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CX2SA > SATDIG 14.04.10 18:56l 966 Lines 34478 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Email etiquette (Alan)
2. Re: Most Hams in Space at one time? (JoAnne Maenpaa)
3. SDR Forum at Dayton (Bob McGwier)
4. Re: Email etiquette - was Re: Re: Moon (Steve Meuse)
5. OX Dxpedition Update (Reid Crowe)
6. Re: Space Debris: (John Heath)
7. Re: Email etiquette - was Re: Re: Moon (Nigel Gunn G8IFF/W8IFF)
8. NH6VB back on the satellites from Hawaii
(Patrick STODDARD (WD9EWK/VA7EWK))
9. AO-7 is not OK (ps8rf Piraja)
10. Re: AO-7 is not OK (Mike Rupprecht)
11. Re: Email etiquette - was Re: Re: Moon (Jonathan Guthrie)
12. 2 Tracker Boxes (Martha)
13. Re: AO-7 is not OK (Tim - N3TL)
14. Re: AO-7 is not OK (i8cvs)
15. Re: AO-7 is not OK (davekn4ok@xxx.xxxx
----------------------------------------------------------------------
Message: 1
Date: Tue, 13 Apr 2010 20:24:08 -0500
From: "Alan" <ve4yz@xxxxxxx.xxx>
Subject: [amsat-bb] Email etiquette
To: <amsat-bb@xxxxx.xxx>
Message-ID: <BAY110-DS186653F5CFF4CE825148B8EB100@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
http://en.wikipedia.org/wiki/Posting_style
The way this thread is going can the spellin 'n grammer nazis be far behind?
... much too much top and bottom stuff deleted ...
------------------------------
Message: 2
Date: Tue, 13 Apr 2010 20:49:17 -0500
From: "JoAnne Maenpaa" <k9jkm@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Most Hams in Space at one time?
To: <amsat-bb@xxxxx.xxx>
Message-ID: <002001cadb74$b2793e60$176bbb20$@xxx>
Content-Type: text/plain; charset="us-ascii"
> Please cite the names and call signs.
Hope this helps ...
SB SAT @ AMSAT $ANS-101.04
Ten Hams in Orbit Now
AMSAT News Service Bulletin 101.04
>From AMSAT HQ SILVER SPRING, MD.
April 11, 2010
To All RADIO AMATEURS
BID: $ANS-101.04
Six of the seven astronauts on the shuttle Discovery are licensed
radio amateurs and will join four radio hams already on the Inter-
national Space Station (ISS).
The shuttle Discovery (STS131) crew consists of:
Dorothy Metcalf-Lindenburger, KE5DAT
Stephanie Wilson, KD5DZE
Naoko Yamazaki, KE5DAS
James P. Dutton, Jr., KE5HOE,
Rick Mastracchio, KC5ZTE,
Clayton Anderson, KD5PLA
Alan Poindexter
Already onboard the ISS are radio hams:
Tracy Caldwell Dyson, KF5DBF
Timothy J. Creamer, KC5WKI
Soichi Noguchi, KD5TVP
Mikhail Kornienko, RN3BF
along with Oleg Kotov and Alexander Skvortsov.
[ANS thanks SouthGate ARC and ISS Fan Club for the above information]
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
Editor, AMSAT News Service
Copy Editor, AMSAT Journal
------------------------------
Message: 3
Date: Tue, 13 Apr 2010 22:31:19 -0400
From: Bob McGwier <n4hy@xxxxxxxxxx.xxx>
Subject: [amsat-bb] SDR Forum at Dayton
To: HPSDR list <hpsdr@xxxxx.xxxxxxxxx.xxx>
Cc: 'AMSAT-BB' <amsat-bb@xxxxx.xxx>, Flex Edge
<flexedge@xxxxxxxxxx.xxx>, FlexRadio List <flexradio@xxxxxxxxxx.xxx>,
"discuss-gnuradio@xxx.xxxx <discuss-gnuradio@xxx.xxx>, 'dttsp-linux'
<dttsp-linux@xxxxxxxxxxx.xxx>
Message-ID: <4BC528F7.4000409@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Speakers at Dayton SDR Forum 2:30-5 PM for Friday May 14.
