hello all. this is the video of Vo52 sat reception on a Genesis G59 SDR using a 10m to 2m transverter tentec 1210
http://www.youtube.com/watch?v=MAIh2bOs34I
73 de SW1JGW
Dimitrios Jimmy Pallis
From: [email protected] Subject: AMSAT-BB Digest, Vol 6, Issue 93 To: [email protected] Date: Fri, 11 Feb 2011 12:00:05 -0800
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Today's Topics:
- ARISSat Signal ? (Mani VU2WMY)
- Heard ARISSAT-1 on two passes (Andy MacAllister)
- ARISSat-1 copied (Greg D.)
- Re: ARISSat-1 copied ([email protected])
- audio excerpts of 03:11 UTC ARISSat-1 pass on ISS
([email protected]) 6. Re: ARISSat-1 - Dumb Question (Rocky Jones) 7. RE;....2401MHZ Beacon query (Charlie -K3VDB-)
Message: 1 Date: Fri, 11 Feb 2011 09:31:17 +0530 From: Mani VU2WMY [email protected] Subject: [amsat-bb] ARISSat Signal ? To: [email protected], AMSAT-INDIA [email protected] Message-ID: [email protected] Content-Type: text/plain; charset=UTF-8; DelSp="Yes"; format="flowed"
Just heard a CW signals on 145.919 during the 03:50 low angle pass (Max ele 4 deg). Could some one confirm, is it from ARISSat under test on board the ISS ?
73 de
Mani, VU2WMY Secretary & Station-In-Charge Upagrah Amateur Radio Club VU2URC ISRO Satellite Centre HAL Airport Road, Bangalore-560 017. Phone:(O)91-80-25082054/2598/2192 Mobile: 91-80-98803 41456 E-mail ID: [email protected] [email protected] [email protected]
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Message: 2 Date: Fri, 11 Feb 2011 00:03:43 -0600 From: "Andy MacAllister" [email protected] Subject: [amsat-bb] Heard ARISSAT-1 on two passes To: "'AMSAT BBS'" [email protected] Message-ID: 8DB9B3DF83F647FFADB4CD66B5FCC02B@w5acmathlon Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original
Allen N5AFV had just finished a talk on ARISSAT-1 for the Brazos Valley Amateur Radio Club here in SW Houston... Bruce KK5DO, Charlie K5ENG, and a few others headed outside to listen for the ARISSAT-1 tests from the ISS. We heard it on a 7-deg el pass using his TH-D72 HT. On the next pass, I was listening from home, but just wasn't quick enough to catch the SSTV signal in it's entirity. However, you can see what I did manage to capture with my TH-D7A and VC-H1 at 0450Z at http://www.w5acm.net/110211_004014.jpg
Looking forward to R-28 on Feb 16th!
73 de Andy W5ACM
Message: 3 Date: Fri, 11 Feb 2011 00:13:44 -0800 From: "Greg D." [email protected] Subject: [amsat-bb] ARISSat-1 copied To: [email protected] Message-ID: [email protected] Content-Type: text/plain; charset="iso-8859-1"
Nice pass just now, started 07:53z (about local midnight). Off for a few minutes, then I heard the voice transmission, then off, then SSTV. Full quieting with my 8 element beam and a preamp. The SSTV picture was not so great, as it was near the end of the pass, and I had disabled my Az tracking before the antenna would have needed to swing past 0-degrees. I usually get better results being not quite aimed right, than losing 60 seconds of tracking while it swings clear around.
How long will it be in this mode? I didn't get much chance to tune around the passband to see if anything else was going on.
Greg KO6TH
Message: 4 Date: Fri, 11 Feb 2011 04:36:39 EST From: [email protected] Subject: [amsat-bb] Re: ARISSat-1 copied To: [email protected], [email protected] Message-ID: [email protected] Content-Type: text/plain; charset="US-ASCII"
In a message dated 11/02/2011 08:27:41 GMT Standard Time, [email protected] writes:
How long will it be in this mode? I didn't get much chance to tune around the passband to see if anything else was going on.
Greg KO6TH
Hi
Nice to catch a little of the CW at 00.23UTC last night here in London.
I wonder if the battery will get a top up before the 16th. 200mA @28V for 8 hours = 161kJ and counting.
David
Message: 5 Date: Thu, 10 Feb 2011 23:24:10 -0500 From: [email protected] Subject: [amsat-bb] audio excerpts of 03:11 UTC ARISSat-1 pass on ISS To: [email protected] Message-ID: 9DA3CFFB2B4845C188DFA45A51AC204C@DHJ Content-Type: text/plain; charset="iso-8859-1"
Here is some excerpts from the 03:11 UTC ARISSat-1 on ISS pass over Orlando, FL. I deleted stretches of noise between the audio I heard as to make this short. First is a little of the voice telemetry, then the ID and message, finally a faint SSTV frame that starts just as it goes over the horizon. This was using a TH-D7AG with an Arrow antenna and no preamp.
Dave, AA4KN
Message: 6 Date: Thu, 10 Feb 2011 22:52:42 -0600 From: Rocky Jones [email protected] Subject: [amsat-bb] Re: ARISSat-1 - Dumb Question To: [email protected], [email protected] Cc: [email protected], Amsat, BB [email protected], [email protected] Message-ID: [email protected] Content-Type: text/plain; charset="iso-8859-1"
Hello All.. A basic rule of the "internets" is in the discussion of orbits when Hohmann transfers are brought up the easy discussion is over (grin)...but everyone below has the essential points. When a velocity vector modification is made in an orbit the "area " rule means that the changes to the orbit are increasingly felt as the antipodal or 180 degree point is approached. IN addition of course other factors act on the orbit and as Bob described it in the cares of ARISSAT the main one would be "drag" as the probe has a lot less mass then the space station...this will quickly remove the satellite from the orbital altitude of the station...although Bob is correct in a perfect world the satellite and ISS would meet again one orbit later. There is a great deal of difference in "prox ops" and long term orbit modifications.
