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CX2SA > SATDIG 17.03.09 03:34l 768 Lines 25080 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: Orbiting Debris - Again (m5aka@xxxxx.xx.xxx
2. ISS Webcam Streaming Video (Trevor)
3. N3TL/portable tonight (n3tl@xxxxxxxxx.xxxx
4. Re: ISS Webcam Streaming Video
(Ransom, Kenneth G. (JSC-OC)[BARRIOS TECHNOLOGY])
5. Re: Shuttle Launch visible 3/15/09 (Bobby Lacey)
6. Re: ISS Webcam Streaming Video (Alan Sieg WB5RMG)
7. SwissCube Slide Show (m5aka@xxxxx.xx.xxx
8. Tranzit-B telemetry system on ISS (andy thomas)
9. Re: Tranzit-B telemetry system on ISS (MM)
10. S band downlink - AO-51 (Michael Heim)
11. NASA's DTN & SDR (Alan Sieg WB5RMG)
12. Re: Shuttle Launch visible 3/15/09 (MM)
13. Re: Tranzit-B telemetry system on ISS (Andrew Glasbrenner)
14. Re: S band downlink - AO-51 (Patrick STODDARD (WD9EWK/VA7EWK))
15. Re: S band downlink - AO-51 (Gould Smith)
16. Re: Tranzit-B telemetry system on ISS (Nate Duehr)
17. Re: N3TL/portable tonight (Bryan Green)
----------------------------------------------------------------------
Message: 1
Date: Mon, 16 Mar 2009 19:18:42 +0000 (GMT)
From: m5aka@xxxxx.xx.xx
Subject: [amsat-bb] Re: Orbiting Debris - Again
To: amsat-bb@xxxxx.xxx
Message-ID: <448045.24916.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
--- On Mon, 16/3/09, Rich Dailey <richdailey@xxxxxxxxxx.xxx> wrote:
> I try hard to maintain optimism, but I see this problem
> only getting much worse in the future.? Solutions?
One solution may be to put the ISS in a 1200 km orbit and thus above most of
the debris that originates from decaying sats and debris in 500-1000 km
orbits. The big drawback is that it would cost more per kilo to get payload up
there but once construction is completed there shouldn't be the need to ship
up so much stuff.
73 Trevor M5AKA
------------------------------
Message: 2
Date: Mon, 16 Mar 2009 19:27:37 +0000 (GMT)
From: Trevor <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] ISS Webcam Streaming Video
To: amsat-bb@xxxxx.xxx
Message-ID: <349300.10683.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
The ISS streaming video camera seems to be a great idea
http://www.southgatearc.org/news/march2009/iss_webcam.htm
Does anyone know if the camera is connected via cable or do they make use of a
WiFi connection ?
73 Trevor M5AKA
------------------------------
Message: 3
Date: Mon, 16 Mar 2009 19:33:09 +0000
From: n3tl@xxxxxxxxx.xxx
Subject: [amsat-bb] N3TL/portable tonight
To: AMSAT-BB@xxxxx.xxx
Message-ID:
<031620091933.8627.49BEA975000A219C000021B322216125569B0A02D2089B9A019C0
4040A0DBF049BCC02@xxx.xxx>
Content-Type: text/plain
Hey everyone,
I plan to operate AO-51 this evening (March 16 local time, March 17 UTC) from
South Carolina.
I should be in the footprint from around 00:15 UTC to 00:23 UTC (8:15 p.m. -
8:23 p.m., EDT) on 145.920 up/435.150 down.
If we work and you need a QSL card to confirm South Carolina, please email me.
I'll get a card on the way to you. No return card to me is necessary.
73 to all,
Tim - N3TL
Athens, Ga. - EM84ha
------------------------------
Message: 4
Date: Mon, 16 Mar 2009 15:13:29 -0500
From: "Ransom, Kenneth G. (JSC-OC)[BARRIOS TECHNOLOGY]"
<kenneth.g.ransom@xxxx.xxx>
Subject: [amsat-bb] Re: ISS Webcam Streaming Video
To: Trevor <m5aka@xxxxx.xx.xx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Message-ID:
<CBB2346C58D9B14983E5AEFE4B34588631834B72CF@xxxxxxxxx.xxx.xxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
It is not really a web camera in the standard use of the terminology. It is
the same live video from the ISS they use on NASA-TV but is made available via
the web whenever one of the ISS video feeds is available.
