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CX2SA > SATDIG 19.03.09 04:44l 366 Lines 10657 Bytes #999 (0) @ WW
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To : SATDIG@WW
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Today's Topics:
1. Re: Telemetry system on ISS, MM (Nate Duehr)
2. Re: old satellites (Chris Hackworth)
3. satellite demo & presentation, Thursday evening (19 March)
(Patrick STODDARD (WD9EWK/VA7EWK))
4. AO-51 (Michael Heim)
5. Re: AO-51 (Michael Heim)
6. AMSAT Awards (Bruce)
----------------------------------------------------------------------
Message: 1
Date: Tue, 17 Mar 2009 22:14:57 -0600
From: Nate Duehr <nate@xxxxxxxx.xxx>
Subject: [amsat-bb] Re: Telemetry system on ISS, MM
To: amsat <amsat-bb@xxxxx.xxx>
Message-ID: <17DA3919-802A-41CE-A89F-0AA84F527007@xxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
On Mar 17, 2009, at 6:09 AM, MM wrote:
> Link to audio:
> http://www.savefile.com/files/1655618
>
> One aircraft in recording:
>
http://registry.faa.gov/aircraftinquiry/NNumSQL.asp?NNumbertxt=38U&cmndfind.x=
0&cmndfind.y=0
>
> Jody
> North Georgia
Hi Jody,
Interesting recording.
The female voice clearly says, "Calling today, this is Memphis
Center?"... a Center controller picking up an aircraft in-flight,
probably for VFR "flight following" services, or she just missed a
call-up. Standard phraseology. Seems to match the "flight following"
thing since then...
The analysis of the tail number is incorrect. Later she talks a
couple of times to "Cessna 38U".
Tail numbers on-air are shortened to the last three characters of the
tail number, if no conflicting callsigns are on the frequency -- to
save airtime. Therefore that's not "N38U" as the full callsign (a
glider based out of Boulder, CO as you noted with the FAA registry),
but is a Cessna with a tail number ending in 38U, flying somewhere in
Memphis Center's controlled airspace.
At one point the flow of the conversation through standard phraseology
would indicate that the Cessna or another aircraft she's talking to is
at 5500' MSL. Making her a "low-altitude" sector at Memphis, or dual-
controlling (transmitting on more than one frequency) multiple
sectors, depending on time of day and traffic load.
There's also communications with a King Air, but I need to go get the
headphones out to pick that callsign out.
http://microvoltradio.com/ARTCC/KZME.htm
Right at the very end you also hear an aircraft call up "right
downwind", likely ISS has moved far enough East that Memphis Center
can no longer be heard, and the frequency is re-used by the FAA at a
towered airport somewhere further East.
At the very beginning of the recording, it sounds like the receiver is
wide enough that it's hearing some other stuff that's not on its
center frequency on the West Coast... or wherever the ground track
took ISS this particular day and time of this recording.
Thanks for sharing, neat to listen to...
--
Nate Duehr, WY0X
nate@xxxxxxxx.xxx
------------------------------
Message: 2
Date: Wed, 18 Mar 2009 00:35:58 -0400
From: Chris Hackworth <n8phucjh@xxxxx.xxx>
Subject: [amsat-bb] Re: old satellites
To: w7lrd@xxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<298264bf0903172135j6dc2bdbalf06ea99bd53ba73d@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Greetings,
Bit of a lurker here, but my day job is at a Satellite Earth station
for SES Americom, a satellite owner/operator.
Normally, when a satellite is about to run out of fuel, it is sent
into what is called a graveyard orbit, to keep it from drifting and
running into other satellites. It is boosted high above the
geosynchronous belt where it wont run into anything.
A satellite is usually hard wired for the frequencies in use. Up link
in the C band is usually 5.9 to 6.4 Ghz, and there are 24 TWTs, each
tuned to a 40 Mhz hunk of spectrum.So, Transponder 1 is the first 40,
transponder 2 is the second 40, etc....
At Ku band, it runs from 14 GHZ to 14.5 Ghz. sometimes the transponder
width is 40mhz, sometimes it is 54Mhz. again, the individual TWT is
tuned for its little slice.
All of this filtering is done pre and post amp by hard filters that
can not be changed from the ground.
Without command and control of the satellite, it is for all practical
purposes useless.
Chris Hackworth
N8PHU
On Thu, Mar 12, 2009 at 12:24 AM, <w7lrd@xxxxxxx.xxx> wrote:
> Hello
> I believe this subject has been kicked around on this BB before. ?It did
generate some creative thinking. ?Given ?all the satellites up there and all
the varied uses of them, eventually some of them get compromised for whatever
reason. ?Is there any way any of these old relics can be reprogramed, used or
otherwise "adjusted" to suit us? ?We don't need a real good S/N ?ratio to make
us happy, and we are pretty good at cobbling together whatever we want. ?We
have some very informed and smart people on this BB who know.
