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Ham Satellite news

HamSatDroid – Spårningsprogram för Android

Nu finns en ny version av HamSatDroid som är ett spårningsprogram för Android:

Dave Johnson, G4DPZ announced a new version of the free HamSatDroid
app now available on the Android Market.

Upates to the app include:

+ tracking algorithm uses Dave’s SGP4 implementation, as GENSO.
+ plot three orbits ahead on the map
+ plot the footprint
+ take keps from Celestrak

Dave says, “Thanks to the feedback we’ve had from the existing
users, I’ve got quite a few more changes in development. Opinions
are sought about making a small charge and paying the income into
satellite building funds and supporting a server which might be
introduced to improve functionality of the app.”

See the HamSatDroid web page at:
https://sites.google.com/site/hamsatdroid/

Dave is the FUNcube Data Warehouse Developer and is also an AMSAT-NA
Life Member and AMSAT-UK Committee Member.

Categories
Ham Satellite news

AMSAT-UK 80m även på nätet

The AMSAT-UK 80m net is held every Sunday morning at 10am local time on a nominal frequency of 3.780 MHz (+/- QRM).

A YouTube clip of the net can be seen at
http://www.youtube.com/watch?v=UEhwOYOqjdo

An MP3 recording of the net can be heard at
http://www.ham-radio.ch/kits/sdr-radio.com/mp3/05-Feb-2012-1058%203.725MHz.mp3

You can listen to the Sunday AMSAT-UK net remotely using the web radio of Paul M0EYT in Poole, Dorset, UK via the Web Servers (Free) page at http://www.sdr-radio.com/

73 Trevor M5AKA
AMSAT-UK: http://www.uk.amsat.org/

Categories
Ham Satellite news

SumbandilaSat SO-67 Amateur Transponder Recovery Work in Progress

It would appear that prior reports on the demise of South Africa’s
SumbandilaSat were ‘greatly exagerated’ (with apologies to author Mark
Twain).

A report on the Southern African AMSAT website says partial recov- ery
is possible for Amateur Radio Operation to possibly resume in March
2012.

“We have not given up on our efforts to get SumbandilaSat working again
even if it is only partially”, said Johan Lochner ZR1CBC who is spending
much time on the recovery process and many nights burn- ing the midnight
oil working on new and more intelligent algorithms.
He and his colleagues are making every effort to get the satellite
working again.

SumbandilaSat experienced a corruption in the programme memory of one of
the power switches. This is the interface unit which con- trols a robust
orientation control implementation system which is using output from the
magnetic sensors to point the solar panels to- wards the sun in a safe
mode scenario when for example communica- tions with the ground segment
was not possible for a few days.

The corruption of the program memory prevented the magnetic inter- face
unit from automatically switching on after power-up and thus
preventing access to measurements taken by the magnetometer.

Johann said, “As a result of the malfunction of the magnetic control
unit the satellite started to slowly point away from the sun with
intermittent sun eclipses. When there was no power flowing from the
solar cells the batteries drained and we could not in a safe way
communicate with the satellite, so we backed off. Once we determined
this pattern we  stopped communicating with the satellite when we did
not see sufficient charge on the batteries. At other times we had good
communication when could diagnose what was going on. Dur- ing good
communication windows that could last 2 or 3 days we tried to diagnose
the exact nature of the problem in the same way as we had done before
and we started to implement a fix. The particular power switch that
failed was already the redundant one so we were in a worse state than
before.”

SumbandilaSat controllers implemented automated ground segment soft-
ware to make contact with the satellite from both SANSA Space Opera-
tions and the Electronic Systems labs at SU. The objective was to
contact the satellite automatically and to try to implement the recovery
procedure and also notify the team if any contact was made.

Johann continued, “By mid-November 2011 we again made contact with
SumbandilaSat and set in place a planned recovery procedure. Within
3-4 days we came to the conclusion that the main battery had failed.
Earlier the intermittent contact was because the battery could not be
fully charged and that satellite power bus was too low for the
processors and transmitter to function. We surmised that during the
month that we had no contact that the battery must have gone open
circuit. With the battery no longer on the power bus, the voltage on the
bus would rise to 28.5 volts and supply enough current to support
operations when SumbandilaSat was in full sunlight.”

The SumbandilaSat concludes, “We are determined to get this working and
to maintain the scientific value of the satellite as much as possible.
Johann’s focus is now on getting the amateur radio trans- ponder
working, which with the loss of AO-51 will be a great asset to amateur
radio satellite activity. By the end of February we hope to achieve
this!”

Uplink:   145.875 MHz (no tone required)
Downlink: 435.345 MHz

See: http://www.amsatsa.org.za/SumbandilaSat.htm for full coverage of
this news.

