[amsat-bb] Re: 2.4GHz broadband router on satellite?
Lee Maisel wrote: James French wrote: What are the possibilities of building a satellite that uses a Linksys WRT54GL router with a modified DD-wrt or HSMM-Mesh software as a store and forward BBS, to route a received request from one station to another station, or even to connect to a on board networked camera to receive images? What kind of uplink power would be needed from the home station? How fast could the speed(s) get theoretically? How big would the antenna have to be on the craft and for the ground station to even be able to do this adequately? Would the doppler be too much to even consider this? Would the space environment be too harsh for something like this? This is just something I was thinking about this morning and thought I would toss it out. James W8ISS ___ THAT is an AWESOME Idea! I don't see why it wouldn't work, I don't know if doppler is an issue though, it may not be if the modulation is FM. The antenna would not have to be big, it's 2.4Ghz Why don't you post this on the HSMM-MESH.org web forums and get ideas? 73 Lee W5LMM Hi James, Lee, If you are thinking of using standard Wi-Fi as the link protocol, be aware that the timers that drive the protocol don't well work over long distances (few miles). Something about the speed of light not being fast enough. Real bummer. These would need to be adjusted, though I think the implications for a point-point connection may not be too severe. Besides doppler shift, which could be a problem depending on how agile the ground station is, the modulation scheme (it's NOT simply FM) uses about 20 mhz of bandwidth, so you will need significant power to get the 20db S/N needed to decode anything halfway reliably. Remember, a typical AP runs 100mw on 2.4 ghz, and gets reliable communication over distances of 100's of FEET with omni antennas. Add some gain on both ends (so now you need attitude control on the satellite!), and you can go a few miles. But 100's of miles to orbit? I need someone to "do the numbers", but I bet it's not too good. Greg KO6TH ___ Sent via AMSAT-BB@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] CO-55 UHF beacon stuck?
Hello, This is to report that CO-55 seems to be stuck with a 100% duty cycle carrier on 436.825 MHz. The CW beacon was not operational during the 2013-02-22 02:07z pass over Northern California, instead a constant carrier was heard during the entire pass, maximum signal S8. Receiving station: FT-817ND, AD6IW 25dB 0.3NF preamp, Arrow antenna, Arduino-controlled rotator, Orbitron tracking/doppler software Not sure if this is a recent issue or not on this satellite. Is anyone from Tokyo Institute of Technology on this list? 73 de Bernard KI6TSF ki6tsf at amsat.org ___ Sent via AMSAT-BB@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: 2.4GHz broadband router on satellite?
One of the recent 3u DOD sponsored cubes has a S dish for tracking wifi type tags on containers. I'm not sure how much lick they had with that. 73, Drew KO4MA Sent from my iPhone On Feb 21, 2013, at 7:58 PM, Lee Maisel wrote: > James French wrote: >> What are the possibilities of building a satellite that uses a Linksys >> WRT54GL router with a modified DD-wrt or HSMM-Mesh software as a store >> and forward BBS, to route a received request from one station to another >> station, or even to connect to a on board networked camera to receive >> images? >> >> What kind of uplink power would be needed from the home station? >> >> How fast could the speed(s) get theoretically? >> >> How big would the antenna have to be on the craft and for the ground >> station to even be able to do this adequately? >> >> Would the doppler be too much to even consider this? >> >> Would the space environment be too harsh for something like this? >> >> This is just something I was thinking about this morning and thought I >> would toss it out. >> >> James W8ISS >> >> ___ > THAT is an AWESOME Idea! > > I don't see why it wouldn't work, I don't know if doppler is an issue though, > it may not be if the modulation is FM. > The antenna would not have to be big, it's 2.4Ghz > > > Why don't you post this on the HSMM-MESH.org web forums and get ideas? > > 73 > Lee > W5LMM > > > -- > > > ΜΟΛΩΝ ΛΑΒΕ > > ___ > Sent via AMSAT-BB@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-BB@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: 2.4GHz broadband router on satellite?
