| |
CX2SA > SATDIG 15.07.10 18:10l 1196 Lines 38966 Bytes #999 (0) @ WW
BID : AMSATBB5305
Read: GUEST
Subj: AMSAT-BB-digest V5 305
Path: IZ3LSV<IK2XDE<IR2UBX<IW8PGT<CX2SA
Sent: 100715/1603Z @:CX2SA.LAV.URY.SA #:6976 [Minas] FBB7.00e $:AMSATBB5305
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Chipsat (Howie DeFelice)
2. Re: Chipsat (Robert Christ)
3. Re: Since there's been a lot of ISS chatter recently, I
thought this might be a good time to post (Edward R Cole)
4. Re: Since there's been a lot of ISS chatter recently, I
thought this might be a good time to post (Robert Christ)
5. Re: Since there's been a lot of ISS chatter recently, I
thought this might be a good time to post (Edward R Cole)
6. Live Webstream of AMSAT-UK Space Colloquium (Trevor .)
7. Re: ISS (Bill Acito)
8. Re: AO-51 obseved solar eclipse? (Alexandru Csete)
9. Re: AO-51 obseved solar eclipse? (Mark L. Hammond)
10. Thanks for the TI Support (Mark Spencer)
11. ISS Picture SSTV Martin 1 14:02UTC (CE3SOC Raul Romero)
12. HO-68 Schedule -18-25 July 2010 (Alan Kung)
----------------------------------------------------------------------
Message: 1
Date: Wed, 14 Jul 2010 15:39:49 -0400
From: Howie DeFelice <howied231@xxxxxxx.xxx>
Subject: [amsat-bb] Chipsat
To: <amsat-bb@xxxxx.xxx>
Message-ID: <BAY142-W285607D00E00432FF74383E7BA0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
I may be missing something, but if I understand the following statement
correctly:
"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."
This would require the receiving station to digitize the entire pass band,
plus and minus doppler, so that Cornell could apply the PRN to pull the signal
out of the noise floor for demodulation. This is beyond the capability of
the "typical"
ham station but may be practical with some SDR based radios. Not making use
of the PRN
code for the capture will mean that it will be totally blind. i.e. there
will be no way
to know if you are really receiving anything and if the 20 dB antenna was
pointed correctly.
This is certainly a challenging task.
Howie
AB2S
_________________________________________________________________
The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with
Hotmail.
http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID2832
6::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5
------------------------------
Message: 2
Date: Wed, 14 Jul 2010 16:20:38 -0400
From: Robert Christ <rjc53@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Chipsat
To: Howie DeFelice <howied231@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<AANLkTinIgc1KzV3xLpxX5uPkIV1UjWbk3PC_mDB794u0@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
We would of course be willing to work with anyone, and offer any help
possible to individuals attempting this task, but this task is
certainly not without its challenges. ?The positive side is that while
individual passes may be blind, there are multiple passes, and anyone
interested could try as many times as desired. ?As for digitizing the
entire pass band, yes, this is what we are hoping for (though at
200KHz, this shouldn't be more than a few gigs of data). ?Of course,
we would be willing to do any additional work in post-processing
necessary, should a ground station be incapable, or partially
successful, with their personal limitations. ?If it would help to
modify the data for doppler effects, post-capture, we could
investigate this as well. ?There is still planning time before the
launch.
"This is certainly a challenging task"
Up to the challenge?
Robert Christ
On Wed, Jul 14, 2010 at 3:39 PM, Howie DeFelice <howied231@xxxxxxx.xxx> wrote:
>
> I may be missing something, but if I understand the following statement
correctly:
>
> "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."
> This would require the receiving station to digitize the entire pass band,
> plus and minus doppler, so that Cornell could apply the PRN to pull the
signal
> out of the noise floor for demodulation. This is beyond the capability of
the "typical"
> ham station but may be practical with some SDR based radios. Not making
use of the PRN
> code for the capture will mean that it will be totally blind. i.e. there
will be no way
> to know if you are really receiving anything and if the 20 dB antenna was
pointed correctly.
> This is certainly a challenging task.
>
> Howie
> AB2S
>
> _________________________________________________________________
> The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with
Hotmail.