Kenneth - N5VHO
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf
Of Trevor
Sent: Monday, March 16, 2009 2:28 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ISS Webcam Streaming Video
The ISS streaming video camera seems to be a great idea
http://www.southgatearc.org/news/march2009/iss_webcam.htm
Does anyone know if the camera is connected via cable or do they make use of a
WiFi connection ?
73 Trevor M5AKA
_______________________________________________
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: 5
Date: Mon, 16 Mar 2009 16:29:42 -0400
From: Bobby Lacey <amsat@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Shuttle Launch visible 3/15/09
To: amsat-bb@xxxxx.xxx
Message-ID:
<8bb6b4b00903161329o6a246c10u144f472c0dce7841@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I was fortunate enough to watch the launch from the NASA causeway
again. The sunset lit plume was an amazing site. I posted a few photos
at http://www.flickr.com/photos/rllacey
73 de Bobby KF4GTA
http://www.nq4i.com
------------------------------
Message: 6
Date: Mon, 16 Mar 2009 15:53:44 -0500 (CDT)
From: "Alan Sieg WB5RMG" <wb5rmg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: ISS Webcam Streaming Video
To: amsat-bb@xxxxx.xxx
Message-ID: <3847.198.119.224.78.1237236824.squirrel@xxx.xxxxxxx.xxx>
Content-Type: text/plain;charset=iso-8859-1
Trevor M5AKA said :
> Does anyone know if the camera is connected via cable
> or do they make use of a WiFi connection ?
We'll assume you are speaking of the connections on ISS,
as it is most certainly wireless back to earth. TDRSS tho, not LinkSys.
They have several new HD video cameras mounted outside,
in addition to several indoor cameras. The Ku band downlink carries
4 simultaneous video channels, as selected by ground control or crew.
I'm not sure why this is considered new, as it seems like the same thing
they have been doing during crew sleep - showing lots of outside camera
views on NASA-TV as streaming video. I think maybe there is a new URL,
it's just that during Joint Ops they are showing Mission Coverage,
same as on the main public channel.
AhHa - looks like http://www.nasa.gov/multimedia/isslivestream.asx
by itself will kick open a Media Player window. Maybe after this shuttle
mission this new URL will not go back to the regular public channel content.
I love watching the earth ball rolling underneath ISS, and hope that
this new URL will give us more of that, and less 'NASA Edge' . . .
Thanks /;^)
--
<- Licensed in 1976, WB5RMG = Alan Sieg * AMSAT#20554 ->
<- http://www.somenet.net * http://wb5rmg.somenet.net ->
<- http://www.linkedin.com/in/alansieg * My 'Day Job' ->
------------------------------
Message: 7
Date: Mon, 16 Mar 2009 21:26:06 +0000 (GMT)
From: m5aka@xxxxx.xx.xx
Subject: [amsat-bb] SwissCube Slide Show
To: amsat-bb@xxxxx.xxx
Message-ID: <655240.87272.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
SwissCube is scheduled for launch at the end of April and pictures from a
recent presentation on the satellite are now available on the web, see
http://www.southgatearc.org/news/march2009/swisscube_slideshow.htm
73 Trevor M5AKA
Daily Amateur Radio RSS News: http://www.southgatearc.org/
Get Daily Amateur Radio News by Email
http://www.feedburner.com/fb/a/emailverifySubmit?feedId=2783644&loc=en_US
----
------------------------------
Message: 8
Date: Mon, 16 Mar 2009 15:08:33 -0700 (PDT)
From: andy thomas <andythomasmail@xxxxx.xx.xx>
Subject: [amsat-bb] Tranzit-B telemetry system on ISS
To: amsat <amsat-bb@xxxxx.xxx>
Message-ID: <456951.39042.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
I've just come across the following interesting references on space ref to
what seems to be a VHF telemetry channel (bio/medical monitoring?)
