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CX2SA > SATDIG 17.10.08 13:53l 618 Lines 19427 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V3 529
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Sent: 081017/1151Z @:CX2SA.LAV.URY.SA #:41351 [Minas] FBB7.00e $:41351_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Another opportunity for cross-satellite (n3tl(AT)bellsouth.net)
2. Congratulations Bob W7LRD! (Michael Tondee)
3. Still no joy with ISS....Dang Windoze update! (Michael Tondee)
4. Re: Still no joy with ISS....Dang Windoze update! (Alan P. Biddle)
5. Whats up with all the black pix? (Curt Nixon)
6. Re: Whats up with all the black pix?
(Ransom, Kenneth G. (JSC-OC)[BAR])
7. ISS SSTV no picture (Steve)
8. Re: ISS SSTV no picture (Alan P. Biddle)
9. Re: ISS SSTV no picture (Andrew Glasbrenner)
10. Re: Whats up with all the black pix? (Will Marchant)
11. SSTV over PY (Fabio Teixeira Magalhaes)
12. DO-64/Delfi-c3 telemetry (David Giles)
13. WB9L cross-satellite again (n3tl(AT)bellsouth.net)
14. Re: SSTV Algorithms? (Howard Long)
15. ISS recording Oct 16th 1338UTC (Ben Jackson)
16. Re: SSTV Algorithms? (Joe Fitzgerald)
17. Re: DO-64/Delfi-c3 telemetry (Wouter Jan Ubbels)
18. Robotic satellite tracking - CJU antenna (Pedro A. Perez)
19. Re: SSTV Algorithms? (Gordon JC Pearce MM3YEQ)
----------------------------------------------------------------------
Message: 1
Date: Thu, 16 Oct 2008 19:22:20 +0000
From: n3tl(AT)bellsouth.net
Subject: [amsat-bb] Another opportunity for cross-satellite
To: AMSAT-BB(AT)amsat.org
Message-ID:
<101620081922.13355.48F7946B000C9BB60000342B22243323629B0A02D2089B9A019C
04040A0DBF049BCC02(AT)att.net>
Content-Type: text/plain
Hey Everyone,
>From 22:48 UTC to 22:54 UTC later today (16 October), AO-16 and AO-51 will be
"up together" again. AO-51, during that period, will cover much of the eastern
U.S. and Canada, according to Orbitron. AO-16 will cover all of the western
U.S. during that same period.
Stations in the Great Lakes and Upper Midwest, please note - it appears as
though Alaska stations may hear folks working the 145.920 uplink on AO-51 if
they're working AO-16 after both kick me out of their respective footprints -
in the 22:55-56 UTC area.
I am going to work AO-16 that pass. That is, I will be transmitting 5 wats
from my HT into an omni antenna at 145.920, and tracking AO-16 for receive
using my Elk log periodic, handheld, at an FT-817ND to receive on UHF
sideband.
AA1PL banged into AO-16 from Rhode Island this morning, mobile. Anyone running
an omni antenna could have their signals reach both satellites, and those
stations pointing beams to reach AO-51 to the northeast have a chance to reach
AO-16 from the back side. That's what happened during both of the cross-
satellite contacts I've made so far, with WB9L and WA4NVM.
I find passes like these to be great opportunities for a very unique kind of
contact, so I'm going to see how things go tonight beginning at 22:48 UTC.
73 to all,
Tim - N3TL
AMSAT Member No. 36820
Athens, Ga. - EM84ha
------------------------------
Message: 2
Date: Thu, 16 Oct 2008 15:28:09 -0400
From: "Michael Tondee" <mat_62(AT)netcommander.com>
Subject: [amsat-bb] Congratulations Bob W7LRD!
To: <amsat-bb(AT)amsat.org>
Message-ID: <15AFC014643E402D93F94AC65F65F4B6(AT)w4hij1>
Content-Type: text/plain; charset="iso-8859-1"
Just pulled my November QST out of the mailbox and discovered that our very
own W7LRD won the photo contest with a beautiful picture of his satellite
array in the snow!
Nice going Bob!