Me, N4HY "SDR status, ARRL SDR committee evolution"
Lyle Johnson "Choices in Embedded DSP for SDR"
Scotty Cowling, "Open HPSDR Status"
John Melton, "Linux ghpsdr"
Gerald Youngblood, "Flex Radio new offerings, amateur and commercial
(Flex 1500, New V/U satellite capable add on, etc.)
Jeremy McDermond "MacHPSDR"
Average length of talk 25 minutes but this is the list. I will work
with each author to square away the time and get it into Dayton for the
program.
Thank you all for volunteering! Looks like a great year indeed. I am
very excited.
Bob
N4HY
------------------------------
Message: 4
Date: Wed, 14 Apr 2010 00:39:04 -0400
From: Steve Meuse <smeuse@xxxx.xxx>
Subject: [amsat-bb] Re: Email etiquette - was Re: Re: Moon
To: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx Gordon JC Pearce <gordonjcp@xxxx.xxx>
Message-ID: <20100414043904.GC15302@xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Nigel Gunn G8IFF/W8IFF expunged (nigel@xxxxx.xxxxx
> Top posting is the better option.
My favorite annoyance are people who post 1 line of text but have 5 lines of
a .sig :)
> --
> Nigel A. Gunn, 1865 El Camino Drive, Xenia, OH 45385-1115, USA. tel +1
937 825 5032
> Amateur Radio G8IFF W8IFF (was KC8NHF), e-mail nigel@xxxxx.xxx www
http://www.ngunn.net
> Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pigs QRP
Club International #385,
> Dayton ARA #2128, AMSAT-NA LM-1691, AMSAT-UK 0182, MKARS,
ALC, GCARES, XWARN.
-Steve
------------------------------
Message: 5
Date: Wed, 14 Apr 2010 06:09:23 -0300
From: Reid Crowe <reid.crowe@xxxxx.xxx>
Subject: [amsat-bb] OX Dxpedition Update
To: amsat-bb@xxxxx.xxx
Message-ID: <4BC58643.1020403@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I just wanted to give everyone an update on an upcoming QTH change.
Although I am scheduled to be in Thule until April 23rd, there is a
chance I could leave as early as April 21st. I will be going to Wallops
Island, VA to put our radar equipment on a P-3 aircraft and do flight
tests.
I will be returning to Greenland on May 1st (although there is talk that
it will be pushed back to May 4). I will be in Sondrestrom, grid
GP47pa, for two weeks before returning to Thule for two more weeks
around May 18.
Thanks to everyone that has tried to work me. You've made this trip a
lot of fun!
73,
Reid, OX/N0RC
------------------------------
Message: 6
Date: Wed, 14 Apr 2010 09:14:38 +0000 (GMT)
From: John Heath <g7hia@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Space Debris:
To: w3hf@xxxx.xxx
Cc: Amsat <amsat-bb@xxxxx.xxx>
Message-ID: <587899.47026.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
hi steve,
thanks for an informative post.
good to see the bb doing what it does best.
73 john g7hia
________________________________
From: Stephen Melachrinos <melachri@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Wednesday, 14 April, 2010 0:22:34
Subject: [amsat-bb] Re: Space Debris:
Greg -
I didn't see anyone else reply, so I'll try.
No, it's not coincidence. After the Iridium collision last year, the US Air
Force decided it was in everyone's best interest for them to run conjunction
analyses against many more space objects than they had previously analyzed,
and report their predictions to system owners. Previously, their concern was
primarily the US government's spacecraft, so we (in the amateur community)
and many commercial operators never knew what was happening to our birds
unless we did (or paid for) the work ourselves. But the collision (as well
as the Chinese ASAT demonstration) showed that the resulting debris fields
were a major hazard to everyone, themselves included. So they must have
allocated more resources to the problem, as this is a massive undertaking.
