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CX2SA > SATDIG 14.07.10 21:20l 198 Lines 8513 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Recording from HO-68 on June 20? (Michael Elliott)
2. Since there's been a lot of ISS chatter recently, I thought
this might be a good time to post (Robert Christ)
3. Re: Recording from HO-68 on June 20? (Dave Webb KB1PVH)
----------------------------------------------------------------------
Message: 1
Date: Wed, 14 Jul 2010 11:00:07 -0400
From: Michael Elliott <k4moa@xxxxxxx.xxx>
Subject: [amsat-bb] Recording from HO-68 on June 20?
To: amsat-bb@xxxxx.xxx
Message-ID:
<AANLkTinZXZz5G3nbMrvtiBe7ov2YQEl_XjRJ1ZTdO2MW@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Would anyone happen to have any recordings from HO-68 over Fathers Day
Weekend from June?
I have had an unfortunate incident with my mp3 recorder which had a couple
of passes of satellites from June 19 & 20 stored on it. I typically copy
my recordings to a computer late in the evenings or early morning, but we
were going to a family fathers day dinner and didn't get a chance to copy
them over. To make my story short, I had a CreativeLabs recorder which I
discovered did not like bouncing off of a brick patio. I thought it was
just the switch on the unit which failed so I grabbed another unit from
ebay. After putting the drive from into the new-to-me unit I was not able
to recover the data. I then tried another drive with different firmware
with again no success. Also the way Creative handles the formatting my PC
(Windows and Linux) could not view data off of the drive. I have since
grabbed a different recorder that has a good clip on it.
So now I've hit the web searching for possible help. I am fairly sure the
pass was Sunday the 20th, I know it was HO-68 and I worked a CM station
which was maritime mobile. I have listened to the recording from K8YSE (who
has a excellent site by the way) but my qso was not captured. I wish I
could verify the time but in my desire to try to fix the recorder I failed
to document the passes. I want to say it was around 14:00-18:00 UTC on
Sunday.
If anyone has a recording I would greatly appreciate if you would let me
know...
Thanks,
Mike, K4MOA
------------------------------
Message: 2
Date: Wed, 14 Jul 2010 12:40:53 -0400
From: Robert Christ <rjc53@xxxxxxx.xxx>
Subject: [amsat-bb] Since there's been a lot of ISS chatter recently,
I thought this might be a good time to post
To: amsat-bb@xxxxx.xxx
Cc: ao40cmd@xxxxx.xxxx ao7-cmd@xxxxx.xxx
Message-ID:
<AANLkTinByi4Mv280Bz0ZxiuwP0dMKuKiDDpTuc0c1XzO@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Hey everyone. I'm a researcher at Cornell, and this fall,?our
experimental, 1 inch diameter, ?chip satellites? are scheduled to be
launched on the final space shuttle flight, STS-134.? They're going to
be mounted on the exterior of the?ISS?structure, and will be set to
transmit a 902 MHz signal.? Unfortunately, we do not yet have an
antenna for receiving this transmission. ?After talking with Bob -
Wb4APR for a while, it was suggested that the fine members of the
AMSAT ? BB might be able to help us.
What we?re looking for is a digital capture of this 902MHz frequency
(with a bandwidth of about 200KHz), during at least one ISS pass (only
a few gigs of data, we believe). ?No decommutation or other analysis
of the signal will be required, but actually capturing the signal will
require at least a 20 dbB gain receive antenna (more details in a
minute).
If any of you can help us in this experiment, or are able to
successfully capture the signal, not only would we be incredibly
grateful, but we would also be prepared to add your names and
contributions to all of the published papers that will result from
this mission. ?It goes without saying, though, that we?d also be
entirely open to suggestions if the community, or a member, were aware
of some manner by which Cornell might be able to better avail itself
to the both those who help us on this project and the community as a
whole.
So here are the technical details.? There are 3 transmitting antennas,
all tiny, center-fed dipoles: two of them use wires separated by 180
degrees, and one has wires separated by 90 degrees. ?Each of these
dipoles is mounted a few mm from large metal panels on the ISS. ?The
ChipSats will transmit for approximately 10ms every 1-2 seconds, but
the signal is going to be beneath the noise floor.? Detecting the
signal requires a pseudorandom noise (PRN) code, which Cornell will
handle once the dataset is in hand. ?Since we can/will take care of
the post processing, and capture isn?t guaranteed on every ISS pass
(attitude alignment problems still TBD) so anyone who can take a
recording of this frequency at this bandwidth for us, of any ISS pass,
would be incredibly helpful.
The good news is that the chips will be live and transmitting almost
immediately after they are installed from STS-134, and they will
transmit continuously whenever the ISS is in sunlight. ?Additionally,
should they survive in their environment, they are set to transmit for
up to?two years, which should give us many chances to receive the data
and confirm that the ChipSats are functioning.
Thanks for your time, everyone,
Robert Christ
http://www.spacecraftresearch.com/
P.S. a little extra information: Our website is
http://www.spacecraftresearch.com/projects.html if you're interested.
This mission isn't explicitly mentioned there yet, but is rather a
proof of feasibility study for most of the projects listed on that
site. Ah and lastly, the ERP of the transmitter is expected to be ~10
dBm, though it will almost certainly be facing in a poor orientation,
giving us only a fraction of that power. We won't know the exact
amount for a few more days. Thanks all!
------------------------------
Message: 3
Date: Wed, 14 Jul 2010 13:38:44 -0400
From: Dave Webb KB1PVH <kb1pvh@xxxxx.xxx>
Subject: [amsat-bb] Re: Recording from HO-68 on June 20?
To: Michael Elliott <k4moa@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<AANLkTimzd0DnmE2t5NPJ9GBdqvpwXRXUozSwodXHWbBi@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Mike,
Check out this page- http://www.papays.com/sat/general.html , it belongs to
John K8YSE, he records all the FM passes.
Dave - KB1PVH
Sent from my Verizon Wireless DROID
On Jul 14, 2010 12:38 PM, "Michael Elliott" <k4moa@xxxxxxx.xxx> wrote:
Would anyone happen to have any recordings from HO-68 over Fathers Day
Weekend from June?
I have had an unfortunate incident with my mp3 recorder which had a couple
of passes of satellites from June 19 & 20 stored on it. I typically copy
my recordings to a computer late in the evenings or early morning, but we
were going to a family fathers day dinner and didn't get a chance to copy
them over. To make my story short, I had a CreativeLabs recorder which I
discovered did not like bouncing off of a brick patio. I thought it was
just the switch on the unit which failed so I grabbed another unit from
ebay. After putting the drive from into the new-to-me unit I was not able
to recover the data. I then tried another drive with different firmware
with again no success. Also the way Creative handles the formatting my PC
(Windows and Linux) could not view data off of the drive. I have since
grabbed a different recorder that has a good clip on it.
So now I've hit the web searching for possible help. I am fairly sure the
pass was Sunday the 20th, I know it was HO-68 and I worked a CM station
which was maritime mobile. I have listened to the recording from K8YSE (who
has a excellent site by the way) but my qso was not captured. I wish I
could verify the time but in my desire to try to fix the recorder I failed
to document the passes. I want to say it was around 14:00-18:00 UTC on
Sunday.
If anyone has a recording I would greatly appreciate if you would let me
know...
Thanks,
Mike, K4MOA
_______________________________________________
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------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 5, Issue 304
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