>
http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID2832
6::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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
>
------------------------------
Message: 3
Date: Wed, 14 Jul 2010 12:32:45 -0800
From: Edward R Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Since there's been a lot of ISS chatter
recently, I thought this might be a good time to post
To: Robert Christ <rjc53@xxxxxxx.xxx>, amsat-bb@xxxxx.xxx
Cc: ao40cmd@xxxxx.xxxx ao7-cmd@xxxxx.xxx
Message-ID: <201007142032.o6EKWjP4095856@xxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"; format=flowed
Here is what I calculate:
10 dBm Tx power
0 dBic zero gain Tx antenna
20 dBic Rx antenna gain
0 dB Cross polarity loss
902 MHz
0.001 millions of km (1000km)
20 K sky temp
40 K Rx antenna temp
36 K receiver noise temp
200000 Hz bandwidth
151.5 dB space loss at 1000km
-121.5 dBm received signal level
96 K total receive system noise temp
-125.8 dBm EIRP
4.3 dB S/N
this was calculated using the spreadsheet I made
for determining the signal from MRO:
http://www.kl7uw.com/raseti.htm
click on the word "calculate" to download the spreadsheet.
this works for determining any spacecraft signal reception.
A 20-db antenna will have around a 10 degree
beamwidth so much easier to point than what hams used for AO-40 on 2.4 GHz
probably a 4 to 6 foot dish will suffice.
At 08:40 AM 7/14/2010, Robert Christ wrote:
>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 helpp
>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!
>_______________________________________________
>Sent via AMSAT-BB@xxxxx.xxx. 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
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 144-QRT*, 432-100w, 1296-QRT*, 3400-fall 2010
DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
======================================
*temp
------------------------------
Message: 4
Date: Wed, 14 Jul 2010 16:44:10 -0400
From: Robert Christ <rjc53@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Since there's been a lot of ISS chatter
recently, I thought this might be a good time to post
To: Edward R Cole <kl7uw@xxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx ao40cmd@xxxxx.xxxx ao7-cmd@xxxxx.xxx
Message-ID:
<AANLkTinB5f8HFC8hBaV2FmsFwoxI9daavdhoWU8K7jdD@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
My original back of the napkin calculations showed a 6-8' dish, so
yes, this seems
approximately correct. Point to keep in mind: the 10 dBm will not be
the Tx power. 10 dBm will be the maximum Tx power. Due to bad
orientation, we expect to only receive a fraction of that, unless
someone gets particularly lucky with ISS orientation. I'll be
simulating exactly how much
of a fraction over the next few days, and of course could do so for anyone's
particular location.
Robert
On Wed, Jul 14, 2010 at 4:32 PM, Edward R Cole <kl7uw@xxxxxxxxx.xxx> wrote:
> Here is what I calculate:
> 10 dBm ?Tx power
> 0 dBic ? ?zero gain Tx antenna
> 20 dBic ? Rx antenna gain
> 0 dB ? ? ? Cross polarity loss
> 902 MHz
> 0.001 millions of km (1000km)
> 20 K ? ? ? sky temp
> 40 K ? ? ? Rx antenna temp
> 36 K ? ? ? receiver noise temp
> 200000 Hz ? bandwidth
>
> 151.5 dB ? ? space loss at 1000km
> -121.5 dBm ?received signal level
> 96 K ? ? ? ? ? total receive system noise temp
> -125.8 dBm ? EIRP
> 4.3 dB ? ? ? ? S/N
>
> this was calculated using the spreadsheet I made for determining the signal
> from MRO:
> http://www.kl7uw.com/raseti.htm
> click on the word "calculate" to download the spreadsheet.
> this works for determining any spacecraft signal reception.
>
> A 20-db antenna will have around a 10 degree beamwidth so much easier to
> point than what hams used for AO-40 on 2.4 GHz
>
> probably a 4 to 6 foot dish will suffice.
>
>
>
> At 08:40 AM 7/14/2010, Robert Christ wrote:
>>
>> 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
>> helpp 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! _______________________________________________ Sent via
>> AMSAT-BB@xxxxx.xxx. 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
>
>
> 73, Ed - KL7UW, WD2XSH/45
> ======================================
> BP40IQ ? 500 KHz - 10-GHz ? www.kl7uw.com
> EME: 144-QRT*, 432-100w, 1296-QRT*, 3400-fall 2010
> DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
> ======================================
> *temp
>
------------------------------
Message: 5
Date: Wed, 14 Jul 2010 12:50:40 -0800
From: Edward R Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: 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
Message-ID: <201007142050.o6EKofPM001583@xxxxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"; format=flowed
Sorry a labled two lines backward:
-121.5 dBm is Ps signal level received from the s/c
-125.8 dBm is Pn sensitivity of receive system
S/N = Ps-Pn in dB
I also ignored any squint angle for the
transmitter on the ISS so that could add a lot more dB of loss.
