[amsat-bb] Re: Happy 5th Birthday to HAMSAT
Hi Domenico Thanks for the flowers. Hopefully we can get some more linear transponders in orbit in the future. Besides the small mode-UV that I have here on the shelf I am working on a mode-LS version as well (CubeSat size ofcourse). Also on my bench is a credit card sized 2m-70cm FM transponder, which still needs some time to get finalized. 73 de PE1RAH William Leijenaar >> Hi Hamsat Team, >> >> Thanks for building this great Amateur Satellite it is always a pleasure >> to hear and work this great bird. I think when somebody will ask me what >> my favorite linear transponder Satellite is VO-52 will be the first one >> that crosses my mind. >> >> And as somebody already mentioned, lets hope it will be working for >> another long time. >> >> >> I'll buy some cake and candles to celebrate here birthday :)) >> >> 73 Jan PE0SAT >> > >Hi Jan, PE0SAT > >A great tanks also to William Leinejar PE1RAH who designed and built the >Dutch transponder on board of VO-52. > >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: PC clock
Hello Mark, Domenico and others, when SatPC32 updates the antenna positions it turns the antennas a half step in front of the satellites position. The manual says: "Under all tracking options, the rotors are activated with a precession of one half step, either one half of the time interval or one half of the tracking angle, to ensure that the satellite moves through the antenna focus." 73s, Erich, DK1TB - Original Message - From: "Mark L. Hammond" To: "i8cvs" Cc: "AMSAT-BB" ; Sent: Tuesday, May 11, 2010 10:25 PM Subject: [amsat-bb] Re: PC clock Hello Domenico, The very excellent SatPC32 program "leads" so as to keep an accurate pointing at a satellite. It has several adjustments for how often the rotors are updated, gain consideration of the antennas in use, etc. 73, Mark N8MH On Tue, May 11, 2010 at 4:07 PM, i8cvs wrote: > - Original Message - > From: "Greg D." > To: > Cc: > Sent: Tuesday, May 11, 2010 7:47 AM > Subject: [amsat-bb] Re: PC clock >> >> Hi Larry, >> >> Ok, I understand the need for an accurate clock, though I believe you're >> expectations for being able to track an overhead pass is pushing the >> limits of orbital prediction pretty hard. Another ham I know locally >> tried this, and ultimately gave up. His issue was not one of clock >> accuracy, but of Keps and the mathematics behind them. >> >> >> Greg KO6TH >> > Hi Greg, KO6TH > > When the software calculate the Az and the El of the satellite at the > right > time with an accurate clock then it send a command to the rotators but the > antennas takes a certain time to go in that calculated position and when > the > antennas are finally there then the satellite is already in another > position > far advanced in it's orbital path particularly when the satellite pass is > overhead. > > I dont think you want to run the motors every 5 or 10 seconds othervise > your > control relays will work as a machine-gun > > So the issue is not on clock accuracy or Keps or mathematics behind them > but > it is on the tracking system that we normally use to mimichaise the > satellite position with a phase difference between the satellite > calculated > position and the actual antenna position when the traching command is sent > to the motors. > > If you go over the roof and you follow the ISS by naked eye you will > realize > that your antenna pointing is always a little bit behind the ISS position > in > the sky and so a very accurate clock to track a LEO satellite is meaning > less particularly using high gain antennas with a narrow main lobe. > > 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 > -- Mark L. Hammond [N8MH] ___ 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] Long Distance Software Patch
Voyager II is bit-flipping, engineers will attempt a fix from 8.6 billion miles away. Transmission delay is 13 hours. Wow. http://www.spaceflightnow.com/news/n1005/11voyager2/ Rich, N8UX ___ 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: Happy 5th Birthday to HAMSAT
At 06:41 PM 5/12/2010, William Leijenaar wrote: >Hi Domenico > >Thanks for the flowers. > >Hopefully we can get some more linear transponders in orbit in the future. Look forward to it, just getting 70cm SSB up and running here. I suspect that I will be using this mode almost exclusively for satellite operation. 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] Re: PC clock
