[amsat-bb] Arrow antenna reconfiguration results - UPDATE
Hi all, A quick update to my new project to improving the Arrow antenna, efficiency wise. I wanted to see how well it would perform on gaining and losing access during AOS and LOS. AO-27 is not a good choice since the timer is turned on when it is well above the AOS horizon and it is switched off before it reaches its LOS horizon. That leaves a dependable AO-51 to test it out. With the last setup, the OEM diplexer provided by Arrow Antenna, I would copy AO-51 about 3 minutes after AOS and lose it about 3 to 4 minutes before LOS. Not bad, but people were saying they worked the birds when they were 1 degree off of the horizon. I have some pine trees that could be an issue but they are spaced far enough apart that I can work between them and I also have to deal with the McCollough Range to the SSE of me here in Las Vegas, NV. Today, there were 2 passes of AO-51, one at 12 degrees elevation, the other at 74 degrees. During both passes, I began to copy the downlink about a 1.25 minute after AOS. A considerable difference from 3 minutes. The downlink also improved down to about minute before LOS. On the last pass I worked KG6NUB at 0124z and LOS was 0125z and my downlink sounded fairly good, though I was fighting desense. (That's another issue I need to resolve.) Also, on both passes, I never once lost the downlink. No dropouts or fades. I'm still amazed. Another issue I came across was how wide the beamwidth is of the Arrow Antenna between the Arrow diplexer and the new diplexer. I was wondering if this was going to happen and it did. The reason that this happened was with the old diplexer, the signal attenuated so much that you had to be pointed right smack dab on the bird, a few degrees off and you lost the signal. Now, with the new diplexer, you can point the beam in the general direction and still copy the bird. In most cases I had to turn the beam 90 degrees before I completely lost the downlink! Twisting the antenna to make polarization changes makes absolutely no difference now. This also attributes to the fact that now I'm copying the entire pass without dropouts or fades. Makes sense. What I've regained over the lossy diplexer makes up for any polarization differences, etc. for a better copiable signal. Next weekend I will have to try more passes and get a feel of how much this system has changed. 73, Jeff WB3JFS Las Vegas, NV DM26 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Antenna Polarization
- Original Message - From: Patrick Domack patric...@patrickdk.com To: amsat-bb@amsat.org Sent: Wednesday, September 23, 2009 4:11 AM Subject: [amsat-bb] Antenna Polarization I've been meaning to setup some antennas for satellite operation for awhile here. And since I will probably end up doing it this fall/winder I had a question I was wondering about, before I get the antennas completely built connected up. I plan on using a circular polarized antenna, for lhcr and rhcr. Since this setup has two coax that your switch a 1/4wave (if I remember right) to either side to create the two rotations in the antenna. Is there a way I can modify this to feed two radios? so one radio would receive lhcr, and the other rhcr? Or would I be forced to use two antennas to do this? The only idea I have is to use a signal splitter on each of the two antenna halfs before joining them, then join each of those splits into the cr parts. But I'm not sure if there is a better way to do this without as much loss, or if this might cause a backfeed that would defeat the me from getting any signal at all. Maybe there is a good writeup of this on the web somewhere, but I have no clue what the proper terms to google it are, and haven't had any luck. Thanks. Hi Patrick What you propose to do is possible in theory but you need four 3 dB power dividers with characteristic impedance of 36 ohm each and 14 N/m male connectors so that the total losses of the system are too high. I suggest to switch from RHCP to LHCP over the same receiver using only a coax relay as described in all antenna books of the ARRL or into The Satellite Experimenter's Handbook by Martin Davidoff K2UBC edited by the ARRL 73 de i8CVS Domenico ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: New Board
Clint, I've had the pleasure and privilege to personally meet all of the new board members except Bill at either Dayton or at the Symposium in San Francisco. In my opinion, all of them (including Bill), are super individuals. I am *very* pleased that they have volunteered their time and efforts on our behalf. My sincere thanks to each of them. 73, Steve N9IP -- Steve Belter s...@wintek.com -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Clint Bradford Sent: Friday, September 25, 2009 2:17 AM To: AMSAT BB Subject: [amsat-bb] New Board Didn't see much excitement about the recent election results here. But you should know we're in capable hands with the following board members in place: Barry Baines, WD4ASW Drew Glasbrenner, KO4MA Bill Ress, N6GHZ Alan Biddle, WA4SCA Tony Monteiro, AA2TX (first alternate) In my humble opinion, we're in good hands. These gentlemen should be commended for stepping up and committing themselves (well, committing could be interpreted as a psychiatric term ... ) to the cause of promoting AMSAT. Clint Bradford, K6LCS http://www.work-sat.com ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: New Board
Clint, As the FNG, I can say I have been awed by the old timers' dedication, experience, competence, and especially the just plain hard work which happens behind the scenes. We live in interesting times, in the sense of the Chinese curse, and I firmly believe that we as an organization will take advantage of that. The outlines of the future are at least becoming clearer, if not in all cases the details. See everybody at the symposium. Alan WA4SCA PS I asked, and they tell me I can't have a recount. ;) ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] SwissCube telemetry
All,
11:06 UTC CW and 1k2 BPSK active , 250 packets decoded
hb9eg/1
1 0 3
2 323 325
3 301001 37
Error flags:
EPS: OK
COM: OK
CDMS: OK
ADCS: OK
Payload:OK
Power states:
COM: On
Beacon: On
CDMS: Off
ADCS: Off
Payload:Off
ADS: Off
Battery 1 voltage: 4.12 V
Battery 2 voltage: 4.16 V
Produced current:
-X: [375;500[ mA
+X: [0;125[ mA
-Y: [125;250[ mA
+Y: [0;125[ mA
-Z: [0;125[ mA
+Z: [125;250[ mA
Battery 1 temperature: -4°C
1k2 packets e.g.:
2009-09-25 12:15:41.410 UTC: [72 Bytes KISS Frame (without CRC)]
ctrl: 3 PID: F0 {UI} 49 Payload Bytes
from HB9EG1-1 to HB9EG1:
1 08 8C 47 00 08 08 C0 BB 00 0D 10 01 01 00 02 E1 DE 00 18 08
21 C0 27 41 8E 08 08 C0 BD 00 0D 10 01 07 00 02 E1 DE 00 18 08
41 C0 27 8A 3A B0 00 2E 1D E8
__
2009-09-25 12:15:43.550 UTC: [274 Bytes KISS Frame (without CRC)]
ctrl: 3 PID: F0 {UI} 254 Payload Bytes
from HB9EG1-1 to HB9EG1:
1 38 8D 1A 00 08 08 C0 BC 00 EE 10 03 19 00 02 CC 04 00 62 FF
21 FE 05 FA FB 05 02 04 05 F8 02 05 00 00 0A 00 00 0B 07 09 08
