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CX2SA > SATDIG 01.03.18 00:19l 795 Lines 27831 Bytes #999 (0) @ WW
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Sent: 180228/2217Z @:CX2SA.SAL.URY.SOAM #:36566 [Salto] FBB7.00e $:AMSATBB1385
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Looking for someone from AMSAT/sat expert (E.Mike McCardel)
2. Re: Looking for someone from AMSAT/sat expert (Sterling Coffey)
3. Victor Kudielka and AO-13 (Martin Davidoff)
4. L/v operation on AO-92 (CEE)
5. Re: L/v operation on AO-92 (Jean Marc Momple)
6. Re: Yoshihide Kozai (Robert McGwier)
7. Amsat Journal - South Atlantic Anomoly (Roy Dean)
8. Re: Amsat Journal - South Atlantic Anomoly (E.Mike McCardel)
9. AMSAT Website Password Reset Message (Paul Stoetzer)
10. Re: Looking for someone from AMSAT/sat expert (Chris Thompson)
11. Re: Amsat Journal - South Atlantic Anomoly (Jerry Buxton)
12. Re: Amsat Journal - South Atlantic Anomoly (Pedro Converso)
----------------------------------------------------------------------
Message: 1
Date: Wed, 28 Feb 2018 09:23:47 -0500
From: "E.Mike McCardel" <mccardelm@?????.???>
To: Roy Dean <royldean@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Looking for someone from AMSAT/sat expert
Message-ID: <4B0134E1-EEAC-494F-A669-E3D40C0B7F80@?????.???>
Content-Type: text/plain; charset=utf-8
Just thinking out loud here.
Could they do this via echolink?
EMike McCardel, AA8EM
Rotating Editor AMSAT News Service
Sent from my iPhone
> On Feb 28, 2018, at 7:14 AM, Roy Dean <royldean@?????.???> wrote:
>
> QRZ lists address of Abington PA area (3 land caught my eye).
>
> I'm more interested in what repeater it is, so I can listen in!
>
> -Roy
> K3RLD
>
>
>> Where is "here"?
>
>
>
> Jerry Buxton, N?JY
>
>
>
> On 2/27/2018 19:37, Joe N3XLS via AMSAT-BB wrote:
>>> * Local club here is looking for someone that can speak about the AMSAT
>> mission and/or workig satellites. Something similar to what AMSAT
>> President Joe Spier K6WAO did with hamradionow at hamcation. The
>> presentation will be over the air on the local repeater. *>* Please
>> contact me directly and i will send your information along to the
>> coordinator. *>* _______________________________________________ *>* Sent
>> via AMSAT-BB at amsat.org. <http://www.amsat.org/mailman/listinfo/amsat-bb>
>> AMSAT-NA makes this open forum available *>* to all interested persons
>> worldwide without requiring membership. Opinions expressed *>* are solely
>> those of the author, and do not reflect the official views of AMSAT-NA. *>*
>> Not an AMSAT-NA member? Join now to support the amateur satellite
program! *
>>> * Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>> <http://www.amsat.org/mailman/listinfo/amsat-bb>*
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Wed, 28 Feb 2018 08:46:48 -0600
From: Sterling Coffey <kawfey@?????.???>
To: "E.Mike McCardel" <mccardelm@?????.???>
Cc: amsat-bb@?????.???? Roy Dean <royldean@?????.???>
Subject: Re: [amsat-bb] Looking for someone from AMSAT/sat expert
Message-ID:
<CACxCfFrkC5fnTvZo1yY335TvhCHfEbTG-t9Em2ZjMN1KPjdMSw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
I know this is a hobby of radios and everything, but wouldn't this be
better as a skype presentation during a club meeting, or a webex or
go2meeting?
If such a talk is successful over a repeater, I'd like to know. Maybe
that's what ham radio needs to get more repeaters out of silence.
On Wed, Feb 28, 2018 at 8:23 AM, E.Mike McCardel <mccardelm@?????.???>
wrote:
> Just thinking out loud here.
