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CX2SA > SATDIG 02.12.09 22:07l 713 Lines 24191 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. UO-11 a report (Mineo Wakita)
2. DN70,DN71 trip (Rodney Waln)
3. Re: "Frustration" Solved! (Michael Tondee)
4. Re: "Frustration" Solved! (Greg D.)
5. Re: "Frustration" Solved! (Tony Langdon)
6. Re: Boost To higher Orbits? (Greg D.)
7. Re: "Frustration" Solved! (Greg D.)
8. AO-40 status (John Becker, W?JAB)
9. Re: "Frustration" Solved! (Tony Langdon)
10. Re: AO-40 status (Jeff Yanko)
11. Status DelfiC3 (PE0SAT)
12. AO-51 magnet reversal tonight (Andrew Glasbrenner)
13. Re: AO-40 status (Mateusz)
14. Re: AO-51 magnet reversal tonight (David Wing)
15. Re: AO-40 status (Luc Leblanc)
16. Re: AO-51 magnet reversal tonight (Andrew Glasbrenner)
----------------------------------------------------------------------
Message: 1
Date: Wed, 2 Dec 2009 06:03:06 +0900
From: "Mineo Wakita" <ei7m-wkt@xxxxxxxxx.xx.xx>
Subject: [amsat-bb] UO-11 a report
To: <amsat-bb@xxxxx.xxx>
Message-ID: <B14EE83F141E448888C1CC4B82DCD382@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-2022-jp";
reply-type=original
http://www.ne.jp/asahi/hamradio/je9pel/uo11mixw.htm
JE9PEL, Mineo Wakita
------------------------------
Message: 2
Date: Tue, 1 Dec 2009 15:52:14 -0800 (PST)
From: Rodney Waln <kc0zhf@xxxxx.xxx>
Subject: [amsat-bb] DN70,DN71 trip
To: amsat-bb@xxxxx.xxx
Message-ID: <400384.57400.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
hi, and thank you to all the stations that worked me on my trip to Cheyenne,
Wy
as said before i got there on the 23rd, but had radio problems...ect.
after they were taken care?of and the family stuff was done i was able to
operate DN71 and DN 70,71 on the US 85 hwy Colorado/Wyoming border all be it
a windy day(hope i did not sound to bad).
?
i also had help from a long time friend (N7BAM thank you brian) on the 27th
from DN71
and on the 28th i traveled south to give out the combo,
it was a long trip at least for me and i would have liked to do more
operating from that area in the near future, more info on that later.
?
if you would like a card for contact just e-mail the details and if you send
SASE that would be ok too.
in total 5 passes were worked on the trip and SO-50, AO-27 and AO-51 were
used on the after noon and evening passes.
Rodney
kc0zhf back in DN94??
------------------------------
Message: 3
Date: Tue, 01 Dec 2009 19:14:37 -0500
From: Michael Tondee <mat_62@xxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: "Frustration" Solved!
To: Greg Dober <almetco@xxxxxxx.xxx>
Cc: AMSAT-BB@xxxxx.xxx
Message-ID: <4B15B16D.3080801@xxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Today I pulled a good one. I decided to go ahead and raise the mast up
"temporarily" to see how much it improved the minimum horizon I could
start to copy. I raised the mast and tightened the clamping bolt by
hand. I had a guy wire a bit tight and as I started down the ladder to
adjust it I thought, "You know, I should probably give that clamp bolt a
turn with pliers so it doesn't let lose, Nahhh...it will be alright."
Sure enough, as I'm standing there adjusting the turnbuckle, the bolt
lets lose and antenna, rotators and all telescope back down into the
lower mast section at a high rate of speed. Nothing was harmed but I
ran out of daylight and wasn't able to free the upper mast section to
raise it again. It's jammed at the moment.
Should have listened to myself about tightening that bolt! When we get
in a hurry we make stupid mistakes.
Oh well, there's always tomorrow.
