[amsat-bb] Re: ISS Message Board,
Hi It was so interesting to work ISS BBS over Africa :) ( Only You ) http://www.amsat.org/amsat/archive/amsat-bb/200901/msg00853.html More interest than ISS was AO-51 9k6 Pacsat mode . I really miss it. http://www.st2nh.com/photos 73's Nader ___ 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: ISS Message Board
On Mon, 25 Jul 2011 19:30:50 -0400 Diane Bruce d...@db.net wrote: On Mon, Jul 25, 2011 at 03:43:03PM -0700, Ted wrote: Curious.. If Gordon (always ready with a cheerful comment) is accurate, then what is the purpose of the BBS? Also, Kevin is far from 'selfish'...he is just using The BBS is a side effect of the commercial equipment (Kenwood) they took up there. Many of us do think it should be disabled. Time for a quick description, for those who may be less familiar with how packet BBSes work. Many of us are running packet radio BBSes or even just mailboxes, on modern computing hardware. Now this hardware with 16- and 32-bit processors running at clock speeds of over 100MHz, up to a megabyte or even more of RAM and maybe as much as a couple of gigabytes (that's 1024 megabytes) of mass storage is often capable of handling many simultaneous connections. Users can send messages to each other directly or via mailboxes, while other users are simultaneously reading messages or browsing saved bulletins - perhaps as many as eight users at once! By comparison, the 8-bit 4MHz microprocessors used in most normal TNCs can really only cope with a single connection at a time. Once someone is in connected mode, everything else gets rejected. Some of the more modern TNCs can accept very large amounts of RAM (the KPC-3 can have 32 kilobytes), but most have much less than that. The TNCs built into radios tend to be fairly simpleminded beasts, with crude firmware and very little RAM for storing messages and connections. The UI packets, on the other hand, are merely received and, if they are valid, repeated (almost verbatim) a moment later. There is a slight modification to the header to indicate that they've been through a digipeater, but the message content remains unmodified. Since the TNC has no need to track any state for these packets - UI is not a connected mode - then it can handle digipeating packets for any stations it can hear. the available resources. Helpful education is far more useful than lame name It's the way Gordon is, he's a nice chap online (on IRC). Don't take it the wrong way. The pair of you should go have a beer together or something. He's just a typical dour direct Scot, but he will drink you under the table. ;-) Thanks, that's the nicest thing anyone's said all day. -- Gordon JC Pearce gordon...@gjcp.net ___ 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: ISS Message Board
...he is just using the available resources. I too thought the amateur digital radio equipment on ISS are resources we all can use. I'm sure all of us would not knowingly hog it up for our own benifitI mean, what's the point, right? I agree with Bob in that using the BBS is so resource intensive. With digi (non BBS) you get immediate responses and does not clog up traffic. I've used the ISS digi on occasion and it's satisfying to receive a short message back right away. I thought it was very similar to a FM voice contact, but chat room style! Have a great day folks! 73's Peter VE7NGP ___ 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: ISS Message Board
At 12:21 PM 7/26/2011, you wrote: ...he is just using the available resources. I too thought the amateur digital radio equipment on ISS are resources we all can use. I'm sure all of us would not knowingly hog it up for our own benifit... Me too but I'm a bit confused for what. Some seem to use it to post that APRS location Others (who seem to be limited to VHF UHF) are trying way way to hard to work DX. I may be wrong but they are the reason I have given up completely on it. John, W0JAB John, W0JAB ___ 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: ISS Message Board
Curious.. If Gordon (always ready with a cheerful comment) is accurate, then what is the purpose of the BBS? Also, Kevin is far from 'selfish'...he is just using the available resources. Helpful education is far more useful than lame name calling, Gordon. Ted, K7TRK -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Gordon JC Pearce Sent: Sunday, July 24, 2011 6:46 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: ISS Message Board On Sun, 24 Jul 2011 05:07:16 -0700 Kevin Deane summit...@live.com wrote: Good morning Jeremy, saw your message but she fell out of veiw...Thanks KG6NUG for the cool flag that came up on my end anyway!! Glad to see active people and not BEACONS using the ISS Digi. Dont get me wrong, they serve their purpose... The problem is that when you use the packet BBS on the ISS, it stops digipeating packets for anyone else. So, for that entire pass, you're the only person who can work the ISS. Don't be selfish. -- Gordon JC Pearce MM0YEQ gordon...@gjcp.net ___ 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: ISS Message Board
If Gordon ... is accurate, then what is the purpose of the BBS? None practically. It is the most inefficient AX.25 packet arrangement possible. AX.25 connected packet depends on line-by-line ACKS. This works on a two-way balanced link when both stations hear each other reliably and without interference. But the Earth to ISS path is anything but balanced. It is solid ISS to earth, but the other way is probably 10% if that much. Thus, for each packet delivered, there are 10 RETRIES or more than 20 packets on channel to deliver EACH LINE. But it is even worse than that. The ISS uses AX25V2L2 which means it does not even send a RETRY without first sending a what was your last heard line number packet. SO it will not even retry a single line until TWO more packets have been exchanged. Now multiply that by the 10% channel performance and it might take 20, 30 or 40 packets to deliver just ONE LINE. That is why if someone logs onto the BBS, that the pass is more or less wasted. The logee never gets a successful download due to all the bazillions of inefficient overhead, and no one else gets to make any digipeated contacts either. Just listen to a BBS pass, and its wall to wall packets, but only a line or two are actually delivered in most cases. The only true use of the BBS is possible if the ground station is using a few kilowatts of ERP to make sure that there are no missing ACKS! Something like that, Bob, WB4APR ___ 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: ISS Message Board
On Mon, Jul 25, 2011 at 03:43:03PM -0700, Ted wrote: Curious.. If Gordon (always ready with a cheerful comment) is accurate, then what is the purpose of the BBS? Also, Kevin is far from 'selfish'...he is just using The BBS is a side effect of the commercial equipment (Kenwood) they took up there. Many of us do think it should be disabled. the available resources. Helpful education is far more useful than lame name It's the way Gordon is, he's a nice chap online (on IRC). Don't take it the wrong way. The pair of you should go have a beer together or something. He's just a typical dour direct Scot, but he will drink you under the table. ;-) - 73 Diane VA3DB -- - d...@freebsd.org d...@db.net http://www.db.net/~db Why leave money to our children if we don't leave them the Earth? ___ 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: ISS Message Board
On Sun, 24 Jul 2011 05:07:16 -0700 Kevin Deane summit...@live.com wrote: Good morning Jeremy, saw your message but she fell out of veiw...Thanks KG6NUG for the cool flag that came up on my end anyway!! Glad to see active people and not BEACONS using the ISS Digi. Dont get me wrong, they serve their purpose... The problem is that when you use the packet BBS on the ISS, it stops digipeating packets for anyone else. So, for that entire pass, you're the only person who can work the ISS. Don't be selfish. -- Gordon JC Pearce MM0YEQ gordon...@gjcp.net ___ 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