41 FE 07 0A 02 01 0F 04 05 0F 0B 0C 09 03 0A 0E 03 03 11 08 09
61 13 0E 0F 0A 07 0D 12 05 05 14 0C 0E 17 10 11 0B 0C 10 14 07
81 06 16 0F 11 1A 12 12 0C 0F 12 16 09 08 18 11 14 1C 14 14 0D
101 11 13 18 0B 0B 17 0F 15 1B 12 13 0D 0F 12 16 0C 0C 15 0D 14
121 19 10 12 0D 0D 11 15 0D 0D 08 07 11 11 05 06 01 08 06 08 0C
141 0C FF 00 0A 07 FE FF F8 01 FF FF 0A 0A F8 F8 04 00 F8 F8 F2
161 FA F8 F8 08 08 F3 F3 FE FA F2 F3 EF F4 F3 F3 05 05 EE EE F9
181 F4 ED EE EB EE ED EE 02 02 E9 E8 F3 EF E9 EA E9 E9 E9 E9 00
201 00 E5 E4 EF EB E5 E5 E6 E5 E5 E5 FC FC ED E5 EC ED EC EE EF
221 E4 EB ED FC FC F5 EA EE F5 F3 F5 F8 E9 F2 F5 FC FC FC F0 F2
241 FA F9 FB 00 EE F8 FB B3 13 B0 00 2E 1D F1
See here: http://www.dk3wn.info/p/?p=8439
73, Mike
DK3WN
___
Sent via amsat...@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE
Jeff -- I really appreciate you doing this research for us. Two additional ideas come to mind: 1. Those of us with FT-817s could configure its two RF ports to use different bands and connect the rig directly to the beam's antenna connectors, bypassing the duplexer. For this purpose, higher-quality bnc terminated cable would be useful. 2. If I'm correct, your replacement duplexer is rather larger than the one it is replacing. It would be a great topic for a Journal article if someone with the necessary equipment and expertise were to design a replacement with less loss. 73, Bruce VE9QRP On Fri, Sep 25, 2009 at 6:10 AM, Jeff Yanko wb3...@cox.net wrote: Hi all, A quick update to my new project to improving the Arrow antenna, efficiency wise. I wanted to see how well it would perform on gaining and losing access during AOS and LOS. AO-27 is not a good choice since the timer is turned on when it is well above the AOS horizon and it is switched off before it reaches its LOS horizon. That leaves a dependable AO-51 to test it out. With the last setup, the OEM diplexer provided by Arrow Antenna, I would copy AO-51 about 3 minutes after AOS and lose it about 3 to 4 minutes before LOS. Not bad, but people were saying they worked the birds when they were 1 degree off of the horizon. I have some pine trees that could be an issue but they are spaced far enough apart that I can work between them and I also have to deal with the McCollough Range to the SSE of me here in Las Vegas, NV. Today, there were 2 passes of AO-51, one at 12 degrees elevation, the other at 74 degrees. During both passes, I began to copy the downlink about a 1.25 minute after AOS. A considerable difference from 3 minutes. The downlink also improved down to about minute before LOS. On the last pass I worked KG6NUB at 0124z and LOS was 0125z and my downlink sounded fairly good, though I was fighting desense. (That's another issue I need to resolve.) Also, on both passes, I never once lost the downlink. No dropouts or fades. I'm still amazed. Another issue I came across was how wide the beamwidth is of the Arrow Antenna between the Arrow diplexer and the new diplexer. I was wondering if this was going to happen and it did. The reason that this happened was with the old diplexer, the signal attenuated so much that you had to be pointed right smack dab on the bird, a few degrees off and you lost the signal. Now, with the new diplexer, you can point the beam in the general direction and still copy the bird. In most cases I had to turn the beam 90 degrees before I completely lost the downlink! Twisting the antenna to make polarization changes makes absolutely no difference now. This also attributes to the fact that now I'm copying the entire pass without dropouts or fades. Makes sense. What I've regained over the lossy diplexer makes up for any polarization differences, etc. for a better copiable signal. Next weekend I will have to try more passes and get a feel of how much this system has changed. 73, Jeff WB3JFS Las Vegas, NV DM26 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Only Two Weeks Away
The 2009 AMSAT Symposium and Annual Meeting is only two weeks away. If you haven't registered on-line, please do so as soon as possible. All the information can be found on our website. I need to give the hotel a count for attendees so that they can set up the meeting rooms. In addition, we need to give the caterer a count for dinner. It's our 40th Anniversary - that's something to celebrate! -- 73- Martha ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] All Satellites
Here's a list of all (known to me) satellites still in orbit with some designed in (but not necessarily operational) amateur band functionality. For those that think nothing has been happening recently, there have been 26 (so far) satellites launched this year, 13 in 2008 and 11 in 2007. Thats 50 birds in less than the past 3 years. Catalog Number Common Name International DesignatorComments 1293OSCAR 3 1965-016F 6236OSCAR 6 1972-082B 7530OSCAR 7 1974-089B 10703 OSCAR 8 1978-026B 14129 OSCAR 101983-058B 14781 OSCAR 11 (UoSAT 2) 1984-021B 16909 JAS 1 (FUJI 1) 1986-061B 20437 OSCAR 14 (UoSAT 3) 1990-005B 20438 OSCAR 15 (UoSAT 4) 1990-005C 20439 OSCAR 16 (PACSAT) 1990-005D 20440 OSCAR 17 (DOVE) 1990-005E 20441 OSCAR 18 (WEBERSAT) 1990-005F 20442 OSCAR 19 (LUSAT)1990-005G 20480 JAS 1B (FUJI 2) 1990-013C 21039 SL-12 R/B(1)1990-116B 21087 INFORMATOR 11991-006A 21089 COSMOS 2123 1991-007A 21575 OSCAR 22 (UoSAT 5) 1991-050B 22825 KITSAT B1993-061C 22826 POSAT 1 1993-061D 22828 ITAMSAT 1993-061F 22829 EYESAT A1993-061G 23439 RADIO ROSTO 1994-085A 24278 JAS 2 1996-046B 24305 UNAMSAT 1996-052B 25396 TMSAT 1998-043C 25397 TECHSAT 1B 1998-043D 25509 SEDSAT 11998-061B 25520 PAN SAT 1998-064B 25544 ISS (ZARYA) 1998-067A 25636 SUNSAT 1999-008C 25693 OSCAR 36 (UoSAT 12) 1999-021A 25756 KITSAT 31999-029A 26063 OPAL2000-004C 26545 SAUDISAT 1A 2000-057A 26548 TIUNGSAT 1 2000-057D 26609 AMSAT OSCAR 40 2000-072B 26931 PCSAT 2001-043C 26932 SAPPHIRE2001-043D 27605 RUBIN 2 2002-058A 27607 SAUDISAT 1C 2002-058C 27842 DTUSAT 2003-031C 27844 CUTE-1 2003-031E 27845 QUAKESAT2003-031F 27847 CANX-1 2003-031H 27848 CUBESAT XI-IV 2003-031J 27939 MOZHAYETS 4 2003-042A 28375 AMSAT ECHO 2004-025K 28650 HAMSAT 2005-017B 28890 BEIJING 1 (TSINGHUA)2005-043A 28891 TOPSAT 2005-043B 28892 UWE-1 2005-043C 28893 SINAH 1 2005-043D 28894 SSETI-EXPRESS 2005-043E 28895 CUBESAT XI-V2005-043F 28897 SSETI-EXPRESS DEB 2005-043H 28898 MOZ.5/SAFIR/RUBIN 5/SL-82005-043G 28941 CUTE 1.72006-005C 29252 GENESIS 1 2006-029A 29479 HINODE (SOLAR B)2006-041A 29655 GENESAT 2006-058C 29712 PEHUENSAT 1 2007-001D 31117 EGYPTSAT 1 2007-012A 31122 CSTB 1 2007-012F 31126 MAST2007-012K 31128 LIBERTAD 1 2007-012M 31129 CP3 2007-012N 31130 CAPE 1 2007-012P 31132 CP4 2007-012Q 31135 AGILE 2007-013A 31140 NFIRE 2007-014A 31789 GENESIS 2 2007-028A 32781 GIOVE-B 2008-020A 32783 CARTOSAT 2A 2008-021A 32784 CANX-6 2008-021B 32785 CUTE 1.7 AOD 22008-021C 32786 IMS-1 2008-021D 32787 COMPASS 1 2008-021E 32788 AAUSAT CUBESAT 22008-021F 32789 DELFI C32008-021G 32790 CANX-2 2008-021H 32791 SEEDS 2008-021J 32792 RUBIN 8/PSLV2008-021K 32794 AMOS 3 2008-022A 32953 YUBILEINY 2008-025A 33492 GOSAT (IBUKI) 2009-002A 33493 PRISM (HITOMI) 2009-002B 33494 SPRITE-SAT (RISING) 2009-002C 33495 KAGAYAKI2009-002D 33496 SOHLA-1 (MAIDO-1) 2009-002E 33498 STARS (KUKAI) 2009-002G 33499 KKS-1 (KISEKI) 2009-002H 33595 EXPRESS AM-44 2009-007A 34808 ANUSAT 2009-019B 34941 PROTOSTAR 2 2009-027A 35002 PHARMASAT 2009-028B 35003 HAWKSAT 1 2009-028C 35004 CP6 2009-028D 35005 AEROCUBE 3 2009-028E 35008 MERIDIAN 2 2009-029A 35690 DRAGONSAT 2009-038B 35693 ANDE POLLUX SPHERE 2009-038E 35694 ANDE CASTOR SPHERE 2009-038F 35866 OBJECT B2009-049B 35867 FREGAT/IRIS 2009-049C 35868 OBJECT D2009-049D 35869 OBJECT E2009-049E 35870 SUMBANDILA 2009-049F 35871 BLITS 2009-049G 35931 OCEANSAT 2 2009-051A 35932 OBJECT B2009-051B 35933 OBJECT C2009-051C 35934 OBJECT D2009-051D
[amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE
On Sep 25, 2009, at 7:53 AM, Bruce Robertson wrote: 2. If I'm correct, your replacement duplexer is rather larger than the one it is replacing. It would be a great topic for a Journal article if someone with the necessary equipment and expertise were to design a replacement with less loss. There is a diplexer that is easy to make and has good performance in this article: http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf As a bonus you get details on how to build your own handheld antenna for LEO Satellites. - Duffey ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
I wonder how many of those 50 are able to handle ham radio 2-way contacts ? K6YK On Fri, 25 Sep 2009 15:09:43 + Nigel Gunn G8IFF/W8IFF ni...@ngunn.net writes: Here's a list of all (known to me) satellites still in orbit with some designed in (but not necessarily operational) amateur band functionality. For those that think nothing has been happening recently, there have been 26 (so far) satellites launched this year, 13 in 2008 and 11 in 2007. Thats 50 birds in less than the past 3 years. Catalog NumberCommon NameInternational DesignatorComments 1293 OSCAR 3 1965-016F 6236 OSCAR 6 1972-082B 7530 OSCAR 7 1974-089B 10703 OSCAR 8 1978-026B 14129 OSCAR 10 1983-058B 14781 OSCAR 11 (UoSAT 2) 1984-021B 16909 JAS 1 (FUJI 1) 1986-061B 20437 OSCAR 14 (UoSAT 3) 1990-005B 20438 OSCAR 15 (UoSAT 4) 1990-005C 20439 OSCAR 16 (PACSAT) 1990-005D 20440 OSCAR 17 (DOVE) 1990-005E 20441 OSCAR 18 (WEBERSAT) 1990-005F 20442 OSCAR 19 (LUSAT) 1990-005G 20480 JAS 1B (FUJI 2) 1990-013C 21039 SL-12 R/B(1) 1990-116B 21087 INFORMATOR 1 1991-006A 21089 COSMOS 2123 1991-007A 21575 OSCAR 22 (UoSAT 5) 1991-050B 22825 KITSAT B 1993-061C 22826 POSAT 1 1993-061D 22828 ITAMSAT 1993-061F 22829 EYESAT A 1993-061G 23439 RADIO ROSTO 1994-085A 24278 JAS 2 1996-046B 24305 UNAMSAT 1996-052B 25396 TMSAT 1998-043C 25397 TECHSAT 1B 1998-043D 25509 SEDSAT 1 1998-061B 25520 PAN SAT 1998-064B 25544 ISS (ZARYA) 1998-067A 25636 SUNSAT 1999-008C 25693 OSCAR 36 (UoSAT 12) 1999-021A 25756 KITSAT 3 1999-029A 26063 OPAL 2000-004C 26545 SAUDISAT 1A 2000-057A 26548 TIUNGSAT 1 2000-057D 26609 AMSAT OSCAR 40 2000-072B 26931 PCSAT 2001-043C 26932 SAPPHIRE 2001-043D 27605 RUBIN 2 2002-058A 27607 SAUDISAT 1C 2002-058C 27842 DTUSAT 2003-031C 27844 CUTE-1 2003-031E 27845 QUAKESAT 2003-031F 27847 CANX-1 2003-031H 27848 CUBESAT XI-IV 2003-031J 27939 MOZHAYETS 4 2003-042A 28375 AMSAT ECHO 2004-025K 28650 HAMSAT 2005-017B 28890 BEIJING 1 (TSINGHUA) 2005-043A 28891 TOPSAT 2005-043B 28892 UWE-1 2005-043C 28893 SINAH 1 2005-043D 28894 SSETI-EXPRESS 2005-043E 28895 CUBESAT XI-V 2005-043F 28897 SSETI-EXPRESS DEB 2005-043H 28898 MOZ.5/SAFIR/RUBIN 5/SL-8 2005-043G 28941 CUTE 1.7 2006-005C 29252 GENESIS 1 2006-029A 29479 HINODE (SOLAR B) 2006-041A 29655 GENESAT 2006-058C 29712 PEHUENSAT 1 2007-001D 31117 EGYPTSAT 1 2007-012A 31122 CSTB 1 2007-012F 31126 MAST 2007-012K 31128 LIBERTAD 1 2007-012M 31129 CP3 2007-012N 31130 CAPE 1 2007-012P 31132 CP4 2007-012Q 31135 AGILE 2007-013A 31140 NFIRE 2007-014A 31789 GENESIS 2 2007-028A 32781 GIOVE-B 2008-020A 32783 CARTOSAT 2A 2008-021A 32784 CANX-6 2008-021B 32785 CUTE 1.7 AOD 2 2008-021C 32786 IMS-1 2008-021D 32787 COMPASS 1 2008-021E 32788 AAUSAT CUBESAT 2 2008-021F 32789 DELFI C3 2008-021G 32790 CANX-2 2008-021H 32791 SEEDS 2008-021J 32792 RUBIN 8/PSLV 2008-021K 32794
[amsat-bb] Re: All Satellites
I would trade everyone of them that launched in the last 3 years for the first five on the list being active ...OK we have 1 out of the first 5 but all five would be nice... BTW I am quite sure Oscar V is still in orbit...but without ANY solar cell ability...we wont be hearing from it againand it wasnt a transponder But I still have a tape of it...! BTW Xenia OH is a cool place...when I was TDY in Cleveland for a bit a friend who worked where I was flying has a farm there...he recently sold me some Silver Appleyard duck eggs to stock our pond... Robert WB5MZO Date: Fri, 25 Sep 2009 15:09:43 + From: ni...@ngunn.net To: amsat-bb@amsat.org Subject: [amsat-bb] All Satellites Here's a list of all (known to me) satellites still in orbit with some designed in (but not necessarily operational) amateur band functionality. For those that think nothing has been happening recently, there have been 26 (so far) satellites launched this year, 13 in 2008 and 11 in 2007. Thats 50 birds in less than the past 3 years. Catalog NumberCommon Name International DesignatorComments 1293 OSCAR 3 1965-016F 6236 OSCAR 6 1972-082B 7530 OSCAR 7 1974-089B 10703 OSCAR 8 1978-026B 14129 OSCAR 101983-058B 14781 OSCAR 11 (UoSAT 2) 1984-021B 16909 JAS 1 (FUJI 1) 1986-061B 20437 OSCAR 14 (UoSAT 3) 1990-005B 20438 OSCAR 15 (UoSAT 4) 1990-005C 20439 OSCAR 16 (PACSAT) 1990-005D 20440 OSCAR 17 (DOVE) 1990-005E 20441 OSCAR 18 (WEBERSAT) 1990-005F 20442 OSCAR 19 (LUSAT)1990-005G 20480 JAS 1B (FUJI 2) 1990-013C 21039 SL-12 R/B(1)1990-116B 21087 INFORMATOR 11991-006A 21089 COSMOS 2123 1991-007A 21575 OSCAR 22 (UoSAT 5) 1991-050B 22825 KITSAT B1993-061C 22826 POSAT 1 1993-061D 22828 ITAMSAT 1993-061F 22829 EYESAT A1993-061G 23439 RADIO ROSTO 1994-085A 24278 JAS 2 1996-046B 24305 UNAMSAT 1996-052B 25396 TMSAT 1998-043C 25397 TECHSAT 1B 1998-043D 25509 SEDSAT 11998-061B 25520 PAN SAT 1998-064B 25544 ISS (ZARYA) 1998-067A 25636 SUNSAT 1999-008C 25693 OSCAR 36 (UoSAT 12) 1999-021A 25756 KITSAT 31999-029A 26063 OPAL2000-004C 26545 SAUDISAT 1A 2000-057A 26548 TIUNGSAT 1 2000-057D 26609 AMSAT OSCAR 40 2000-072B 26931 PCSAT 2001-043C 26932 SAPPHIRE2001-043D 27605 RUBIN 2 2002-058A 27607 SAUDISAT 1C 2002-058C 27842 DTUSAT 2003-031C 27844 CUTE-1 2003-031E 27845 QUAKESAT2003-031F 27847 CANX-1 2003-031H 27848 CUBESAT XI-IV 2003-031J 27939 MOZHAYETS 4 2003-042A 28375 AMSAT ECHO 2004-025K 28650 HAMSAT 2005-017B 28890 BEIJING 1 (TSINGHUA)2005-043A 28891 TOPSAT 2005-043B 28892 UWE-1 2005-043C 28893 SINAH 1 2005-043D 28894 SSETI-EXPRESS 2005-043E 28895 CUBESAT XI-V2005-043F 28897 SSETI-EXPRESS DEB 2005-043H 28898 MOZ.5/SAFIR/RUBIN 5/SL-82005-043G 28941 CUTE 1.72006-005C 29252 GENESIS 1 2006-029A 29479 HINODE (SOLAR B)2006-041A 29655 GENESAT 2006-058C 29712 PEHUENSAT 1 2007-001D 31117 EGYPTSAT 1 2007-012A 31122 CSTB 1 2007-012F 31126 MAST2007-012K 31128 LIBERTAD 1 2007-012M 31129 CP3 2007-012N 31130 CAPE 1 2007-012P 31132 CP4 2007-012Q 31135 AGILE 2007-013A 31140 NFIRE 2007-014A 31789 GENESIS 2 2007-028A 32781 GIOVE-B 2008-020A 32783 CARTOSAT 2A 2008-021A 32784 CANX-6 2008-021B 32785 CUTE 1.7 AOD 22008-021C 32786 IMS-1 2008-021D 32787 COMPASS 1 2008-021E 32788 AAUSAT CUBESAT 22008-021F 32789 DELFI C32008-021G 32790 CANX-2 2008-021H 32791 SEEDS
