[amsat-bb] Re: can RF change the orientation of a satellite?
Hi, Thanks for the informative reply! So it follows that this class of satellite with a maximum RF power output of, say 3000W with all transponders fully loaded, that would add up to significant forces! I'm also fairly certain that the primary transmitting reflector hangs from the side of these satellites, opposite the receiving reflector, so this is making sense. Until now, it was the last factor I would have expected for prolonging the saga of Zombiesat! Maybe they could send up some carriers at the passband edges of each transponder while in-between orbital slots just to hasten the progress of the saturation of the momentum-wheels?(just kidding) I'll be reading with great interest, any news of how Galaxy 15 behaves after it has finally run it's batteries down to cutoff, and if it can show what the fault actually was, upon possible resumption of telemetry. There could be a lesson in this for Amateur satellite designers and builders, where fault-tolerance is definitely JUST AS important as fault-avoidance - we always like our hardware to be useful to the last drop(AO-7). Actually, Oscar 7 has now spent the bulk of her wakeful time in a FAULTY state, while still very useful... legendary! 73 Auke - Original Message - From: "Daniel Schultz" To: Sent: Sunday, October 24, 2010 7:15 PM Subject: [amsat-bb] Re: can RF change the orientation of a satellite? It makes sense. Satellites are subject to solar radiation pressure from absorption of sunlight, they are also subject to radiation pressure from emission of RF radiation. The wavelength of the radiation does not enter into this calculation so the pressure from radio frequency radiation is the same as that of visible light radiation. Radiation pressure is the electromagnetic power flux density divided by the speed of light. If a 100 watt transponder emits RF in a narrow beam from a 1 square meter antenna, the radiation pressure on the satellite will be 100 watts / (1 square meter * 3E8 meters/sec) = 0.33 micropascals. The force on a 1 square meter antenna will thus be 0.33 micronewtons. This is not the same as ion propulsion because no physical mass is expelled from the satellite. For amateur satellites with omnidirectional antennas, the RF is emitted in all directions and the force cancels out. Intelsat birds emit RF in tightly focused beams so there will be a net force on the satellite, and if the antenna is off axis from the satellite's center of gravity this force will exert a torque which could cause the momentum wheels to spin up. The uplink RF is minuscule (microwatts per square meter or less) but the lack of uplink signals causes the linear transponders to have zero RF output (other than noise), thus causing reduced off axis pressure on the satellite. Dan Schultz N8FGV I couldn't help but notice that on this website http://www.intelsat.com/resources/galaxy-15/faqs.asp about "zombiesat" Galaxy 15, Intelsat figures that the lack of RF on thr transponder package since their loss of control earlier this year, will actually make it take longer to saturate it's momentum-wheel orientation stablizer system. This, compared to the manufacturer's original estimate of achieving the saturation condition beuing several months sooner having assumed normal full-load of RF on the transponders. My question is: How is this possible? Does the RF put acceleration-forces on the transmitting antenna of the satellite similar to ion propulsion, or does the uplink RF push on the receiving antenna? Is there some other mechanism that can electronically alter the forces acting on the body of the satellite based on the amount of RF power? ___ 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 message. Checked by AVG - www.avg.com Version: 10.0.1144 / Virus Database: 422/3217 - Release Date: 10/24/10 ___ 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] HO-68 Schedule 24-31 Oct 2010