"...including VHF/voice & biomedical electrode belt and *telemetry hookups via
the BSS (later by the wireless in-suit Tranzit-B radio telemetry system) for
vital signs and equipment monitoring".
http://www.spaceref.com/news/viewsr.html?pid=30763
and:
" [The suited run requires wireless Tranzit-B suit radio telemetry on both
semisets (activated: 2:56am) and temporary deactivation of the Russian VHF
channel 1 (Very High Frequency, Russian: UKV1, for ultra-shortwave) to avoid
interference from extraneous radio stations to the Orlans while over Russian
ground stations (RGS, DO 3/4). All EVA preps were monitored by the ground via
audio, the reason for the early morning time of the training run. Tranzit-B
TM was turned off at ~3:10am EST.]"
http://www.hq.nasa.gov/osf/iss_reports/reports2008/12-19-2008.htm
My questions are: what is the TRANZIT-B TM system, how close is it to the 2m
channels, what is the TLM data modulation and breakdown?
73 de andy G0SFJ
------------------------------
Message: 9
Date: Mon, 16 Mar 2009 15:54:59 -0700 (PDT)
From: MM <ka1rrw@xxxxx.xxx>
Subject: [amsat-bb] Re: Tranzit-B telemetry system on ISS
To: amsat <amsat-bb@xxxxx.xxx>, andythomasmail@xxxxx.xx.xx
Message-ID: <711724.22958.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
The Russians have a few transmitters in the VHF band.
I am not at liberty to release the exact frequencies.
One of the commercial radios on ISS is a FM Repeater. The downlink is just
below the amateur radio 2-meter band and the uplink is in the aircraft band.
Once a month or so they leave the VHF-1 radio running constantly to test the
ground stations ability to access this system in case of emergency. If the
ISS ever tumbles, it will loose satellite lock and will have to rely on VHF
communications line-of-site links until stable flight is reestablished. The
Mir Space Station tumbled on several occasions.
Sometimes you can hear VHF-1 while ISS is passing over the USA. When the
repeater mode is active you can hear American aircraft signals being re-
transmitted over the ISS commercial repeater.
It seems that there is no interested in making the Russian ISS repeater input
channel a clear channel in the USA.
When VHF-1 was active on Mir, it would immediately de-sense the Kenwood TM-733
and the TM-V7A. To correct this problem I installed a custom built filter
from DCI to notch out the offending VHF-1 transmission. I have not been able
to confirm if ISS has the same issues.
73 Miles WF1F
www.marexmg.org
--- On Mon, 3/16/09, andy thomas <andythomasmail@xxxxx.xx.xx> wrote:
> From: andy thomas <andythomasmail@xxxxx.xx.xx>
> Subject: [amsat-bb] Tranzit-B telemetry system on ISS
> To: "amsat" <amsat-bb@xxxxx.xxx>
> Date: Monday, March 16, 2009, 6:08 PM
> I've just come across the following interesting
> references on space ref to what seems to be a VHF telemetry
> channel (bio/medical monitoring?)
>
> "...including VHF/voice & biomedical electrode
> belt and *telemetry hookups via the BSS (later by the
> wireless in-suit Tranzit-B radio telemetry system) for vital
> signs and equipment monitoring".
>
> http://www.spaceref.com/news/viewsr.html?pid=30763
>
> and:
>
> " [The suited run requires wireless Tranzit-B suit
> radio telemetry on both semisets (activated: 2:56am) and
> temporary deactivation of the Russian VHF channel 1 (Very
> High Frequency, Russian: UKV1, for ultra-shortwave) to avoid
> interference from extraneous radio stations to the Orlans
> while over Russian ground stations (RGS, DO 3/4). All EVA
> preps were monitored by the ground via audio, the reason for
> the early morning time of the training run. Tranzit-B TM
> was turned off at ~3:10am EST.]"