[amsat-bb] Re: All Satellites
I don't see it that way. Every project is a set of people who have participated in what is at first something technical, then magical. I have never talked with someone who has worked on something going into space that hasn't set back at some point and marveled at it. How many folks have we all done demos for, and heard Wow..! ? With the technology to get things into some kind of orbit coming down, its only reasonable to expect that more and more organizations will make the attempt. Some will get amateur licenses just so they can to telemetry, but there is an interesting effect there, which is that some of them stick around and become hams, as oposed to just being licensed. I've met two people who were in some project and got licences, and once they attended a Dayton Hamvention, they were hooked. I've seen one of them several times now, at Dayton. So sure, we offer cheap telemetry but the side effects are priceless. --STeve Andre' wb8wsf en82 On Friday 25 September 2009 15:56:37 Rocky Jones wrote: The hamsat bands are slowly being converted into cheap telemetry bands... Robert WB5MZO To: ni...@ngunn.net Date: Fri, 25 Sep 2009 11:31:40 -0800 From: k...@juno.com CC: amsat-bb@amsat.org Subject: [amsat-bb] Re: All Satellites I wonder how many of those 50 are able to handle ham radio 2-way contacts ? K6YK On Fri, 25 Sep 2009 15:09:43 + Nigel Gunn G8IFF/W8IFF ni...@ngunn.net writes: Here's a list of all (known to me) satellites still in orbit with some designed in (but not necessarily operational) amateur band functionality. For those that think nothing has been happening recently, there have been 26 (so far) satellites launched this year, 13 in 2008 and 11 in 2007. Thats 50 birds in less than the past 3 years. Catalog NumberCommon NameInternational DesignatorComments 1293 OSCAR 3 1965-016F 6236 OSCAR 6 1972-082B 7530 OSCAR 7 1974-089B 10703 OSCAR 8 1978-026B 14129 OSCAR 10 1983-058B 14781 OSCAR 11 (UoSAT 2) 1984-021B 16909 JAS 1 (FUJI 1) 1986-061B 20437 OSCAR 14 (UoSAT 3) 1990-005B 20438 OSCAR 15 (UoSAT 4) 1990-005C 20439 OSCAR 16 (PACSAT) 1990-005D 20440 OSCAR 17 (DOVE) 1990-005E 20441 OSCAR 18 (WEBERSAT) 1990-005F 20442 OSCAR 19 (LUSAT) 1990-005G 20480 JAS 1B (FUJI 2) 1990-013C 21039 SL-12 R/B(1) 1990-116B 21087 INFORMATOR 1 1991-006A 21089 COSMOS 2123 1991-007A 21575 OSCAR 22 (UoSAT 5) 1991-050B 22825 KITSAT B 1993-061C 22826 POSAT 1 1993-061D 22828 ITAMSAT 1993-061F 22829 EYESAT A 1993-061G 23439 RADIO ROSTO 1994-085A 24278 JAS 2 1996-046B 24305 UNAMSAT 1996-052B 25396 TMSAT 1998-043C 25397 TECHSAT 1B 1998-043D 25509 SEDSAT 1 1998-061B 25520 PAN SAT 1998-064B 25544 ISS (ZARYA) 1998-067A 25636 SUNSAT 1999-008C 25693 OSCAR 36 (UoSAT 12) 1999-021A 25756 KITSAT 3 1999-029A 26063 OPAL 2000-004C 26545 SAUDISAT 1A 2000-057A 26548 TIUNGSAT 1 2000-057D 26609 AMSAT OSCAR 40 2000-072B 26931 PCSAT 2001-043C 26932 SAPPHIRE 2001-043D 27605 RUBIN 2 2002-058A 27607 SAUDISAT 1C 2002-058C 27842 DTUSAT 2003-031C 27844 CUTE-1 2003-031E 27845 QUAKESAT 2003-031F 27847 CANX-1 2003-031H 27848 CUBESAT XI-IV 2003-031J 27939 MOZHAYETS 4 2003-042A 28375 AMSAT ECHO 2004-025K 28650 HAMSAT 2005-017B 28890 BEIJING 1 (TSINGHUA) 2005-043A 28891 TOPSAT 2005-043B 28892 UWE-1 2005-043C 28893 SINAH 1 2005-043D 28894 SSETI-EXPRESS 2005-043E 28895 CUBESAT XI-V 2005-043F 28897 SSETI-EXPRESS DEB 2005-043H 28898 MOZ.5/SAFIR/RUBIN 5/SL-8 2005-043G 28941 CUTE 1.7 2006-005C 29252 GENESIS 1 2006-029A 29479 HINODE (SOLAR B) 2006-041A 29655 GENESAT 2006-058C 29712 PEHUENSAT 1 2007-001D 31117 EGYPTSAT 1 2007-012A 31122 CSTB 1 2007-012F 31126 MAST 2007-012K 31128 LIBERTAD 1 2007-012M 31129 CP3
[amsat-bb] Re: All Satellites
Are all the satellites containing the RS transponders included? It seems like some or all are missing. - Duffey -- KK6MC James Duffey Cedar Crest NM ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
Hi Trevor, We somehow must start to get serious about the orbital modification concepts proposed by David, G0MRF (see his paper from the 2009 AMSAT-UK Colloquium), that will get a LEO satellite into a MEO orbit. I believe the concept (ion propulsion or similar) can, as David points out, over time in orbit, modify a LEO to something more useful. Many papers given recently by tiny propulsion system researchers at SmallSat and CubeSat conferences make it clear to me that some form of samll propulsion is in our future if we want to move out of LEO. Come to the AMSAT Symposium and listen to Dan Schultz, N8FGV, give his presentation - Hall Effect Thrusters for Amsat Satellite Missions, a Report from the International Electric Propulsion Conference While it's likely a real stretch for a 1U CubeSat, in a 3U CubeSat with up to 2U Cubes worth dedicated to ion propulsion, we might have something practical. While many I talk with say it isn't practical, I have no doubt it will happen in the not too distant future. I wonder who will take the lead and be first? It could sure help solve the problem of not having affordable launch opportunities to MEO any more. Regards...Bill - N6GHz Trevor . wrote: --- On Fri, 25/9/09, John W Lee k...@juno.com wrote: I wonder how many of those 50 are able to handle ham radio 2-way contacts ? Granted most of them haven't been able to handle UR 599 OM QSL via buro style contacts, the bulk have just been for self-training and technical investigations. But there again these self-training and technical investigation Amateur Radio satellites have been launched into very low orbits ( 1000 km) which means short pass time and short range - next to useless for two-way Amateur DX contacts. It is worth noting that Amateurs may well wax lyrical about Oscar 7 or 6 but they never mention Oscar 8, which had both Mode A and J. Why is this ? Simply the orbital height, nothing else. The fundamental problem we need to address is how to get a satellite from a readily available orbit below 1000 km to one whose apogee is 1400 km or greater. 73 Trevor M5AKA ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