73,
Michael W4HIJ
Greg Dober wrote:
> Michael,
>
> Looking forward to working you and glad the problem is solved. In pre-gray
> hair days, I use to make fun of the TV instructions when the troubleshooting
> section noted: Make sure TV is plugged into outlet. Not anymore!! Just
> yesterday I spent a half hour wondering why my printer didn't print. When
> you remove the wrong ethernet cable earlier in the day and assumed it was
> the correct one for another device...well, you know the rest of the story.
>
> 73
> Greg
> N3MVF
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Michael Tondee
> Sent: Monday, November 30, 2009 6:06 PM
> To: AMSAT-BB@xxxxx.xxx
> Subject: [amsat-bb] "Frustration" Solved!
>
> Well, just got through listening to a pass of AO-51. As several have
> suggested, it was a pointing issue with the antenna.
> I can't believe my memory has gotten to the point where I couldn't
> remember where North was the last time I had the antennas up.
> Thing is, I actually took a compass reading the other day and
> compensated for declination but I must have misread something
> somewhere. I was only about 20 degrees off! Declination here is only 4
> degrees so it couldn't have been that. That's what I get for working on
> stuff at dusk I guess. I'm slightly embarrassed!
> BTW, I didn't mean to make anyone think that an 11 element yagi was
> too narrow for LEO's. It's fine if you point the dang thing right!
> Also, the reason why I went this route with the more complex antenna and
> AZ/EL system is that I already had the stuff on hand from my last foray
> into satellites. Only the preamp was new and I knew that everything had
> worked before. I can certainly appreciate the suggestions on
> simplification and I was about to do just that if I didn't have any
> success today.
> Now I just have to work out some of my cable issues and get something
> going for transmit. My 2 meter "cheap yagi" has seen better days. Once I
> get that, I'll raise the mast and get the antennas up to their normal
> height.
> I'm just using HT's right now but I hope to have a new TS-2000X
> sometime after the first of the year. I've been quite interested in the
> TS-2000 vs. IC910H thread. I know that Icom has discontinued the 910
> because of the 9100 but I was under the impression that Kenwood would
> release a new rig at Dayton this year and wonder if that will mean the
> demise of the TS-2000.
> Thanks everyone for the suggestions and also allowing me to "vent" a
> bit last night.I was getting pretty frustrated.
> 73,
> Michael, W4HIJ
>
>
>
>
>
------------------------------
Message: 4
Date: Tue, 1 Dec 2009 22:06:38 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: "Frustration" Solved!
To: <kl7uw@xxxxxxxxx.xxx>, <rwmcgwier@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <BLU133-W1643D1E8C9CD8F7F068FE7A9950@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
> I smile (in self recognition). An old mentor, when I was starting in
> a career of electronic repair, said "its usually something
> simple"! "Do not automatically look for the worst cause". The first
> step in troubleshooting is to verify all the inputs are present, then
> check the outputs, then back up an look and smell. And by all means
> do not "assume".
>
Amen! We bring our 5 senses with us to our troubleshooting tasks, and then
ignore them to focus on the 6th sense (guesswork!). Use all of them!
(Well, maybe not taste...) Take a step back and watch the lights and
meters. Listen to the sequence of clicks and buzzes (and the lack of them).
Feel the temperature of the chips (the back of your hand is a marvelous
thermometer at a few inches above a circuit). All are clues as to what is
going on.
This garden universe vibrates complete.
Some may get a sound so sweet.
Vibrations reach on up to become light,
And then thru gamma, out of sight.
Between the eyes and ears there lay,
The sounds of colour and the light of a sigh.
And to hear the sun, what a thing to believe.
But it's all around if we could but perceive.
To know ultra-violet, infra-red and X-rays,
Beauty to find in so many ways.
Two notes of the chord, that's our full scope.
But to reach the chord is our life's hope.
And to name the chord is important to some.
So they give a word, and the word is OM.
- The Moody Blues
Greg KO6TH
_________________________________________________________________
Chat with Messenger straight from your Hotmail inbox.
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------------------------------
Message: 5
Date: Wed, 02 Dec 2009 17:45:50 +1100
From: Tony Langdon <vk3jed@xxxxx.xxx>
Subject: [amsat-bb] Re: "Frustration" Solved!