>
> http://www.hq.nasa.gov/osf/iss_reports/reports2008/12-19-2008.htm
>
> My questions are: what is the TRANZIT-B TM system, how
> close is it to the 2m channels, what is the TLM data
> modulation and breakdown?
>
> 73 de andy G0SFJ
>
>
>
>
>
> _______________________________________________
> 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: 10
Date: Mon, 16 Mar 2009 15:58:40 -0700 (PDT)
From: Michael Heim <kd0ar@xxxxxxxxx.xxx>
Subject: [amsat-bb] S band downlink - AO-51
To: AMSAT-BB@xxxxx.xxx
Message-ID: <586634.36443.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Worked VE3NPC on AO-51 V/s just now. We had the transponder totally to
ourselves, and had a nice little chat. I was on this morning around 7:30, by
myself. We have V/s all week. This is my favorite configuration, the signals
are a LOT stronger on 2401.2 then on 70cm.
What is the TPO and antenna on S band on AO-51?
Such good conditions, I hope to hear you on!!
Michael Heim
ARS KD0AR
------------------------------
Message: 11
Date: Mon, 16 Mar 2009 18:02:49 -0500 (CDT)
From: "Alan Sieg WB5RMG" <wb5rmg@xxxxxxx.xxx>
Subject: [amsat-bb] NASA's DTN & SDR
To: amsat-bb@xxxxx.xxx
Message-ID: <4176.192.168.121.31.1237244569.squirrel@xxx.xxx.xxx.xx>
Content-Type: text/plain;charset=iso-8859-1
Someone sent me a copy of this article last week, and I didn't get around
to posting it here for the AMSAT-BB readers. This concept started out
with a name "Delay Tolerant Networking" and was being designed to accomodate
the need for command queuing under long delay situations like Mars orbit.
Even Lunar presents more delay than a traditional tcp/ip architecture is
optimized for... Factors other than delay contribute to overal "Disruption"
so it made sense for the name to be more inclusive. Some of the folks
working on this concept are in my building, and I hope to be doing some
tinkering with this in my lab before too long.
At least they didn't have to change the acronym.
I'm sure Lowell won't mind if I repost this without the funky
web-formatting that tries to tag along sometimes...
==========================================================================
Here is the link to the original article :
http://gcn.com/articles/2009/03/09/nasa-software-radios.aspx
COMMUNICATIONS / NETWORKS
NASA plans improved ?Internet in space?
* By Sean Gallagher
* Mar 09, 2009
NASA?s Deep Space Network is on the way toward becoming a true Internet in
space, thanks to the agency?s research and investment in software-defined
radios (SDRs). Also, the agency is preparing an SDR test module for the
International Space Station that will be capable of connecting the station
with an uplink of 100 megabits per second.
Pat Elben, the chairman of NASA?s software defined radio architecture and
technology team (SAT) at NASA?s Space Communications and Navigation
directorate, told attendees at the IDGA?s Software Radio Summit that the
agency is setting up a new test platform. The platform, named the
Communication Navigation and Networking Reconfigurable Testbed (CoNNeCT) will
help NASA test waveforms based on the agency's Space Telecommunications Radio
System (STRS), NASA's own standard for space-rated software-defined radio
systems.
CoNNeCT will be added to the International Space Station in 2011, and
demonstrate communications between the space station and the Tracking and Data
Relay Satellite constellation that makes up the backbone of NASA?s network
with three radio systems -- the Electra radio that flew aboard MRO, the
General Dynamics Starlight radio, and the Orion radio -- the system being
designed for NASA's follow-on to the space shuttle.
NASA developed its own standard because of the demanding requirements of
space, where reprogramming a radio often has to be done remotely while the
radio is on a spacecraft traveling through the solar system.
That was the case, Elben said, when the Mars Reconnaissance Orbiter (MRO) was
launched. Technicians discovered the Electra radio aboard MRO, a
software-defined radio that was to act as the communications link to the two
Mars rovers on the surface, was getting interfered with by something else on
the spacecraft just before launch. NASA was able to launch the MRO and create
a software patch and upload it to the Electra radios aboard it while the
spacecraft was en route to Mars, he said.