James French wrote: What are the possibilities of building a satellite that uses a Linksys WRT54GL router with a modified DD-wrt or HSMM-Mesh software as a store and forward BBS, to route a received request from one station to another station, or even to connect to a on board networked camera to receive images? What kind of uplink power would be needed from the home station? How fast could the speed(s) get theoretically? How big would the antenna have to be on the craft and for the ground station to even be able to do this adequately? Would the doppler be too much to even consider this? Would the space environment be too harsh for something like this? This is just something I was thinking about this morning and thought I would toss it out. James W8ISS ___ THAT is an AWESOME Idea! I don't see why it wouldn't work, I don't know if doppler is an issue though, it may not be if the modulation is FM. The antenna would not have to be big, it's 2.4Ghz Why don't you post this on the HSMM-MESH.org web forums and get ideas? 73 Lee W5LMM -- ΜΟΛΩΝ ΛΑΒΕ ___ Sent via AMSAT-BB@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: Personal Best on AO7-b
Well done Frank! Hope to hear you again soon. 73, Eric. Amateur Radio Station ON4HF Eric Knaps Satellite manager UBA http://www.on4hf.be - Oorspronkelijk e-mail - Van: "K4FEG" Aan: amsat-bb@amsat.org Verzonden: Donderdag 21 februari 2013 20:22:07 Onderwerp: [amsat-bb] Personal Best on AO7-b Today at 18:59UTC myself, (K4FEG EM55aj) and Jari, OH2FQV (KP20mf), had a successful 2way CW contact on AO7-b both signals were 559 with approximately 1 degree (or less) of elevation on both sides of the pass. The calculated distance on this QSO is approximately 7862Km based on a couple of calculation programs. Jari has an excellent station for low elevation operations and can hear to LOS with ease. THANK YOU JARI FOR YOUR PATIENCE AND PERSISTENCE! Frank E. Griffin; K4FEG EM55aj ___ Sent via AMSAT-BB@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-BB@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: Personal Best on AO7-b
Great effort Frank!! keep trying! 73 Bob W7LRD - Original Message - From: "K4FEG" To: amsat-bb@amsat.org Sent: Thursday, February 21, 2013 11:22:07 AM Subject: [amsat-bb] Personal Best on AO7-b Today at 18:59UTC myself, (K4FEG EM55aj) and Jari, OH2FQV (KP20mf), had a successful 2way CW contact on AO7-b both signals were 559 with approximately 1 degree (or less) of elevation on both sides of the pass. The calculated distance on this QSO is approximately 7862Km based on a couple of calculation programs. Jari has an excellent station for low elevation operations and can hear to LOS with ease. THANK YOU JARI FOR YOUR PATIENCE AND PERSISTENCE! Frank E. Griffin; K4FEG EM55aj ___ Sent via AMSAT-BB@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-BB@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] FRETS1 Ion Motor Powered Satellite at Tampa Bay Mini Maker Faire
See http://www.amsat-uk.org/?p=12853 73 Trevor M5AKA ___ Sent via AMSAT-BB@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] Personal Best on AO7-b
Today at 18:59UTC myself, (K4FEG EM55aj) and Jari, OH2FQV (KP20mf), had a successful 2way CW contact on AO7-b both signals were 559 with approximately 1 degree (or less) of elevation on both sides of the pass. The calculated distance on this QSO is approximately 7862Km based on a couple of calculation programs. Jari has an excellent station for low elevation operations and can hear to LOS with ease. THANK YOU JARI FOR YOUR PATIENCE AND PERSISTENCE! Frank E. Griffin; K4FEG EM55aj ___ Sent via AMSAT-BB@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: Orbitron on Windows 7
I have the same problem down here and have to open Task Manager to forcefully end Orbitron. I would like to hear if there is a better solution. 73 Thu XV9AA Hello Thu (and all others on the list) Now things are working here. I post some of the advice i got off list that helped me get it running. (maybe help someone else) *Don't install Orbitron to the default location. Save it somewhere like C:\Orbitron so that it can write changes and you can edit the files. Also set it to run as Administrator and if you are still having problems set it to run in compatibility mode for windows XP I'm running windows 7 and running it as Admin fixed the problem. *I think you have to install it by right clicking on the installation file and select run as administrator, and you might have to do the same to run the program under win 7. I use a shortcut on my PC that I set to run as administrator in the shortcuts properties *I have fixed a similar problem by running it in XP Compatibility mode. Look under the Properties for the icon. This helped me to get at really nice program running also on my new computer. 73 de Hakan SM7WSJ ___ Sent via AMSAT-BB@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: Orbitron on Windows 7
Hakan, I have the same problem down here and have to open Task Manager to forcefully end Orbitron. I would like to hear if there is a better solution. 73 Thu XV9AA -Original Message- From: Håkan H [mailto:sm7...@telia.com] Sent: Wednesday, February 20, 2013 3:28 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Orbitron on Windows 7 Hello! I run Orbitron on a XP machine with very good result. Problem is when i try to run it on a Win 7 laptop it rejects to close down. I remember last year there where some writing about problem with this combination. Any good result out there? 73 Hakan SM7WSJ ___ Sent via AMSAT-BB@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