UTC: 24 Oct 2010 16:40...Turn On--CW/SSB India, Africa, Middle East, Europe,NA 17:25...Turn Off 18:30...Turn On--CW/SSB Africa,Europe,Middle East,NA 19:15...Turn Off 19:55...Turn On--CW/SSB Africa,Europe,Middle East,NA 20:40...Turn Off 22:35...Turn On--CW/SSB South America,NA,North Asia 23:20...Turn Off 25 Oct 2010 02:11...Turn On--CW/SSB North Asia,East Asia,South Asia 02:26...Turn Off 13:10...Turn On--CW/SSB NA,South America 13:55...Turn Off 16:25...Turn On--CW/SSB India, Africa, Middle East, Europe,NA 17:10...Turn Off 18:15...Turn On--CW/SSB NA,East Asia,Oceania 19:00...Turn Off 26 Oct 2010 00:05...Turn On--CW/SSB NA,North Asia,East Asia, Oceania 00:50...Turn Off 02:04...Turn On--CW/SSB North Asia, East Asia,South Asia 02:19...Turn Off 10:15...Turn On--CW/SSB Oceania,Asia,Europe 11:00...Turn Off 12:55...Turn On--CW/SSB NA, South America 13:40...Turn Off 16:05...Turn On--CW/SSB India,Middle East,Europe,NA 16:50...Turn Off 18:40...Turn On--CW/SSB India,Middle East,Europe,NA 19:25...Turn Off 19:35...Turn On--CW/SSB Africa,Europe,NA 20:15...Turn Off 27 Octp 2010 = 23:45...Turn On--CW/SSB North Asia,East Asia,South Asia Oceania 00:30...Turn Off 03:31...Turn On--CW/SSB North Asia,East Asia,South Asia 03:45...Turn Off 14:25...Turn On--CW/SSB Europe,NA,South America 15:10...Turn Off 17:40...Turn On--CW/SSB India, Africa,Europe,NA South America 18:25...Turn Off 19:25...Turn On--CW/SSB Africa,Middle East,Europe,NA 20:10...Turn Off 20:55...Turn On--CW/SSB Africa,Middle East,Europe,NA 21:40...Turn Off 28 Oct 2010 = 23:30...Turn On--CW/SSB NA,North Asia,East Asia,Oceania 00:15...Turn Off 03:15...Turn On--CW/SSB Asia,Oceania 03:27...Turn Off 14:10...Turn On--CW/SSB Europe,NA,South America 14:55...Turn Off 17:20...Turn On--CW/SSB Africa,India,Middle East Europe,NA 18:05...Turn Off 19:10...Turn On--CW/SSB Africa,Europe,NA 19:55...Turn Off 20:35...Turn On--CW/SSB Africa,Europe,NA 21:20...Turn Off 29 Oct 2010 23:15...Turn On--CW/SSB Oceania,Asia,Europe,NA 00:00...Turn Off 02:59...Turn On--CW/SSB North Asia,East Asia,South Asia 03:13...Turn Off 13:50...Turn On--CW/SSB Europe, NA,South America 14:35...Turn Off 17:05...Turn On--CW/SSB India,Africa,Europe,NA 17:50...Turn Off 18:55...Turn On--CW/SSB India,Africa,Europe,NA 19:40...Turn Off 20:20...Turn On--CW/SSB Africa,Europe,NA 21:05...Turn Off 22:55...Turn On--CW/SSB South America,NA,North Asia 23:40...Turn Off 30 Oct 2010 02:44...Turn On--FM North Asia,East Asia,South Asia 03:00...Turn Off 13:35...Turn On--CW/SSB Europe, NA,South America 14:20...Turn Off 16:45...Turn On--CW/SSB Africa,Europe,NA 17:30...Turn Off 18:35...Turn On--CW/SSB India,Africa,Europe,NA 19:20...Turn Off 20:00...Turn On--CW/SSB Africa,Europe,NA 20:45...Turn Off 22:40...Turn On--CW/SSB North Asia,East Asia, South Asia,Oceania 23:25...Turn Off 31 Oct 2010 02:26...Turn On--CW/SSB North Asia,East Asia,South Asia Oceania 02:42...Turn Off 13:15...Turn On--CW/SSB Europe,NA,South America 14:00...Turn Off 73 Alan Kung, BA1DU HO-68(XW-1) Project Manager www.camsat.cn ___ 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] Why We Do What We Do - Part 19
I just returned to the house after working a non-ham-radio-related event since 6:30 this morning (a nonprofit equine rehab center that my wife and I are board members). But I just HAVE to check email before crashing ... There are some who say that promoting working the FM birds is a futile effort. "Nothing comes of it," I have seen a few write. Well, this email is from a person who worked JOTA last weekend. I was supposed to - but instead was presenting my show at PACIFICON in San Ramon, CA. But I traded notes with this person ... we compared pass times and freq data ... I have been to their club three times the past three years to give me presentation and demo. And we even worked each other: me from the parking lot in San Ramon, and she with her Scouts in Victorville, CA. >From her email just received ... - - - - - - - - - - - - - - - - - - - - - - - - - - - Hi Clint! Hope you and Karen's trip up north went well. Well, you have started something. I have gotten some local hams interested or re-interested in working AMSAT. And I have been doing some more demos locally. I am the low-tech version - with a compass, and recorder hung around my neck and a clipboard with the sat passes info. And since I can't hold the antenna up that long, I have it mounted on a tripod. Don't laugh - it works! And I am even tromping out at 10:00 pm (very bright last night). And Bruce and I have subscribed to AMSAT mag and joined. Thanks again, Clint. 