(Note that some reports say that the US has about 20,000 objects that are
tracked and cataloged. In theory, this means propagating the ephemeris of
all of these for some number of days and comparing all possible
combinations across the ti!
me period of the analysis.)
Unfortunately, many (if not most) of the objects no longer have maneuvering
capability. If a vehicle can maneuver, these warnings give them time to try
and increase the separation prior to the predicted close approach. (You
might have heard of some times when a space shuttle does one of these
maneuvers.) But if you can't maneuver (as is the case with AO-51), all we
can do is watch and wait.
Steve
W3HF
Apr 13, 2010 01:45:32 AM, ko6th_greg@xxxxxxx.xxx wrote:
> Is it just a coincidence that these warnings seem to be coming pretty
often recently, or did NORAD change their reporting procedures, or is
> all the junk up there getting to critical mass where nothing is safe? It
seems like we're heading into a situation like nuclear fission, where
> you get enough stuff interacting, and it sets up a chain reaction of
collisions.
>
> Greg KO6TH
_______________________________________________
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: Wed, 14 Apr 2010 12:54:08 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: Email etiquette - was Re: Re: Moon
To: amsat-bb@xxxxx.xxx
Message-ID: <4BC5BAF0.6080300@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Only 4 lines of sig. The 2 dashes are the delimiter put in by the e-mail
client.
Could be worse. I could put the sig at the top!
Also bugs me when people dont crop the recipient list.
On 14-Apr-10 04:39, Steve Meuse wrote:
> Nigel Gunn G8IFF/W8IFF expunged (nigel@xxxxx.xxxxx
>
>> Top posting is the better option.
>
> My favorite annoyance are people who post 1 line of text but have 5 lines
of a .sig :)
--
Nigel A. Gunn, 1865 El Camino Drive, Xenia, OH 45385-1115, USA. tel +1 937
825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF), e-mail nigel@xxxxx.xxx www
http://www.ngunn.net
Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pigs QRP
Club International #385,
Dayton ARA #2128, AMSAT-NA LM-1691, AMSAT-UK 0182, MKARS, ALC,
GCARES, XWARN.
------------------------------
Message: 8
Date: Wed, 14 Apr 2010 08:48:22 -0700 (PDT)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] NH6VB back on the satellites from Hawaii
To: amsat-bb@xxxxx.xxx
Message-ID: <345506.21685.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
On Saturday (10 April) morning, there was an HO-68 SSB/CW pass that
went from the north toward the Pacific Ocean. I was out at my normal
Phoenix QTH (DM33xp/DM43ap boundary), and worked 3 stations. Early
in the pass, John VE8EV called me from CP38. I've worked John in the
past when I was on a road trip, and this was the first time I have
heard him - or worked him - from my "home QTH". After that, Mike
KC9ELU in Indiana called me. Then I went back to CQing, until the
third station I heard on that pass called me - Peter NH6VB. I
remembered seeing his posts to the -BB last month about getting a new
satellite radio, and then trying to get SatPC32 working again. We
ended up chatting for a few minutes, as the satellite was approaching
LOS for me. It was fun to work VE8EV and KC9ELU, but hearing NH6VB
calling me on HO-68 in SSB was a huge - and pleasant - surprise.
After the pass, Peter sent me an e-mail explaining his setup. His
larger Yagis are still on the ground, but he was using an Arrow
Yagi until those other antennas are back on his tower. For those
that missed AA5UK/KH6 recently, and have not heard the only resident
station working the SSB satellites from Hawaii in recent years
(WH6BIE), we may now have another option for those looking to work
Hawaii via satellite in modes other than FM.