> Could they do this via echolink?
>
> EMike McCardel, AA8EM
> Rotating Editor AMSAT News Service
> Sent from my iPhone
>
> > On Feb 28, 2018, at 7:14 AM, Roy Dean <royldean@?????.???> wrote:
> >
> > QRZ lists address of Abington PA area (3 land caught my eye).
> >
> > I'm more interested in what repeater it is, so I can listen in!
> >
> > -Roy
> > K3RLD
> >
> >
> >> Where is "here"?
> >
> >
> >
> > Jerry Buxton, N?JY
> >
> >
> >
> > On 2/27/2018 19:37, Joe N3XLS via AMSAT-BB wrote:
> >>> * Local club here is looking for someone that can speak about the AMSAT
> >> mission and/or workig satellites. Something similar to what AMSAT
> >> President Joe Spier K6WAO did with hamradionow at hamcation. The
> >> presentation will be over the air on the local repeater. *>* Please
> >> contact me directly and i will send your information along to the
> >> coordinator. *>* _______________________________________________ *>*
> Sent
> >> via AMSAT-BB at amsat.org. <http://www.amsat.org/mailman/
> listinfo/amsat-bb>
> >> AMSAT-NA makes this open forum available *>* to all interested persons
> >> worldwide without requiring membership. Opinions expressed *>* are
> solely
> >> those of the author, and do not reflect the official views of AMSAT-NA.
> *>*
> >> Not an AMSAT-NA member? Join now to support the amateur satellite
> program! *
> >>> * Subscription settings: http://www.amsat.org/mailman/
> listinfo/amsat-bb
> >> <http://www.amsat.org/mailman/listinfo/amsat-bb>*
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions expressed
> > are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 3
Date: Wed, 28 Feb 2018 10:25:32 -0500
From: Martin Davidoff <mdavidoff42@?????.???>
To: Robert McGwier <rwmcgwier@?????.???>
Cc: amsat bb <amsat-bb@?????.???>
Subject: [amsat-bb] Victor Kudielka and AO-13
Message-ID:
<CA+9cpqV1L6tQw6UvP3ZAPgnNUaaJLPJU4UJeEq=MWhNgRzg+Kg@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
The recent mention of the work by Kozai and Lidov and it's relation to
AO-13 stimulated a number of long dormant memories. I've always been in
awe of Dr. Victor Kudielka, OE1VKW who, using 80286 (?) technology, was
able to apply their work to predict the demise of AO-13.
Prior to launch I don't think any of us had considered the
possibility that asymmetries in the shape of the earth could cause
fluctuations in the eccentricity of AO-13's final orbit that would, without
affecting the spacecraft's total energy, lower the perigee to the point
where re-entry would occur.
Which leads me to wonder about Victor's status these days. I can't
find any reference to him post 2013. Any info would be appreciated.
73, Martin, k2ubc
On Wed, Feb 28, 2018 at 8:00 AM, Robert McGwier <rwmcgwier@?????.???> wrote:
> Yes, AO 13.
>
> On Tue, Feb 27, 2018 at 1:09 PM Gregory Beat <w9gb@??????.???> wrote:
>
> > Jeopardy question?
> >
> > Oscar 13, AO-13
> >
> > greg, w9gb
> >
> > ===
> > Subject: [amsat-bb] Yoshihide Kozai
> >
> > The long scientific life of Kozai ended recently with his death at ~90
> > years old
> >
> > Kozai and Lidov proposed a mechanism for why the Luna 3 probe decayed
> into
> > the Earth's atmosphere when everyone believed it would last "forever".
> >
> > This same mechanism describes the death of which amateur spacecraft?