73 - Christy KB6LTY - - - - - - - - - - - - - - - - - - - - - - - - - - NO, Christy, I am not "laughing." But there is a broad smile on my face tonight. THANK YOU for joining AMSAT. And thank you for your infectious enthusiasm. Clint, K6LCS http://www.work-sat.com -- Clint Bradford, K6LCS http://www.clintbradford.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: can RF change the orientation of a satellite?
It makes sense. Satellites are subject to solar radiation pressure from absorption of sunlight, they are also subject to radiation pressure from emission of RF radiation. The wavelength of the radiation does not enter into this calculation so the pressure from radio frequency radiation is the same as that of visible light radiation. Radiation pressure is the electromagnetic power flux density divided by the speed of light. If a 100 watt transponder emits RF in a narrow beam from a 1 square meter antenna, the radiation pressure on the satellite will be 100 watts / (1 square meter * 3E8 meters/sec) = 0.33 micropascals. The force on a 1 square meter antenna will thus be 0.33 micronewtons. This is not the same as ion propulsion because no physical mass is expelled from the satellite. For amateur satellites with omnidirectional antennas, the RF is emitted in all directions and the force cancels out. Intelsat birds emit RF in tightly focused beams so there will be a net force on the satellite, and if the antenna is off axis from the satellite's center of gravity this force will exert a torque which could cause the momentum wheels to spin up. The uplink RF is minuscule (microwatts per square meter or less) but the lack of uplink signals causes the linear transponders to have zero RF output (other than noise), thus causing reduced off axis pressure on the satellite. Dan Schultz N8FGV >I couldn't help but notice that on this website >http://www.intelsat.com/resources/galaxy-15/faqs.asp about "zombiesat" >Galaxy 15, Intelsat figures that the lack of RF on thr transponder package >since their loss of control earlier this year, will actually make it take >longer to saturate it's momentum-wheel orientation stablizer system. This, >compared to the manufacturer's original estimate of achieving the saturation >condition beuing several months sooner having assumed normal full-load of RF >on the transponders. >My question is: How is this possible? Does the RF put acceleration-forces >on the transmitting antenna of the satellite similar to ion propulsion, or >does the uplink RF push on the receiving antenna? Is there some other >mechanism that can electronically alter the forces acting on the body of the >satellite based on the amount of RF power? ___ 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] WTB G-5500 control box
Would anyone happen to have a G-5500 control box by itself that they would like to sell? 73, Drew KO4MA ___ 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: AO-51 short experiment
Sorta on the same order as the 432mhz ground station terrestrial stations messing with AO-7 in mode B. There though we are blessed with extra bandwidth on the linear translator vs single channel FM repeater. HO-68 is a PITA to work on FM for me, but great linear bird. John W6ZKH From: Bob Herrell To: amsat-bb@amsat.org Sent: Sun, October 24, 2010 3:02:24 PM Subject: [amsat-bb] Re: AO-51 short experiment Alan, I agree with you totally. It is going to be an ongoing problem and unless individual operators take responsibility for their emissions, it is going to continue. Even with coordination the frequency is still not owned by any particular station. It is just common courtesy that we need to show to each other. Are these APRS stations just beaconing in hopes of hitting the ISS or are they in use for normal APRS? I don't see 145.825MHz being used as a terrestrial frequency. I can understand the problem when HO-68 and the ISS are in the same footprint, but to run a station continuously on 145.825MHz is crazy. I do send packets to the ISS myself, but ONLY when it is in view and turned on. It all boils down to the old idea of "Listen before you talk". 