiving telemetry from ARISSat-1 at any time over the 
last few months, please forward all of your .CSV telemetry files 
to telemetry AT arissattlm.org.

Konstantin, RN3ZF sent a reception report of his copy of the 0842 UTC 
pass that, "the telemetry was absent, voice messages were not legible, 
very silent and interrupted. Most likely, I saw last minutes in the 
life of the satellite."

Dee, NB2F reported, "Nothing heard from ARISSat-1/KEDR on any fre-
quency during the first USA pass at 16:00 UTC, January 4."

ARISSat-1/KEDR was deployed from the International Space Station on
August 3, 2011 during during EVA-29 on by Cosmonaut/Flight Engineers 
Sergei Volkov and Alexander Samokutyaev.

The satellite carried a student experiment from Kursk State University
in Russia which measured atmospheric density. Students from around the
world provided the voices for the FM voice announcements.

The amateur radio payload aboard ARISSat-1/KEDR achieved many "firsts"
for amateur radio in space:

+ First flight test of AMSAT Software Defined Transponder which trans-
  mitted simultaneous:
  - FM voice downlink cycling between student messages, spoken
    telemetry and SSTV from cameras on the spaceframe.

  - 16KHz bandwith linear transponder, 

  - CW beacon with telemetry and callsigns of radio amateurs noting
    their significant contributions to amateur radio in space.

  - Robust, forward error corrected 1K rate BPSK downlink with sat-
    ellite telemetry and Kursk experiment telemetry.

+ Development and release of the ARISSatTLM software for PC and Mac
  platforms enabled amateur stations worldwide with reliable reception
  of the BPSK telemetry, CW telemetry, display on the station's com-
  puter, and automatic upload of received data via the internet to the
  ARISSat engineering team.

+ A new Integrated Housekeeping Unit was developed and successfully

+ A new Power Management System was developed and successfully

AMSAT President Barry Baines, WD4ASW noted, ARISSat-1/KEDR marked a 
new type of satellite which has captured the attention of the national 
space agencies around the world for the unique educational opportunity 
we have been able to design, launch, and operate. By designing an edu-
cational mission aligned with NASA's Science, Technology, Engineering, 
and Mathematics goals amateur radio operators around the world have 
been able enjoy a new satellite in orbit."

ARISSat-1/KEDR Project Manager, Gould Smith, WA4SXM said, "Dozens of 
amateur radio volunteers, AMSAT, ARRL, NASA, and Energia teamed up for 
this successful mission to bring you the most unique and innovative 
amateur radio satellite mission. Congratulations to all who made 
ARISSat-1 successful!"

[ANS thanks the ARISSat-1/KEDR Team for the above information]


Via the ANS mailing list courtesy of AMSAT-NA