> 73 Bob W7LRD
> Seattle
> _______________________________________________
> 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
>
--
Chris N8PHU
ET1(SW) USN (Ret)
Chief transmitter Heavy SES-Americom
------------------------------
Message: 3
Date: Tue, 17 Mar 2009 22:04:06 -0700 (PDT)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] satellite demo & presentation, Thursday evening
(19 March)
To: amsat-bb@xxxxx.xxx
Message-ID: <133369.51380.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
I will be giving a satellite-related presentation for the
ThunderBird Amateur Radio Club in Glendale, Arizona, on Thursday, 19
March 2009. The meeting is in the Snell Building on the campus of
the Thunderbird School of Global Management, room 28. The campus is
on the southeast corner of 59th Avenue and Greenway Road - grid
DM33vo. The meeting starts at 7.00pm (0200 UTC), and my presentation
will be after the first half of the meeting - approximately 8.00pm.
Before the meeting, I will have a demonstration on AO-51. The
satellite will be in range between 6.33 and 6.47pm (0133-0147 UTC),
a high pass to my west. I will be on the 145.920/435.150 MHz
repeater, to allow anyone watching my demonstration listen in with a
2m/70cm FM transceiver.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 4
Date: Wed, 18 Mar 2009 04:53:39 -0700 (PDT)
From: Michael Heim <kd0ar@xxxxxxxxx.xxx>
Subject: [amsat-bb] AO-51
To: AMSAT-BB@xxxxx.xxx
Message-ID: <733075.53479.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Tuned into AO-51 this morning (around 11:50 UTC) and I couldnt hear either
transponder. Is everything ok up there or am I having problems?
Michael Heim
ARS KD0AR
------------------------------
Message: 5
Date: Wed, 18 Mar 2009 05:46:57 -0700 (PDT)
From: Michael Heim <kd0ar@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51
To: AMSAT-BB@xxxxx.xxx
Message-ID: <158262.24564.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
ok.. thanks Tim. Looks like I've got something I need to look at. Didnt
hear the S band downlink and I spot checked 435.150 with nothing heard. I'll
look again tonight. Thanks
Michael Heim
ARS KD0AR
________________________________
From: "n3tl@xxxxxxxxx.xxxx <n3tl@xxxxxxxxx.xxx>
To: Michael Heim <kd0ar@xxxxxxxxx.xxx>
Sent: Wednesday, March 18, 2009 8:26:03 AM
Subject: Re: [amsat-bb] AO-51
Hey Mike,
The 145.920/435.150 pair was up and working fine, albeit with only a few
stations in there. I heard N9AMW, NL7VX, WA4NVM and N5ZNL.
73,
Tim
-------------- Original message from Michael Heim <kd0ar@xxxxxxxxx.xxx>: -----
---------
> Tuned into AO-51 this morning (around 11:50 UTC) and I couldnt hear either
> transponder. Is everything ok up there or am I having problems?
>
> Michael Heim
> ARS KD0AR
>
> _______________________________________________
> 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: Wed, 18 Mar 2009 08:15:48 -0500
From: Bruce <kk5do@xxxxx.xxx>
Subject: [amsat-bb] AMSAT Awards
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <49C0F404.2070803@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
The beginning of 2009 has been the busiest for AMSAT Awards since I took
over processing awards in 2001.
We would like to welcome the following to the satellite community. They
have made their first satellite contact and are now members of the AMSAT
Satellite Communicators Club.
Jack Barbera, WA1ZDV
Marilyn Tillman, N4GMT
Mount Nebo VHF Contest Club, NE5BO
Rick Tillman, WA4NVM
Chris Meyers, KC0YBM
Richard Allen, N0CFL
The following have earned the AMSAT Satellite Communications Achievement
Award.
Mount Nebo VHF Contest Club, NE5BO #483
Rick Tillman, WA4NVM #484
David Webb, KB1PVH #485
The following have earned the AMSAT South Africa Satellite Communications
Achievement Award.
Douglas Anoman, KC9MLN #US130
Rick Tillman, WA4NVM #US131
David Webb, KB1PVH #US132
The following have upgraded their AMSAT Sexagesimal Satellite
Communication Achievement Award
Rick Tillman, WA4NVM #147
To see all the awards visit http://www.amsat.org or
http://www.amsatnet.com
Bruce Paige, KK5DO
AMSAT Director Contests and Awards
ARRL Awards Manager (WAS, 5BWAS, VUCC), VE
Houston AMSAT Net - Wed 0100z on SkyScanner Satellite Radio Network on
Galaxy-25 @xxx West, Transponder 23 (12115 Vert), Symbol Rate: 22425,
APID: 1794 (DVB Free To Air)
Also streaming MP3 at http://www.amsatnet.com
Podcast at http://www.amsatnet.com/podcast.xml or iTunes
Latest satellite news on the ARRL Audio News
http://www.arrl.org
------------------------------
_______________________________________________
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 4, Issue 133
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