73, Bob AJ5C From: Alan P. Biddle To: Bob Herrell ; amsat-bb@amsat.org Sent: Sun, October 24, 2010 3:45:18 PM Subject: RE: [amsat-bb] Re: AO-51 short experiment Bob, 145.825 is the "established" space APRS frequency, and has been/is used by more than just the ISS for years. There are other APRS satellites which are intermittently active on the same frequency, and I expect there will be others in the future. I can't address the formal coordination issue, but anything with an uplink on that frequency is guaranteed to have problems. The only question is whether those problems are tolerable. There is little to no APRS activity on that frequency over most of the world, and then there is the question of both HO-68 and the ISS being in the same footprint. The HO-68 has an inclination of about 102 degrees, the ISS about half that. Finally, the ISS is not active on that frequency 24/7. It operates on other frequencies for voice and SSTV, and is often QRT completely due to other operations. In an imperfect world, it looks like a reasonable tradeoff, though other evaluations are certainly possible. The problem of unattended APRS beacons does cut both ways. There are some daylight-only APRS satellites. When they enter periods of extended illumination, they can be commanded from their default modes. However, even a single "braaap" can pull the DC busses low enough that the command stations need to start over again. WB4APR has lamented this problem, with specific calls, in other venues. Looking at some of the paths, both in Drew's example and my reception, there are stations whose paths have not been updated for years. The sort of courtesy/coordination issue is not limited to space operations. A ham relatively local to me fired up a propagation beacon on 30 meters this month. It is/was within 200 HZ of an APRS frequency which has been in use for some time. Quite a fight over who "owns" the frequency. ;) 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 ___ 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] Fwd: Next "HV Satcom" Net
*By the way, for those who checked in via Echolink 2 weeks ago 10/07), sorry abt. the Interferance, & hope we can have a hassle=free net this Thur. (Bob), FYI; the next Nt. Beacon "In Person "meeting is Nov. 9, Po'k gallaria Mall (7PM;Community room!) 73,.Stu (WA2BSS; Director) * -- Forwarded message -- From: Stuart Balanger Date: Fri, Oct 22, 2010 at 7:00 PM Subject: Next "HV Satcom" Net To: ans-edi...@amsat.org *Hi all, The next "HV Satcom" net is Thur. Oct. 28 2 8PM (EDT) (or 2400 UTC) on the 146.970 Mt. Beacon ARC 2 meter Repeater, w/ a Echolink node of N2EYH-L More info: www.hvsatcom.org or E-Mail; wa2...@amsat.org 73,.Stu (WA2BSS: Director) PS Hope this isn't too late, & happy "Halloween"! * ___ 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: AO-51 short experiment
Alan, I agree with you totally. It is going to be an ongoing problem and unless individual operators take responsibility for their emissions, it is going to continue. Even with coordination the frequency is still not owned by any particular station. It is just common courtesy that we need to show to each other. Are these APRS stations just beaconing in hopes of hitting the ISS or are they in use for normal APRS? I don't see 145.825MHz being used as a terrestrial frequency. I can understand the problem when HO-68 and the ISS are in the same footprint, but to run a station continuously on 145.825MHz is crazy. I do send packets to the ISS myself, but ONLY when it is in view and turned on. It all boils down to the old idea of "Listen before you talk". 