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CX2SA > SATDIG 08.09.12 09:03l 852 Lines 28143 Bytes #999 (0) @ WW
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Sent: 120908/0757Z @:CX2SA.SAL.URY.SA #:1133 [Salto] FBB7.00e $:AMSATBB7290
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: APRS back on 145.825 via ISS! (Vince Fiscus, KB7ADL)
2. Re: AO-10 and AO-16 (Alan P. Biddle)
3. Re: Fw: Digital Slow Scan in space (Graham Shirville)
4. Re: Fw: Digital Slow Scan in space (Simon HB9DRV)
5. APRS back on 145.825 via ISS! (Kevin Deane)
6. Re: APRS back on 145.825 via ISS! (Clayton Coleman)
7. Re: Digital Slow Scan in space (g0mrf@xxx.xxxx
8. Re: Fw: Digital Slow Scan in space and free food...
(Robert Bruninga)
9. for sale (Jerry Ehlers)
10. Re: AO-10 and AO-16 (Gary "Joe" Mayfield)
11. Deciphering Phase 3D Telemetry (Tony)
12. IO-26 as digital EMAIL relay? (Robert Bruninga)
13. Re: Deciphering Phase 3D Telemetry (Douglas Quagliana)
14. Re: IO-26 as digital EMAIL relay? (Douglas Quagliana)
15. Re: Digital Slow Scan in space (Trevor .)
----------------------------------------------------------------------
Message: 1
Date: Fri, 07 Sep 2012 14:37:17 -0600
From: "Vince Fiscus, KB7ADL" <vlfiscus@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: APRS back on 145.825 via ISS!
Message-ID: <5.2.1.1.2.20120907143541.00bf2248@xxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 12:53 PM 9/7/2012 -0400, bruninga@xxxx.xxx wrote:
>Just heard ISS back on 145.825.
>
>Two students went outside with a D7 HT and sent themselves email using
>APRS via ISS. Came back inside and were amazed to see the Email in their
>inbox already!
Thank God for QRM.
KB7ADL
------------------------------
Message: 2
Date: Fri, 7 Sep 2012 15:25:25 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-10 and AO-16
Message-ID: <4AE8C3F9DD2B43AA807B1F3C128D7017@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Reid,
Still up there, and will be for years.
Early on, after the propulsion incident, there WAS a reluctance to command
certain functions for fear of making things worse. I recall some
discussions at an AMSAT Symposium, perhaps imperfectly, on the subject. For
instance, the solar panels were not deployed. They were working adequately
in the stowed position. If only one deployed, then you would have had an
unbalanced spacecraft, which would have made attitude control difficult to
impossible. Also, the damage to the wires was unknown, and a short might be
induced.
Post final failure, there were some amazing tests run, including the use of
a radio telescope which could hear the internal local oscillators responding
to commands. The nature of the failure was well understood. I doubt anyone
would be worried about making things worse, now. There is just little
probability that it will pull an AO-10.
73s,
Alan
WA4SCA
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of w4upd
Sent: Friday, September 07, 2012 8:05 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO-10 and AO-16
On a side note. Do we know the 'physical' status of AO-40? Is it still
orbiting the earth? I don't believe I heard anything about it re-entering.
I do remember a conversation here on the BB some time ago about making
an attempt to command AO-40 again to see if it will respond. However,
the command team stated they were reluctant to do so in the event it
might cause further harm to an already bad situation.
My comment would be that if this were the case what can we lose since
we've gone this long without having its access. I think that if there is
even a 1 percent chance of commanding it, it should be attempted since
we've nothing to lose. Again, I may be in left field and missed
something here, but I feel if there is a chance, it should be given a
shot. If things go wrong, we're not any worse off then we have been
without it being operational so long. Then again the command team may
have already made an attempt and my comments are mute.