73,
Michael, W4HIJ
------------------------------
Message: 3
Date: Thu, 16 Oct 2008 15:31:50 -0400
From: "Michael Tondee" <mat_62(AT)netcommander.com>
Subject: [amsat-bb] Still no joy with ISS....Dang Windoze update!
To: <amsat-bb(AT)amsat.org>
Message-ID: <F627739065574C699A83CBA550EAC5EC(AT)w4hij1>
Content-Type: text/plain; charset="iso-8859-1"
Came home today after leaving the rig and the PC running all of last night and
today to find that Windoze had downloaded an update and restarted my computer
at some point. I forgot to turn on autosave on CPIX and completely forgot
about automatic updates being on so I got nothing!
Oh, well back to the drawing board.
Michael, W4HIJ
------------------------------
Message: 4
Date: Thu, 16 Oct 2008 15:08:41 -0500
From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
Subject: [amsat-bb] Re: Still no joy with ISS....Dang Windoze update!
To: <amsat-bb(AT)amsat.org>
Message-ID: <B9B7C54904B0408585E6D704ACA77EC9(AT)WA4SCA>
Content-Type: text/plain; charset="us-ascii"
Michael,
I hate it when that happens. I have update set to only notify me. Less
ulcers that way. ;) Still getting SSTV downlinks, but only a purple
background with the NA1SS call at the bottom.
Alan
WA4SCA
------------------------------
Message: 5
Date: Thu, 16 Oct 2008 16:12:00 -0400
From: Curt Nixon <cptcurt(AT)flash.net>
Subject: [amsat-bb] Whats up with all the black pix?
To: amsat-bb(AT)amsat.org
Message-ID: <48F7A010.6040403(AT)flash.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Two passes in a row and several perfectly decoded pix all black ex the
call . Is the lens cap on?? Just kidding!
KU8L
Curt
------------------------------
Message: 6
Date: Thu, 16 Oct 2008 15:15:00 -0500
From: "Ransom, Kenneth G. (JSC-OC)[BAR]" <kenneth.g.ransom(AT)nasa.gov>
Subject: [amsat-bb] Re: Whats up with all the black pix?
To: "Curt Nixon" <cptcurt(AT)flash.net>, <amsat-bb(AT)amsat.org>
Message-ID:
<A2862DA1C49F4145AF6C2A4528294035021F4162(AT)NDJSEVS21A.ndc.nasa.gov>
Content-Type: text/plain; charset="US-ASCII"
The batteries in the VC-H1 need replacement.
Kenneth - N5VHO
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of Curt Nixon
Sent: Thursday, October 16, 2008 3:12 PM
To: amsat-bb(AT)amsat.org
Subject: [amsat-bb] Whats up with all the black pix?
Two passes in a row and several perfectly decoded pix all black ex the
call . Is the lens cap on?? Just kidding!
KU8L
Curt
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. 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: Thu, 16 Oct 2008 20:19:58 -0000
From: "Steve" <ai7w(AT)arrl.net>
Subject: [amsat-bb] ISS SSTV no picture
To: <amsat-bb(AT)amsat.org>
Message-ID: <0B266F448D1A46DBB2BE2938AE861FA6(AT)AI7WDesk>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
The first picture copied during the 18:15 pass over the west coast (orbit
#56766) was a very nice view out the window, however the second one and both
of the two pictures copied during the 19:50 pass (orbit #56767) were blank
(dark blue screen, no image).
Steve ... AI7W
------------------------------
Message: 8
Date: Thu, 16 Oct 2008 15:26:38 -0500
From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
Subject: [amsat-bb] Re: ISS SSTV no picture
To: <amsat-bb(AT)amsat.org>
Message-ID: <0D9487A0D8DE42C09641AD4D9E0D3F05(AT)WA4SCA>
Content-Type: text/plain; charset="us-ascii"
Batteries are running low. Guess they have to wait until they swing past a
Radio Shack.