Hopefully Peter will show up on more passes, as he continues to get
his satellite station back on the air. And, maybe, we can return
this list to its regularly-scheduled subject matter... :-)
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 9
Date: Wed, 14 Apr 2010 14:22:28 +0300
From: ps8rf Piraja <ps8rf@xxxxxxx.xxx>
Subject: [amsat-bb] AO-7 is not OK
To: <amsat-bb@xxxxx.xxx>
Message-ID: <SNT121-W58491567B5886F96B9C99AE0100@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Some days we are seeing very strange behavior in the AO-7. In some orbits
can only hear the feedback on the downlink when the satellite is approaching
my station at about 30 degrees elevation, before is impossible to hear any
signal via AO-7. Using two pre-amplifier, one in the TS 2000x and the other
with 0.6 noise with 20 dB gain. During the orbits we transmiting power with
of 30 watts. The satellite does not respond. Tried with 15 watts It was
then that we hear at certain points on the downlink audio too low. Its best
performance is when the satellite is almost 90 degrees from my station.
Yet it seems that the satellite is asking for help.
This seems the batteries are not getting enough loads. Or maybe it's
excessive use of power by the users of the satellite.
Maybe it's time for the users of AO-7 rethink the best ways to keep QSO
through it, such as the use of LOW POWER so that over time the satellite is
stabilized.
"Long live the AO-7"
73'
Piraja, PS8RF
The Amateur Radio is supportive and helpful in any circumstance.
_________________________________________________________________
Voc? sabia que seu navegador te ajuda a ficar longe de v?rus? Leia mais
sobre isso.
http://www.microsoft.com/brasil/windows/internet-explorer/?WT.mc_id=1500
------------------------------
Message: 10
Date: Wed, 14 Apr 2010 18:25:03 +0200
From: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>
Subject: [amsat-bb] Re: AO-7 is not OK
To: "'ps8rf Piraja'" <ps8rf@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <000301cadbef$098d91e0$1ca8b5a0$@xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Piraja,
Yes, I made similar observations. If the CW is active on 70cm you can hear
sometimes a very strong deviation in frequency.
The CW beacon partly not decodable. I agree with you it could be an effect
by low batteries or due heavy usage.
See some graphs here: http://www.dk3wn.info/p/?cat=21
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
Auftrag von ps8rf Piraja
Gesendet: Mittwoch, 14. April 2010 13:22
An: amsat-bb@xxxxx.xxx
Betreff: [amsat-bb] AO-7 is not OK
Some days we are seeing very strange behavior in the AO-7. In some orbits
can only hear the feedback on the downlink when the satellite is approaching
my station at about 30 degrees elevation, before is impossible to hear any
signal via AO-7. Using two pre-amplifier, one in the TS 2000x and the other
with 0.6 noise with 20 dB gain. During the orbits we transmiting power with
of 30 watts. The satellite does not respond. Tried with 15 watts It was
then that we hear at certain points on the downlink audio too low. Its best
performance is when the satellite is almost 90 degrees from my station.
Yet it seems that the satellite is asking for help.
This seems the batteries are not getting enough loads. Or maybe it's
excessive use of power by the users of the satellite.
Maybe it's time for the users of AO-7 rethink the best ways to keep QSO
through it, such as the use of LOW POWER so that over time the satellite is
stabilized.
"Long live the AO-7"
73'
Piraja, PS8RF
The Amateur Radio is supportive and helpful in any circumstance.
_________________________________________________________________
Voc? sabia que seu navegador te ajuda a ficar longe de v?rus? Leia mais
sobre isso.
http://www.microsoft.com/brasil/windows/internet-explorer/?WT.mc_id=1500
_______________________________________________
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: Wed, 14 Apr 2010 11:40:39 -0500
From: Jonathan Guthrie <ka8kpn@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Email etiquette - was Re: Re: Moon
To: amsat-bb@xxxxx.xxx
Message-ID: <4BC5F007.9010001@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
The last time I set up a mailing list, the list manager was insistent
that I did not want to set the "reply-to" address to the list address,
noting that doing that removed any "reply-to" field that the sender put
in there, which was a loss of important data for those users who put
data in that header field. It also pointed out that it made private
messages harder to do, and gave it a nonzero probability that you would
respond to the group when you intended to respond to the individual.