Hi Herich, DK1TB When manually tracking a LEO satellite beginning from OSCAR-6 I realized the same trick to point the antennas with an angle 5 to 10 degree in front of the satellite position. The same technique is used by hunters to shoot down birds. 73" de i8CVS Domenico - Original Message - From: "Erich Eichmann" To: "Mark L. Hammond" Cc: Sent: Wednesday, May 12, 2010 10:50 AM Subject: [amsat-bb] Re: PC clock > Hello Mark, Domenico and others, > when SatPC32 updates the antenna positions it turns the antennas a half step > in front of the satellites position. The manual says: > > "Under all tracking options, the rotors are activated with a precession of > one half step, either one half of the time interval or one half of the > tracking angle, to ensure that the satellite moves through the antenna > focus." > > 73s, Erich, DK1TB > > - Original Message - > From: "Mark L. Hammond" > To: "i8cvs" > Cc: "AMSAT-BB" ; > Sent: Tuesday, May 11, 2010 10:25 PM > Subject: [amsat-bb] Re: PC clock > > > Hello Domenico, > > The very excellent SatPC32 program "leads" so as to keep an accurate > pointing at a satellite. It has several adjustments for how often the > rotors are updated, gain consideration of the antennas in use, etc. > > 73, > > Mark N8MH > > On Tue, May 11, 2010 at 4:07 PM, i8cvs wrote: > > - Original Message - > > From: "Greg D." > > To: > > Cc: > > Sent: Tuesday, May 11, 2010 7:47 AM > > Subject: [amsat-bb] Re: PC clock > >> > >> Hi Larry, > >> > >> Ok, I understand the need for an accurate clock, though I believe you're > >> expectations for being able to track an overhead pass is pushing the > >> limits of orbital prediction pretty hard. Another ham I know locally > >> tried this, and ultimately gave up. His issue was not one of clock > >> accuracy, but of Keps and the mathematics behind them. > >> > >> > >> Greg KO6TH > >> > > Hi Greg, KO6TH > > > > When the software calculate the Az and the El of the satellite at the > > right > > time with an accurate clock then it send a command to the rotators but the > > antennas takes a certain time to go in that calculated position and when > > the > > antennas are finally there then the satellite is already in another > > position > > far advanced in it's orbital path particularly when the satellite pass is > > overhead. > > > > I dont think you want to run the motors every 5 or 10 seconds othervise > > your > > control relays will work as a machine-gun > > > > So the issue is not on clock accuracy or Keps or mathematics behind them > > but > > it is on the tracking system that we normally use to mimichaise the > > satellite position with a phase difference between the satellite > > calculated > > position and the actual antenna position when the traching command is sent > > to the motors. > > > > If you go over the roof and you follow the ISS by naked eye you will > > realize > > that your antenna pointing is always a little bit behind the ISS position > > in > > the sky and so a very accurate clock to track a LEO satellite is meaning > > less particularly using high gain antennas with a narrow main lobe. > > > > 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 > > > > > > -- > Mark L. Hammond [N8MH] > > ___ > 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] Atlantis launch at Dayton?
Anybody going to setup NASA TV at Dayton? Bill KW8KW ___ 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] Call for Papers--2010 ARRL/TAPR Digital Communications Conference
Technical papers are solicited for presentation at the 29th Annual ARRL and TAPR Digital Communications Conference to be held September 24-26, 2010 in Portland, Oregon. These papers will also be published in the Conference Proceedings (you do NOT need to attend the conference to have your paper included in the Proceedings). The submission deadline is July 31, 2010. Please send papers to: Maty Weinberg ARRL 225 Main St Newington, CT 06111 or you can make your submission via e-mail to: m...@arrl.org Papers will be published exactly as submitted and authors will retain all rights. 73 . . . Steve, WB8IMY ARRL ___ 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] Tone on AO-51?
May 10 - May 16 FM Repeater, V/S Uplink: 145.880 MHz FM Downlink: 2401.200 MHz FM 67 Hz PL Tone Required I work it without the PL tone this morning 0539 EDT pass. Is the tone is present only when AO-51 is in eclipse? "-" Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE ___ 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: Tone on AO-51?
Luc Leblanc wrote: > May 10 - May 16 > > FM Repeater, V/S > Uplink: 145.880 MHz FM > Downlink: 2401.200 MHz FM > 67 Hz PL Tone Required > > I work it without the PL tone this morning 0539 EDT pass. Is the tone is > present only when AO-51 is in eclipse? > > I had intended to use the tone access on V/S this week. Although the PL will not PTT the S transmitter, the quiet carrier makes the downlink easier to find, and there are not so many users to make that type of PL access problematic. However, the V/S entry in the automatic scheduler does not include PL, and since the scheduler is now what is making V/S possible, there is no PL. Long story short, we intended to, but couldn't due to a change in procedure. I'll fix the Command Team webpage right now. 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] AMSAT stamps 100% to AMSAT
In the spirit of the Dayton $5000 challenge I am offering on Ebay my AMSAT framed stamps. 100% of the proceeds go to AMSAT. I expect nothing less than a spirited bidding battle for these stamps. http://shop.ebay.com/?_from=R40&_trksid=p3984.m570.l1313&_nkw=amsat+stamps&_sacat=See-All-Categories 73 Bob W7LRD ___ 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: Atlantis launch at Dayton?