> >
> > Bob
> > N4HY
> >
> > Sent from iPad Air
> >
> --
> Bob McGwier
> Founder, Federated Wireless, Inc
> Founder and Technical Advisor, HawkEye 360, Inc
> Research Professor Virginia Tech
> Chief Scientist: The Ted and Karyn Hume Center for National Security and
> Technology
> Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
> Faculty Advisor Virginia Tech Amateur Radio Assn, Trustee K4KDJ
> Member of PVRC (Roanoke-Blacksburg), TAPR, life member of ARRL and AMSAT,
> NRVR.ORG (Rocketry)
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 4
Date: Wed, 28 Feb 2018 09:17:03 -0800
From: CEE <cee@????????????.???>
To: AMSAT-BB@?????.???
Subject: [amsat-bb] L/v operation on AO-92
Message-ID: <59f7dc4e-abd7-22a2-df24-bc80bc7904d7@????????????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
with completion of a home brew "cheap yagi" on 1296, would attempt to
work AO-92 on the L/v band. Can anyone suggest how I switch from the
U/v? configuration to L/v on SATPC-32 and other related info?
Thanks - Chuck N7BFO
------------------------------
Message: 5
Date: Wed, 28 Feb 2018 22:06:27 +0400
From: Jean Marc Momple <jean.marc.momple@?????.???>
To: cee@????????????.???
Cc: AMSAT-BB@?????.???
Subject: Re: [amsat-bb] L/v operation on AO-92
Message-ID: <A9870EC9-2025-4167-B902-77A18BE41B3A@?????.???>
Content-Type: text/plain; charset=us-ascii
Hi Chuck,
Very easy, you need to put the frequency in Doppler.SQF file see below
example from mine and use the CAT drop down menu to choose the L/V or U/V
Fx. You may wish to copy the lines I am sending in your Doppler.SQF as
already tested and works fine for me.
AO-92,145880,435350,FM,FM,Nor,0,0,Voice U/V
AO-92,145880,1267300,FM,FM,Nor,0,0,Voice L/V
PCsat32 is quite new to me also and I took about a week to be fully
conversant with it and can understand your difficulties. Once you master it
you will realize that it is probably the best tool we have for the birds.
Somehow tricky at first glance to set it up right but when done it is so
good compared with other soft I used for several years. I am really amazed
and satisfy with it and it is surely worth the few $ spent particularly that
the money goes in satellite projects.
Hope this help.
73
Jean Marc (3B8DU)
> On Feb 28, 2018, at 9:17 PM, CEE <cee@????????????.???> wrote:
>
> with completion of a home brew "cheap yagi" on 1296, would attempt to work
AO-92 on the L/v band. Can anyone suggest how I switch from the U/v
configuration to L/v on SATPC-32 and other related info?
>
> Thanks - Chuck N7BFO
>
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Wed, 28 Feb 2018 14:51:31 -0500
From: Robert McGwier <rwmcgwier@?????.???>
To: Jim Beeson <jim@??????.??>
Cc: amsat bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Yoshihide Kozai
Message-ID:
<CA+K5gzcuBuHPV6aExfifqC4RnHtmfbb_mtHGyf+B5bhNV3iP=w@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
WB5AAA it is always my fault. We were all ignorant so I am happy to share
blame with anyone who wants to step up.
Bob
On Tue, Feb 27, 2018 at 1:03 PM, Jim Beeson <jim@??????.??> wrote:
> Wow! Cool. RIP
>
>
>
> > On Feb 27, 2018, at 11:10 AM, Robert McGwier <rwmcgwier@?????.???>
> wrote:
> >
> > The long scientific life of Kozai ended recently with his death at ~90
> > years old
> >
> > Kozai and Lidov proposed a mechanism for why the Luna 3 probe decayed
> into
> > the Earth's atmosphere when everyone believed it would last "forever".
> >
> > This same mechanism describes the death of which amateur spacecraft?