73, Bob AJ5C From: Alan P. Biddle To: Bob Herrell ; amsat-bb@amsat.org Sent: Sun, October 24, 2010 3:45:18 PM Subject: RE: [amsat-bb] Re: AO-51 short experiment Bob, 145.825 is the "established" space APRS frequency, and has been/is used by more than just the ISS for years. There are other APRS satellites which are intermittently active on the same frequency, and I expect there will be others in the future. I can't address the formal coordination issue, but anything with an uplink on that frequency is guaranteed to have problems. The only question is whether those problems are tolerable. There is little to no APRS activity on that frequency over most of the world, and then there is the question of both HO-68 and the ISS being in the same footprint. The HO-68 has an inclination of about 102 degrees, the ISS about half that. Finally, the ISS is not active on that frequency 24/7. It operates on other frequencies for voice and SSTV, and is often QRT completely due to other operations. In an imperfect world, it looks like a reasonable tradeoff, though other evaluations are certainly possible. The problem of unattended APRS beacons does cut both ways. There are some daylight-only APRS satellites. When they enter periods of extended illumination, they can be commanded from their default modes. However, even a single "braaap" can pull the DC busses low enough that the command stations need to start over again. WB4APR has lamented this problem, with specific calls, in other venues. Looking at some of the paths, both in Drew's example and my reception, there are stations whose paths have not been updated for years. The sort of courtesy/coordination issue is not limited to space operations. A ham relatively local to me fired up a propagation beacon on 30 meters this month. It is/was within 200 HZ of an APRS frequency which has been in use for some time. Quite a fight over who "owns" the frequency. ;) 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: AO-51 short experiment
No one 'owns the frequency' and if in-place coordination can not resolve the issue, the newest user should consider moving out of the required bandpass. Was the first user ever coordinated? ~~Larry W7IN~~ On 10/24/2010 2:45 PM, Alan P. Biddle wrote: Bob, 145.825 is the "established" space APRS frequency, and has been/is used by more than just the ISS for years. There are other APRS satellites which are intermittently active on the same frequency, and I expect there will be others in the future. I can't address the formal coordination issue, but anything with an uplink on that frequency is guaranteed to have problems. The only question is whether those problems are tolerable. There is little to no APRS activity on that frequency over most of the world, and then there is the question of both HO-68 and the ISS being in the same footprint. The HO-68 has an inclination of about 102 degrees, the ISS about half that. Finally, the ISS is not active on that frequency 24/7. It operates on other frequencies for voice and SSTV, and is often QRT completely due to other operations. In an imperfect world, it looks like a reasonable tradeoff, though other evaluations are certainly possible. The problem of unattended APRS beacons does cut both ways. There are some daylight-only APRS satellites. When they enter periods of extended illumination, they can be commanded from their default modes. However, even a single "braaap" can pull the DC busses low enough that the command stations need to start over again. WB4APR has lamented this problem, with specific calls, in other venues. Looking at some of the paths, both in Drew's example and my reception, there are stations whose paths have not been updated for years. The sort of courtesy/coordination issue is not limited to space operations. A ham relatively local to me fired up a propagation beacon on 30 meters this month. It is/was within 200 HZ of an APRS frequency which has been in use for some time. Quite a fight over who "owns" the frequency. ;) 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 ___ 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: AO-51 short experiment