Alan
WA4SCA
------------------------------
Message: 9
Date: Thu, 16 Oct 2008 16:33:37 -0400
From: "Andrew Glasbrenner" <glasbrenner(AT)mindspring.com>
Subject: [amsat-bb] Re: ISS SSTV no picture
To: <APBIDDLE(AT)mailaps.org>, <amsat-bb(AT)amsat.org>
Message-ID: <70F5201C8BE9427A8B6B61153071A284(AT)Andrewlaptop>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I hope Richard remembered his Battery Club card...
73, Drew
----- Original Message -----
From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
To: <amsat-bb(AT)amsat.org>
Sent: Thursday, October 16, 2008 4:26 PM
Subject: [amsat-bb] Re: ISS SSTV no picture
> Batteries are running low. Guess they have to wait until they swing past
> a
> Radio Shack.
>
> Alan
> WA4SCA
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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: Thu, 16 Oct 2008 16:53:52 -0400
From: Will Marchant <kc6rol(AT)amsat.org>
Subject: [amsat-bb] Re: Whats up with all the black pix?
To: "Ransom, Kenneth G. (JSC-OC)[BAR]" <kenneth.g.ransom(AT)nasa.gov>
Cc: amsat-bb(AT)amsat.org
Message-ID: <48F7A9E0.2080404(AT)amsat.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
It is the end of the crew day. Richard may remember to change the
batteries. We've asked for him to be reminded during the crew briefing
in the morning. I expect you'll be able to enjoy packet tonight while
the crew is sleeping...
73,
Will
Ransom, Kenneth G. (JSC-OC)[BAR] wrote:
> The batteries in the VC-H1 need replacement.
>
>
> Kenneth - N5VHO
>
> -----Original Message-----
> From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org]
On
> Behalf Of Curt Nixon
> Sent: Thursday, October 16, 2008 3:12 PM
> To: amsat-bb(AT)amsat.org
> Subject: [amsat-bb] Whats up with all the black pix?
>
> Two passes in a row and several perfectly decoded pix all black ex the
> call . Is the lens cap on?? Just kidding!
>
> KU8L
>
> Curt
--
Will Marchant, NAR 13356, Tripoli 10125 L3, AMA 800142, FBIS
kc6rol(AT)amsat.org http://www.spaceflightsoftware.com/will/
------------------------------
Message: 11
Date: Thu, 16 Oct 2008 17:59:20 -0300
From: Fabio Teixeira Magalhaes <ftmagalhaes(AT)terra.com.br>
Subject: [amsat-bb] SSTV over PY
To: AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <48F7AB28.1020902(AT)terra.com.br>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Finally I copied 2 pictures (same, blue with call letters in the end -
Robot 36) from ISS. Orbit nr 56.768 AOS 20:21 LOS 20:26 max elevation
3,3?......
Frequency was 145.825 not 145.800 (?). Xcvr FT847, Ant 2 x 6 ele OWA.
73 es DX
Fabio - PY4AJ
Amsat 19748
------------------------------
Message: 12
Date: Fri, 17 Oct 2008 09:27:24 +1030
From: David Giles <vk5dg(AT)aapt.net.au>
Subject: [amsat-bb] DO-64/Delfi-c3 telemetry
To: "Amsat-Bb(AT)Amsat. Org" <amsat-bb(AT)amsat.org>
Message-ID: <48F7C6D4.5070608(AT)aapt.net.au>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello All,
Just decoded my second set of telemetry from DO-64. So far I have heard
the 145.870 beacon every pass. Unlike during the first 3 months when it
was heard 1 pass in 10.
A question for the designers - are the two beacons separate transmitters
or just separate feeds to the one transmitter? The 145.870 is far more
reliable.
73 de David VK5DG
------------------------------
Message: 13
Date: Thu, 16 Oct 2008 23:15:33 +0000
From: n3tl(AT)bellsouth.net
Subject: [amsat-bb] WB9L cross-satellite again
To: AMSAT-BB(AT)amsat.org
Message-ID:
<101620082315.5020.48F7CB15000296BF0000139C22243429029B0A02D2089B9A019C0
4040A0DBF049BCC02(AT)att.net>
Content-Type: text/plain
Hey folks,
Mike, WB9L, and I worked cross-satellite at 22:50 UTC. Mike was on AO-51 to
the northeast, while I was working AO-16 to the southwest. I heard some other
stations that I know were working AO-51, but didn't get any other contacts.