>From NASA website 5/12 @ 15:37 EDT: NASA Managers 'Go' for Friday Launch Wed, 12 May 2010 11:35:58 AM EDT Wednesday is "L-2" at NASA's Kennedy Space Center in Florida, meaning there are only two days remaining until the scheduled launch of space shuttle Atlantis on its STS-132 mission. Countdown clocks across the launch complex were activated at 4 p.m. EDT Tuesday and the countdown continues on schedule for liftoff Friday at 2:20 p.m. de Bill --- On Wed, 5/12/10, Bob McGwier wrote: From: Bob McGwier Subject: Re: [amsat-bb] Atlantis launch at Dayton? To: "Bill ONeil" , amsat-bb-boun...@amsat.org, "amsat bb" Date: Wednesday, May 12, 2010, 3:11 PM The launch is seriously postponed as in already confirmed by nasa right? Bob N4HY Sent from my Verizon Wireless BlackBerry -Original Message- From: Bill ONeil Date: Wed, 12 May 2010 05:46:06 To: Subject: [amsat-bb] Atlantis launch at Dayton? Anybody going to setup NASA TV at Dayton? Bill KW8KW ___ 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] Office
The AMSAT Office will be closed through Monday, May 17th. I will be attending the Dayton Hamvention. -- 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] ao 51 V/S
Hello... I heard some QSOs on S band on the last pass...I have had to repair my connection to the dish to receive the down link signal. I was successful to hear some signals from the L48. I could not make out the call signs but it is encouraging.. I will keep on trying. W7LRD,.Bob.. I will be looking for you. 73, Dale KL7XJ ___ 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] S band cavity filter test
With AO-51 in mode V/S i start to test a wave guide filter model ITS 1653C made by ITS corporation Mc Murry PA. The wave guide centered on 2401Mhz with a band pass covering 2400 to 2402Mhz with a very low insertion loss. The first test made on my last AO-51 pass confirm all the qrm out of the passband if effectively reduced a lot. More test will be needed to confirm if the filter effectively help my AIDC downconverter reception P.S. when i dismantle the antenna coax from the AIDC connector i saw the N female connector full of white rust. Even with a carefull taping only the antenna connector show this type of corosion. I suspect the N male adaptor and the is made of a different alloy than the AIDC N connector. After one year at the top of the tower the corrosion take his toll and it will a good thing to check your AIDC downconverter connector condition. I don't know how i was able to hear on 2401mhx with a so white powder rusted connector? "-" Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE ___ 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: Atlantis launch at Dayton?
The launch is seriously postponed as in already confirmed by nasa right? Bob N4HY Sent from my Verizon Wireless BlackBerry -Original Message- From: Bill ONeil Date: Wed, 12 May 2010 05:46:06 To: Subject: [amsat-bb] Atlantis launch at Dayton? Anybody going to setup NASA TV at Dayton? Bill KW8KW ___ 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: Hitting a southbound Moon
- Original Message - From: "Greg D." To: Sent: Sunday, April 25, 2010 8:34 PM Subject: [amsat-bb] Hitting a southbound Moon > > Hi folks, > > Now that the Arecibo event is behind us, there is still one puzzle that > I'd like someone to explain to me. How do I aim at the Moon? > > I'm on the US West Coast. Early in the pass on Saturday, both Predict and > Orbitron told me that the Moon's azimuth from here should be slightly > north of east. It was in the 80-ish degree range, with east, of course, > being 90. > > But looking at Orbitron's map display, the Moon was clearly south of my > latitude. As the pass progressed, the >Moon moved westward on the map, > making a sharper angle to the south of east from here. Both Predict and > Orbitron's Az calculation increased too (eventually crossing 90 degrees), > but always seemed to be north of where >the Moon was. > > Why would I aim north to hit a southbound Moon? > > Greg KO6TH > Hi Greg, KO6TH It was only the Sub Satellite Point SSP of the Moon south of your latitude on the earth surface i.e. the map display but the Moon as seen from your locator was north of your latitude over the celestial sphere up in the sky and this is why you aim north the antennas to hit the Moon even if her SSP on the map has a southbound path. 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