The configuration pages linked to a newsgroup post somewhere of someone
ranting about the practice and proving that it was the wrong thing to do.
Nevertheless, I selected that option and I will do it again. Because
unless you choose that option, the most efficient way for me to reply to
the group is to do a reply all. (Well, it was. This new version of
Thunderbird has a "reply to group" option. Woot!) At that point, I have
to trim the recipient list in order to send it only to the group, which
is almost always what I'm trying to do. It's a pain, so most of the
time I don't bother.
Since most responses to list messages are intended for the list and not
to the individual who wrote the message you're responding to, not
abusing "reply-to" in that fashion deoptimizes the typical case in order
to be technically correct. That is, in my opinion, a dumb thing to do
in order to preserve the information in the rarely-used reply-to field.
I mention this because this list is set up in the technically correct
way, and I have several times sent messages to individuals when I
intended them to go to the list. That is MY particular annoyance.
On 04/14/2010 07:54 AM, Nigel Gunn G8IFF/W8IFF wrote:
> Only 4 lines of sig. The 2 dashes are the delimiter put in by the e-mail
client.
> Could be worse. I could put the sig at the top!
> Also bugs me when people dont crop the recipient list.
>
>
> On 14-Apr-10 04:39, Steve Meuse wrote:
>> Nigel Gunn G8IFF/W8IFF expunged (nigel@xxxxx.xxxxx
>>
>>> Top posting is the better option.
>>
>> My favorite annoyance are people who post 1 line of text but have 5 lines
of a .sig :)
>
>
!DSPAM:117,4bc5f018191152065711076!
------------------------------
Message: 12
Date: Wed, 14 Apr 2010 12:54:19 -0400
From: Martha <martha@xxxxx.xxx>
Subject: [amsat-bb] 2 Tracker Boxes
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID:
<y2l956751cf1004140954mea7a12cev6fbdc52caf5a3a19@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Due to 2 cancellations, I now have 2 Tracker boxes in stock. You can place
your order on the AMSAT store found on the AMSAT website. The first 2 orders
will get the boxes.
--
73- Martha
------------------------------
Message: 13
Date: Wed, 14 Apr 2010 10:00:05 -0700 (PDT)
From: Tim - N3TL <n3tl@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-7 is not OK
To: Mike Rupprecht <mail@xxxxxxxxxxxxxx.xx>, ps8rf Piraja
<ps8rf@xxxxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID: <910503.39342.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Mike, Piraja and all,
Please take a moment to visit the page on the AO-7 Web site that includes an
essay from AO-7 Project Manager Jan King, W3GEY. You will find that essay
here:
http://www.planetemily.com/ao7/history.php?PHPSESSID=5cc1e3be993405e687967faff
cac4407
According to Jan, AO-7?no longer uses?batteries in its current condition. It
is powered completely by the solar array. He explains fully what he believes
to have happened. Here are some excepts for the full essay Jan wrote, which
appears on the page I provided?the link to (NOTE - scroll down toward the
borrom of the page to find Jan's report):
"I am certain what has happened (and I know why): The battery did fail
short. Virtually all of the cells failed in a shorted mode eventually. This
shorted condition placed a shunt across the solar arrays and prevented
current from going to the satellite loads (i.e. the transponders, in
particular). Some time before G3IOR reported hearing the spacecraft again
the short on one of the cells (1 out of 10) failed a second time. This time,
it went from short to "open." When it went open this released the shunt that
was pulling the array voltage down and allowed the current to pass to the
satellite loads. Since there is no battery at all now (because one cell went
open), when AO-7 goes into eclipse with each orbit, the satellite has no
power to operate and shuts down in the dark."
?
Also:
?