Bob, 145.825 is the "established" space APRS frequency, and has been/is used by more than just the ISS for years. There are other APRS satellites which are intermittently active on the same frequency, and I expect there will be others in the future. I can't address the formal coordination issue, but anything with an uplink on that frequency is guaranteed to have problems. The only question is whether those problems are tolerable. There is little to no APRS activity on that frequency over most of the world, and then there is the question of both HO-68 and the ISS being in the same footprint. The HO-68 has an inclination of about 102 degrees, the ISS about half that. Finally, the ISS is not active on that frequency 24/7. It operates on other frequencies for voice and SSTV, and is often QRT completely due to other operations. In an imperfect world, it looks like a reasonable tradeoff, though other evaluations are certainly possible. The problem of unattended APRS beacons does cut both ways. There are some daylight-only APRS satellites. When they enter periods of extended illumination, they can be commanded from their default modes. However, even a single "braaap" can pull the DC busses low enough that the command stations need to start over again. WB4APR has lamented this problem, with specific calls, in other venues. Looking at some of the paths, both in Drew's example and my reception, there are stations whose paths have not been updated for years. The sort of courtesy/coordination issue is not limited to space operations. A ham relatively local to me fired up a propagation beacon on 30 meters this month. It is/was within 200 HZ of an APRS frequency which has been in use for some time. Quite a fight over who "owns" the frequency. ;) 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: AO-51 short experiment
At 11:09 AM 10/24/2010 -0700, Bob Herrell wrote: >Any chance we could get the ISS to change their packet frequency? > >73, >Bob Herrell >AJ5C No, The APRS QRM'ers with their unattended beacons are the problem. Years ago I said APRS was bad, but I never thought it would ever get this bad. Things definitely aren't like they were in the MIR days, when you could make multiple contacts a pass with minimal equipment. I could build a setup for packet that every single one of my packets would get through, but what good would the do? So I could have a QSO with myself? So I give up. The APRS'ers should build a dedicated satellite just for APRS, and their QRM should be limited to just that one satellite, unless they won't to build more. Hell, I'd even donate to it just to clean things up! KB7ADL ___ 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: AO-51 short experiment
Any chance we could get the ISS to change their packet frequency? 73, Bob Herrell AJ5C From: Andrew Glasbrenner To: amsat-bb Sent: Sat, October 23, 2010 5:13:29 PM Subject: [amsat-bb] Re: AO-51 short experiment And now back to normal. Lots of folks are running unattended beacons on 145.825, which can cause QRM to HO-68 FM users. I only decoded about half of those heard: 21:59 HP1AVS-4/WIDE2-2>P8SS1X>UI,R,F0 (1199 baud): 'kPUl .-/]DIGIPEATER en Gorgona 22:00 K4MQF/WIDE2-2>RS0ISS-4>UI,R,F0 (1200 baud): =3811.25N/07746.23W`PHG52306/Greeting to all ! from Spotyslvania Va 22:00 AB5JO/RELAY/WIDE>GPSC30>UI,R,F0 (1200 baud): 73 VIA ARISS DE AB5JO MOBILE IN LAREDO,TX, USA EL07 22:00 AB5JO/RELAY/WIDE>GPSC30>UI,R,F0 (1200 baud): $GPRMC,220035,A,2734.3349,N,09930.1045,W,000.0,195.8,231010,,,A*6C 22:01 AB5JO/RELAY/WIDE>GPSC30>UI,R,F0 (1200 baud): 73 VIA ARISS DE AB5JO MOBILE IN LAREDO,TX, USA EL07 22:01 AB5JO/RELAY/WIDE>GPSC30>UI,R,F0 (1200 baud): $GPRMC,220135,A,2734.3349,N,09930.1045,W,000.0,195.8,231010,,,A*6D 22:04 N1NCB1-14/W3ADO-1/ARISS>4S3T6X>UI,?,F0 (1194 baud): `b2Fp4V[/"3y} 22:04 WA1KAT/RS0ISS-4/SGATE/WIDE>BEACON>UI,?,F0 (1199 baud): =4239.70N/07057.02W-Topsfield,MA 5w vertical 22:04 W9QO/ARISS/SGATE/WIDE2-2>STPX2U>UI,R,F0 (1199 baud): 'oIrl!e-/]"6Y} 22:05 K4MQF/WIDE2-2>RS0ISS-4>UI,R,F0 (1200 baud): =3811.25N/07746.23W`PHG52306/Greeting to all ! from Spotyslvania Va 22:05 VE3FFR/W3ADO-1/SGATE/WIDE>APRS>UI,R,F0 (1199 baud): !4416.01N/07629.01W- 22:05 W9QO/ARISS/SGATE/WIDE2-2>STPX2U>UI,R,F0 (1199 baud): 'oIrl!e-/]"6Y} There was a little gap there in the middle where I swapped over to the 435.300 repeater, and gaps at each end. 73, Drew KO4MA AMSAT-NA VP Operations -Original Message- >From: Andrew Glasbrenner >Sent: Oct 23, 2010 4:35 PM >To: amsat-bb >Cc: "marklhamm...