Reid, W4UPD
On 9/7/2012 6:42 AM, Mark L. Hammond wrote:
> Hi Joe,
>
> Actually, I checked on AO-16 last Saturday. I didn't even get the
transmitter to come on, let alone stay on. It was a low pass, and I hope to
check again in the next few weeks. If you'll remember, the problem with
keeping the satellite ON is temperature related. If it gets lots of sun
(little eclipse), it will be warm enough to remain on. Otherwise, it
won't...and the orbit is such that it doesn't get enough sun--and it
probably won't for another 10 years or so. But I check periodically.
>
> About every week or two Drew KO4MA and I try to turn AO-51 back on. My
latest try was last Saturday. Nothing heard.
>
> IO-26 is still up there, and still humming; it needs to be turned on from
time to time, so I do that. But we haven't figured out how to run it in
voice like we did with AO-16; it doesn't appear possible.
>
> Don't know about AO-10; I haven't listened for a while. And I don't know
if it is expected to come on without commanding (which I cannot do).
>
> 73,
>
> Mark N8MH
>
> At 10:28 PM 9/6/2012 -0500, Gary \"Joe\" Mayfield wrote:
>> Has anyone checked on AO-10 or AO-16 lately?
>>
>>
>>
>> 73,
>>
>> Joe kk0sd
>>
>> _______________________________________________
>> 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
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2012.0.2197 / Virus Database: 2437/5252 - Release Date: 09/06/12
>
>
_______________________________________________
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: Fri, 7 Sep 2012 21:38:31 +0100
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "Simon HB9DRV" <simon@xxxxxx.xx>, "'AMSAT BB'"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Fw: Digital Slow Scan in space
Message-ID: <3C2DEF16EBE6428E85EA36CD6F287F7C@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Simon,
Good question - "medium" was a deliberately vague term as it will also
depend on the camera and available data rates etc.
I was hoping we might be able to move on from analogue SSTV now.. we should
be able to achieve much better quality images,,,as you suggest the challenge
would be to do the digital encoding on board the spacecraft without using
lots of power but, as mentioned, - if they can do it on a tiny payload
hanging beneath a small helium balloon then it should be possible to do
something similar on a spacecraft even a 1U cubesat!
73
Graham
G3VZV
-----Original Message-----
From: Simon HB9DRV
Sent: Friday, September 07, 2012 2:13 PM
To: 'Graham Shirville' ; 'AMSAT BB'
Subject: [amsat-bb] Re: Fw: Digital Slow Scan in space
Graham,
What's 'medium resolution' ? Standard SSTV is not digital, it's analogous
with the (now no longer used) analogue TV. There is true digital SSTV used
on 80m and 40m and (I guess) other bands, from memory this is EasyPal; to
implement this in a satellite would be a long and tedious task.
Implementing one of the analogue SSTV modes would be easier - much easier -
but quality is nowhere as good.
Simon Brown, HB9DRV
http://sdr-radio.com
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Graham Shirville
We are looking for a practical system to use on a 1U, or perhaps 2U, cubesat
to take medium definition images and transmit them to the ground on VHF for
educational outreach purposes.
_______________________________________________
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: Fri, 7 Sep 2012 22:42:20 +0200
From: "Simon HB9DRV" <simon@xxxxxx.xx>
To: "'Graham Shirville'" <g.shirville@xxxxxxxxxx.xxx>, "'AMSAT BB'"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Fw: Digital Slow Scan in space
Message-ID: <01c001cd8d39$474fb230$d5ef1690$@xxxxxx.xx>
Content-Type: text/plain; charset="us-ascii"
Well you should be able to do it on small ARM processor, but you've always
got to take transmission time into account - those pesky satellites do tend
to move about quite a bit :)
There's also the format used by the NOAA weather satellites - simple and
works...
Simon Brown, HB9DRV
http://sdr-radio.com
-----Original Message-----
From: Graham Shirville [mailto:g.shirville@xxxxxxxxxx.xxxx
Good question - "medium" was a deliberately vague term as it will also
depend on the camera and available data rates etc.
I was hoping we might be able to move on from analogue SSTV now.. we should
be able to achieve much better quality images,,,as you suggest the challenge
would be to do the digital encoding on board the spacecraft without using
lots of power but, as mentioned, - if they can do it on a tiny payload
hanging beneath a small helium balloon then it should be possible to do
something similar on a spacecraft even a 1U cubesat!