> >
> > Bob
> > N4HY
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions expressed
> > are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
>
--
Bob McGwier
Founder, Federated Wireless, Inc
Founder and Technical Advisor, HawkEye 360, Inc
Research Professor Virginia Tech
Chief Scientist: The Ted and Karyn Hume Center for National Security and
Technology
Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
Faculty Advisor Virginia Tech Amateur Radio Assn, Trustee K4KDJ
Member of PVRC (Roanoke-Blacksburg), TAPR, life member of ARRL and AMSAT,
NRVR.ORG (Rocketry)
------------------------------
Message: 7
Date: Wed, 28 Feb 2018 14:55:01 -0500
From: Roy Dean <royldean@?????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] Amsat Journal - South Atlantic Anomoly
Message-ID:
<CADGPg2tf9FhUhB12yb6BjOrktJAMa_N3MR=JKedyH+5_LHXkag@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Just FYI:
In the latest Amsat Journal there is a story about Fox Telemetry that
includes an interesting analysis of restarts in relation to the SAA.
(apologies, I can't remember the name of the author or the title)
By coincidence, one of the YouTube channels I watch is "Curious Droid",
which recently released a video on this exact topic. Serendipitous timing:
https://youtu.be/ErmEiAJG22A
Interested to hear if it's accurate, or just blather - I'm not smart enough
on this topic to distinguish between the two.
---Roy
K3RLD
------------------------------
Message: 8
Date: Wed, 28 Feb 2018 15:04:12 -0500
From: "E.Mike McCardel" <mccardelm@?????.???>
To: Roy Dean <royldean@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Amsat Journal - South Atlantic Anomoly
Message-ID: <E5EB8B81-7BCA-4BBE-AE14-2441A0BA8069@?????.???>
Content-Type: text/plain; charset=utf-8
The article in The AMSAT Journal is:
?Optimally Calculating and Plotting Subpoints for AO-85 CPU Resets? by
Douglas D. Quagliana KA2UPW/5
EMike McCardel, AA8EM
Rotating Editor AMSAT News Service
Sent from my iPhone
> On Feb 28, 2018, at 2:55 PM, Roy Dean <royldean@?????.???> wrote:
>
> Just FYI:
>
> In the latest Amsat Journal there is a story about Fox Telemetry that
> includes an interesting analysis of restarts in relation to the SAA.
> (apologies, I can't remember the name of the author or the title)
>
> By coincidence, one of the YouTube channels I watch is "Curious Droid",
> which recently released a video on this exact topic. Serendipitous timing:
>
> https://youtu.be/ErmEiAJG22A
>
> Interested to hear if it's accurate, or just blather - I'm not smart enough
> on this topic to distinguish between the two.
>
>
> ---Roy
> K3RLD
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Wed, 28 Feb 2018 15:06:38 -0500
From: Paul Stoetzer <n8hm@?????.???>
To: AMSAT BB <amsat-bb@?????.???>
Subject: [amsat-bb] AMSAT Website Password Reset Message
Message-ID:
<CABzOSOoVDHh67Edq3UDSp7_GjF5QeFpr5CDALD6=jebkz1UhQw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Good afternoon,
Earlier this afternoon, many members received a notice that their
password had changed on the AMSAT website. These messages were sent in
error due to ongoing database migration work. There is no need to take
any action.
We apologize for any inconvenience.
73,
Paul Stoetzer, N8HM
Executive Vice President
Radio Amateur Satellite Corporation (AMSAT)
------------------------------
Message: 10
Date: Wed, 28 Feb 2018 15:20:57 -0500
From: Chris Thompson <g0kla@????.???>
To: Sterling Coffey <kawfey@?????.???>
Cc: AMSAT <amsat-bb@?????.???>, "E.Mike McCardel"
<mccardelm@?????.???>, Roy Dean <royldean@?????.???>
Subject: Re: [amsat-bb] Looking for someone from AMSAT/sat expert
Message-ID:
<CAJOf0+sVKS+GRcBVa=x-UOM+hFuOhg1S2228BV_ngZXFM6wHnQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
There are talks on technical topics every week on the Long Island Amateur
Radio Club repeater (LIMARC). They have New York City as an audience of
course. So it definitely works.