@gmail.com" >Subject: [amsat-bb] AO-51 short experiment > >>From 2025UTC this afternoon, for 1-2 orbits, the 435.150 downlink on AO-51 is >>configured as a repeater and being used to monitor 145.825. Please DO NOT >>attempt to transmit through this downlink! We are taking a look at congestion >>and unattended operation that may be impacting the use of HO-68 in FM mode. >>Reception reports are of course welcome. > >73, Drew KO4MA >AMSAT-VP Operations > > >___ >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
[amsat-bb] FW: [ans] ANS-297 AMSAT Weekly Bulletins
AMSAT NEWS SERVICE ANS-297 ANS is a free, weekly, news and information service of AMSAT North America, The Radio Amateur Satellite Corporation. ANS reports on the activities of a worldwide group of Amateur Radio operators who share an active interest in designing, building, launching and communicating through analog and digital Amateur Radio satellites. Please send any amateur satellite news or reports to: ans-edi...@amsat.org In this edition: * LightSail Backup Being Built * ARISS Status - 18 October 2010 * FO-29 Eclipses * Minutes of BOD meeting * Call for Papers SE VHF Society SB SAT @ AMSAT $ANS-297.01 LightSail-1 Backup Being Built AMSAT News Service Bulletin 297.01 From AMSAT HQ SILVER SPRING, MD. October 24, 2010 To All RADIO AMATEURS BID: $ANS-297.01 Louis Friedman, program director for LightSail-1, has announced that a back-up craft to LightSail-1 will be built, instead of an investment in insurance for an estimated cost of $ 200,000. As previously announced in July 2010 by AMSAT News Service (SB SAT @ AMSAT $ANS-206.08) LightSail-1 is planned to be launched in early 2011. LightSail-1 is a three Cubesat spacecraft (size of shoebox and proposed AMSAT Fox). It will use UHF frequencies for tracking and command control stations. California Polytechnic University is supplying the Cubesat bus, avionics and launch vehicle P-POD interface;. Georgia Tech University is leading the mission operations, Dave Spencer serving as mission manager; Stellar Exploration, Inc. led by Tomas Svitek is building LightSail-1; Jim Cantrell of Strategic Space Systems is project manager; and Louis D. Friedman is the LightSail-1 program director. The LightSail-1 program will be featured this weekend in Washington D.C. The USA Science & Engineering Festival National Mall in Washington, D.C. October 23 & 24, 1010 10am to 5:50pm http://www.planetary.org/programs/projects/space_information/usa_science_fes tival_2010.html For further information on this Planetary Society program: http://www.planetary.org/programs/projects/innovative_technologies/solar_sai ling/ [ANS thanks Greg, W9GB, for the above information] /EX SB SAT @ AMSAT $ANS-297.02 ARISS Status - 18 October 2010 AMSAT News Service Bulletin 297.02 From AMSAT HQ SILVER SPRING, MD. October 24, 2010 To All RADIO AMATEURS BID: $ANS-297.02 1. School Contact in Australia An Amateur Radio on the International Space Station (ARISS) contact for Carine Primary School in Perth, Western Australia, Australia was held on Tuesday, October 19 at 07:06 UTC via telebridge station WH6PN in Hawaii. The school has incorporated the contact into its science curriculum. Guest speakers present included representatives from an amateur radio club and the science center, Scitech. Students from Kindergarten through grade 7 have been involved in research and other activities in preparation for this event, using IT and online resources, including the NASA Web site. 2. George Observatory Contact Successful On Saturday, October 16, an Amateur Radio on the International Space Station (ARISS) contact was held with scouts and astronomy club members attending the Astronomy Day event at George Observatory in Needville, Texas. This was a telebridge contact via station WH6PN in Hawaii. Approximately 150 people attended and listened as Doug Wheelock, KF5BOC answered 12 questions about life in space posed to him by the youth. As part of the event, scout troops set up an amateur radio station near the observatory to conduct their all-day Jamboree on the Air (JOTA) radio contacts and also worked on Radio Merit Badges. The Brazos Valley Amateur Radio Club was on hand to assist with JOTA activities and prepared for afternoon satellite contacts with an Arrow hand-held antenna. 