Lite nyhetstorka just nu vad gller amatrradiosatelliter, men ARRL har skrivit en artikel om hur man kr repeatern p ISS.
Finns p:
http://www.arrl.org/news/features/2004/10/06/1/?nc=1
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Klla: ARRL
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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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Aktuellt schema för AO-51
Fljande schema gller numera fr Echo under resten av september och hela oktober:
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Update 27 Sept — Schedule and Info
Echo Schedule for October listed below.
FM Repeat and 9k6 BBS Open — 27 Sept thru 28 Sept
FM repeat mode OPEN
Uplink 145.920 FM with 67 hz tone
Downlink 435.300 FM
FM 9k6 BBS mode OPEN for user activity, uploading of messages and small to
moderate filesize pictures is OK
FM 9k6 BBS mode OPEN
Uplink 145.860 FM 9k6 digital, PBP
Downlink 435.150 FM 9k6 digital, PBP
Experimenters Wednesday for 29 September
PSK31 Test (Round 2)
Uplink: 28.140 USB PSK31 ONLY
Downlink: 435.300 FM, 1 watt output
October 2004 AO-51 (Amsat Echo) Schedule
Updated 27 Sep 2004
Sep 30
FM Repeater, V/U, High Power Mode ON
9k6 Digital, V/U, PBP BBS OFF, TXA OFF
Oct 6 Experimenters Wednesday
38k4 Digital Downlink, V/U, PBP BBS OPEN for Users
FM Repeater OFF, TXB OFF
Oct 7
FM Repeater, V/U, ON
9k6 Digital, V/U, PBP BBS, OPEN for Users
Oct 13 Experimenters Wednesday
No Mode Change Scheduled, Continue current Mode
Oct 14
FM Repeater, V/U, ON
9k6 Digital, V/U, PBP BBS, OPEN for Users
Oct 20 Experimenters Wednesday
FM Repeater, L/U, ON, Output Power TBD
9k6 Digital, V/U, PBP BBS OFF, TXA OFF
Oct 21
FM Repeater, L/S, ON
9k6 Digital, V/U, PBP BBS OFF, TXA OFF
Oct 27 Experimenters Wednesday
TBD, Check back later for Planned Mode
Klla: AMSAT-NA
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Billiga rotorer för AZ/EL
PA1GYS har byggt ngra enkla och billiga rotorer bestende av gamla TV parabol delar.
Klla: www
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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]
Klla:
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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]
Klla: ANS