------------------------------
Message: 5
Date: Fri, 7 Sep 2012 13:57:44 -0700
From: Kevin Deane <summit496@xxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] APRS back on 145.825 via ISS!
Message-ID: <COL002-W1019650F2DCBA29159C362A83AF0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Yup working great! http://ariss.net/index.cgi?absolute=1 Hope to make some
Digi contacts through all the beacons...
Kevin
KF7MYK
------------------------------
Message: 6
Date: Fri, 7 Sep 2012 17:01:15 -0500
From: Clayton Coleman <kayakfishtx@xxxxx.xxx>
To: Kevin Deane <summit496@xxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: APRS back on 145.825 via ISS!
Message-ID:
<CAPovOwdi+RjCJRR2ayBpwh6g7EWyJCZBRF670L9__XABfnhJng@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I was thinking the same thing, Kevin. With all this noise about it
being back up, I'm sure some people will boot up their PC's, turn the
radio on, and walk away. It's likely that some of these people gate
the traffic to the Internet but I'd wager greater than 50% of the
unattended stations beaconing every minute "HEY I'M ON THE ISS" don't
even have the courtesy to relay.
73
Clayton
W5PFG
On Fri, Sep 7, 2012 at 3:57 PM, Kevin Deane <summit496@xxxx.xxx> wrote:
> Yup working great! http://ariss.net/index.cgi?absolute=1 Hope to make some
Digi contacts through all the beacons...
>
> Kevin
> KF7MYK
>
>
> _______________________________________________
> 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: 7
Date: Fri, 7 Sep 2012 18:05:39 -0400 (EDT)
From: g0mrf@xxx.xxx
To: simon@xxxxxx.xxx g.shirville@xxxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Digital Slow Scan in space
Message-ID: <8CF5B5C0D0F9E4B-218C-2C234@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Hi both.
I believe the digital SSTV that is used on HF / VHF is in reality DRM,
which is a forward error corrected digital communications standard (?)
I suppose the real difficulty is implementing a method of reading an
image file and then encoding it for transmission in a broadcast type
format for general reception rather than one that requires handshaking
or acknowledgments from the groundstation.
An essential feature would be that whenever a 'packet' of data is
received, that data is displayed rather than waiting for the complete
image to be received error free.
I couldn't find much on DRM encoding but I think it was originally
intended for digital voice in a narrow bandwidth so it sounds suitable
for low power satellite use.
Thanks
David
-----Original Message-----
From: Simon HB9DRV <simon@xxxxxx.xx>
To: 'Graham Shirville' <g.shirville@xxxxxxxxxx.xxx>; 'AMSAT BB'
<amsat-bb@xxxxx.xxx>
Sent: Fri, 7 Sep 2012 21:51
Subject: [amsat-bb] Re: Fw: Digital Slow Scan in space
Well you should be able to do it on small ARM processor, but you've
always
got to take transmission time into account - those pesky satellites do
tend
to move about quite a bit :)
There's also the format used by the NOAA weather satellites - simple and
works...
Simon Brown, HB9DRV
http://sdr-radio.com
-----Original Message-----
From: Graham Shirville [mailto:g.shirville@xxxxxxxxxx.xxxx
Good question - "medium" was a deliberately vague term as it will also
depend on the camera and available data rates etc.
I was hoping we might be able to move on from analogue SSTV now.. we
should
be able to achieve much better quality images,,,as you suggest the
challenge
would be to do the digital encoding on board the spacecraft without
using
lots of power but, as mentioned, - if they can do it on a tiny payload
hanging beneath a small helium balloon then it should be possible to do
something similar on a spacecraft even a 1U cubesat!
_______________________________________________
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: 8
Date: Fri, 7 Sep 2012 18:20:45 -0400
From: Robert Bruninga <bruninga@xxxx.xxx>
To: Graham Shirville <g.shirville@xxxxxxxxxx.xxx>, Simon HB9DRV
<simon@xxxxxx.xx>, AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Fw: Digital Slow Scan in space and free
food...