Categories
Ham Satellite news

FOX-1

Amsat NA har nu säkrat en uppskjutning åt sin nya satellit FOX-1.

Följande finns att läsa i nedanstående nyhetsbrev.

Project ELaNa, NASA’s “Educational Launch of NanoSat” managed by the
Launch Services Program at the Kennedy Space Center, announced on
February 10 that the AMSAT Fox-1 cubesat has been selected to join
the program.

NASA will work with AMSAT in a collaborative agreement where NASA
will cover the integration and launch costs of satellites deemed to
have merit in support of their strategic and educational goals.

Watch for full details to be published in the AMSAT Journal.

AMSAT teamed with the ARRL to write and deliver the 159 page educa-
tional proposal to NASA. Letters documenting the importance of AMSAT’s
satellites in the education programs at the ARRL and also at the Clay
Center for Science and Technology at the Dexter and Southfield schools
in Brookline, MA, were important parts of our proposal.

AMSAT President Barry Baines, WD4ASW said, “The ELaNA Launch oppor-
tunity marks AMSAT’s return to space after the conclusion of the
successful ARISSat-1/KEDR flight. We need to get the flight Fox-1,
along with an operational flight backup satellite, built, integrat-
ed, tested, and delivered. Our ability to provide a spacecraft and
get it launched is dependent upon the active support of our donors
who wish to see Fox-1 fly.”

AMSAT Vice-President of Engineering, Tony Monteiro, AA2TX noted this
will provide a launch opportunity for AMSAT’s next generation of FM
repeater satellites with features and operation beyond the experience
of AO-51. AMSAT’s Fox-1 Engineering Team is making progress developing
the advanced satellite that will provide these features:

+ Fox-1 is designed to operate in sunlight without batteries once
   the battery system fails. This applies lessons learned from AO-51
   and ARISSat-1 operations.

+ In case of IHU failure Fox-1 will continue to operate its FM
   repeater in a basic, ‘zombie sat’ mode, so that the repeater
   remains on-the-air.

+ Fox-1 is designed as the immediate replacement for AO-51. Its U/V
   (Mode B) transponder will make it even easier to work with modest
   equipment.

+ From the ground user’s perspective, the same FM amateur radio
   equipment used for AO-51 may be used for Fox-1.

+ Extending the design, Fox-2 will benefit from the development work
   of Fox-1 by adding more sophisticated power management and Software
   Defined Transponder (SDX) communications systems.

The Fox-1 Project presents an opportunity to literally put your call-
sign on the Fox hardware. AMSAT is looking for major donations to help
underwrite the cost of solar cells/panels, one of the more significant
expenses of the project.

These solar cells are needed for the flight unit as well as for the a
flight spare. As Fox-1 will have solar cells on all six sides of the
spacecraft and given the relatively small surface area available on
each side (at most 4″ by 4″ per side), AMSAT needs to invest in high
efficiency solar cells to gain as much power as possible to operate
the spacecraft.

Several opportunities to make your donation to keep amateur radio in
space include:

+ Return the form sent with the letter to reply with your donation
  for the Fox-1 Project.
  – All donations over $40 will receive a Fox pin.
  – Donations of $120 or more qualify you for AMSAT President’s Club

+ Call Martha at the AMSAT Office +1-888-FB AMSAT (1-888-322-6728)
+ Paypal donation widget on the main page at: http://www.amsat.org
+ Paypal donation widget for Project Fox at:
   http://www.amsat.org/amsat-new/fox/
+ You can also go to the Paypal site and send your donation to
  martha@amsat.org.
+ The AMSAT Store: http://www.amsat-na.com/store/categories.php

Project Fox web site provide a good overview of the technical progress
of the new satellite: http://www.amsat.org/amsat-new/fox/

Categories
Ham Satellite news

ESA

Nu närmar det sig för uppskjutning av Vega.  Datum satt till 13/2

ESA’s new, small launcher will carry nine satellites into orbit on its very first flight: Italian space agency’s LARES and ALMASat-1 with seven CubeSats from European universities.

http://www.esa.int/SPECIALS/Vega/

Categories
Ham Satellite news

CHIBIS-M

Vid nästa besök på ISS kommer en Rysk minisatellit att vara med för att därefter sändas ut i rymden.

Datum är satt till  25/26 Januari.

Något som verkar rätt intressant är att (om jag förstått rätt) så ska satelliten placeras i en banhöjd på 500 km efter att lasten har lämnats av vid ISS som ligger runt 400 km.  Det verkar som att Progress M-13M ska användas för att få upp den till rätt bana.

För att läsa mer om satelliten.

http://www.energia.ru/en/iss/researches/geophis/19.html

http://www.uk.amsat.org/3910