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Category: Ham Satellite news
Här finner du nyheter om amatörradiosatelliter från hela världen.
Varios ham radio satellites news.
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38k4-tester på AO-51
Nu p onsdag 22/9 krs 38k4-tester p AO-51 enligt nedanstende:
Experimenters Wednesday for 22 September
Start: 22 Sep at 0145 utc
End: 23 Sep at 0245 utc
38k4 BBS mode. We will open the BBS up for user testing with the 38k4 downlink. The uplink will be at 9k6.
Uplink: 145.860 FM, 9k6 Digital, Pacsat Broadcast Protocol (PBP)
Downlink: 435.150 FM, 38k4 Digital, PBP, 1 watt output
Klla: AMSAT-NA
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AO-51 Echo update
Lite nyheter om Echo AO-51, bla. dags fr PSK-tester:
The Mode L/S Experimenters Wednesday was a success. Reports from a number of amateur stations indicate that good signals were copied from the S Band transmitter. The data from Echo shows that the satellite worked fine and there was enough power to sustain Echo through Eclipse.
Until next Experimenters Wednesday we plan to run Echo with the FM repeater ON and the BBS OFF. During this time, command stations will work on the satellites solar panel power output.
Next Experimenters Wednesday, 8 September, we plan to run a PSK31 test. The satellite will be configured to receive on 28.140 mhz (10 meters) in USB mode and transmit on 435.300 mhz in FM mode. Only PSK31 mode may be operated during this test. I personally am not setup for this mode, so I would appreciate reports of how well (or not well) this mode worked sent to the amsat-bb.
You can check:
http://www.amsat.org/amsat-new/echo/
for the most up to date scheduling for Echo. I will post any changes to the schedule on this Web page. If the 435.150 mhz transmitter is ON then status info is sent in the PBP Broadcast message as well.
[ANS thanks the Echo Command Team for the above info]
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AO-40 baninfo
Peter Guelzow, DB2OS, reports that Victor Kudielka, OE1VKW did an analysis some weeks ago and was the first to discover some odd changes in the Mean Motion of AO-40.
It appears that the eccentricity may have changed, but it is also influenced by other effects and can not be used alone to evaluate possible changes in AO-40 s orbit. Viktor has some expanded diagrams of mean motion and eccentricity, as well as for the heights of peri- and apogee and their velocities on his home page:
http://cacofonix.nt.tuwien.ac.at/~oe1vkw/ao40/2004.html
Viktor noted, I am unable to judge which points are just imprecise measurements and what are the influences of data smoothing or other manipulations. The only big enough effect is the change in mean motion Peter continues, If you look carefully on the data, you will see that the orbit change already happened *before* the sudden battery event. We can only speculate, that it is the battery. It could be indeed also some remaining fuel? Peter added. The thrust phase is also much longer than the battery event, not only a few hours or days. Perhaps,could be smoothing/manipulation of the NORAD data too. There is room for a lot of speculation.
Peter concluded, Assuming the S/C mass to be 400kg, than this change is due to an impulse of 40 kg m/s or equal to 5 minutes of hot Arcjet firing.I have no idea if the battery is capable to do this. Indeed, if it is shortened it will get glowing hot and vent everything.
[ANS thanks Peter, DB2OS for the above information]
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AO-51 i mode L/S
The ARISS program is pleased to announce that the amateur radio equipment aboard the International Space Station is now operating in cross-band repeat mode.
We realize that many of you will miss the packetmode
However, cross-band repeat allows further experimentation of the ISS amateur radio system.
The downlink for this operating mode remains the same, so listen for the station on 145.800 MHz.
The new uplink frequency is 437.800 MHz. All frequencies are subject to Doppler shifting.
ARISS is an international educational outreach program with US participation from NASA, AMSAT and the American Radio Relay League.
ARISS offers an opportunity for students to experience the excitement of Amateur Radio by talking directly with
crewmembers on-board the International Space Station.
Teachers, parents and communities experience, first hand, how Amateur Radio and crewmembers on ISS can energize youngsters interest in science, technology, and learning.
Further information on the ARISS programme is available on the website http://www.rac.ca/ariss .
Thank you & 73,Scott H. Stevens, N3ASA
Frank H. Bauer, KA3HDO
Klla: amsat