This is not initiative. The closest thing to it is in basic pilot training teaching the notion of a "turn around a point". Here the "change" vector is wind and it takes a bit of instruction to recognize that any changes made "now" do not really manifest themselves until about 90 degrees later.
There are several "strange" things that celestial mechanics drive. It took sometime to recognize that when the shuttle and station dock, the center of gravity of both vehicles combine to move the CG well outside the combined stack. (think of how the shuttle VRS say how a Progress docks as well as the relative mass of the vehicles). This eventually drove changes in the docking and latching procedure.
Robert G. Oler WB5MZO Life Member AMSAT/ARRL and NARA and soon to be 5N something.
CC: [email protected]; [email protected]; [email protected]; [email protected]; [email protected] From: [email protected] Subject: Re: [amsat-bb] Re: ARISSat-1 - Dumb Question Date: Thu, 10 Feb 2011 17:51:12 -0700 To: [email protected]
This time I'll actually type something before hitting send;)
The two burn maneuver is essentially a Hohmann transfer maneuver. The point of the first burn becomes the new apogee or perigee (depending on the direction of the burn). The burn will raise or lower the antipodal point from where the burn occurred. At that point a second burn in the same direction will bring the point of the first burn to the new level.
But you all probably already knew that:)
If you want to play around with this try this:
http://orbit.medphys.ucl.ac.uk/home.php
Sent from my iPod Rick Tejera Editor, SACnews Saguaro Astronomy Club www.saguaroastro.org K7TEJ
On Feb 10, 2011, at 17:17, "Bob Bruninga" [email protected] wrote:
a retrograde maneuver will remove ARISSsat from the proximity of ISS very very quickly.
It is interesting that any such one-thrust (arm throw) maneuver will then intersect the ISS exactly one orbit later. In theory that is. But the difference in drag at that low altitude will usually be enough to have a safe miss distance on the next and subsequent orbits.
I think that is why most space maneuvers require two burns. One to start a new orbit (but it will still intersect the original orbit on every orbit. Then a second burn somewhere else in the orbit to get rid of that intersecting point?
Bob, WB4APR
> ... Clint. When ARISSAT is released it will stay in the "Plane" of
ISS
orbit...they will toss it retrograde meaning in the opposite direction
of
the velocity vector and with its slightly lower velocity the orbit will start to decrease...this is done so that very quickly the orbits will
stop
being "prox ops" reasonably fast.
If so, then I believe as the orbit altitude is reduced, the apparent velocity increases.....(??) which will cause ARISsat-1 to 'move ahead'
of the
ISS over a few hours
But didn't we say the velocity would be less than the ISS due to the
method
of deploying it against the velocity vector ?
Interesting puzzler, eh? From what I have read in the past, I think this
their logic.
What they are trying to do is to separate the orbits of the ISS and
ARISSat as quickly as possible, to avoid the potential for a collision. Consider the options:
- Throw it sideways to the ISS orbit. The result is that twice per
orbit the two spacecraft's paths will cross, side to side. Bad idea.
- Throw it ahead of the ISS (faster orbit speed). This will raise the
orbit, slightly, and also make it a bit elliptical (up and down). The higher orbit makes the satellite go behind the ISS, but the elliptical shape also means that the orbits will cross every orbit (but out of phase, so they won't be at the same place when they do). But, then as the ARISSat orbit decays, they will get closer and closer, potentially getting back to the same place. Not good, either.
- Throw it behind the ISS (slower orbit). As you note, this will lower
the orbit (and make it a bit elliptical), and initially the apogee of the orbit will intersect that of the ISS. Being in a lower orbit, ARISSat will move ahead of the ISS, and over time, as the ARISSat orbit decays, the two will diverge even farther. So, this is the safest.
At least, I think that's the logic. If not, pass me some of that tuna...
Greg KO6TH
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Message: 7 Date: Thu, 10 Feb 2011 14:09:47 -0500 From: Charlie -K3VDB- [email protected] Subject: [amsat-bb] RE;....2401MHZ Beacon query To: [email protected], [email protected] Cc: [email protected], [email protected], [email protected], [email protected], [email protected] Message-ID: [email protected] Content-Type: text/plain; charset="us-ascii"; format=flowed
Hello AMSAT;.......Regarding my earlier message copied below asking for reports of the usage of our 2401MHZ beacon.
We have received sufficient positive reports to continue to maintain this 24/7 beacon.
I would like to thank all that responded with your comments and hope to hear from you from time to time with signal and TLM reports.
Charlie K3VDB
----------------Quoted Message---------------------------------
Hello AMSAT;......I am trying to determine if the W3HMS beacon on 2401MHZ is being use by the Satellite community located in South Central PA. We have not received any reports for some time and will not continue to support it if not needed.
It Is located in FM19qv (S/E of York PA.).
For those who are not familiar with it, it has been on 24/7 for >3 years and located at 1000ft on a 130ft tower. Its output is 1W to a RHCP Lindenblad Ant. Its CW Message contains 5 Telemetering (TLM) channels and about 15 sec of solid carrier (then it repeat). A spread sheet TLM decoder is available on request. The beacon is useful for Receive system testing and propagation analyzing etc.
The 2401MHZ beacon is co-located with a 1296MHZ beacon and a 5760MHZ beacon.
More info is available at [email protected]
Please Let me know if any of these beacons are useful to you!!!
Charlie
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End of AMSAT-BB Digest, Vol 6, Issue 93