Chris
On Wed, Feb 28, 2018 at 9:46 AM, Sterling Coffey <kawfey@?????.???> wrote:
> I know this is a hobby of radios and everything, but wouldn't this be
> better as a skype presentation during a club meeting, or a webex or
> go2meeting?
>
> If such a talk is successful over a repeater, I'd like to know. Maybe
> that's what ham radio needs to get more repeaters out of silence.
>
> On Wed, Feb 28, 2018 at 8:23 AM, E.Mike McCardel <mccardelm@?????.???>
> wrote:
>
> > Just thinking out loud here.
> > Could they do this via echolink?
> >
> > EMike McCardel, AA8EM
> > Rotating Editor AMSAT News Service
> > Sent from my iPhone
> >
> > > On Feb 28, 2018, at 7:14 AM, Roy Dean <royldean@?????.???> wrote:
> > >
> > > QRZ lists address of Abington PA area (3 land caught my eye).
> > >
> > > I'm more interested in what repeater it is, so I can listen in!
> > >
> > > -Roy
> > > K3RLD
> > >
> > >
> > >> Where is "here"?
> > >
> > >
> > >
> > > Jerry Buxton, N?JY
> > >
> > >
> > >
> > > On 2/27/2018 19:37, Joe N3XLS via AMSAT-BB wrote:
> > >>> * Local club here is looking for someone that can speak about the
> AMSAT
> > >> mission and/or workig satellites. Something similar to what AMSAT
> > >> President Joe Spier K6WAO did with hamradionow at hamcation. The
> > >> presentation will be over the air on the local repeater. *>* Please
> > >> contact me directly and i will send your information along to the
> > >> coordinator. *>* _______________________________________________ *>*
> > Sent
> > >> via AMSAT-BB at amsat.org. <http://www.amsat.org/mailman/
> > listinfo/amsat-bb>
> > >> AMSAT-NA makes this open forum available *>* to all interested persons
> > >> worldwide without requiring membership. Opinions expressed *>* are
> > solely
> > >> those of the author, and do not reflect the official views of
> AMSAT-NA.
> > *>*
> > >> Not an AMSAT-NA member? Join now to support the amateur satellite
> > program! *
> > >>> * Subscription settings: http://www.amsat.org/mailman/
> > listinfo/amsat-bb
> > >> <http://www.amsat.org/mailman/listinfo/amsat-bb>*
> > > _______________________________________________
> > > Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> > > to all interested persons worldwide without requiring membership.
> > Opinions expressed
> > > are solely those of the author, and do not reflect the official views
> of
> > AMSAT-NA.
> > > Not an AMSAT-NA member? Join now to support the amateur satellite
> > program!
> > > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions
> > expressed
> > are solely those of the author, and do not reflect the official views of
> > AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> >
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
--
Chris E. Thompson
chrisethompson@?????.???
g0kla@????.???
------------------------------
Message: 11
Date: Wed, 28 Feb 2018 15:36:06 -0600
From: Jerry Buxton <n0jy@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Amsat Journal - South Atlantic Anomoly
Message-ID: <a46fd45d-9804-7a19-5c71-cbe4bc05b6cf@?????.???>
Content-Type: text/plain; charset=utf-8
Hi Roy,
I follow Curious Droid too and this piece on the SAA, as are his others
in general, are interesting and good information.
>From the Fox-1 perspective, it was known early in the design that the
SAA would/could have a big effect on operation and lifetime so designs
take into account the best choices of COTS parts able to "weather the
storm" as well as the operation of the IHU and radio in general.? The
resets are expected and we believe they may in some instances not even
be noticed by satellite users (other than the reset number increment)
because the radio is designed to operate without the IHU, albeit without
telemetry as well, in the expectation that the IHU will fail sooner than
the RF systems over the lifetime of the satellite.
In addition, the Vanderbilt University radiation experiments on Fox-1A,
Fox-1B, Fox-1C, and Fox-1E are all designed to observe the effects of
the SAA as well as other charged particle events on COTS components.