Message-ID: <e81eaf7af7b28b1240bf40691d2b813a@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Argent Data makes a small SSTV camera about 1.5" cube for under $100. For
all practical purposes it is a modern replacement for the original Kenwood
VC-H1 SSTV handheld. He makes them for balloons etc.
We have one on a model satellite hanging out in our lobby and anyone can
trigger it with any FRS radio with the right channel and tone, and then
they can also receive and display the picture on any laptop with SSTV
software on it by just letting the laptop's mic hear the FRS radio
speaker.
The intent of this "spysat" in the lobby was so we could see when someone
was having a reception out there and there might be free food.
Bob, WB4APR
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Graham Shirville
Sent: Friday, September 07, 2012 4:39 PM
To: Simon HB9DRV; 'AMSAT BB'
Subject: [amsat-bb] Re: Fw: Digital Slow Scan in space
Hi Simon,
Good question - "medium" was a deliberately vague term as it will also
depend on the camera and available data rates etc.
I was hoping we might be able to move on from analogue SSTV now.. we
should
be able to achieve much better quality images,,,as you suggest the
challenge
would be to do the digital encoding on board the spacecraft without using
lots of power but, as mentioned, - if they can do it on a tiny payload
hanging beneath a small helium balloon then it should be possible to do
something similar on a spacecraft even a 1U cubesat!
73
Graham
G3VZV
-----Original Message-----
From: Simon HB9DRV
Sent: Friday, September 07, 2012 2:13 PM
To: 'Graham Shirville' ; 'AMSAT BB'
Subject: [amsat-bb] Re: Fw: Digital Slow Scan in space
Graham,
What's 'medium resolution' ? Standard SSTV is not digital, it's analogous
with the (now no longer used) analogue TV. There is true digital SSTV used
on 80m and 40m and (I guess) other bands, from memory this is EasyPal; to
implement this in a satellite would be a long and tedious task.
Implementing one of the analogue SSTV modes would be easier - much easier
-
but quality is nowhere as good.
Simon Brown, HB9DRV
http://sdr-radio.com
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Graham Shirville
We are looking for a practical system to use on a 1U, or perhaps 2U,
cubesat
to take medium definition images and transmit them to the ground on VHF
for
educational outreach purposes.
_______________________________________________
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: 9
Date: Fri, 7 Sep 2012 19:06:23 -0500
From: Jerry Ehlers <w0sat2@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] for sale
Message-ID:
<CAKcwWq-MMwA9Z3CyikGYAzQfjvS=Dirh09D95h0B=ynJci_DYA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Hi: i have some transverters for sale.
1- Spectrum International Model MMV 1296
in the box with paper works
asking $125.00 or offers
1-SSB linear power amplifier model 2310
500to 700 MV output 10 watts
This is in the box too.asking $150.00
or offer
Will ship in lower 48 states only.
Thank you
Jerry w0sat
w0sat2@xxxxx.xxx
------------------------------
Message: 10
Date: Fri, 7 Sep 2012 22:32:42 -0500
From: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
To: "'AMSAT-BB'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-10 and AO-16
Message-ID: <BAY169-DS169581D375774FC992CE408AAE0@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Does anyone even have KEPS for AO-10?
73,
Joe kk0sd
-----Original Message-----
From: Mark L. Hammond [mailto:marklhammond@xxxxx.xxxx
Sent: Friday, September 07, 2012 5:43 AM
To: Gary "Joe" Mayfield; 'AMSAT-BB'
Subject: Re: [amsat-bb] AO-10 and AO-16
Hi Joe,
Actually, I checked on AO-16 last Saturday. I didn't even get the
transmitter to come on, let alone stay on. It was a low pass, and I hope to
check again in the next few weeks. If you'll remember, the problem with
keeping the satellite ON is temperature related. If it gets lots of sun
(little eclipse), it will be warm enough to remain on. Otherwise, it
won't...and the orbit is such that it doesn't get enough sun--and it
probably won't for another 10 years or so. But I check periodically.
