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

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"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

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"Jeff Findley" wrote in message
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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
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