Some observers have expressed concerns that suppliers might be reluctant to
write software to yet another SDR architecture ? the Defense Department?s
Joint Tactical Radio System uses the Software Communications Architecture,
which has been adopted by the Software Defined Radio Forum along with its own
SW Radio standard. Elben said NASA plans on buying more than 1,000 STRS-based
radios between now and 2025, but the price of these radios ? between $1
million and $5 million ? makes STRS radios a potentially $1 billion market for
radio developers.
Although NASA has deployed software-defined radios for years, starting with
the ?Blackjack? global positioning system receiver on spacecraft in 2000, STRS
will be part of the basis of an ambitious revamp of the agency?s Deep Space
Network. The re-engineering will be based on SDRs and on high-bandwidth
optical links, Elben said. It will also entail the use of software-defined
systems and a move to less-expensive arrays of dish antennas instead of the
old larger dishes. The new approaches are expected to make the network more
automated and less expensive.
In the 1960s when NASA first created what became its Deep Space Network,
?there was no grand vision,? Elben said. ?NASA?s goal for 2024 is a highly
integrated, IP-based disruption resistant network.?
Last November, NASA successfully tested Disruption Tolerant Networking (DTN),
an Internet Protocol-based network using store-and-forward technology to
ensure that packets of data would not be lost when being passed through the
Deep Space Network. The agency will begin testing DTN aboard the International
Space Station this summer.
====================================================================
Thanks /;^)
--
<- Licensed in 1976, WB5RMG = Alan Sieg * AMSAT#20554 ->
<- http://www.somenet.net * http://wb5rmg.somenet.net ->
<- http://www.linkedin.com/in/alansieg * My 'Day Job' ->
------------------------------
Message: 12
Date: Mon, 16 Mar 2009 16:03:14 -0700 (PDT)
From: MM <ka1rrw@xxxxx.xxx>
Subject: [amsat-bb] Re: Shuttle Launch visible 3/15/09
To: amsat-bb@xxxxx.xxxx Bobby Lacey <amsat@xxxxxxxxxxx.xxx>
Message-ID: <626464.33264.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Here are 4 of my Shuttle streak images over boston ma.
http://www.flickr.com/photos/36403622@xxxx
--- On Mon, 3/16/09, Bobby Lacey <amsat@xxxxxxxxxxx.xxx> wrote:
> From: Bobby Lacey <amsat@xxxxxxxxxxx.xxx>
> Subject: [amsat-bb] Re: Shuttle Launch visible 3/15/09
> To: amsat-bb@xxxxx.xxx
> Date: Monday, March 16, 2009, 4:29 PM
> I was fortunate enough to watch the launch from the NASA
> causeway
> again. The sunset lit plume was an amazing site. I posted a
> few photos
> at http://www.flickr.com/photos/rllacey
>
> 73 de Bobby KF4GTA
> http://www.nq4i.com
> _______________________________________________
> 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: 13
Date: Mon, 16 Mar 2009 19:23:38 -0400
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Tranzit-B telemetry system on ISS
To: "amsat" <amsat-bb@xxxxx.xxx>, <andythomasmail@xxxxx.xx.xx>
Message-ID: <FD4220EBDE1147A89D71C53C2A785632@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
> The Russians have a few transmitters in the VHF band.
> I am not at liberty to release the exact frequencies.
Sheesh. If anyone is curious, look about halfway down this page:
http://www.issfanclub.com/frequencies
73, Drew KO4MA
------------------------------
Message: 14
Date: Mon, 16 Mar 2009 16:51:52 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] Re: S band downlink - AO-51
To: amsat-bb@xxxxx.xxx
Message-ID:
<2e18ad3e0903161651m31b06d69w641e052c8ccc3f8c@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi Michael!
> Worked VE3NPC on AO-51 V/s just now. ?We had the transponder
> totally to ourselves, and had a nice little chat. ?I was on this morning
> around 7:30, by myself. ?We have V/s all week. ?This is my favorite
> configuration, the signals are a LOT stronger on 2401.2 then on 70cm.
