#1
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Is there a...
low bit rate (sounds a bit like RTTY) transmitter on the ISS on around
149.9xx Mhz? I ask as there is definitely such a transmission and though I've not checked the times exactly it seems to be around the times one would expect to be in range of the station from the UK. The doppler shift variation is very large and very hard to keep in tune manually. Its obviously in quite a low Earth orbit as this kind of doppler effect does not happen on spacecraft up where the weather sats are on 137Mhz. Its also an unusual freqency to use, often these tend to be russian in origin from memory. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! |
#2
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Is there a...
Remember when Brian Gaff bragged outrageously? That was Tuesday:
low bit rate (sounds a bit like RTTY) transmitter on the ISS on around 149.9xx Mhz? I ask as there is definitely such a transmission and though I've not checked the times exactly it seems to be around the times one would expect to be in range of the station from the UK. The doppler shift variation is very large and very hard to keep in tune manually. Its obviously in quite a low Earth orbit as this kind of doppler effect does not happen on spacecraft up where the weather sats are on 137Mhz. Its also an unusual freqency to use, often these tend to be russian in origin from memory. Brian That's a bit high for the amateur band transmitters; IIRC, those are on low band (143/144 MHz). On ISS (and on the Shuttle) those are usually used for voice contacts, often coordinated with volunteers visiting a school. /dps -- "This is all very fine, but let us not be carried away be excitement, but ask calmly, how does this person feel about in in his cooler moments next day, with six or seven thousand feet of snow and stuff on top of him?" _Roughing It_, Mark Twain. |
#4
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Is there a...
Actually, its not ham related as its there all the time, so to speak. I
wondered if any experiments up there might use such an unusual frequency. I know that some times in the past the Russians did use some frequencies up around 147Mhz for voice comms when over the country, but unless someone can decode this strange signal and positively identify it al one can say for sure is that it is space based and in a low earth orbit. If it were too low it would have re entered by now though. Definitely multiple FSK signals either side of a blank carrier is what it sounds like on my receiver but as I say the speed as viewed from here is varying widely and then stabilises then varies again. Without knowing the centre frequency it is actually on it would be hard to say when its coming toward you or moving away. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "Jeff Findley" wrote in message ... In article , says... low bit rate (sounds a bit like RTTY) transmitter on the ISS on around 149.9xx Mhz? I ask as there is definitely such a transmission and though I've not checked the times exactly it seems to be around the times one would expect to be in range of the station from the UK. The doppler shift variation is very large and very hard to keep in tune manually. Its obviously in quite a low Earth orbit as this kind of doppler effect does not happen on spacecraft up where the weather sats are on 137Mhz. Its also an unusual freqency to use, often these tend to be russian in origin from memory. Unsure of the details, but this is a high level overview for those who have never heard of this before. International Space Station Reference Ham Radio http://spaceflight.nasa.gov/station/reference/radio/ Jeff -- All opinions posted by me on Usenet News are mine, and mine alone. These posts do not reflect the opinions of my family, friends, employer, or any organization that I am a member of. |
#5
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Is there a...
When I say all the time what iI mean is that there are the same signals
audible whenever the orbit brings it into range of course. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "Brian Gaff" wrote in message ... Actually, its not ham related as its there all the time, so to speak. I wondered if any experiments up there might use such an unusual frequency. I know that some times in the past the Russians did use some frequencies up around 147Mhz for voice comms when over the country, but unless someone can decode this strange signal and positively identify it al one can say for sure is that it is space based and in a low earth orbit. If it were too low it would have re entered by now though. Definitely multiple FSK signals either side of a blank carrier is what it sounds like on my receiver but as I say the speed as viewed from here is varying widely and then stabilises then varies again. Without knowing the centre frequency it is actually on it would be hard to say when its coming toward you or moving away. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "Jeff Findley" wrote in message ... In article , says... low bit rate (sounds a bit like RTTY) transmitter on the ISS on around 149.9xx Mhz? I ask as there is definitely such a transmission and though I've not checked the times exactly it seems to be around the times one would expect to be in range of the station from the UK. The doppler shift variation is very large and very hard to keep in tune manually. Its obviously in quite a low Earth orbit as this kind of doppler effect does not happen on spacecraft up where the weather sats are on 137Mhz. Its also an unusual freqency to use, often these tend to be russian in origin from memory. Unsure of the details, but this is a high level overview for those who have never heard of this before. International Space Station Reference Ham Radio http://spaceflight.nasa.gov/station/reference/radio/ Jeff -- All opinions posted by me on Usenet News are mine, and mine alone. These posts do not reflect the opinions of my family, friends, employer, or any organization that I am a member of. |
#6
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Is there a...
So nobody has any facts about this then. I certainly don't but its still
there. brain -- From the Sofa of Brian Gaff Reply address is active Remember, if you don't like where I post or what I say, you don't have to read my posts! :-) "Brian Gaff" wrote in message ... When I say all the time what iI mean is that there are the same signals audible whenever the orbit brings it into range of course. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "Brian Gaff" wrote in message ... Actually, its not ham related as its there all the time, so to speak. I wondered if any experiments up there might use such an unusual frequency. I know that some times in the past the Russians did use some frequencies up around 147Mhz for voice comms when over the country, but unless someone can decode this strange signal and positively identify it al one can say for sure is that it is space based and in a low earth orbit. If it were too low it would have re entered by now though. Definitely multiple FSK signals either side of a blank carrier is what it sounds like on my receiver but as I say the speed as viewed from here is varying widely and then stabilises then varies again. Without knowing the centre frequency it is actually on it would be hard to say when its coming toward you or moving away. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "Jeff Findley" wrote in message ... In article , says... low bit rate (sounds a bit like RTTY) transmitter on the ISS on around 149.9xx Mhz? I ask as there is definitely such a transmission and though I've not checked the times exactly it seems to be around the times one would expect to be in range of the station from the UK. The doppler shift variation is very large and very hard to keep in tune manually. Its obviously in quite a low Earth orbit as this kind of doppler effect does not happen on spacecraft up where the weather sats are on 137Mhz. Its also an unusual freqency to use, often these tend to be russian in origin from memory. Unsure of the details, but this is a high level overview for those who have never heard of this before. International Space Station Reference Ham Radio http://spaceflight.nasa.gov/station/reference/radio/ Jeff -- All opinions posted by me on Usenet News are mine, and mine alone. These posts do not reflect the opinions of my family, friends, employer, or any organization that I am a member of. |
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