"People should realize that the solar arrays are old and they don't put out
more than a few watts now. That's the only power available to run the
transponders.So, if they uplink too much power it will just cause the
transmitter to sort of 'cave in.' The voltage on the satellite bus begins to
sag badly when a heavy demand is placed on the transponder (by a large
uplinking signal) since there is nothing there to regulate it and then the
oscillators in the receiver and transmitter chain start changing frequency.
People call this 'FMing' and that is what is going on."
?
Jan's entire essay is fascinating.
The primary reason I consider AO-7 the flagship of the amateur satellite
fleet is?her amazing story and legacy. I consider myself blessed and
fortunate to have an opportunity to work the "Grand Old Girl" now, more than
25 years after she reached orbit. Even on her bad days - and today appears
to be one, as I write this - I am able to clearly copy my CW signal on the
downlink from about 20 degrees elevation running only 5 watts out of a Yaesu
FT-817 from my handheld Elk dual-band yagi - and working from inside my home
on the second floor, my uplink signal shooting through the second-floor
ceiling and roof. I believe she spoils us on her good days with the ability
to enable contacts that span oceans and continents - even with a station
like mine.
?
I am grateful for every orbit during which I am able to hear such an amazing
piece of amateur-radio hardware still working as hard as she can.
?
73 to all,
?
Tim - N3TL
________________________________
From: Mike Rupprecht <mail@xxxxxxxxxxxxxx.xx>
To: ps8rf Piraja <ps8rf@xxxxxxx.xxx>; amsat-bb@xxxxx.xxx
Sent: Wed, April 14, 2010 12:25:03 PM
Subject: [amsat-bb] Re: AO-7 is not OK
Hi Piraja,
Yes, I made similar observations. If the CW is active on 70cm you can hear
sometimes a very strong deviation in frequency.
The CW beacon partly not decodable. I agree with you it could be an effect
by low batteries or due heavy usage.
See some graphs here: http://www.dk3wn.info/p/?cat=21
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
Auftrag von ps8rf Piraja
Gesendet: Mittwoch, 14. April 2010 13:22
An: amsat-bb@xxxxx.xxx
Betreff: [amsat-bb] AO-7 is not OK
Some days we are seeing very strange behavior in the AO-7.? In some orbits
can only hear the feedback on the downlink when the satellite is approaching
my station at about 30 degrees elevation, before is impossible to hear any
signal via AO-7. Using two pre-amplifier, one in the? TS 2000x and the other
with 0.6 noise with 20 dB gain. During the orbits we transmiting power with
of 30 watts.? The satellite does not respond. Tried with 15 watts It was
then that we hear at certain points on the downlink audio too low. Its best
performance? is when the satellite is almost 90 degrees from my station.
Yet it seems that the satellite is asking for help.
This seems the batteries are not getting enough loads. Or maybe it's
excessive use of power by the users of the satellite.
Maybe it's time for the users of AO-7 rethink the best ways to keep QSO
through it, such as the use of LOW POWER so that over time the satellite is
stabilized.
"Long live the AO-7"
73'
Piraja, PS8RF
The Amateur Radio is supportive and helpful in any circumstance.
??? ??? ??? ? ??? ??? ?
_________________________________________________________________
Voc? sabia que seu navegador te ajuda a ficar longe de v?rus? Leia mais
sobre isso.
http://www.microsoft.com/brasil/windows/internet-explorer/?WT.mc_id=1500
_______________________________________________
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: 14
Date: Wed, 14 Apr 2010 19:27:23 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: AO-7 is not OK
To: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>, "'ps8rf Piraja'"
<ps8rf@xxxxxxx.xxx>, "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <000001cadbf8$1623d5a0$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Piraja and Mike
As far I know actually the batteries of AO-7 are an open circuit and this is
why the satellite started to work again.
Before for many years AO-7 was silent because the batteries where in a
short circuit condition.
