February 2009 - AMSAT-BB - mailman.amsat.org

Solar cell charging of Li ion.
by G0MRF＠aol.com 18 Feb '09

18 Feb '09

Hi. This is a bit 'geeky' but may be useful to any cubesat builders reading the BB. Freescale have a nice video on You Tube showing their new ultra low voltage DC-DC converters being used to charge a Lithium ion cell. >From a single solar cell with an onload voltage of just 349mV they are charging a lithium ion battery at 3.82V at 63mA with about 83% efficiency. _http://www.youtube.com/watch?v=7p9p2ySdcdM_ (http://www.youtube.com/watch?v=7p9p2ySdcdM) Sorry for the bandwidth. Geek time over. - This may be useful copied to the cubesat reflector. David G0MRF

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PRISM success Earth picture
by Mineo Wakita 18 Feb '09

18 Feb '09

Grand Station of Tokyo University have succeeded to take the Earth picture with Sub-camera, WAC (Wide Angle Camera). They have said as follows, Although it was liable to exposure exaggerated for a while, it was checked that WAC camera apparatus is functioning normally. We will be going to do adjustment of an exposure parameter from now on. Photography time : 12Feb2009 04:05:33UTC Photography place: Over Hokkaido in Japan http://www.space.t.u-tokyo.ac.jp/prism/img/PRISM_photo/PRISM_WAC_20090212_1… http://www.space.t.u-tokyo.ac.jp/prism/main-e.html http://www.space.t.u-tokyo.ac.jp/prism/about-e.html http://www.space.t.u-tokyo.ac.jp/prism/subsystem/O/index-e.html http://www.ne.jp/asahi/hamradio/je9pel/prismpic.htm JE9PEL, Mineo Wakita

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S band receiver neat pictures
by w7lrd＠comcast.net 18 Feb '09

18 Feb '09

Hello And I thought I had a pretty good S band receive system. http://wiki.gb.nrao.edu/bin/view/Electronics/Sbandpictures 73 Bob W7LRD

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clarification on my plans for FO-29
by Patrick STODDARD (WD9EWK/VA7EWK) 18 Feb '09

18 Feb '09

Hi! Sorry for the second message on this topic... I will try to be parked around 435.860 MHz USB +/- when I am on FO-29 over the next few days. Sorry for the confusion, and hope to hear you during the next few days. 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/

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WD9EWK on the road (18-23 February 2009)
by Patrick STODDARD (WD9EWK/VA7EWK) 18 Feb '09

18 Feb '09

Hi! I will be on the road for the next few days starting tomorrow (Wednesday, 18th) afternoon. I will visit friends in southern California and have an AMSAT table at the two-day Yuma (Arizona) hamfest on 20-21 February 2009. Over the next few days, including the two days at the hamfest, I hope to be on the FM satellites (AO-51, SO-50) as well as VO-52 andFO-29. For Wednesday evening, depending on how fast I can get on the highway away from Phoenix, I might be on the late-afternoon/early-evening AO-51 and SO-50 passes from DM22 or maybe on the DM22/DM32 boundary. I hope to be on various passes from somewhere in DM22 on Thursday (19th) before the hamfest, as well as from the hamfest (grid DM22qq) on Friday (20th) and Saturday (21st). On Sunday (22nd) and on my drive home on Monday (23rd), I should be able to work passes from DM22 and/or other nearby grids. In order to honor the request by Drew KO4MA regarding the second AO-51 repeater on 145.880/435.150 MHz FM for use by the K5D Desecheo Island DXpedition, I will stay on the primary 145.920/435.300 MHz FM repeater when I am on AO-51 over the next few days. When I am on VO-52, I will try to be around 145.910-145.915 MHz USB. For FO-29, I will try to be somewhere around 145.960 MHz USB +/-. During this trip, I will have access to Internet. I will try to post updates to my planned travels over the next few days. After I return home, I will print QSL cards and be happy to confirm contacts I make from wherever I operate from during this trip. As many of you may remember from my trips in 2008, I am happy to work as many stations as possible during the passes I work from other locations. It's fun to combine my travels with satellite operating. :-) 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/

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Disappointed
by Andrew Glasbrenner 17 Feb '09

17 Feb '09

I'm really disappointed in the fact that so many users are ignoring the request to leave the 435.150 downlink open for K5D while over Desecheo. It's really simple, if gridsquare FK68 is in the footprint there shouldn't be any QSOs or calls that don't involve K5D. Once FK68 is out of the footprint, it's QRP rules. If you are not sure when they are out of the footprint, then stand down for the entire pass or until you hear someone say they are out of the footprint. The consequences of even a few users ignoring this is that others will feel it is OK and pile on, and when K5D does show up they might just not even bother to try to break through the normal chaos. Satellite operators are considered by many to be the cream of the crop when it comes to ham radio. Let's live up to this and exercise a little self control and make this easy for both us and the DXpedition. 73, Drew KO4MA AMSAT-NA VP Operations

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New Indian Hamsat
by Rocky Jones 17 Feb '09

17 Feb '09

http://www.spacemart.com/reports/ISRO_To_Launch_A_Breakthrough_Satellite_99… Robert Oler WB5MZO Life member _________________________________________________________________ Windows Live™: E-mail. Chat. Share. Get more ways to connect. http://windowslive.com/explore?ocid=TXT_TAGLM_WL_t2_allup_explore_022009

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OMID
by PY2ZX 17 Feb '09

17 Feb '09

Hello Raul, Thanks for the information. I heard doppler signal on 465,005 MHz SSB during a bad OMID pass over my location at 2125 Z. Just a few seconds were listen as you see on the following files. http://archangelo.net/temp/OMID.jpg http://archangelo.net/temp/OMID_SSB.wav Flavio PY2ZX GG66nt very nice Copy 59 + 10 db only with dual band movil antenna opek uvs-325 ?? and 18 meter heliax 1/2 with my FT-847 sorry not video next pass Raul CA3SOC CHILE FF46rj

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W32A 4 Sale
by Sebastian 17 Feb '09

17 Feb '09

Have an Icom IC-W32A full duplex 2m/440MHz HT for sale. Please contact me OFF the list if you interested. 73 de W4AS Sebastian

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Re: Experience with AO-51 145.880 MHz uplink
by Harry Strahlendorf 17 Feb '09

17 Feb '09

Dear Ib, I hate to be a "party-pooper," but my understanding is that the 2nd repeater operating on AO-51 is reserved only for the K5D Desecheo Island Operation. Someone correct me if this is not the case. >From the main page of the AMSAT.org website, I read, "The second repeater on AO-51 will be activated on February 16 and reserved only for contacts with the K5D Desecheo Island 2009 DXpedition <http://www.kp5.us/> while the satellite is within range of the island." I've experienced some of the issues you raise when attempting to work AO-51 from the East Coast of the USA when operating V/U. We all need to be patient and respect one another's use of the satellite. So many of us just want to make that contact, and perhaps we are a bit hasty in pressing that transmit button when others are still in QSO. It is a thrill to know that we can communicate in this manner. Good luck with your operating through the birds! Sincerely, 73 Harry ~ KC2OJN

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