About every week or two Drew KO4MA and I try to turn AO-51 back on. My
latest try was last Saturday. Nothing heard.
IO-26 is still up there, and still humming; it needs to be turned on from
time to time, so I do that. But we haven't figured out how to run it in
voice like we did with AO-16; it doesn't appear possible.
Don't know about AO-10; I haven't listened for a while. And I don't know if
it is expected to come on without commanding (which I cannot do).
73,
Mark N8MH
At 10:28 PM 9/6/2012 -0500, Gary \"Joe\" Mayfield wrote:
>Has anyone checked on AO-10 or AO-16 lately?
>
>
>
>73,
>
>Joe kk0sd
>
>_______________________________________________
>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: 11
Date: Sat, 08 Sep 2012 00:28:41 -0400
From: Tony <dxdx@xxxxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Deciphering Phase 3D Telemetry
Message-ID: <504AC979.9040009@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
All:
I found a recording I had made of OSCAR-40's beacon on an old hard
drive. I decoded the telemetry with AO40 RCV and found that it dates
back to November 17, 2000. The status window shows that AO-40 was on
it's third orbit at 15:11 UTC.
I'd like to know the position of satellite when the recording was made
and was wondering where I can find an accurate set of old Keplerian
elements?
Thanks,
Tony -K2MO
------------------------------
Message: 12
Date: Sat, 8 Sep 2012 01:11:51 -0400
From: Robert Bruninga <bruninga@xxxx.xxx>
To: Gary Joe Mayfield <gary_mayfield@xxxxxxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] IO-26 as digital EMAIL relay?
Message-ID:
<CALdCfN+A9=wUy7xsQB2qhB1Wa8CBWwJTFRTXwSENs7wsqjfCpw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
> IO-26 is still up there, and still humming;
> But we haven't figured out how to run it in
> voice like we did with AO-16;
Woha! But if it is a pacsat, can't it act as a digipeater if you just set
the DIGI bit to on? Then people can use it for real-time digital QSO's.
In the old days, it required everyone to get a $300 modem and use an SSB
rig on the downlink. But the Uplink is FM. SO anyone can transmit. And
these days, somone I am sure has already written the sound-card generate
the manchester uplink!
Then the satgates with the SSB receivers could capture all the downlink
traffic.
Or am I forgetting something?
(I know, I'm an APRS hammer and everything kinda looks like an APRS
nail...) But you dont have to call it APRS, just call it an emergency or
EMAIL link providing worldwide coverage for ham travelers needing a way to
get a message out... The global internet linked ground station and Email
engine already exists, Just send the email. If an IGate hears it anywhere
on the planet, then the Email is as good as delivered.
Bob, WB4APR
------------------------------
Message: 13
Date: Sat, 8 Sep 2012 01:40:23 -0400 (EDT)
From: Douglas Quagliana <dquagliana@xxx.xxx>
To: dxdx@xxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Deciphering Phase 3D Telemetry
Message-ID: <8CF5B9B92D5CAAA-1140-2F013@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Hi Tony,
All of the AO-40 telemetry is archived on the AMSAT website. You can
start at
http://www.amsat.org/amsat/ftp/telemetry/ao40/
For November 17 at 15:11 UTC you probably want the file
http://www.amsat.org/amsat/ftp/telemetry/ao40/2000/11/ao40_2000-11-17_00003.zi
p
for the corresponding telemetry from that day.
For the satellite's position, you can use the then-current TLEs from
earlier that day
which are in the file
http://www.amsat.org/amsat/ftp/telemetry/ao40/2000/11/ao40_2000-11-17_00002.zi
p
Almost every telemetry zip file contains a .TLE file with the NORAD TLE
elements
that correspond to that telemetry. For example, the file
ao40_2000-11-17_00002.zip
contains AO40_NORAD_SET_3.TLE which contains the then-current TLEs.
Those TLEs were only a few hours old when your recording was made. If
you
load those into a prediction program you can get the satellite's
position.