But the link is not as bad as one would think reading the specs.
At 12:32 PM 7/14/2010, you wrote:
>Here is what I calculate:
>10 dBm Tx power
>0 dBic zero gain Tx antenna
>20 dBic Rx antenna gain
>0 dB Cross polarity loss
>902 MHz
>0.001 millions of km (1000km)
>20 K sky temp
>40 K Rx antenna temp
>36 K receiver noise temp
>200000 Hz bandwidth
>
>151.5 dB space loss at 1000km
>-121.5 dBm received signal level
>96 K total receive system noise temp
>-125.8 dBm EIRP
>4.3 dB S/N
>
>this was calculated using the spreadsheet I made
>for determining the signal from MRO:
>http://www.kl7uw.com/raseti.htm
>click on the word "calculate" to download the spreadsheet.
>this works for determining any spacecraft signal reception.
>
>A 20-db antenna will have around a 10 degree
>beamwidth so much easier to point than what hams used for AO-40 on 2.4 GHz
>
>probably a 4 to 6 foot dish will suffice.
>
>
>
>At 08:40 AM 7/14/2010, Robert Christ wrote:
> >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 helpp
> >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!
> >_______________________________________________
> >Sent via AMSAT-BB@xxxxx.xxx. 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
>
>
>73, Ed - KL7UW, WD2XSH/45
>======================================
>BP40IQ 500 KHz - 10-GHz www.kl7uw.com
>EME: 144-QRT*, 432-100w, 1296-QRT*, 3400-fall 2010
>DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
>======================================
>*temp
>
>
>_______________________________________________
>Sent via AMSAT-BB@xxxxx.xxx. 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
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 144-QRT*, 432-100w, 1296-QRT*, 3400-fall 2010
DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
======================================
*temp
------------------------------
Message: 6
Date: Wed, 14 Jul 2010 22:19:14 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Live Webstream of AMSAT-UK Space Colloquium
To: amsat-bb@xxxxx.xxx
Message-ID: <71889.91096.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
The 2010? Space Colloquium - the 25th held by AMSAT-UK, is taking place on
July 31 and August 1 at the Holiday Inn in Guildford, England.
As usual there will be many interesting presentations and demonstrations
from the developers and users of the ever increasing number of amateur radio
satellites. In addition there will be talks on nano propulsion systems,
solar sails, cubesat sized linear transponders, the GENSO ground station
network, GNU radios and numerous other topics.
It is still possible to attend the meeting itself, although the "early
booking" rates may now no longer be available? - for booking details see
http://www.uk.amsat.org/colloquium
If, however, you are unable to attend in person, we can announce that the
batc.tv webstream service will again be provided over the weekend starting
from 1000BST (0900UTC) on the Saturday.
The current programme - which is always subject to late changes - can be
seen here
http://www.uk.amsat.org/content/view/713/284/
again please note that all timings are given BST which is UTC +1.
The BATC.TV webstream will be available here, click on Live Events
http://www.batc.tv/
AMSAT-UK
http://www.uk.amsat.org/
----
73 Trevor M5AKA
------------------------------
Message: 7
Date: Wed, 14 Jul 2010 19:15:37 -0400
From: Bill Acito <w1pa@xxxxxxx.xxx>
Subject: [amsat-bb] Re: ISS
To: <amsat-bb@xxxxx.xxx>
Message-ID: <BAY117-W41E4B9530E88DCFC3B65BF98BA0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Anyone have a recording of the pass over NA at 6PM EDT, today?
I worked Col. Wheelock from the mobile (5:50EDT) outside of Boston. He
acknowledged calls and the fact that I was mobile.
(thank you, Pete)
I usually have a digital audio recorder in the car, but neglected to bring
it today.
Contact me at [my call]@xxxxxxx
Bill W1PA
------------------------------
Message: 8
Date: Wed, 14 Jul 2010 20:37:04 +0200
From: Alexandru Csete <alexc@xxxx.xx.xx>
Subject: [amsat-bb] Re: AO-51 obseved solar eclipse?
