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#1
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How to receive ISS images ?
Hi,
I live in Europe. I 'd like to know if it could be possible to receive video signal from ISS (the one usually sent to Houston) when it crosses the sky over europe and display the pictures on a normal TV (not via NASA TV). Could it be possible to pick up the signal with a normal satellite dish (and of what diameter) and on which frequencies ? In addition, could the signal be encrypted to prevent any reading ? I haven't found any information about that on the net but I could imagine that we you are able to pick up radio communication from ISS and NASA can receive their video, it could be also possible to receive the video aswell (in the same way at weather imags). Thanks for your lights Thierry |
#2
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How to receive ISS images ?
ISS video is not beamed to the ground, but to TDRSS satellites in geosync
orbit which then relay it to several ground terminals (one is in New Mexico). That video is digitally encoded and interleaved with non-video data so even if you pointed your dish at the TDRSS satellite you would still have to decode it. I don't know if the TDRSS downlink is encrypted. The re-uplinked video from the ground terminals is LEITCH encrypted. Thierry wrote in message ... Hi, I live in Europe. I 'd like to know if it could be possible to receive video signal from ISS (the one usually sent to Houston) when it crosses the sky over europe and display the pictures on a normal TV (not via NASA TV). Could it be possible to pick up the signal with a normal satellite dish (and of what diameter) and on which frequencies ? In addition, could the signal be encrypted to prevent any reading ? I haven't found any information about that on the net but I could imagine that we you are able to pick up radio communication from ISS and NASA can receive their video, it could be also possible to receive the video aswell (in the same way at weather imags). Thanks for your lights Thierry |
#3
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How to receive ISS images ?
On 2006-09-17 06:53:35 -0400, Thierry said:
Hi, I live in Europe. I 'd like to know if it could be possible to receive video signal from ISS (the one usually sent to Houston) when it crosses the sky over europe and display the pictures on a normal TV (not via NASA TV). Thierry You can't. They go to a TDRS and I believe get encrypted. |
#4
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How to receive ISS images ?
hi thierry,
I know you wanted to d/l direct from the ISS, but here is link for video, audio and still photos from the nasa archive, searchable by mission, etc. http://spaceflight.nasa.gov/gallery/ 73 joe |
#5
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How to receive ISS images ?
"Johnny Borborigmi" wrote in message news:2006091713402675249%growl@tummycom... On 2006-09-17 06:53:35 -0400, Thierry said: Hi, I live in Europe. I 'd like to know if it could be possible to receive video signal from ISS (the one usually sent to Houston) when it crosses the sky over europe and display the pictures on a normal TV (not via NASA TV). Thierry You can't. They go to a TDRS and I believe get encrypted. OK. Undertood. In theory, as ISS is quite low on orbit, and if the TDRS linked satellite is over my country (data easy to get using a software lik Thesky or any other tracking software à la Prbitron), using a large parabolic antenna or even a dipole, it shouldn't be possible to get the signal ? Or I could as any other signal (at the condition to knwo its frequency) but I could simply not read it due to a possible encryption. In fact i don't udnerstand why I could at least receive it as I can receive military and other "private" messages using a scanner or another V/UFH rig for example. Thanks in advance Thierry |
#6
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How to receive ISS images ?
nmp wrote:
Op Mon, 18 Sep 2006 13:50:51 +0200, schreef Thierry: "Johnny Borborigmi" wrote in message news:2006091713402675249%growl@tummycom... On 2006-09-17 06:53:35 -0400, Thierry said: Hi, I live in Europe. I 'd like to know if it could be possible to receive video signal from ISS (the one usually sent to Houston) when it crosses the sky over europe and display the pictures on a normal TV (not via NASA TV). You can't. They go to a TDRS and I believe get encrypted. OK. Undertood. In theory, as ISS is quite low on orbit, and if the TDRS linked satellite is over my country (data easy to get using a software lik Thesky or any other tracking software à la Prbitron), using a large parabolic antenna or even a dipole, it shouldn't be possible to get the signal ? From the replies in this thread I understand that you may be able to receive the signal, but you would not be able to decode it to get somehting useful out of it. These sites may not answer the specific question, but will give a sense of what's involved: http://www.hearsat.org/ http://www.uhf-satcom.com/ http://www.hobbyspace.com/Radio/index.html -- Frank You know what to remove to reply... Check out my web page: http://www.geocities.com/stardolphin1/link2.htm "To confine our attention to terrestrial matters would be to limit the human spirit." - Stephen Hawking |
#7
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How to receive ISS images ?
In article , Thierry wrote:
You can't. They go to a TDRS and I believe get encrypted. In theory, as ISS is quite low on orbit, and if the TDRS linked satellite is over my country (data easy to get using a software lik Thesky or any other tracking software à la Prbitron), using a large parabolic antenna or even a dipole, it shouldn't be possible to get the signal ? Remember, these signals are not being broadcast -- they are beamed upward to TDRS (in geostationary orbit), at microwave frequencies where even modest-sized antennas are quite directional. Similarly, TDRS is not broadcasting them -- it beams them downward to the TDRS ground station at White Sands. Even when ISS is nearby, you're nowhere near either beam, so any signal leakage would be very weak. With a large dish antenna you could probably detect the carrier, but demodulating it would be quite a challenge with such a weak signal. And once you do demodulate it, what you've got is not a video signal, but a fast digital bit stream. Some of the bits are compressed video; some aren't. The format is certainly complex, almost certainly a custom design rather than anything standard (remember that it is 15-20 years old -- ISS development started a long time ago), and probably poorly documented. Finally, as others have mentioned, it's quite likely to be encrypted. -- spsystems.net is temporarily off the air; | Henry Spencer mail to henry at zoo.utoronto.ca instead. | |
#8
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How to receive ISS images ?
Check out section 4.9 in the ISS familiarization manual (PDF page 110): http://www1.jsc.nasa.gov/er/seh/td9702.pdf "Henry Spencer" wrote in message ... In article , Thierry wrote: You can't. They go to a TDRS and I believe get encrypted. In theory, as ISS is quite low on orbit, and if the TDRS linked satellite is over my country (data easy to get using a software lik Thesky or any other tracking software à la Prbitron), using a large parabolic antenna or even a dipole, it shouldn't be possible to get the signal ? Remember, these signals are not being broadcast -- they are beamed upward to TDRS (in geostationary orbit), at microwave frequencies where even modest-sized antennas are quite directional. Similarly, TDRS is not broadcasting them -- it beams them downward to the TDRS ground station at White Sands. Even when ISS is nearby, you're nowhere near either beam, so any signal leakage would be very weak. With a large dish antenna you could probably detect the carrier, but demodulating it would be quite a challenge with such a weak signal. And once you do demodulate it, what you've got is not a video signal, but a fast digital bit stream. Some of the bits are compressed video; some aren't. The format is certainly complex, almost certainly a custom design rather than anything standard (remember that it is 15-20 years old -- ISS development started a long time ago), and probably poorly documented. Finally, as others have mentioned, it's quite likely to be encrypted. -- spsystems.net is temporarily off the air; | Henry Spencer mail to henry at zoo.utoronto.ca instead. | |
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