3. ARRL Article on ARISS Contacts The American Radio Relay League (ARRL) ran a story on recent ARISS contacts including those with Windsor Central School District, Utah Scouts and IRSEA, as well Doug Wheelock's many general contacts. The article, written by Rick Lindquist, WW3DE may be found at: http://www.arrl.org/news/iss-astronaut-creating-ham-radio-buzz-taking-scienc e-to-students 4. Amateur Radio Newsline Covers ARISS On October 15, the Amateur Radio Newsline Report 1731 included two ARISS related stories. "Ham Radio in Space: ARISSat-1 Enroute to Russia" announces ARISSat's arrival at JSC and its planned shipment to Russia. "Challenger Learning Center Inaugurates Ham Station" is about the station set up at the CLC in Oregon, Ohio to get students interested in STEM studies. Both stories may be found at: ftp://ftp.arnewsline.org/quincy/News/news.txt 5. ARISSat-1 Safety Review Held The Johnson Space Center Payload Safety Review Panel performed a Phase 2 flight safety review of ARISSat-1 on Wednesday and Thursday, October 13 and 14 in Houston. ARISSat passed the review with modifications to the hazard reports. As soon as the updates requested are incorporated, the hazard r
[amsat-bb] FO-29 Status now
Hi FO-29 users JARL FO-29 command team announced that FO-29 has turned off the transponder because it doesn't obtain enough durations of sunshine now. The FO-29 analog transmitter was not able to be turned on by the analog transmitter ON commands which were sent from command team on 10/17 08:53(UTC) 10/23 18:42(UTC) 10/23 20:23(UTC) 10/24 07:40(UTC). This announcement is written by Japanese and I did translate into English. Hope she will return back to us. JA1COU ___ 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: FO-29 status now
On Sun, October 24, 2010 04:03, Mineo Wakita wrote: Hi Mineo, > The strenuous repair work continues every day by a control station > to return in FO-29 transponder. JARL grand station says that the > command was not able to transmit even a pass of 18:46 UTC, 23 Oct, > so we will try again the transmission of the command with the pass > at 20:32 UTC, 23 Oct, and 07:45 UTC, 24 Oct. Thanks for the update, can other amateurs help or give information to the people from the command centre. Maybe telemetry information or signal strength? > JE9PEL, Mineo Wakita > 73 PE0SAT, Jan ___ 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] Helix Antenna's Twist
23rd October 2010 N8MH de S.I., Mark, Your recent message to Tom, K0TW, in respect to the polarization of a helical antennae is not 100% correct. You state, quote: "How do you determine the resulting polarity of the [helical] antenna? My response: when standing at the rear, does the cork-screw go clockwise or counter-clockwise as it spirals away from you? That is the visible difference, if building a helix. " unquote: Implicit in your answer (but not defined) is that a Right-hand helix, when viewed from behind, spirals away from you in a clockwise direction, the same as a standard screw thread. That statement is true for the classical helical antenna, /á la Kraus/. However it is not true for the Quadrifilar Helix design, which twists in the opposite direction to the classical helix. Maybe people who do not know the difference, and unwittingly build one with the twist in the wrong direction, get such very bad performance when attempting to use it and complain bitterly that "the Quad Helix does not work". 73s,de John G3BVU/W1, Spectrum International, Inc. ___ 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