>
> What is the TPO and antenna on S band on AO-51?
I forget what the TPO is, that is listed in WA4SXM's AO-51 book. Maybe
2W or 2.5W. Details on the antenna are also in that book, or you can look
at page 7 in the PDF at:
http://www.amsat.org/amsat-new/echo/OSCAR-E_Status_Report_5.pdf
to see the L/S antenna.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 15
Date: Mon, 16 Mar 2009 20:20:00 -0400
From: "Gould Smith" <gouldsmi@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: S band downlink - AO-51
To: "Michael Heim" <kd0ar@xxxxxxxxx.xxx>, <AMSAT-BB@xxxxx.xxx>
Message-ID: <CF604AF7D4CE4EE4866F69145A8E4289@xxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Michael and BB,
Lou McFadin showed me a photograph a year or so ago of the S-band output
measured before launch, and it showed 1.2W out.
The antenna is a 1.2 GHz antenna tuned to also operate on 2.4 GHz, about 2-3
inches tall.
There is quite a bit of path loss at 2.4 GHz, but I imagine you have a good
preamp very close to the antenna.
73,
Gould, WA4SXM
----- Original Message -----
From: "Michael Heim" <kd0ar@xxxxxxxxx.xxx>
To: <AMSAT-BB@xxxxx.xxx>
Sent: Monday, March 16, 2009 6:58 PM
Subject: [amsat-bb] S band downlink - AO-51
>
> Worked VE3NPC on AO-51 V/s just now. We had the transponder totally to
> ourselves, and had a nice little chat. I was on this morning around 7:30,
> by myself. We have V/s all week. This is my favorite configuration, the
> signals are a LOT stronger on 2401.2 then on 70cm.
>
> What is the TPO and antenna on S band on AO-51?
>
>
> Such good conditions, I hope to hear you on!!
>
> 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: 16
Date: Mon, 16 Mar 2009 18:27:04 -0600
From: "Nate Duehr" <nate@xxxxxxxx.xxx>
Subject: [amsat-bb] Re: Tranzit-B telemetry system on ISS
To: "'amsat'" <amsat-bb@xxxxx.xxx>
Message-ID: <007801c9a697$19227190$4b6754b0$@xxx>
Content-Type: text/plain; charset="us-ascii"
How are the "American aircraft signals" which are all AM, being rebroadcast
in any intelligible way by an FM receiver?
The only aircraft that MIGHT transmit with FM, are military aircraft. And
rarely in the clear or without frequency-hopping spread spectrum technology
involved. (And that's not really FM, so to speak -- nor copyable through
the repeater you're describing.)
I smell something wrong here with your information, or there's more to the
story.
Nate WY0X
-----Original Message-----
Sometimes you can hear VHF-1 while ISS is passing over the USA. When the
repeater mode is active you can hear American aircraft signals being
re-transmitted over the ISS commercial repeater.
------------------------------
Message: 17
Date: Mon, 16 Mar 2009 17:38:56 -0700
From: Bryan Green <bag@xxx.xxx>
Subject: [amsat-bb] Re: N3TL/portable tonight
To: AMSAT-BB <AMSAT-BB@xxxxx.xxx>
Message-ID: <C2874CA7-78FC-4486-8B07-216E3E417F3F@xxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
On Mar 16, 2009, at 12:33 PM, n3tl@xxxxxxxxx.xxx wrote:
> I plan to operate AO-51 this evening (March 16 local time, March 17
> UTC) from South Carolina.
>
> I should be in the footprint from around 00:15 UTC to 00:23 UTC
> (8:15 p.m. - 8:23 p.m., EDT) on 145.920 up/435.150 down.
Bah humbug. I heard you loud and clear, but I couldn't break through
the East Coast Curtain. Here's to next time -- your DX-peditioning has
inspired me. CN71 isn't that far away...
-- bag
KL7CN/6 * CM98fn * AMSAT #23202
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End of AMSAT-BB Digest, Vol 4, Issue 128
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