To: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx ao51-modes@xxxxx.xxx
Message-ID: <20100714203704.15ba59b5@xxxxxxx>
Content-Type: text/plain; charset=UTF-8
Greetings,
I ran a simulation using the Celestia space simulator and could indeed
observe a partial solar eclipse as seen from AO-51 :)
I have recorded the simulation to a video and you can watch it on
Youtube:
http://www.youtube.com/watch?v=7ET8BhbqmVk
I couldn't find any 3d model of AO-51 so I used a model of AO-7 - sorry
for that. Also note that I used TLEs from today to generate orbital
data for Celestia so the time and may not be scientifically accurate.
If you want to run the simulation for yourself, watch from other
angles, etc., you can get Celestia for free from
http://shatters.net/celestia/
You'll need to add the data files for AO-51 in the "extras" folder;
you can use mine to begin with. There is a .zip file here:
http://files.oz9aec.net/video/SolarEclipse/
You'll also find the H.264 encoded video there that you are free to
download (~100MB).
73
Alex Oz9AEC
On Tue, 13 Jul 2010 13:10:41 -0400
"Mark L. Hammond" <marklhammond@xxxxx.xxx> wrote:
> Hello Masahiro,
>
> Thank you for your message! You have made a great observation, and I
> think you are exactly right about the cause of the observed "glitches"
> in the telemetry. Usually at this point in its orbit we would observe
> AO-51 charging its batteries at a steady rate from fully illuminated
> panels.
>
> >From what I've read from page 43 here:
> http://eclipse.gsfc.nasa.gov/SEpubs/2010/TP214171a.pdf the eclipse
> was from 18:15 to 20:52 UTC. Look also at the areas experiencing
> eclipse.
>
> Please be aware that the "clock" on AO-51 runs fast. It is now about
> 3 minutes fast, so look at telemetry timestamped from about 18:18
> until 20:55 UTC.
>
> Since the duration of the solar eclipse was 2 hrs 39 min (or 159 mins)
> and AO-51 orbits every 100 minutes or so, it could have been affected
> two times.
>
> I've plotted some of the telemetry collected from that period
> (telemetry from 1800-2130utc) and posted it here:
>
http://www.amsat.org/amsat/ftp/telemetry/ao51/2010WOD/July2010/Wd071100_1800to
2130utc_solar_eclipse.xls
>
> And here's a screenshot of AO-51 at the time:
>
http://www.amsat.org/amsat/ftp/telemetry/ao51/2010WOD/July2010/ao51_11July2010
_2045utc_solar_eclipse.jpg
>
> 73!
>
> Mark N8MH
>
>
>
> 2010/7/13 Masahiro Arai <m-arai@x.xxxxx.xx.xx>:
> >
> > Total solar eclipse was observed in southern Pacific Ocean at 11th
> > July. I checked AO-51 WOD file. Total Array I shows glitch at
> > 2043-2045z. AO-51 was located on east of Argentina at the time. Is
> > this glitch made with solar eclipse??
> >
> >
> > AO-51 Wd071100
> > 2010/7/11
> > UTC ? ?Total Array I [mA]
> > 20:35 ? -2.111
> > 20:36 ? -0.323
> > 20:37 ? -0.323
> > 20:38 ? ?1.465
> > 20:39 ? -0.323
> > 20:40 ?528.851
> > 20:41 ?321.472
> > 20:42 ?307.170
> > 20:43 ?183.815
> > 20:44 ?190.966
> > 20:45 ?176.664
> > 20:46 ?249.962
> > 20:47 ?300.019
> > 20:48 ?396.557
> > 20:49 ?498.459
> > 20:50 ?519.912
> > 20:51 ?729.079
> > 20:52 ?634.328
> > 20:53 ?936.458
> > 20:54 ?843.495
> > 20:55 ?948.972
> >
> >
> > WOD file
> > ftp://ftp.amsat.org/pub/amsat/telemetry/ao51/2010WOD/July2010/Wd071100
> >
> > AO-51 WOD decoder
> > http://tinyurl.com/DK3WNsoftware
> >
> >
> > 73
> >
> > Masa ?JN1GKZ ? ?Tokyo Japan
> >
> >
> >
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. 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
> >
>
>
>
------------------------------
Message: 9
Date: Wed, 14 Jul 2010 18:58:26 -0400
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 obseved solar eclipse?