Both satellites were low elevation to me here in north Georgia.
73,
Tim - N3TL
AMSAT Member No. 36820
Athens, Ga. - EM84ha
------------------------------
Message: 14
Date: Fri, 17 Oct 2008 00:30:44 +0100
From: "Howard Long" <howard(AT)howardlong.com>
Subject: [amsat-bb] Re: SSTV Algorithms?
To: "'laura halliday'" <marsgal42(AT)hotmail.com>, <amsat-bb(AT)amsat.org>
Message-ID: <6F73F4814DD0480798C341D12A461844(AT)LAPTOP9>
Content-Type: text/plain; charset="us-ascii"
Hi Laura
> All the usual references...
Which are?
The only way I've been able to create a number of formats is from
copyrighted texts. Do you know of detailed texts that are public domain? If
so let's have 'em!
73, Howard G6LVB
------------------------------
Message: 15
Date: Thu, 16 Oct 2008 22:16:51 -0400
From: Ben Jackson <bbj(AT)innismir.net>
Subject: [amsat-bb] ISS recording Oct 16th 1338UTC
To: AMSAT-BB(AT)amsat.org
Message-ID: <48F7F593.9050708(AT)innismir.net>
Content-Type: text/plain; charset=ISO-8859-1
Hey everyone, I recorded the 1338UTC pass over the Eastern US this
morning. Copied a nice SSTV picture and then Garriott flipped over voice
mode and spoke to VE1SKY(?) and KG7HF.
I've posted the SSTV pictures that I grabbed on various passes today and
the recording of the voice pass (Garriott starts talking about 5
minutes in) at http://www.innismir.net/article/49
~Ben
--
Ben Jackson - N1WBV - New Bedford, MA
bbj <at> innismir.net - http://www.innismir.net/
------------------------------
Message: 16
Date: Fri, 17 Oct 2008 03:02:25 -0400
From: Joe Fitzgerald <jfitzgerald(AT)alum.wpi.edu>
Subject: [amsat-bb] Re: SSTV Algorithms?
To: Curt Nixon <cptcurt(AT)flash.net>
Cc: amsat-bb(AT)amsat.org
Message-ID: <48F83881.1030108(AT)alum.wpi.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Curt Nixon wrote:
> I expect that the faster the soundcard samples, the better?
>
>
It's counterintuitive, but through the magic of sampling theory, once
you sample at twice the maximum frequency of the signal you are
interested in you know _everything_ about it! As a practical matter,
most ham gear audio rolls off sharply above 3 kHz (and SSTV is lower
than that) , so sampling at a measly 8 or 11.025kHz rate is plenty.
Howard Long wrote:
> Do you know of detailed texts that are public domain? If
> so let's have 'em!
>
>
And it's not public domain, but it is available as free software:
check out QSSTV for source code.
If you are interested in sampling theory, check out
http://www.dspguide.com/ch3/2.htm
-Joe KM1P
------------------------------
Message: 17
Date: Fri, 17 Oct 2008 09:28:47 +0200
From: "Wouter Jan Ubbels" <wjubbels(AT)gmail.com>
Subject: [amsat-bb] Re: DO-64/Delfi-c3 telemetry
To: "Amsat-Bb(AT)Amsat. Org" <amsat-bb(AT)amsat.org>
Message-ID:
<af4c9b1b0810170028u7d44b812h6fad7e6c62489b4b(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hi David,
yes, we have received your telemetry, thanks a lot for that!
the 145.870 and 145.930MHz are separate transmitters (which are only
combined just before the antennas), they are connected to the same
databus from the On Board Computer.
The drop out issue is not an issue with one of the transmitters
itself, but is related to the databus mentioned above, and it occurs
when large volumes of data are transferred. (And it is not dependent
on which transmitter is on).
Delfi-C3 is currently in basic mode, in which the datavolume no the
bus is relatively low since no payload data is gathered from the
payloads, in fact, the payloads are switched off, causing the dropout
issue not to occur (and it also does not occur in transponder mode).