--- On Fri, 25/9/09, Bill Ress b...@hsmicrowave.com wrote: While it's likely a real stretch for a 1U CubeSat, in a 3U CubeSat with up to 2U Cubes worth dedicated to ion propulsion, we might have something practical. While many I talk with say it isn't practical, I have no doubt it will happen in the not too distant future. I wonder who will take the lead and be first? Hi Bill, You're right, the potential is there for a 3U CubeSat that can achieve an apogee 1400 km. We'd need 1U of that to house the linear transponder but as you say the rest could be used for the propulsion system. As yet, as far as I'm aware, no-one has actually demonstrated a working propulsion mechanism that can fit in 2U but I'm convinced this is possible. The launch costs for a 3U CubeSat into 700 km LEO are well within the reach of the Amateur community, our challenge is to develop a means of raising the apogee. 73 Trevor M5AKA ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites (Alan P. Biddle)
At a SmallSat conference I attended on behalf of AMSAT this summer, I was amused at the casual assumption by a researcher that 50, Five Oh, cubesats could be launched as part of an upper atmosphere project using ham frequencies for the downlinks. (They would have a lifetime of only 3-4 months.) Jan King, W3GEY/VK4GEY, who does coordination of satellite frequencies, gently but firmly brought them down to earth a bit. On the one hand, we get new hams with interests in space communications from these projects, but on the other we need to prevent the de facto appropriation of needed frequencies. A fine line to walk. Alan WA4SCA The thing that worries me the most is that the de facto appropriation of our amateur satellite frequencies seems very likely if we continue along a path which keeps us from filling those slots with payloads of our own. All this complaining about cubesats and the use of amateur frequencies for telemetry is kind of pointless if we aren't using those frequencies and have no prospect of using those frequencies in the foreseeable future. It seems to me that coordinating 50 cubesats for four months could be a tractable problem, depending on the precise nature of the signals and their orbital spacing. It's not like there is a huge number of operational amateur satellites that they'd have to avoid. Mark K6HX ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
Trevor, Bill is right on about propulsion systems. There are several types of thrusters being worked on. Most are being pitched to extend the life of LEO cubesats, but in principle they could get us to MEO. As always, cost is a huge factor. When the Boeing rep says after a vendor presentation, You what HOW MUCH for that?! you know there are cost issues. ;) Alan WA4SCA ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
In a message dated 25/09/2009 22:10:17 GMT Standard Time, m5...@yahoo.co.uk writes: Hi Bill, You're right, the potential is there for a 3U CubeSat that can achieve an apogee 1400 km. We'd need 1U of that to house the linear transponder but as you say the rest could be used for the propulsion system. As yet, as far as I'm aware, no-one has actually demonstrated a working propulsion mechanism that can fit in 2U but I'm convinced this is possible. The launch costs for a 3U CubeSat into 700 km LEO are well within the reach of the Amateur community, our challenge is to develop a means of raising the apogee. 73 Trevor M5AKA Hi Trevor. There is a propulsion system being developed for cubesats using a hydrazine mono propellant that uses catalytic decomposition to produce a large volume of hot gaseous products. If initial claimed results can be repeated in production, then that unit can be propelled from typical LEO up to 1400km circular or 2000km eliptical. It's based on a 3U structure. It's not MEO, but its a lot more fun than 500km David G0MRF ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
Good point. Not everybody is interested in monitoring the one way downlinks on the majority of these more recent birds. Why is it that there is no problem getting large numbers of these types of satellites into orbit, yet good old fashioned two way linear and FM transponder birds are relatively far and few between? Regards and 73, James - ZL4JM/VK5JC Sent from my iPod On 26/09/2009, at 5:01, John W Lee k...@juno.com wrote: I wonder how many of those 50 are able to handle ham radio 2-way contacts ? K6YK On Fri, 25 Sep 2009 15:09:43 + Nigel Gunn G8IFF/W8IFF ni...@ngunn.net writes: Here's a list of all (known to me) satellites still in orbit with some designed in (but not necessarily operational) amateur band functionality. For those that think nothing has been happening recently, there have been 26 (so far) satellites launched this year, 13 in 2008 and 11 in 2007. Thats 50 birds in less than the past 3 years. Catalog NumberCommon NameInternational DesignatorComments 1293 OSCAR 3 1965-016F 6236 OSCAR 6 1972-082B 7530 OSCAR 7 1974-089B 10703 OSCAR 8 1978-026B 14129 OSCAR 10 1983-058B 14781 OSCAR 11 (UoSAT 2) 1984-021B 16909 JAS 1 (FUJI 1) 1986-061B 20437 OSCAR 14 (UoSAT 3) 1990-005B 20438 OSCAR 15 (UoSAT 4) 1990-005C 20439 OSCAR 16 (PACSAT) 1990-005D 20440 OSCAR 17 (DOVE) 1990-005E 20441 OSCAR 18 (WEBERSAT) 1990-005F 20442 OSCAR 19 (LUSAT) 1990-005G 20480 JAS 1B (FUJI 2) 1990-013C 21039 SL-12 R/B(1) 1990-116B 21087 INFORMATOR 1 1991-006A 21089 COSMOS 2123 1991-007A 21575 OSCAR 22 (UoSAT 5) 1991-050B 22825 KITSAT B 1993-061C 22826 POSAT 1 1993-061D 22828 ITAMSAT 1993-061F 22829 EYESAT A 1993-061G 23439 RADIO ROSTO 1994-085A 24278 JAS 2 1996-046B 24305 UNAMSAT 1996-052B 25396 TMSAT 1998-043C 25397 TECHSAT 1B 1998-043D 25509 SEDSAT 1 1998-061B 25520 PAN SAT 1998-064B 25544 ISS (ZARYA) 1998-067A 25636 SUNSAT 1999-008C 25693 OSCAR 36 (UoSAT 12) 1999-021A 25756 KITSAT 3 1999-029A 26063 OPAL 2000-004C 26545 SAUDISAT 1A 2000-057A 26548 TIUNGSAT 1 2000-057D 26609 AMSAT OSCAR 40 2000-072B 26931 PCSAT 2001-043C 26932 SAPPHIRE 2001-043D 27605 RUBIN 2 2002-058A 27607 SAUDISAT 1C 2002-058C 27842 DTUSAT 2003-031C 27844 CUTE-1 2003-031E 27845 QUAKESAT 2003-031F 27847 CANX-1 2003-031H 27848 CUBESAT XI-IV 2003-031J 27939 MOZHAYETS 4 2003-042A 28375 AMSAT ECHO 2004-025K 28650 HAMSAT 2005-017B 28890 BEIJING 1 (TSINGHUA) 2005-043A 28891 TOPSAT 2005-043B 28892 UWE-1 2005-043C 28893 SINAH 1 2005-043D 28894 SSETI-EXPRESS 2005-043E 28895 CUBESAT XI-V 2005-043F 28897 SSETI-EXPRESS DEB 2005-043H 28898 MOZ.5/SAFIR/RUBIN 5/SL-8 2005-043G 28941 CUTE 1.7 2006-005C 29252 GENESIS 1 2006-029A 29479 HINODE (SOLAR B) 2006-041A 29655 GENESAT 2006-058C 29712 PEHUENSAT 1 2007-001D 31117 EGYPTSAT 1 2007-012A 31122 CSTB 1 2007-012F 31126 MAST 2007-012K 31128 LIBERTAD 1 2007-012M 31129 CP3 2007-012N 31130 CAPE 1 2007-012P 31132 CP4 2007-012Q 31135 AGILE 2007-013A 31140 NFIRE 2007-014A 31789 GENESIS 2 2007-028A 32781 GIOVE-B 2008-020A 32783 CARTOSAT 2A 2008-021A 32784 CANX-6 2008-021B 32785 CUTE 1.7 AOD 2 2008-021C 32786 IMS-1 2008-021D 32787 COMPASS 1 2008-021E 32788 AAUSAT CUBESAT 2 2008-021F 32789 DELFI C3 2008-021G 32790 CANX-2 2008-021H 32791 SEEDS 2008-021J 32792 RUBIN 8/PSLV 2008-021K 32794 AMOS 3 2008-022A 32953 YUBILEINY 2008-025A 33492 GOSAT (IBUKI) 2009-002A 33493 PRISM (HITOMI) 2009-002B 33494 SPRITE-SAT (RISING) 2009-002C 33495 KAGAYAKI 2009-002D 33496 SOHLA-1 (MAIDO-1) 2009-002E
[amsat-bb] Re: All Satellites