To: Alexandru Csete <alexc@xxxx.xx.xx>
Cc: amsat-bb@xxxxx.xxxx ao51-modes@xxxxx.xxx
Message-ID: <hyyM1e00R56cfur05yySzc@xxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Very interesting, Alex! Thank you for sharing that video.
73,
Mark N8MH
At 08:37 PM 7/14/2010 +0200, Alexandru Csete wrote:
>Greetings,
>
>I ran a simulation using the Celestia space simulator and could indeed
>observe a partial solar eclipse as seen from AO-51 :)
>I have recorded the simulation to a video and you can watch it on
>Youtube:
>http://www.youtube.com/watch?v=7ET8BhbqmVk
>
>I couldn't find any 3d model of AO-51 so I used a model of AO-7 - sorry
>for that. Also note that I used TLEs from today to generate orbital
>data for Celestia so the time and may not be scientifically accurate.
>
>If you want to run the simulation for yourself, watch from other
>angles, etc., you can get Celestia for free from
>http://shatters.net/celestia/
>You'll need to add the data files for AO-51 in the "extras" folder;
>you can use mine to begin with. There is a .zip file here:
>http://files.oz9aec.net/video/SolarEclipse/
>
>You'll also find the H.264 encoded video there that you are free to
>download (~100MB).
>
>73
>Alex Oz9AEC
>
>
>On Tue, 13 Jul 2010 13:10:41 -0400
>"Mark L. Hammond" <marklhammond@xxxxx.xxx> wrote:
>
>> Hello Masahiro,
>>
>> Thank you for your message! You have made a great observation, and I
>> think you are exactly right about the cause of the observed "glitches"
>> in the telemetry. Usually at this point in its orbit we would observe
>> AO-51 charging its batteries at a steady rate from fully illuminated
>> panels.
>>
>> >From what I've read from page 43 here:
>> http://eclipse.gsfc.nasa.gov/SEpubs/2010/TP214171a.pdf the eclipse
>> was from 18:15 to 20:52 UTC. Look also at the areas experiencing
>> eclipse.
>>
>> Please be aware that the "clock" on AO-51 runs fast. It is now about
>> 3 minutes fast, so look at telemetry timestamped from about 18:18
>> until 20:55 UTC.
>>
>> Since the duration of the solar eclipse was 2 hrs 39 min (or 159 mins)
>> and AO-51 orbits every 100 minutes or so, it could have been affected
>> two times.
>>
>> I've plotted some of the telemetry collected from that period
>> (telemetry from 1800-2130utc) and posted it here:
>>
http://www.amsat.org/amsat/ftp/telemetry/ao51/2010WOD/July2010/Wd071100_1800to
2130utc_solar_eclipse.xls
>>
>> And here's a screenshot of AO-51 at the time:
>>
http://www.amsat.org/amsat/ftp/telemetry/ao51/2010WOD/July2010/ao51_11July2010
_2045utc_solar_eclipse.jpg
>>
>> 73!
>>
>> Mark N8MH
>>
>>
>>
>> 2010/7/13 Masahiro Arai <m-arai@x.xxxxx.xx.xx>:
>> >
>> > Total solar eclipse was observed in southern Pacific Ocean at 11th
>> > July. I checked AO-51 WOD file. Total Array I shows glitch at
>> > 2043-2045z. AO-51 was located on east of Argentina at the time. Is
>> > this glitch made with solar eclipse??
>> >
>> >
>> > AO-51 Wd071100
>> > 2010/7/11
>> > UTC ? ? Total Array I [mA]
>> > 20:35 ? -2.111
>> > 20:36 ? -0.323
>> > 20:37 ? -0.323
>> > 20:38 ? ? 1.465
>> > 20:39 ? -0.323
>> > 20:40 ? 528.851
>> > 20:41 ? 321.472
>> > 20:42 ? 307.170
>> > 20:43 ? 183.815
>> > 20:44 ? 190.966
>> > 20:45 ? 176.664
>> > 20:46 ? 249.962
>> > 20:47 ? 300.019
>> > 20:48 ? 396.557
>> > 20:49 ? 498.459
>> > 20:50 ? 519.912
>> > 20:51 ? 729.079
>> > 20:52 ? 634.328
>> > 20:53 ? 936.458
>> > 20:54 ? 843.495
>> > 20:55 ? 948.972
>> >
>> >
>> > WOD file
>> > ftp://ftp.amsat.org/pub/amsat/telemetry/ao51/2010WOD/July2010/Wd071100
>> >
>> > AO-51 WOD decoder
>> > http://tinyurl.com/DK3WNsoftware
>> >
>> >
>> > 73
>> >
>> > Masa ? JN1GKZ ? ? Tokyo Japan
>> >
>> >
>> >
>> > _______________________________________________
>> > Sent via AMSAT-BB@xxxxx.xxx. 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
>> >
>>
>>
>>
Mark L. Hammond [N8MH]
------------------------------
Message: 10
Date: Thu, 15 Jul 2010 10:27:34 -0400
From: "Mark Spencer" <mspencer@xxxxxx.xxx>
Subject: [amsat-bb] Thanks for the TI Support
To: <amsat-bb@xxxxx.xxx>, "'Debra Johnson'" <djohnson@xxxx.xxx>,
"'Nathan M.'" <k9cpo@xxxx.xxx>, <kd7rpp@xxxx.xxx>, "'Jennifer Knapp'"
<jknapp@xxxx.xxx>, "'Hobart, Mary K1MMH'" <mhobart@xxxx.xxx>
Message-ID: <20100715142737.4E8F8BDFF21@xxxxxxxxxxx.x.xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I want to offer my sincerest thanks to the satellite community, Drew, and
AMSAT for the support that you gave us during the TI-2 Space this year. We
are in day 4 of the teachers institute and will be wrapping up the day with
some last minute satellite contact opportunities. But over the last three
days, your support in making contacts with the teachers, and in particular,
the dedicated SSTV activity on AO51 last night, has made the TI-2 Space a
huge success this year. I wish each of you could have seen the glowing
light bulbs in the teachers' heads at each successful satellite contact. I
am confident that they will be taking what they learned this week back into
their classrooms to make space "alive" for their students. Thanks for the
patience you showed as these novice satellite operators learned the tricks
of the trade. I can tell you that I am warn out (in a good way)
facilitating their learning experience. (It is also a hoot to see 8
satellite ground stations, and antennas operating at one time.) I think we
may have a record of "work around the table via satellite" awards.
Thanks again for your support, and I'll be seeing you on the birds when I
recover and am back at the home QTH next week.
Mark
Mark Spencer, WA8SME
Education and Technology Program Coordinator
ARRL, the national association for Amateur RadioT
mspencer@xxxx.xxx
www.arrl.org/education-technology-program
www.arrl.org/teachers-institute-on-wireless-technology
530-495-9150
------------------------------
Message: 11
Date: Thu, 15 Jul 2010 10:43:27 -0400
From: "CE3SOC Raul Romero" <ce3soc@xxxxx.xxx>
Subject: [amsat-bb] ISS Picture SSTV Martin 1 14:02UTC
To: <amsat-bb@xxxxx.xxx>
Cc: LUSAT-1@xxxxxxxxxxx.xxx.xxx sarex@xxxxx.xxxx
ISSFANCLUBEBRASIL@xxxxxxxxxxx.xxx.xx
Message-ID: <969B3A74FFB84F668E75E13BA6E0C3C1@xxxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Copied Only Receiver Icom IC-R1500 and Disconne Antenna
2 Pictured in Martin 1
http://www.facebook.com/editalbum.php?&aid=2066091&add=1&created=1#!/album.php
?aid=2066091&id=1161437350&ref=mf
Tnx
Raul
CA3SOC
------------------------------
Message: 12
Date: Thu, 15 Jul 2010 23:56:10 +0800
From: "Alan Kung" <alankung@xxxxxxx.xxx.xxx.xx>
Subject: [amsat-bb] HO-68 Schedule -18-25 July 2010
To: <amsat-bb@xxxxx.xxx>
Message-ID: <003701cb2436$730ee120$6c01a8c0@xxxxxxxxxxx>
Content-Type: text/plain; charset="gb2312"
UTC:
18 July 2010
================================
17:20...Turn On--FM/PACSAT
India, Africa, Middle East,
Europe,NA
18:05...Turn Off
19:05...Turn On--FM/PACSAT
Africa,Europe,Middle East,NA
19:50...Turn Off
20:30...Turn On--FM/PACSAT
Africa,Europe,Middle East,NA
21:15...Turn Off
19 July 2010
================================
00:25...Turn On--FM/PACSAT
South America,NA,North Asia
01:10...Turn Off
02:52...Turn On--FM/PACSAT
North Asia,East Asia,South Asia
03:08...Turn Off
11:05...Turn On--FM/PACSAT
Oceania,India,South Asia,
Middle East,Europe,North Asia
11:50...Turn Off
17:00...Turn On--FM/PACSAT
Africa,Europe,NA
17:45...Turn Off
22:50...Turn On--FM/PACSAT
South America,NA,North Asia
23:35...Turn Off
20 July 2010
================================
00:40...Turn On--FM/PACSAT
South America,NA,North Asia
01:25...Turn Off
02:35...Turn On--FM/PACSAT
North Asia, East Asia, South Asia
02:51...Turn Off
10:50...Turn On--FM/PACSAT
Oceania,Asia,Europe
11:35...Turn Off
13:30...Turn On--FM/PACSAT
NA,Europe,Africa,South America
14:15...Turn Off
16:45...Turn On--FM/PACSAT
India,Middle East,Europe,NA
17:30...Turn Off
18:15...Turn On--FM/PACSAT
Africa,Europe,NA
19:00...Turn Off
21 July 2010
=================================
02:23...Turn On--FM/PACSAT
North Asia,East Asia,South Asia
02:39...Turn Off
10:35...Turn On--FM/PACSAT
Oceania,East Asia,North Asia,Europe
11:20...Turn Off
13:15...Turn On--FM/PACSAT
Oceania,East Asia,North Asia,Europe
14:00...Turn Off
16:25...Turn On--FM/PACSAT
Africa,Europe,NA
17:10...Turn Off
22:20...Turn On--FM/PACSAT
NA,North Asia,East Asia,Oceania
23:05...Turn Off
22 July 2010
=================================
02:05...Turn On--FM/PACSAT
North Asia,East Asia,South Asia
02:21...Turn Off
05:35...Turn On--FM/PACSAT
NA,North Asia,Middle East,
Europe,Africa
06:20...Turn Off
10:15...Turn On--FM/PACSAT
Oceania,Asia,Europe,NA
11:00...Turn Off
12:55...Turn On--FM/PACSAT
Europe,NA,South America
13:40...Turn Off
16:05...Turn On--FM/PACSAT
Africa,India,Middle East,Europe,NA
16:50...Turn Off
18:00...Turn On--FM/PACSAT
Africa,Europe,NA
18:45...Turn Off
22:00...Turn On--FM/PACSAT
Oceania,Asia,Europe,NA
22:45...Turn Off
23 July 2010
================================
01:50...Turn On--FM/PACSAT
North Asia,East Asia,South Asia
02:06...Turn Off
10:00...Turn On--FM/PACSAT
Oceania,Asia,Europe,NA
10:45...Turn Off
12:40...Turn On--FM/PACSAT
Europe,NA,South America
13:25...Turn Off
17:40...Turn On--FM/PACSAT
India,Africa,Europe,NA
18:25...Turn Off
21:40...Turn On--FM/PACSAT
South America,Africa,NA,
Europe,North Asia,East Asia
22:25...Turn Off
24 July 2010
================================
00:40...Turn On--FM/PACSAT
South America,NA,North Asia
01:25...Turn Off
01:32...Turn On--FM/PACSAT
North Asia,East Asia,South Asia
01:46...Turn Off
11:30...Turn On--FM/PACSAT
Oceania,Asia,Europe,NA
12:15...Turn Off
14:05...Turn On--FM/PACSAT
Europe,NA,South America
14:50...Turn Off
17:20...Turn On--FM/PACSAT
Africa,Europe,NA
18:05...Turn Off
23:15...Turn On--FM/PACSAT
South America,NA,North Asia
24:00...Turn Off
25 July 2010
================================
00:50...Turn On--FM/PACSAT
North Asia,East Asia,South Asia
01:35...Turn Off
06:30...Turn On--FM/PACSAT
North Asia,Europe,Africa
07:15...Turn Off
13:50...Turn On--FM/PACSAT
Europe,NA,South America
14:35...Turn Off
73
Alan Kung, BA1DU
HO-68(XW-1) Project Manager
www.camsat.cn
------------------------------
_______________________________________________
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 305
****************************************
Read previous mail | Read next mail
| |
