AMSAT-SM - Official Website of AMSAT-SM SwedenWebmaster and member of the AMSAT-SM steering group.
Idag är det 40 år sedan amatörradiosatelliten Oscar 7 kom upp. Och… den fungerar fortfarande!
AMSAT-UK har skrivit en bra artikel om AO-7:
http://amsat-uk.org/2014/10/31/special-event-station-for-40th-anniversary-of-oscar-7-launch/
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Jag har gjort en jämförelse mellan mina två antenninstallationer på ett par satellitpassager. Testet består av lyssningsjämförelser och är helt ovetenskaplig – inga mätinstrument har använts utan enbart en kontroll av signalvärdet mellan de två installationerna. Jag var helt enkelt nyfiken på vad skillnaden är mellan två installationer i olika prisklasser.
Installation 1 – N9TAX Slim-Jim (lågbudget):
Antenn N9TAX VHF/UHF duoband Slim-Jim, LNA4ALL pre-amp, coax 21m HFX 50 1336 (dämpning 450 MHz 100m 22 dB), UHF (PL)-kontakter.
Installation 2 – 435 MHz 1/4λ GP (högre budget):
Antenn UHF 1/4λ GP, Mini-70 pre-amp (SHF-Elektronik), coax 21m RFC-400 low-loss (dämpning 450 MHz 100m 9 dB), N-kontakter.
Radio / Mjukvara:
Funcube Dongle Pro +, SDR-Radio v2, koaxomkopplare med N-kontakter för att skifta mellan antennerna.
Jämförelsetabell:
Tabellen nedan visar en passage med FO-29 och en med CO-58. Jag har lyssnat på satelliternas CW-beacon för att få en jämn signal. Kryss (X) i tabellen visar vilken antenn som har haft bäst signalstyrka vid en given elevation. Om båda antennerna har ett kryss har de haft ungefär samma signalstyrka. Utöver nedanstående har jag lyssnat på ett antal andra passager men dessa är inte dokumenterade.
Sammanfattning:
https://www.orbital.com/NewsInfo/release.asp?prid=1918
The GOMX-2 and RACE CubeSats were among more than 2 dozen satellites that were lost after an unmanned Orbital Space Sciences (OSC) Antares 130 vehicle exploded spectacularly shortly after launch at 2222 UTC on Tuesday, October 28, from the Mid-Atlantic Regional Spaceport on Wallops Island on Virginia’s Eastern Shore. Both satellite packages carried payloads that operated on Amateur Radio frequencies. The Antares is a new medium-class launch vehicle developed by OSC.
The rocket exploded about 6 seconds after launch, sending a huge ball of fire hurtling toward the ground, which set a massive fire at the NASA launchsite.
The Radiometer Atmospheric Cubesat Experiment (RACE) CubeSat was a joint project between The Texas Spacecraft Laboratory (TSL) at the University of Texas-Austin and NASA’s Jet Propulsion Laboratory (JPL). It carried a 183 GHz radiometer, a new science instrument designed by JPL. The primary objective of the RACE mission was to collect atmospheric water vapor measurements. The spacecraft was equipped to transmit using GMSK at 38.4 k and CW telemetry on a downlink frequency of 437.525MHz, as coordinated with the IARU. TSL’s Edgar Glenn Lightsey, KE5DDG, was listed in the IARU coordination documents as the responsible operator.
The Antares 130 launcher was on a resupply mission, carrying some 5000 pounds of cargo to the International Space Station. GOMX-2 and the other satellites onboard the rocket were to be launched into orbit from the International Space Station.
The Antares 130 also was carrying the Flock-1d array of 26 satellites as well as Arkyd-3, Cygnus CRS-3, and the RACE CubeSat
Teamet bakom Lituanica har nu meddelat att nästa satellit, LituanicaSAT-2, är på gång. LituanicaSAT-2 kommer att vara mer avancerad än LituanicaSAT-1 med bla. möjlighet att aktivt ändra bana med hjälp av hjälpmotorer/raketer. Därför beräknas den kunna vara i bana under ca. 18 månader. Läs mer:
The LituanicaSAT team has announced on Facebook that the
LituanicaSAT-2 CubeSat will be coming soon.
It is hoped the CubeSat will be among 50 satellites launched in the
1st quarter of 2016 on the Ukrainian Cyclone 4 launcher from the
Alcantara launch site built by Ukraine and Brazil. The new launch
site is located near the Atlantic coast of Brazil just 2.3 degrees
south of the equator.
LituanicaSAT-2 will be more complex than the first and will test a
new propulsion system which will enable it to change orbit.
Currently CubeSats deployed in very low Earth orbit may only last 3
months before burning up in the Earth’s atmosphere, the propulsion
system could extend that up to 18 months.
Read the 15min.lt article about LituanicaSAT-2 in Google English at
http://tinyurl.com/LituanicaSAT-2-15min
Facebook
https://www.facebook.com/Lituanicasat1
You can watch a presentation by Gintautas Sulskus on the first
LituanicaSAT CubeSat at
http://amsat-uk.org/colloquium/colloquium-2014/presentation-videos/
LituanicaSAT-1
http://amsat-uk.org/2014/02/27/lituanicasat-1-cubesat/
QB50 to use Alcantara launch site
http://amsat-uk.org/2014/01/28/qb50-cubesat-launch-contract-signed/
[ANS thanks AMSAT-UK for the above information]
4M moon mission är en satellit med destination månen och som även har amatörradio ombord. Den sänder runt 145.8795 MHz och använder WSJT. I Sverige har bla. SM7WSJ Håkan hört den. Mer information finns på följande sidor:
http://moon.luxspace.lu/flyby/#comments
DK3WN Satblog har mycket info:
