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CX2SA > SATDIG 28.09.09 10:20l 939 Lines 31142 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: All Satellites (Alan P. Biddle) (Bruce Robertson)
2. FO-29 (Vincenzo Mone)
3. Re: FO-29 (Eric Knaps)
4. Re: All Satellites (Alan P. Biddle) (Gordon JC Pearce)
5. Re: FO-29 (Bruce Robertson)
6. TLE lottery September 27th (Mike Rupprecht)
7. Re: Wanted: simple ISS tracking page (Andrew Rich)
8. Re: keps (Nigel Gunn G8IFF/W8IFF)
9. Operation from BOUNTY (Doug Faunt N6TQS +1-510-655-8604)
10. Re: OT: Displays Lamps for TS-790E (Tim Tuck)
11. Re: All Satellites (Alan P. Biddle) (Jim Walls)
12. SAT32PC issue-sat drops off (D. Craig Fox)
13. Re: All Satellites (Alan P. Biddle) (Bruce Robertson)
14. W6ZQ's activity from Hawaii tonight
(Patrick STODDARD (WD9EWK/VA7EWK))
15. Satellite Orbit Prediction in Python (Mark VandeWettering)
16. Sumbandila blog (Pieter Kotze)
17. Re: Satellite Orbit Prediction in Python (Rich Dailey (Gmail))
----------------------------------------------------------------------
Message: 1
Date: Sun, 27 Sep 2009 16:02:51 -0300
From: Bruce Robertson <ve9qrp@xxxxx.xxx>
Subject: [amsat-bb] Re: All Satellites (Alan P. Biddle)
To: Gordon JC Pearce <gordonjcp@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<49657a760909271202t151742esbc2477be79db4db4@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
On Sun, Sep 27, 2009 at 7:14 AM, Gordon JC Pearce <gordonjcp@xxxx.xxx> wrote:
> On Fri, 2009-09-25 at 22:19 -0400, Robert Bruninga wrote:
>> >> At a SmallSat conference... this summer,
>> >> I was amused at the casual assumption by
>> >> a researcher that 50, cubesats could be
>> >> launched as part of an upper atmosphere
>> >> project using ham frequencies for the
>> >> downlinks.
>>
>> And wouldn?t it be a hoot if everyone of them could put their
>> RX/TX into a bent-pipe packet mode, and then we would have
>> amateur radio global hand-held text messaging satellite
>> system...
>>
>> >> ?(They would have a lifetime of only 3-4 months.)
>>
>> But it would be FUN for a while!
>>
>> Using some of the 2-way very small micro APRS packet systems, a
>> 2 to 5 Watt transponder will easily fit on a singl circuit card
>> in a small cubesat. ?See ?www.aprs.org/cubesat-comms.html
>>
>> Bob, WB4APR
>
> If you could have maybe five or six cubesats with an FM transponder
> orbiting in such a way that there was a good 15-minute pass every hour,
> then I suspect that would work wonders for getting people interested in
> satellites again. ?The technical requirements for getting into them
> would be low enough for "entry-level" amateurs all over the world to
> have a crack at them - dual-band HT and a homebrew Arrow clone, and
> you're good to go. ?Cheap, simple satellites, and cheap, simple ground
> stations. ?How many could you fly for the cost of one HEO sat and
> launch?
>
> Gordon MM0YEQ
>
In a recent conversation on this list, I did the math and
conservatively estimated that 125 1U cubesats could be launched for
the current quoted price of a HEO launch alone.
The more I think about this digital cubesat constellation proposal,
the more I see its merits. Beyond the plain fact that it is
financially doable, as an emergency services platform it would be
genuinely useful, since even a low LEO will provide communication
outside the disaster zone in most cases, and compared to a HEO setup,
it would have the advantage of being usable for nearly every ham
anywhere.
The problem, as I think Bob has noted before, is momentum: a
constellation of these is very useful; one of them is much less so.
The group that puts up the first of them, then, is not doing much of
interest and hopes that others will follow to increase the 'network
effect'. For this reason, we cannot expect (most) university cubesat
missions to look merely like this, unless their institution has a
special interest in emergency communications, as Bob's uniquely is.
Perhaps we could turn the tables and offer university groups a small
amount of space in the cube for an experiment in exchange for
defraying the launch cost. Those universities that are especially
interested in the natural science side might jump at this, and doubly
so if they knew that they'd have an international APRS network
collecting their data. We could play the role of IntelSat for a change
:-)
KD6OZH's mentioning of a 1200 bps voice codec is very interesting,
too. I see that DSTAR's AMBE is down to 2000 with error correction,
and Speex operates down to 2000, too, though I think without error
correction. (I find the latter much more engaging as a ham, since it
is open source.) It would be a hoot to do a voice conference over the
Internet using a sample of low bitrate codecs and just get a sense of
what might be possible. One downside of voice is that it would occupy
the transponder far more than messaging, and Bob's favorable power
calculations would need to be estimated downwards.
I guess another aspect of the cubesat approach is that the cost of
failure is much lower. If a low bitrate audio codec doesn't really
work well, it would be a less expensive enterprise and easier to chalk
up to experience.
73, Bruce
VE9QRP
------------------------------
Message: 2
Date: Sun, 27 Sep 2009 21:38:25 +0200
From: "Vincenzo Mone" <vimone@xxxxx.xx>
Subject: [amsat-bb] FO-29
To: <amsat-bb@xxxxx.xxx>
Message-ID:
<!&!AAAAAAAAAAAYAAAAAAAAALgqrd2N1rRAiaQvRd7pgRDCgAAAEAAAAOZw9OxkpBBCq9G05l82Ay
YBAAAAAA==@xxxxx.xx>
Content-Type: text/plain; charset="us-ascii"
Hello,
I would like to know if the FO-29 is working or not.
Thanks
73 de Enzo IK8OZV
EasyLog 5 BetaTester
EasyLog PDA BetaTester
WinBollet BetaTester
D.C.I. CheckPoint Regione Campania
Skype: ik8ozv8520
***************************************
***** GSM +39 338 9749786 *****
***** SMS +39 338 9749786 *****
***** FAX +39 328 7244294 *****
*** 2nd e-mail: vimone@xxx.xx ***
***************************************
------------------------------
Message: 3
Date: Sun, 27 Sep 2009 22:17:16 +0200
From: Eric Knaps <eric.knaps@xxxxxxx.xx>
Subject: [amsat-bb] Re: FO-29
To: amsat-bb@xxxxx.xxx
Message-ID: <4ABFC84C.7080300@xxxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I also would like to know. I have not heard it for a while...
73, ON4HF,
Eric Knaps
Waterstraat 30
B-3980 Tessenderlo
Belgium
Tel. +32472985876 (mobile)
http://www.on4hf.be
Vincenzo Mone schreef:
> Hello,
> I would like to know if the FO-29 is working or not.
> Thanks
>
> 73 de Enzo IK8OZV
> EasyLog 5 BetaTester
> EasyLog PDA BetaTester
> WinBollet BetaTester
> D.C.I. CheckPoint Regione Campania
> Skype: ik8ozv8520
>
>
>
>
> ***************************************
> ***** GSM +39 338 9749786 *****
> ***** SMS +39 338 9749786 *****
> ***** FAX +39 328 7244294 *****
> *** 2nd e-mail: vimone@xxx.xx ***
> ***************************************
>
>
> _______________________________________________
> 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: 4
Date: Sun, 27 Sep 2009 21:32:12 +0100
From: Gordon JC Pearce <gordonjcp@xxxx.xxx>
Subject: [amsat-bb] Re: All Satellites (Alan P. Biddle)
To: amsat-bb@xxxxx.xxx
Message-ID: <1254083532.2557.8.camel@xxxxxxxxx.xxxxxxxxxxx>
Content-Type: text/plain
On Sun, 2009-09-27 at 16:02 -0300, Bruce Robertson wrote:
> In a recent conversation on this list, I did the math and
> conservatively estimated that 125 1U cubesats could be launched for
> the current quoted price of a HEO launch alone.
I think Bob Bruniga mentioned something like $400 to build a packet
satellite. If that's correct - $400 per unit - then I will split in
$100 to get the first one started (and more, if the exchange rate swings
in my favour again).
> The problem, as I think Bob has noted before, is momentum: a
> constellation of these is very useful; one of them is much less so.
> The group that puts up the first of them, then, is not doing much of
> interest and hopes that others will follow to increase the 'network
> effect'. For this reason, we cannot expect (most) university cubesat
> missions to look merely like this, unless their institution has a
> special interest in emergency communications, as Bob's uniquely is.
I personally have no interest in emergency comms, but I would like to
see useful packet satellites. If they're that cheap to build, then we
should have a big stack of them ready to fly.
> KD6OZH's mentioning of a 1200 bps voice codec is very interesting,
> too. I see that DSTAR's AMBE is down to 2000 with error correction,
> and Speex operates down to 2000, too, though I think without error
> correction. (I find the latter much more engaging as a ham, since it
> is open source.) It would be a hoot to do a voice conference over the
> Internet using a sample of low bitrate codecs and just get a sense of
> what might be possible. One downside of voice is that it would occupy
> the transponder far more than messaging, and Bob's favorable power
> calculations would need to be estimated downwards.
Would the packet satellite be capable of bent-pipe operation though?
You'd need to transmit and receive simultaneously to get that working.
I'd far prefer to use Speex rather than the locked-down proprietary AMBE
codecs.
> I guess another aspect of the cubesat approach is that the cost of
> failure is much lower. If a low bitrate audio codec doesn't really
> work well, it would be a less expensive enterprise and easier to chalk
> up to experience.
You could also just blow new firmware on it remotely. If it bricked,
that's a shame but at least you tried...
Gordon MM0YEQ
------------------------------
Message: 5
Date: Sun, 27 Sep 2009 17:37:17 -0300
From: Bruce Robertson <ve9qrp@xxxxx.xxx>
Subject: [amsat-bb] Re: FO-29
To: Eric Knaps <eric.knaps@xxxxxxx.xx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<49657a760909271337w5ee4c3a6l7af327b4b172b939@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
On Sun, Sep 27, 2009 at 5:17 PM, Eric Knaps <eric.knaps@xxxxxxx.xx> wrote:
> I also would like to know. I have not heard it for a while...
>
> 73, ON4HF,
>
> Eric Knaps
> Waterstraat 30
> B-3980 Tessenderlo
> Belgium
You'll find the site http://oscar.dcarr.org/ to be very helpful for
these sorts of questions. It seems that the last reported signals
heard were on the 25th. I guess that means they're still working on
reconfiguring it.
You can add your observations to David's website, too, just by filling
in the form.
73, Bruce
VE9QRP
> Tel. +32472985876 (mobile)
>
> http://www.on4hf.be
>
>
>
> Vincenzo Mone schreef:
>> Hello,
>> I would like to know if the FO-29 is working or not.
>> Thanks
>>
>> 73 de Enzo IK8OZV
>> EasyLog 5 BetaTester
>> EasyLog PDA BetaTester
>> WinBollet BetaTester
>> D.C.I. CheckPoint Regione Campania
>> Skype: ik8ozv8520
>>
>>
>>
>>
>> ? ? ? ***************************************
>> ? ? ? ***** ? ?GSM ?+39 338 9749786 ? ? *****
>> ? ? ? ***** ? ?SMS ?+39 338 9749786 ? ? *****
>> ? ? ? ***** ? ?FAX ?+39 328 7244294 ? ? *****
>> ? ? ? *** ? ?2nd e-mail: vimone@xxx.xx ? ?***
>> ? ? ? ***************************************
>>
>>
>> _______________________________________________
>> 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
>>
>>
>>
> _______________________________________________
> 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: 6
Date: Sun, 27 Sep 2009 23:05:39 +0200
From: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>
Subject: [amsat-bb] TLE lottery September 27th
To: "'Amsat-BB'" <amsat-bb@xxxxx.xxx>
Message-ID: <003f01ca3fb6$449629d0$cdc27d70$@xx>
Content-Type: text/plain; charset="us-ascii"
my new assignment from this day onwards
BEESAT
1 35934U 09051D 09269.68120117 .00003302 00000-0 81574-3 0 66
2 35934 098.3288 004.3565 0005573 295.8442 064.2169 14.52717731 502
SWISSCUBE
1 35932U 09051B 09269.40698594 .00005218 00000-0 12986-2 0 61
2 35932 098.3356 004.0898 0007064 277.3767 082.6492 14.52117154 454
UWE-2
1 35933U 09051C 09269.33689778 .00007796 00000-0 19109-2 0 76
2 35933 098.3346 004.0205 0004530 289.2313 070.8246 14.52686952 442
ITUPSAT1
1 35935U 09051E 09269.75149288 .00001930 00000-0 48744-3 0 62
2 35935 098.3414 004.4366 0007021 277.0543 082.9840 14.52119405 505
73, Mike
DK3WN
------------------------------
Message: 7
Date: Mon, 28 Sep 2009 07:49:41 +1000
From: "Andrew Rich" <vk4tec@xxxxx.xxx>
Subject: [amsat-bb] Re: Wanted: simple ISS tracking page
To: "Joe" <nss@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <80F3E47FC9FF41C2967AABB81E4C055C@xxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Done
http://vk4tec.no-ip.org/sat_status/
----------------------------------------------------------
Andrew Rich
Airways Technical Officer Grade 4
Surveillance - RADAR ADS-B
Amateur Radio Callsign VK4TEC
email: vk4tec@xxxxxxxxxxxxx.xxx
web: www.tech-software.net
----- Original Message -----
From: Joe
To: Andrew Rich
Cc: amsat-bb@xxxxx.xxx
Sent: Monday, September 28, 2009 1:11 AM
Subject: Re: [amsat-bb] Wanted: simple ISS tracking page
Heavans Above?
Andrew Rich wrote:
I am looking for a simple tracking display for my sat_status site
Ideas ?
I see a few but they are surrounded by goobly goop
----------------------------------------------------------
Andrew Rich
Airways Technical Officer Grade 4
Surveillance - RADAR ADS-B
Amateur Radio Callsign VK4TEC
email: vk4tec@xxxxxxxxxxxxx.xxx
web: www.tech-software.net
_______________________________________________
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
----------------------------------------------------------------------------
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.416 / Virus Database: 270.13.113/2397 - Release Date: 09/26/09
17:51:00
------------------------------
Message: 8
Date: Sun, 27 Sep 2009 22:25:47 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: keps
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <4ABFE66B.7070906@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
OBJECT B
1 35866U 09049B 09269.72996406 +.00000178 +00000-0 +10000-3 0 00125
2 35866 098.8007 319.8923 0004089 055.3536 304.8008 14.22296028001285
FREGAT/IRIS
1 35867U 09049C 09269.73110771 +.00002263 +00000-0 +10000-3 0 00228
2 35867 097.3725 319.6376 0008863 258.6612 101.3447 15.22710841001376
TATIANA-2 (RS-28)
1 35868U 09049D 09269.80165911 +.00000177 +00000-0 +10000-3 0 00113
2 35868 098.7998 319.9570 0005066 042.4864 317.6631 14.22084863001298
OBJECT E
1 35869U 09049E 09269.80233640 +.00000176 +00000-0 +10000-3 0 00118
2 35869 098.7991 319.9531 0005530 052.2194 307.9359 14.21977906001297
SUMBANDILA
1 35870U 09049F 09269.95037156 +.00002270 +00000-0 +10000-3 0 00207
2 35870 097.3737 319.8460 0009848 263.9725 220.1494 15.22803793001402
BLITS
1 35871U 09049G 09269.73399688 +.00000174 +00000-0 +10000-3 0 00071
2 35871 098.8005 319.8831 0004307 054.6872 305.4704 14.21536552000675
OCEANSAT 2
1 35931U 09051A 09270.02817502 .00005982 00000-0 15388-2 0 81
2 35931 098.3363 004.6997 0001110 235.0578 121.6696 14.50500283 541
SWISSCUBE
1 35932U 09051B 09269.75151502 +.00005219 +00000-0 +12986-2 0 00074
2 35932 098.3367 004.4323 0007042 275.0402 084.9893 14.52119461000510
UWE-2
1 35933U 09051C 09269.75016994 +.00007797 +00000-0 +19109-2 0 00088
2 35933 098.3342 004.4307 0004574 288.0186 072.0499 14.52693268000518
BEESAT
1 35934U 09051D 09269.68120117 .00003302 00000-0 81574-3 0 66
2 35934 098.3288 004.3565 0005573 295.8442 064.2169 14.52717731 502
ITUPSAT-1
1 35935U 09051E 09269.75149288 .00001930 00000-0 48744-3 0 62
2 35935 098.3414 004.4366 0007021 277.0543 082.9840 14.52119405 505
RUBIN 9.1/RUBIN 9.2/PSLV
1 35936U 09051F 09269.70901186 .00006760 00000-0 20799-2 0 66
2 35936 098.2920 004.2619 0055380 210.1601 149.6373 14.40927505 495
Nigel Gunn G8IFF/W8IFF wrote:
> This is believed to be the correct assimilation of satellites and
keplerian data but your ideas are welcome if you know
> different.
>
>
>
> OBJECT B
> 1 35866U 09049B 09268.81543336 +.00000178 +00000-0 +10000-3 0 00124
> 2 35866 098.8005 318.9799 0004138 058.5223 301.6358 14.22295962001152
> FREGAT/IRIS
> 1 35867U 09049C 09268.74538420 +.00002263 +00000-0 +10000-3 0 00212
> 2 35867 097.3734 318.6711 0008878 261.5428 098.4699 15.22710402001224
> OBJECT D
> 1 35868U 09049D 09268.67591709 +.00000177 +00000-0 +10000-3 0 00115
> 2 35868 098.8000 318.8342 0005055 046.7677 313.3922 14.22084680001131
> OBJECT E
> 1 35869U 09049E 09268.67650979 +.00000176 +00000-0 +10000-3 0 00110
> 2 35869 098.7994 318.8303 0005357 059.0277 301.1426 14.21977871001134
> SUMBANDILA
> 1 35870U 09049F 09270.20616178 .00002270 00000-0 10000-3 0 204
> 2 35870 097.3742 320.0972 0009944 262.6951 182.7760 15.22803372 1440
> BLITS
> 1 35871U 09049G 09268.81897891 +.00000174 +00000-0 +10000-3 0 00078
> 2 35871 098.8007 318.9711 0004315 057.6044 302.5550 14.21536047000549
> OCEANSAT 2
> 1 35931U 09051A 09270.02817502 .00005982 00000-0 15388-2 0 81
> 2 35931 098.3363 004.6997 0001110 235.0578 121.6696 14.50500283 541
> SWISSCUBE
> 1 35932U 09051B 09268.85574039 +.00005218 +00000-0 +12986-2 0 00066
> 2 35932 098.3371 003.5431 0006954 278.9858 081.0464 14.52113471000385
> BEESAT
> 1 35933U 09051C 09268.85474484 +.00007796 +00000-0 +19109-2 0 00089
> 2 35933 098.3344 003.5409 0004613 299.5176 060.5543 14.52686161000384
> ITUPSAT-1
> 1 35934U 09051D 09269.68120117 .00003302 00000-0 81574-3 0 66
> 2 35934 098.3288 004.3565 0005573 295.8442 064.2169 14.52717731 502
> UWE-2
> 1 35935U 09051E 09269.75149288 .00001930 00000-0 48744-3 0 62
> 2 35935 098.3414 004.4366 0007021 277.0543 082.9840 14.52119405 505
> RUBIN 9.1/RUBIN 9.2/PSLV
> 1 35936U 09051F 09269.70901186 .00006760 00000-0 20799-2 0 66
> 2 35936 098.2920 004.2619 0055380 210.1601 149.6373 14.40927505 495
>
>
>
>
>
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.409 / Virus Database: 270.13.113/2397 - Release Date:
09/26/09 17:51:00
>
--
Nigel A. Gunn, 1865 El Camino Drive, Xenia, OH 45385-1115, USA. tel +1 937
825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF), e-mail nigel@xxxxx.xxx www
http://www.ngunn.net
Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pigs QRP
Club International #385,
Dayton ARA #2128, AMSAT-NA LM-1691, AMSAT-UK 0182, MKARS, ALC,
GCARES, XWARN.
------------------------------
Message: 9
Date: Sun, 27 Sep 2009 22:11:29 +0000
From: Doug Faunt N6TQS +1-510-655-8604 <faunt@xxxxx.xxx>
Subject: [amsat-bb] Operation from BOUNTY
To: amsat-bb@xxxxx.xxx
Message-ID: <4ABFE311.1080109@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I'll try to operate the FM sats from BOUNTY, http://tallshipbounty.org,
as we sail from Galway to St Petersburg, Florida over the next 6 to 8 weeks.
I have my IC-W31 and an Arrow antenna. I've not been on for a long
time, so we'll see how it goes. The location of the ship is availabloe
from its web site, and I'll be recording the contacts.
73, doug
------------------------------
Message: 10
Date: Mon, 28 Sep 2009 08:39:51 +1000
From: "Tim Tuck" <timt@xxxxxxx.xxx>
Subject: [amsat-bb] Re: OT: Displays Lamps for TS-790E
To: Vincenzo Mone <vimone@xxxxx.xx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4ABFE9B7.80203@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Vincenzo Mone wrote:
> Hi Folks,
> sorry for the OT message.
> I am looking for the displays Blubs lamps and the sitting rubbers
> For my Kenwood TS-790E RTX.
> Anybody can point me where to find them?
> Thanks in advance.
>
>
Hi Vincenzo,
Can I make a suggestion ?
Instead of looking for replacement lamps for it, replace them with LEDs.
I had an old Kenwood 2m FM rig that had a similar problem and replaced
them with nice green LEDs.
The bulbs in my azel rotator controllers failed to and I replaced them
with strings of red LED's, looks very nice :)
You will find LED's of many sizes and light output these days so it
wouldn't be too hard to find one to suit.
You can mount them in small rubber grommets or use a small dab of
silicone sealant to secure them in place.
regards
Tim
--
VK2XTT :: QF56if :: BMARC :: WIA :: AMSAT-VK :: AMSAT
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Scanned with Copfilter Version 0.84beta3a (ProxSMTP 1.6)
AntiVirus: ClamAV 0.91.2/9842 - Sun Sep 27 22:30:31 2009
by Markus Madlener @ http://www.copfilter.org
------------------------------
Message: 11
Date: Sun, 27 Sep 2009 18:28:41 -0700
From: Jim Walls <jim@xxxxx.xxx>
Subject: [amsat-bb] Re: All Satellites (Alan P. Biddle)
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <4AC01149.4050103@xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252; format=flowed
Bruce Robertson wrote:
> In a recent conversation on this list, I did the math and
> conservatively estimated that 125 1U cubesats could be launched for
> the current quoted price of a HEO launch alone.
>
> The more I think about this digital cubesat constellation proposal,
> the more I see its merits.
I guess that would be if you had the slightest interest in digital
satellite operation. Personally I have absolutely ZERO interest in
digital satellite operation, only very little in the single channel FM
birds, a lot more in linear LEO birds, and even more in linear HEO
birds. For the most part, I don't care about DXing, but actually being
able to talk to someone for more than a few minutes is rather nice. I
will admit that I was happy to get Africa confirmed to complete my
Satellite Worked All Continents a few years ago - only to have the ARRL
lose the cards.
--
73
-------------------------------------
Jim Walls - K6CCC
jim@xxxxx.xxx
Ofc: 818-548-4804
http://home.earthlink.net/~k6ccc
AMSAT Member 32537 - WSWSS Member 395
------------------------------
Message: 12
Date: Sun, 27 Sep 2009 20:39:30 -0700
From: "D. Craig Fox" <DFox@xxxxxx.xxx>
Subject: [amsat-bb] SAT32PC issue-sat drops off
To: <amsat-bb@xxxxx.xxx>
Message-ID:
<A8E6E57AFA652D419A823F42AD6ACBDE02EB9F02@xxxxxxxxx.xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
hello all on this distinguished listserv!
I love staying in the loop thru this listerv. But I digress. Recently I
notice that VO52 has been getting dropped off of my sat 32 pc sat list. I
have to make a point of adding it back on. This never used to happen.
Any clues/suggestions? Thanks in advance!
Craig
N6RSX
AMSAT # 36607
-
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------------------------------
Message: 13
Date: Mon, 28 Sep 2009 00:44:32 -0300
From: Bruce Robertson <ve9qrp@xxxxx.xxx>
Subject: [amsat-bb] Re: All Satellites (Alan P. Biddle)
To: k6hx@xxxx.xxxx kf6kyi@xxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<49657a760909272044m222881beq1501d96650e30ca2@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
On Fri, Sep 25, 2009 at 7:15 PM, Mark VandeWettering <kf6kyi@xxxxx.xxx> wrote:
>>
>> At a SmallSat conference I attended on behalf of AMSAT this summer, I was
>> amused at the casual assumption by a researcher that 50, Five Oh, cubesats
>> could be launched as part of an upper atmosphere project using ham
>> frequencies for the downlinks. ?(They would have a lifetime of only 3-4
>> months.) ?Jan King, W3GEY/VK4GEY, who does coordination of satellite
>> frequencies, gently but firmly brought them down to earth a bit.
>>
>> On the one hand, we get new hams with interests in space communications
from
>> these projects, but on the other we need to prevent the de facto
>> appropriation of needed frequencies. ?A fine line to walk.
>>
>> Alan
>> WA4SCA
Tell them they can put up 500, as long as the downlink is on S-band :-)
73, Bruce
VE9QRP
------------------------------
Message: 14
Date: Sun, 27 Sep 2009 21:54:58 -0700 (PDT)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] W6ZQ's activity from Hawaii tonight
To: amsat-bb@xxxxx.xxx
Message-ID: <747726.85121.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
As "advertised", Ron W6ZQ made another appearance on AO-51
this evening from Kauai. Tonight, he worked from grid BL01,
and made contacts with 10 stations and almost completed an
11th QSO on this pass. For the first time during this trip,
Ron worked a couple of VE6 stations from Kauai (VE6EGN and
VE6ITV). Alaska was also represented; Craig KL4E in Alaska
made a QSO with W6ZQ just before Hawaii went out of AO-51's
footprint.
This was the last time Ron will be on the satellites from
Hawaii on this trip, as he will be returning home on Wednesday.
Ron - thanks for all your efforts to be on many passes from
Kauai, plus the pass from the "big island" last week, during
your vacation. Now if we could get someone on AO-7 from out
there...
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 15
Date: Sun, 27 Sep 2009 23:06:18 -0700
From: Mark VandeWettering <kf6kyi@xxxxx.xxx>
Subject: [amsat-bb] Satellite Orbit Prediction in Python
To: amsat-bb@xxxxx.xxx
Message-ID:
<d8eb7a910909272306y4aee2a9ey711c9cbdfc0c77e6@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I just thought I'd drop a quick note here about some fun I've been
having today with satellite orbit prediction in Python. When I
started mucking around with satellites, I used "predict", which was
pretty good, but at some point I wanted to answer some questions which
weren't easy to answer using predict. Questions like "when will
AO-51 be visible from both my home in CM87 and locations in Hawaii",
or "what was the radius of the circle of visibility for AO-7 compared
to ISS"?
Luckily, I'm a programmer. In fact, I'm a programmer who programs
for fun. So, I did a bit of research, and then coded up a version of
G3RUH's "Plan 13" algorithm in Python, and then wrote some scripts to
download elements from celestrak, and then a simple one to print data
on the next pass of any named satellite. And, they worked pretty
good. I've used them for the last year or so to do all my pass
predictions. But there are still a couple of minor issues with the
library. It didn't handle geosynchronous satellites very well. It
implemented only the most basic of orbital models. I was never
confident that the "is this satellite in eclipse" stuff working
exactly right.
Luckily though, it turns out that someone else has been busy writing a
more complete library: PyEphem http://rhodesmill.org/pyephem/
It's a library whose primary purpose is to calculate the positions of
astronomical objects. I've used it a couple of times to (for
instance) figure out the size of Mars compared to Jupiter, and found
it very easy to use. But today, I realized that it had a full
implementation of the SGP4 and SDP4 orbital models built in, and could
be used to predict satellite passes. As a proof of concept, I
hacked together a 23 line script that could print the details of
upcoming ISS passes. It seems to work great, and is really quite
easy to use.
You can find some of the simple example code at my blog:
http://brainwagon.org/2009/09/27/how-to-use-python-to-predict-satellite-locati
ons/
I'll probably be porting all of my existing scripts to use this soon.
In the mean time, if you have a similar task, you might look to it to
solve your custom satellite prediction problems.
73 Mark K6HX
------------------------------
Message: 16
Date: Mon, 28 Sep 2009 09:52:52 +0200
From: "Pieter Kotze" <pkotze@xxxx.xx.xx>
Subject: [amsat-bb] Sumbandila blog
To: <amsat-bb@xxxxx.xxx>
Message-ID: <4AC08774.E155.0020.0@xxxx.xx.xx>
Content-Type: text/plain; charset=US-ASCII
For those who would like to keep up with what is happening see the following:
http://sumbandilamission.blogspot.com/
Regards
ZS1PK/M0PAK
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Message: 17
Date: Mon, 28 Sep 2009 04:12:12 -0400
From: "Rich Dailey (Gmail)" <redailey1@xxxxx.xxx>
Subject: [amsat-bb] Re: Satellite Orbit Prediction in Python
To: k6hx@xxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <7.0.0.16.2.20090928040129.023705b8@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Great stuff, Mark. I'm an old, dusty assembler, and later a C programmer.
Used to program for fun,
then for profit, then after a few years of life I looked around and the art
had snuck ahead of me.
I used to hack up the PREDICT code for my own devious purposes, and just to
have fun
with the source.
Your blog post reminded me of how fun it is to cobble together one's own
code to
solve a particular problem. Keep it up!
Rich, N8UX
Mark wrote:
>You can find some of the simple example code at my blog:
>
>http://brainwagon.org/2009/09/27/how-to-use-python-to-predict-satellite-locat
ions/
>
>I'll probably be porting all of my existing scripts to use this soon.
> In the mean time, if you have a similar task, you might look to it to
>solve your custom satellite prediction problems.
>
>73 Mark K6HX
>_______________________________________________
------------------------------
_______________________________________________
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End of AMSAT-BB Digest, Vol 4, Issue 503
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