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
LES1 (I think) has a bent-pipe transponder for military UHF (250 MHz
area). I wonder if the billion to one chance that the transponder came on
too?
Bob, WB4aPR
-----Original Message-----
From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] On
Behalf Of Alan
Sent: Wednesday, February 27, 2013 7:48 AM
Subject: [amsat-bb] Radio-Archeology
Another satellite comes back to life:
http://www.southgatearc.org/news/february2013/radio_archeology.htm
Another satellite comes back to life:
http://www.southgatearc.org/news/february2013/radio_archeology.htm
AO-7 isn't as old, but so far as we know, came back first. There is always
the question of how long this latest satellite has been transmitting before
somebody noticed.
73s,
Alan
WA4SCA
-----------------------------------
Asteroids are Nature's way of asking:
"How's that space program coming along?"
Aaron Williams
Okay, I looked---it's just text and I've copied it :)
73,
Mark N8MH
At 09:51 AM 2/27/2013 +0000, you wrote:
>Tweet from Surrey regarding #STRaND-1
>--
>We have a new beacon type out at the moment - and it has a message in it! See if you can receive it :D
>--
>
>STRaND-1 telemetry information
>http://amsat-uk.org/satellites/strand-1/strand-1-telemetry/
>
>General STRaND-1 information
>http://amsat-uk.org/satellites/strand-1/
>
>73 Trevor M5AKA
>
>
>_______________________________________________
>Sent via AMSAT-BB(a)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
Lame telemetry nuts like me that don't write code need a Windows decoder :)
73,
Mark N8MH
At 09:51 AM 2/27/2013 +0000, Trevor . wrote:
>Tweet from Surrey regarding #STRaND-1
>--
>We have a new beacon type out at the moment - and it has a message in it! See if you can receive it :D
>--
>
>STRaND-1 telemetry information
>http://amsat-uk.org/satellites/strand-1/strand-1-telemetry/
>
>General STRaND-1 information
>http://amsat-uk.org/satellites/strand-1/
>
>73 Trevor M5AKA
>
>
>_______________________________________________
>Sent via AMSAT-BB(a)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
Was monitoring STRaND-1 this evening during the 0433Z pass far over the
Pacific where I have an unobstructed view. STRaND-1 happened to be
transmitting at it's LOS which matches object 39092's predicted LOS and was
approximately a minute after object 39091 predicted LOS.
So, my vote is:
39092 = STRaND-1
39091 = AAUSAT-3
Ken,
W7KKE, CN75xa
Aloha late nite Satellite Trackers
I plan on being on FO29 in a couple hours from now. The footprint
will include primarily the western U.S. extreme (CA, NV, WA, OR)
and the likes. So for u late nighters....
73 de robert, NH7WN
Honolulu
Hello list,
I am looking for an IC-970 (preferably H), admittedly not an easy find
these days.
I will be glad to pay a little extra to cover for the hassle of
international shipping (in fact, the only hassle is having to compile a
customs declaration, but still...), plus, obviously, the full shipping
expenses.
Thanks andd 73.
--
_____________________________
Pete Parisetti MM0TWX
(currently HB9DSU in Geneva)