At 09:34 AM 9/26/2009, James Craig wrote: Good point. Not everybody is interested in monitoring the one way downlinks on the majority of these more recent birds. Why is it that there is no problem getting large numbers of these types of satellites into orbit, yet good old fashioned two way linear and FM transponder birds are relatively far and few between? I for one was never a SWL, so I tend not to follow the one way satellites, unless there's a compelling reason (e.g. for test signals, or telemetry decoding - had fun decoding telemetry on AO-40 when it was first launched). 73 de VK3JED / VK3IRL http://vkradio.com ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Sat status - new feature
Added a panel display http://vk4tec.no-ip.org/sat_status/ Any other sats that make it onto the APRS_IS let me know and I can add -- Andrew Rich Airways Technical Officer Grade 4 Surveillance - RADAR ADS-B Amateur Radio Callsign VK4TEC email: vk4...@tech-software.net web: www.tech-software.net ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
Good point. Not everybody is interested in monitoring the one way downlinks on the majority of these more recent birds. Why is it that there is no problem getting large numbers of these types of satellites into orbit, yet good old fashioned two way linear and FM transponder birds are relatively far and few between? Regards and 73, James - ZL4JM/VK5JC Well, after the launch of AO-51 here in the U.S., the AMSAT membership seemed to think that they should concentrate their efforts on a HEO launch. The problem is that there really aren't any viable launch options for HEO satellites. We aren't alone either: P3E is considerably further along than any of the AMSAT-NA projects, and yet has no hint of how it might get boosted to orbit. Cubesats are being launched for one simple reason: people have figured out how to fund low mass sats to low earth orbit. We could probably launch a couple dozen LEO cubesats (or more) for what it would cost to put just one payload into HEO, but nobody seems to really be interested in doing that, since it won't give anyone the DX that they want. I think there have been some interesting developments in micro propulsion technologies, but it is still challenging to get a cubesat in orbit that can serve as a transponder within the weight and space limitations that cubesats have. Perhaps when commercial vehicles like the Falcon 9 begin launching, we'll see a sufficient reduction in payload boosting costs to make raising the money for a HEO satellite with significant mass reasonable. We shall have to see. Mark K6HX ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE
- Original Message - From: Bruce Robertson ve9...@gmail.com To: Jeff Yanko wb3...@cox.net Cc: AMSAT-BB amsat-bb@amsat.org Sent: Friday, September 25, 2009 3:53 PM Subject: [amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE Jeff -- snip 2. If I'm correct, your replacement duplexer is rather larger than the one it is replacing. It would be a great topic for a Journal article if someone with the necessary equipment and expertise were to design a replacement with less loss. 73, Bruce VE9QRP Hi Bruce, VE9QRP See QEX March/April 2002 page 47 A Low-Loss VHF/UHF Diplexer by Pavel Zanek OK1DNZ Loss = 0.15 dB at VHF and 0.40 dB at UHF Insulation VHF/UHF = 70 dB Max RF power at VHF or UHF or VHF/UHF = 100 watt CW at 25° 73 de i8CVS Domenico ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE
as in the texts below, there is something else going on here. That Diplexor can not be all that bad. two reasons. How many db down is the front to side of that antenna? and I can not imaging someone would sell a diplexor that has greater than 20 db of losses. because of the statement that how criticalpolarity was with the original, and now the antenna has to be nearly 90 degrees cross polarized to make it drop out uhh that close to 30 db, at least 20,, something else is going on here Gary Joe Mayfield wrote: Another issue I came across was how wide the beamwidth is of the Arrow Antenna between the Arrow diplexer and the new diplexer. I was wondering if this was going to happen and it did. The reason that this happened was with the old diplexer, the signal attenuated so much that you had to be pointed right smack dab on the bird, a few degrees off and you lost the signal. Now, with the new diplexer, you can point the beam in the general direction and still copy the bird. In most cases I had to turn the beam 90 degrees before I completely lost the downlink! Twisting the antenna to make polarization changes makes absolutely no difference now. This also attributes to the fact that now I'm copying the entire pass without dropouts or fades. Makes sense. What I've regained over the lossy diplexer makes up for any polarization differences, etc. for a better copiable signal. Next weekend I will have to try more passes and get a feel of how much this system has changed. 73, Jeff WB3JFS Las Vegas, NV DM26 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.416 / Virus Database: 270.13.113/2395 - Release Date: 09/25/09 17:52:00 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE
To All, The Diplexer also acts as a filter. All solid state transmitters have White Noise contributions. If you receive while transmitting the White Noise from the 2M side will desense the 70 cm receiver. The amount of noise typically 60 dB down from the carrier varies with the type of output filter used in the transmitter. Of course this does not apply when working the satellite simplex. A bad diplexer can also be the problem. Soldering is poor in some of these overseas units, also excessive power in a former life will cook the parts inside. A good test with 50 loads and a power meter will tell the condition of the diplexer. Art, KC6UQH -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Joe Sent: Friday, September 25, 2009 6:43 PM To: Gary Joe Mayfield Cc: 'AMSAT-BB' Subject: [amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE as in the texts below, there is something else going on here. That Diplexor can not be all that bad. two reasons. How many db down is the front to side of that antenna? and I can not imaging someone would sell a diplexor that has greater than 20 db of losses. because of the statement that how criticalpolarity was with the original, and now the antenna has to be nearly 90 degrees cross polarized to make it drop out uhh that close to 30 db, at least 20,, something else is going on here Gary Joe Mayfield wrote: Another issue I came across was how wide the beamwidth is of the Arrow Antenna between the Arrow diplexer and the new diplexer. I was wondering if this was going to happen and it did. The reason that this happened was with the old diplexer, the signal attenuated so much that you had to be pointed right smack dab on the bird, a few degrees off and you lost the signal. Now, with the new diplexer, you can point the beam in the general direction and still copy the bird. In most cases I had to turn the beam 90 degrees before I completely lost the downlink! Twisting the antenna to make polarization changes makes absolutely no difference now. This also attributes to the fact that now I'm copying the entire pass without dropouts or fades. Makes sense. What I've regained over the lossy diplexer makes up for any polarization differences, etc. for a better copiable signal. Next weekend I will have to try more passes and get a feel of how much this system has changed. 73, Jeff WB3JFS Las Vegas, NV DM26 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.416 / Virus Database: 270.13.113/2395 - Release Date: 09/25/09 17:52:00 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb __ Information from ESET NOD32 Antivirus, version of virus signature database 4458 (20090925) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 4458 (20090925) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites (Alan P. Biddle)