AO-7 is actually working only when the solar panels are illuminated and so
the panels power is managed only by the BCR (Battery Charge Regulator)
but the batteries are out of service.
Yesterday April 13 during revolution 62037 AO-7 was in Mode-A over
Europe and signals where strong and clear without the well know FM-ing
normally affecting the Mode-B transponder.
73" de
i8CVS Domenico
----- Original Message -----
From: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>
To: "'ps8rf Piraja'" <ps8rf@xxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Wednesday, April 14, 2010 6:25 PM
Subject: [amsat-bb] Re: AO-7 is not OK
Hi Piraja,
Yes, I made similar observations. If the CW is active on 70cm you can hear
sometimes a very strong deviation in frequency.
The CW beacon partly not decodable. I agree with you it could be an effect
by low batteries or due heavy usage.
See some graphs here: http://www.dk3wn.info/p/?cat=21
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
Auftrag von ps8rf Piraja
Gesendet: Mittwoch, 14. April 2010 13:22
An: amsat-bb@xxxxx.xxx
Betreff: [amsat-bb] AO-7 is not OK
Some days we are seeing very strange behavior in the AO-7. In some orbits
can only hear the feedback on the downlink when the satellite is approaching
my station at about 30 degrees elevation, before is impossible to hear any
signal via AO-7. Using two pre-amplifier, one in the TS 2000x and the other
with 0.6 noise with 20 dB gain. During the orbits we transmiting power with
of 30 watts. The satellite does not respond. Tried with 15 watts It was
then that we hear at certain points on the downlink audio too low. Its best
performance is when the satellite is almost 90 degrees from my station.
Yet it seems that the satellite is asking for help.
This seems the batteries are not getting enough loads. Or maybe it's
excessive use of power by the users of the satellite.
Maybe it's time for the users of AO-7 rethink the best ways to keep QSO
through it, such as the use of LOW POWER so that over time the satellite is
stabilized.
"Long live the AO-7"
73'
Piraja, PS8RF
The Amateur Radio is supportive and helpful in any circumstance.
_________________________________________________________________
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------------------------------
Message: 15
Date: Wed, 14 Apr 2010 13:45:40 -0400
From: davekn4ok@xxx.xxx
Subject: [amsat-bb] Re: AO-7 is not OK
To: amsat-bb@xxxxx.xxx
Message-ID: <8CCAA116EA46656-D10-E54A@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="utf-8"
Great Reply Tim,
I try to tell the ops on AO7 to watch there input power. This old lady just
can't handle us old men pumping the high power into her.
By the way, I had some very distorted signal the other morning and was so
afraid she was damaged.
Best 73's AO7 ops,
See ya on the bird!
Dave, kn4ok
Mike, Piraja and all,
Please take a moment to visit the page on the AO-7 Web site that includes an
ssay from AO-7 Project Manager Jan King, W3GEY. You will find that essay here:
ttp://www.planetemily.com/ao7/history.php?PHPSESSID=5cc1e3be993405e687967faffc
ac4407
According to Jan, AO-7 no longer uses batteries in its current condition. It
is
owered completely by the solar array. He explains fully what he believes to
ave happened. Here are some excepts for the full essay Jan wrote, which
appears
n the page I provided the link to (NOTE - scroll down toward the borrom of the
age to find Jan's report):
"I am certain what has happened (and I know why): The battery did fail short.
irtually all of the cells failed in a shorted mode eventually. This shorted
ondition placed a shunt across the solar arrays and prevented current from
oing to the satellite loads (i.e. the transponders, in particular). Some time
efore G3IOR reported hearing the spacecraft again the short on one of the
cells
1 out of 10) failed a second time. This time, it went from short to "open."
hen it went open this released the shunt that was pulling the array voltage
own and allowed the current to pass to the satellite loads. Since there is no
attery at all now (because one cell went open), when AO-7 goes into eclipse
ith each orbit, the satellite has no power to operate and shuts down in the
ark."
lso:
People should realize that the solar arrays are old and they don't put out
more
han a few watts now. That's the only power available to run the
ransponders.So, if they uplink too much power it will just cause the
ransmitter to sort of 'cave in.' The voltage on the satellite bus begins to
sag
adly when a heavy demand is placed on the transponder (by a large uplinking
ignal) since there is nothing there to regulate it and then the oscillators in
he receiver and transmitter chain start changing frequency. People call this
FMing' and that is what is going on."
an's entire essay is fascinating.