So at least I enjoy what we see in the SAA including resets, in fact the
occasional reset outside of the SAA or auroral oval is what catches my
eye since it is unexpected!
Jerry Buxton, N?JY
On 2/28/2018 13:55, Roy Dean wrote:
> Just FYI:
>
> In the latest Amsat Journal there is a story about Fox Telemetry that
> includes an interesting analysis of restarts in relation to the SAA.
> (apologies, I can't remember the name of the author or the title)
>
> By coincidence, one of the YouTube channels I watch is "Curious Droid",
> which recently released a video on this exact topic. Serendipitous timing:
>
> https://youtu.be/ErmEiAJG22A
>
> Interested to hear if it's accurate, or just blather - I'm not smart enough
> on this topic to distinguish between the two.
>
>
> ---Roy
> K3RLD
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
>
------------------------------
Message: 12
Date: Wed, 28 Feb 2018 19:12:12 -0300
From: Pedro Converso <pconver@?????.???>
To: Jerry Buxton <n0jy@?????.???>
Cc: AMSAT <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Amsat Journal - South Atlantic Anomoly
Message-ID:
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Interesting comments on South Atlantic Anomaly (SAA)
During PACSATs era, circa 1991, the LUSAT & PACSAT had their memory with
detection of SEU (Single Event Upsets).
They generate ELogs (Error Logs), with time in wich a glitch (radiation)
hit memory data.
The onboard software recorded time of the SEU, therefore knowing time,
satellite position over earth could be obtained.
We did for LUSAT a basic program at that time, that analyze ELogs and
plotted on a map where was the hit produced.
Surprisingly SAA appeared on the map, with more hits right showing at the
place where South Atlantic Anomaly was.
Program also shows operation of the fantastic PG/PB protocol that allowed
upload/download/share messages and large files worldwide.
This program is still operational, can be downloaded and run from
http://amsat.org.ar/SOFTWARE/TRACK1/SHOWLOG.ZIP
73, LU7ABF, Pedro
On Wed, Feb 28, 2018 at 6:36 PM, Jerry Buxton <n0jy@?????.???> wrote:
> Hi Roy,
>
> I follow Curious Droid too and this piece on the SAA, as are his others
> in general, are interesting and good information.
> From the Fox-1 perspective, it was known early in the design that the
> SAA would/could have a big effect on operation and lifetime so designs
> take into account the best choices of COTS parts able to "weather the
> storm" as well as the operation of the IHU and radio in general. The
> resets are expected and we believe they may in some instances not even
> be noticed by satellite users (other than the reset number increment)
> because the radio is designed to operate without the IHU, albeit without
> telemetry as well, in the expectation that the IHU will fail sooner than
> the RF systems over the lifetime of the satellite.
>
> In addition, the Vanderbilt University radiation experiments on Fox-1A,
> Fox-1B, Fox-1C, and Fox-1E are all designed to observe the effects of
> the SAA as well as other charged particle events on COTS components.
>
> So at least I enjoy what we see in the SAA including resets, in fact the
> occasional reset outside of the SAA or auroral oval is what catches my
> eye since it is unexpected!
>
> Jerry Buxton, N?JY
>
> On 2/28/2018 13:55, Roy Dean wrote:
> > Just FYI:
> >
> > In the latest Amsat Journal there is a story about Fox Telemetry that
> > includes an interesting analysis of restarts in relation to the SAA.
> > (apologies, I can't remember the name of the author or the title)
> >
> > By coincidence, one of the YouTube channels I watch is "Curious Droid",
> > which recently released a video on this exact topic. Serendipitous
> timing:
> >
> > https://youtu.be/ErmEiAJG22A
> >
> > Interested to hear if it's accurate, or just blather - I'm not smart
> enough
> > on this topic to distinguish between the two.
> >
> >
> > ---Roy
> > K3RLD
> > _______________________________________________
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> >
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
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AMSAT-NA.
Not an AMSAT member? Join now to support the amateur satellite program!
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End of AMSAT-BB Digest, Vol 13, Issue 85
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