At a SmallSat conference... this summer, I was amused at the casual assumption by a researcher that 50, cubesats could be launched as part of an upper atmosphere project using ham frequencies for the downlinks. And wouldnt it be a hoot if everyone of them could put their RX/TX into a bent-pipe packet mode, and then we would have amateur radio global hand-held text messaging satellite system... (They would have a lifetime of only 3-4 months.) But it would be FUN for a while! Using some of the 2-way very small micro APRS packet systems, a 2 to 5 Watt transponder will easily fit on a singl circuit card in a small cubesat. See www.aprs.org/cubesat-comms.html Bob, WB4APR ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
Jim...very few of them have any potential for Amateur use at all...most however also die quickly. Robert WB5MZO Date: Fri, 25 Sep 2009 13:38:45 -0700 From: kq...@pacbell.net To: amsat-bb@amsat.org; kg4...@gmail.com Subject: [amsat-bb] Re: All Satellites Do any of these have potential for Amateur use after their primary mission is completed? If they can be repurposed like AO-27, then I don't have any complaints. If, OTOH, all they're good for is sending telemetry for somebody's experiment, then I feel this is an inappropriate use of Amateur frequencies. 73, Jim KQ6EA --- On Fri, 9/25/09, David - KG4ZLB kg4...@googlemail.com wrote: From: David - KG4ZLB kg4...@googlemail.com Subject: [amsat-bb] Re: All Satellites To: amsat-bb@amsat.org Date: Friday, September 25, 2009, 1:10 PM I hate to say it but you may be right - the sky is now full of beep-beep sats! David KG4ZLB Rocky Jones wrote: The hamsat bands are slowly being converted into cheap telemetry bands... Robert WB5MZO _ Bing™ brings you maps, menus, and reviews organized in one place. Try it now. http://www.bing.com/search?q=restaurantsform=MLOGENpubl=WLHMTAGcrea=TEXT_MLOGEN_Core_tagline_local_1x1 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _ Insert movie times and more without leaving Hotmail®. http://windowslive.com/Tutorial/Hotmail/QuickAdd?ocid=TXT_TAGLM_WL_HM_Tutorial_QuickAdd_062009 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
Perhaps when commercial vehicles like the Falcon 9 begin launching, we'll see a sufficient reduction in payload boosting costs to make raising the money for a HEO satellite with significant mass reasonable. We shall have to see. Mark K6HX ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb Mark if there is a future for amateur HEO's the birds are going to be more Arsene and Oscar IV size. Robert WB5MZO _ Lauren found her dream laptop. Find the PC that’s right for you. http://www.microsoft.com/windows/choosepc/?ocid=ftp_val_wl_290 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
I will attempt a reply to both of these responses. On Fri, Sep 25, 2009 at 9:27 PM, Tony Langdon vk3...@gmail.com wrote: At 09:34 AM 9/26/2009, James Craig wrote: Good point. Not everybody is interested in monitoring the one way downlinks on the majority of these more recent birds. Why is it that there is no problem getting large numbers of these types of satellites into orbit, yet good old fashioned two way linear and FM transponder birds are relatively far and few between? The reason cubesats are being built is because they are seen as an excellent platform for educating space science students at the undergraduate level. The amount of money being spent per launch is pretty doable for many institutions or local granting agencies. These agencies and universities are likely simply not interested in providing you or me with a platform for two-way terrestrial communication if it is going to slow down their project or lower its probability of success. The cubesat design is quite constrained moreover, typically 10cm^3 and under one kg, even the milk-carton sized 3U format is pretty small for the power needs of a linear or FM transponder of the sort we are typically using. We owe a debt of gratitude to Delfi, which showed that a linear can be put up as a secondary mission, and to William for his 10cm^2 transponder implementation. Those are very recent developments, and I'd agree that we should jump on them as golden opportunities, noting however, that the result will still be very low altitude orbits and therefore small footprints. Similarly, SDX technology might be able to miniaturize the transponder further and reduce its power needs (while making one circuit a do-everything transponder!), so we're lucky that we're testing that technology in the near future. Please note that there is no contention for resources here: the opportunities the universities made use of are not available to us. If we want this phenomenon to work to the advantage of those of us who enjoy two-way voice communications, we need to either launch a cubesat ourselves or offer the university projects a reason that adding this capability will *improve* the time-to-launch or probability of success. This might be in the form of a free, tested, reliable communications board that happens to have two-way voice capability integrated into it. It also could be in the form of increased amateur enthusiasm for the transponder-bearing cubesat and the resulting increase in telemetry collection, a bargain which we proved to be good for in Delfi C3. I for one was never a SWL, so I tend not to follow the one way satellites, unless there's a compelling reason (e.g. for test signals, or telemetry decoding - had fun decoding telemetry on AO-40 when it was first launched). Nor was I, yet I very much enjoy listening to telemetry from cubesats, along with other activities in this corner of the hobby. I can offer you this reason: when I listen to telemetry, I'm listening to something which is in space and in orbit around the earth, one of the most exotic locales from which you could receive a message. If I talk to you on AO-51, I'm talking to you on earth by means of a space-borne vehicle. It turns out that what's fun about that for me is not necessarily your voice, but the vehicle. Telemetry tells me about those vehicles: how fast they are moving, how they are tumbling and the contents of the telemetry stream: how much power they're collecting and using. Moreover, with some of the cubesats, the decoding of this is very easy if one knows CW. Two more points in my brief apologia pro cubesatibus 1. So-called 'telemetry only' birds are not necessarily that. We had the opportunity to control COMPASS during its crisis last year. The low cost of the mission meant that any one of us was solicited to enter the appropriate codes. I'll never be a control station for a major bird, but I thrilled to do this for COMPASS. 