The primary reason I consider AO-7 the flagship of the amateur satellite fleet
s her amazing story and legacy. I consider myself blessed and fortunate to
have
n opportunity to work the "Grand Old Girl" now, more than 25 years after she
eached orbit. Even on her bad days - and today appears to be one, as I write
his - I am able to clearly copy my CW signal on the downlink from about 20
egrees elevation running only 5 watts out of a Yaesu FT-817 from my handheld
lk dual-band yagi - and working from inside my home on the second floor, my
plink signal shooting through the second-floor ceiling and roof. I believe she
poils us on her good days with the ability to enable contacts that span oceans
nd continents - even with a station like mine.
am grateful for every orbit during which I am able to hear such an amazing
iece of amateur-radio hardware still working as hard as she can.
3 to all,
im - N3TL
_______________________________
rom: Mike Rupprecht <mail@xxxxxxxxxxxxxx.xx>
o: ps8rf Piraja <ps8rf@xxxxxxx.xxx>; amsat-bb@xxxxx.xxx
ent: Wed, April 14, 2010 12:25:03 PM
ubject: [amsat-bb] Re: AO-7 is not OK
Hi Piraja,
Yes, I made similar observations. If the CW is active on 70cm you can hear
ometimes a very strong deviation in frequency.
he CW beacon partly not decodable. I agree with you it could be an effect
y low batteries or due heavy usage.
ee some graphs here: http://www.dk3wn.info/p/?cat=21
73, Mike
K3WN
----Urspr?ngliche Nachricht-----
on: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
uftrag von ps8rf Piraja
esendet: Mittwoch, 14. April 2010 13:22
n: amsat-bb@xxxxx.xxx
etreff: [amsat-bb] AO-7 is not OK
ome days we are seeing very strange behavior in the AO-7. In some orbits
an only hear the feedback on the downlink when the satellite is approaching
y station at about 30 degrees elevation, before is impossible to hear any
ignal via AO-7. Using two pre-amplifier, one in the TS 2000x and the other
ith 0.6 noise with 20 dB gain. During the orbits we transmiting power with
f 30 watts. The satellite does not respond. Tried with 15 watts It was
hen that we hear at certain points on the downlink audio too low. Its best
erformance is when the satellite is almost 90 degrees from my station.
et it seems that the satellite is asking for help.
This seems the batteries are not getting enough loads. Or maybe it's
xcessive use of power by the users of the satellite.
Maybe it's time for the users of AO-7 rethink the best ways to keep QSO
hrough it, such as the use of LOW POWER so that over time the satellite is
tabilized.
"Long live the AO-7"
73'
Piraja, PS8RF
The Amateur Radio is supportive and helpful in any circumstance.
________________________________________________________________
oc? sabia que seu navegador te ajuda a ficar longe de v?rus? Leia mais
obre isso.
ttp://www.microsoft.com/brasil/windows/internet-explorer/?WT.mc_id=1500
______________________________________________
ent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
ot an AMSAT-NA member? Join now to support the amateur satellite program!
ubscription settings: http://amsat.org/mailman/listinfo/amsat-bb
______________________________________________
ent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
ot an AMSAT-NA member? Join now to support the amateur satellite program!
ubscription settings: http://amsat.org/mailman/listinfo/amsat-bb
______________________________________________
ent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
ot an AMSAT-NA member? Join now to support the amateur satellite program!
ubscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
_______________________________________________
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 5, Issue 166
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