This is why the downlink is still on when the satellite is over your
qth down under hi:)
73 on behalf of the Delfi-C3 / DO-64 team,
Wouter Jan Ubbels PE4WJ
On Fri, Oct 17, 2008 at 12:57 AM, David Giles <vk5dg(AT)aapt.net.au> wrote:
> Hello All,
>
> Just decoded my second set of telemetry from DO-64. So far I have heard
> the 145.870 beacon every pass. Unlike during the first 3 months when it
> was heard 1 pass in 10.
>
> A question for the designers - are the two beacons separate transmitters
> or just separate feeds to the one transmitter? The 145.870 is far more
> reliable.
>
> 73 de David VK5DG
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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: 18
Date: Fri, 17 Oct 2008 09:56:58 +0200
From: "Pedro A. Perez" <eb4dka(AT)teleline.es>
Subject: [amsat-bb] Robotic satellite tracking - CJU antenna
To: <amsat-bb(AT)amsat.org>
Message-ID: <001401c9302d$eee69440$de00a8c0(AT)pegasus>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi all, this is a very nice job with the little CJU antenna working the
AO-51 from our friend Jesus XE1AZJ:
http://www.youtube.com/watch?v=aWRZoZMjELA
Best 73,
Pedro EB4DKA
http://eb4dka.laserenadigital.com
------------------------------
Message: 19
Date: Fri, 17 Oct 2008 09:15:58 +0100
From: Gordon JC Pearce MM3YEQ <gordonjcp(AT)gjcp.net>
Subject: [amsat-bb] Re: SSTV Algorithms?
To: amsat-bb(AT)amsat.org
Message-ID: <48F849BE.7030104(AT)gjcp.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Joe Fitzgerald wrote:
> Curt Nixon wrote:
>> I expect that the faster the soundcard samples, the better?
>>
>>
> It's counterintuitive, but through the magic of sampling theory, once
> you sample at twice the maximum frequency of the signal you are
> interested in you know _everything_ about it! As a practical matter,
> most ham gear audio rolls off sharply above 3 kHz (and SSTV is lower
> than that) , so sampling at a measly 8 or 11.025kHz rate is plenty.
Hmm. That's not quite true. Consider a signal at 4kHz, being sampled
at 8kHz. What you'd see is a triangle wave, if you were sampling at the
peaks of the incoming signal (if you were sampling at the crossover
points, you'd see no signal at all!). How do you tell what the waveform
of the signal originally was? You can't...
If you sample your 4kHz signal at 16kHz, you've got four points across
each cycle, so at least you can start to get an approximation. If the
input signal was a sinewave you might see a sample at a crossing point,
then a sample at a peak, then a sample at the next crossing point, then
a sample at the next peak. You'd get a roughly sinewave-y signal, if
you squint a bit.
When I'm recording digital signals or SSTV I use 44.1kHz 16-bit mono
.wav files. Disk is cheap, and the ISS doesn't fly over that often...
> Howard Long wrote:
>> Do you know of detailed texts that are public domain? If
>> so let's have 'em!
>>
>>
>
> And it's not public domain, but it is available as free software:
> check out QSSTV for source code.
It's annoying how many really good pieces of software for amateur radio
are closed-source Windows-only things. I don't know about anyone else,
but I think that rather goes against the spirit of amateur radio. I'd
rather play with something hacker-friendly that I can take apart and
adapt than some big sealed-up box'o'tricks. I wrote a bunch of music
synthesis plugins and made them available free (free as in beer and Free
as in speech). Other people have sent me back little tweaks and
improvements, that I've folded back into the code. That way, *everyone*
gets a better toy to play with, and we all get to learn something.
> If you are interested in sampling theory, check out
> http://www.dspguide.com/ch3/2.htm
At some point I must finish my rewrite (for copyright reasons) of the
Ensoniq Mirage sampling guide. It's got a great explanation of it.
Gordon MM3YEQ
------------------------------
_______________________________________________
Sent via amsat-bb(AT)amsat.org. 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 3, Issue 529
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