2. Given that you admit above that telemetry collection is necessary for the maintenance of communication satellites, shouldn't you be glad that this steady stream of cubesats has allowed some enthusiasts to continue to hone their skills in this field? Finally, a truism that probably bears repeating, though not addressing the two comments quoted above: if we call cubesats 'not amateur radio', then we should tar OSCAR 1 with that same brush. 73, Bruce VE9QRP ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
On Fri, Sep 25, 2009 at 7:34 PM, g0...@aol.com wrote: In a message dated 25/09/2009 22:10:17 GMT Standard Time, m5...@yahoo.co.uk writes: Hi Bill, You're right, the potential is there for a 3U CubeSat that can achieve an apogee 1400 km. We'd need 1U of that to house the linear transponder but as you say the rest could be used for the propulsion system. As yet, as far as I'm aware, no-one has actually demonstrated a working propulsion mechanism that can fit in 2U but I'm convinced this is possible. The launch costs for a 3U CubeSat into 700 km LEO are well within the reach of the Amateur community, our challenge is to develop a means of raising the apogee. 73 Trevor M5AKA Hi Trevor. There is a propulsion system being developed for cubesats using a hydrazine mono propellant that uses catalytic decomposition to produce a large volume of hot gaseous products. If initial claimed results can be repeated in production, then that unit can be propelled from typical LEO up to 1400km circular or 2000km eliptical. It's based on a 3U structure. It's not MEO, but its a lot more fun than 500km David G0MRF Oh, I love this idea, and I put my vote in for the elliptical. (Not that I have a vote :-) The occasional massive footprint would be really neat to play with, and justify all our overkill antenna arrays. I'm guessing we'd need the 3U format for linear transponder anyway, since the requisite solar panel area is not available in 1U. 73, Bruce VE9QRP ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
Finally, a truism that probably bears repeating, though not addressing the two comments quoted above: if we call cubesats 'not amateur radio', then we should tar OSCAR 1 with that same brush. 73, Bruce VE9QRP ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb Bruce...that is really not fair. Oscar 1 (and 2) were first time for a lot of things and had at their heart the goal of building amateur radio communications platforms...that is why Oscar X (I think that is what they call it...a repeat of Oscar 1 and 2) was shelved in favor of Oscar III a communications platform. Both Oscar 1 and II lasted until their batteries ran out...indeed I think Number 1 lasted until it decayed..Oscar V tested communications technology from spacecraft stabilization to command systems etc. and it lasted until its batteries ran out .that is far longer sat life then most of the cubesats have. which mostly have nothing to do with amateur radio Robert WB5MZO _ Lauren found her dream laptop. Find the PC that’s right for you. http://www.microsoft.com/windows/choosepc/?ocid=ftp_val_wl_290 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: All Satellites
On Sat, Sep 26, 2009 at 2:03 AM, Rocky Jones orbit...@hotmail.com wrote: Finally, a truism that probably bears repeating, though not addressing the two comments quoted above: if we call cubesats 'not amateur radio', then we should tar OSCAR 1 with that same brush. 73, Bruce VE9QRP ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb Bruce...that is really not fair. I'm sorry if I'm not being fair. I rather think, though, that there is an important difference of opinion here on what constitutes amateur activity. I'd like to explore it further with your permission. Oscar 1 (and 2) were first time for a lot of things and had at their heart the goal of building amateur radio communications platforms...that is why Oscar X (I think that is what they call it...a repeat of Oscar 1 and 2) was shelved in favor of Oscar III a communications platform. If you are advocating a litmus test for amateur activity, especially in the satellite field, that is based on novelty, then I cannot see how you are not equally opposed to those aspects of P3E that are self-consciously emulating previous satellites (everything other than SDX and CAN-DO?) In fact, in common practice innovation is too high a bar to set for amateur activity: we don't expect each ham to invent a new modulation scheme before getting on a local repeater for the first time; and I know that when and if a HEO satellite is in orbit again, you will not deprecate my enjoyment of following in the footsteps of many before me who have undertaken linear transponder communications on that platform. I will meet you half way and say that innovation is a hallmark of amateur satellite operations, though not a requirement. This is why I am very excited by upcoming tests of SDX. It is also, incidentally, why I applaud the achievements of the cubesat groups, whose very form-factor is innovative, and who undertake innovative applications, such as spacecraft stabilization for potential experiments in formation flying, high-quality image capture, new communication modes, physics experiments, etc., a list that reads much like the one you apply to Oscar V below: Both Oscar 1 and II lasted until their batteries ran out...indeed I think Number 1 lasted until it decayed..Oscar V tested communications technology from spacecraft stabilization to command systems etc. and it lasted until its batteries ran out I can't tell here: are you suggesting that battery-operated satellites are more in the amateur spirit? Doesn't this contravene your innovation criterion? Were not batteries in Oscar 1-5 faute de mieux? You seem to be implying that the Oscar 1 designers eschewed the solar panels available to them and wisely chose the limited lifetime option. My understanding of the history of technology is somewhat hazy, but as it is, it doesn't fit this picture. .that is far longer sat life then most of the cubesats have. which mostly have nothing to do with amateur radio In your opinion, is short life a knock against cubesats? Maybe it's a good idea to have shorter missions in some cases. Short life is not always true, of course: CO-57, e.g., has been in operation for over six years. 73, Bruce VE9QRP ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