If your telemetry data from your recording is not already in the
archives, then
I'm sure we could get it added as a late submission. Let us all know
if your data
is unique! If you're not sure, send me what you copied or send me the
recording.
73 and I hope all of this helps,
Douglas KA2UPW/5
-----Original Message-----
From: Tony <dxdx@xxxxxxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Fri, Sep 7, 2012 11:41 pm
Subject: [amsat-bb] Deciphering Phase 3D Telemetry
All:
I found a recording I had made of OSCAR-40's beacon on an old hard
drive. I decoded the telemetry with AO40 RCV and found that it dates
back to November 17, 2000. The status window shows that AO-40 was on
it's third orbit at 15:11 UTC.
I'd like to know the position of satellite when the recording was made
and was wondering where I can find an accurate set of old Keplerian
elements?
Thanks,
Tony -K2MO
_______________________________________________
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: 14
Date: Sat, 8 Sep 2012 01:55:44 -0400 (EDT)
From: Douglas Quagliana <dquagliana@xxx.xxx>
To: bruninga@xxxx.xxxx gary_mayfield@xxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: IO-26 as digital EMAIL relay?
Message-ID: <8CF5B9DB8955FBD-1140-2F03A@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Bob wrote:
>In the old days, it required everyone to get a $300 modem and use an
SSB
>rig on the downlink. But the Uplink is FM. SO anyone can transmit.
And
>these days, somone I am sure has already written the sound-card
generate
>the manchester uplink!
Hi Bob,
I wrote that program to generate the Manchester uplink on a soundcard
about ten years ago. The program is called UPW for "Uplink to Pacsats
for Windows" and it's at
http://www.quagliana.com/upw/index.html
if anyone is still interested in it. UPW will generate the proper 1200
baud
AX.25 APRS packet with NRZI and Manchester encoding suitable for
feeding to the microphone of an FM transmitter. UPW is also mentioned
on your APRS ASTARS page. :-)
Bob continues:
>But if it is a pacsat, can't it act as a digipeater if you just set
the DIGI bit to on?
I think there's more to digipeating than just setting the digi bit. I
believe
IO-26 is still in MBL mode or something similar. I am pretty sure the
satellite is not running the full PACSAT BBS software which was needed
to digipeat AX25 packets, but I'll defer to Mark, N8MH, on the
specifics of
the current status of IO-26.
73,
Douglas KA2UPW/5
------------------------------
Message: 15
Date: Sat, 8 Sep 2012 08:54:59 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: simon@xxxxxx.xxx g.shirville@xxxxxxxxxx.xxxx amsat-bb@xxxxx.xxxx
g0mrf@xxx.xxx
Subject: [amsat-bb] Re: Digital Slow Scan in space
Message-ID:
<1347090899.79270.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
--- On Fri, 7/9/12, g0mrf@xxx.xxx <g0mrf@xxx.xxx> wrote:
> An essential feature would be that whenever a 'packet' of
> data is received, that data is displayed rather than waiting
> for the complete image to be received error free.
> I couldn't find much on DRM encoding but I think it was
> originally intended for digital voice in a narrow bandwidth
> so it sounds suitable for low power satellite use.
WinDRM (and DRMDV/FDMDV) were written by Cesco Lanza HB9TLK some info at
http://n1su.com/windrm/download.html
To achieve a reasonable data rate it's usually run at 64QAM (with full SSB
bandwidth). 64 QAM is less robust and requires a higher S/N.
I've no idea what the practical effects of a high Doppler shift would be,
although a computerized station with frequent Doppler correction should
track it okay.
Is the data rate on High Altitude Balloons about 300 bps ? I've never
received any images from them but if 300 bps is correct then the images are
either low res or take a long time to send ?
Analog SSTV is still going strong some 6 years after the introduction of
Digital SSTV perhaps indicating that existing Digital SSTV approaches do not
yet match the performance/robustness/ease of use of analog for HF working.
73 Trevor M5AKA
------------------------------
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End of AMSAT-BB Digest, Vol 7, Issue 290
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