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>, <kl7uw@xxxxxxxxx.xxx>,
<rwmcgwier@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <4b160d2c.0e0bca0a.4a78.2502@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 05:06 PM 12/2/2009, Greg D. wrote:
>Amen! We bring our 5 senses with us to our troubleshooting tasks,
>and then ignore them to focus on the 6th sense (guesswork!). Use
>all of them! (Well, maybe not taste...) Take a step back and watch
>the lights and meters. Listen to the sequence of clicks and buzzes
You've never checked the state of a 9V battery with your tongue? ;)
73 de VK3JED / VK3IRL
http://vkradio.com
------------------------------
Message: 6
Date: Tue, 1 Dec 2009 23:14:11 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Boost To higher Orbits?
To: <vk3jed@xxxxx.xxx>, <rwmcgwier@xxxxx.xxx>, <nss@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BLU133-W212C4B546EEBC6A7630864A9950@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
> Date: Tue, 1 Dec 2009 11:20:45 +1100
> To: rwmcgwier@xxxxx.xxxx nss@xxx.xxx
> From: vk3jed@xxxxx.xxx
> CC: AMSAT-BB@xxxxx.xxx
> Subject: [amsat-bb] Re: Boost To higher Orbits?
>
> At 11:17 PM 11/30/2009, Bob McGwier wrote:
>
> >p=hk where p is momentum, k is Planck's constant, and k is an integer.
> >
> >So when a photon is captured or reflects/scatters, it transfers
> >momentum. This equation is used to determine how much momentum is being
> >transferred.
> >
So, the discussion is about the fundamentally different ways to cause force
to be applied to the satellite.
Most of the time we operate by Newton's 3rd law, throwing parts of the
satellite out one end, with the knowledge that doing so will push the
remaining parts of the bird in the other direction. We call them rockets.
Conservation of Momentum is just another aspect of Newton's 3rd law. Any
time you cause something with mass to move differently, there's always a got
to be a balancing force. Bouncing photons off a sail is only different from
a rocket in that the rocket is shedding parts of itself as it works, while
the photons are external. And a they are lot lighter (no pun intended), so
it takes a whole lot of them to have the same effect, making it less than
practical.
Looking at the other laws of physics we have Bernoulli's principle, where
the increased velocity of a fluid over a curved surface causes a pressure
drop which can push the surface in the direction of the lower pressure. We
call them propellers and lanteen sails. Is there any way to use this
principle with the solar wind? I think that was answered as a theoretical
yes, but a practical no.
So what remains? What about magnetic or electrostatic forces? Friction?
Anything else I missed?
It would sure be nice to be able to propel a satellite without tossing bits
of it overboard.
Greg KO6TH
_________________________________________________________________
Get gifts for them and cashback for you. Try Bing now.
http://www.bing.com/shopping/search?q=xbox+games&scope=cashback&form=MSHYCB&pu
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------------------------------
Message: 7
Date: Tue, 1 Dec 2009 23:23:42 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: "Frustration" Solved!
To: <vk3jed@xxxxx.xxx>, <kl7uw@xxxxxxxxx.xxx>, <rwmcgwier@xxxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Message-ID: <BLU133-W184CEA1FD7944117FD620BA9950@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Actually, I do that all the time!
Greg KO6TH
> Date: Wed, 2 Dec 2009 17:45:50 +1100
> To: ko6th_greg@xxxxxxx.xxxx kl7uw@xxxxxxxxx.xxxx rwmcgwier@xxxxx.xxxx
amsat-bb@xxxxx.xxx
> From: vk3jed@xxxxx.xxx
> Subject: Re: [amsat-bb] Re: "Frustration" Solved!
>
> At 05:06 PM 12/2/2009, Greg D. wrote:
>
> >Amen! We bring our 5 senses with us to our troubleshooting tasks,
> >and then ignore them to focus on the 6th sense (guesswork!). Use
> >all of them! (Well, maybe not taste...) Take a step back and watch
> >the lights and meters. Listen to the sequence of clicks and buzzes
>
> You've never checked the state of a 9V battery with your tongue? ;)
>
> 73 de VK3JED / VK3IRL
> http://vkradio.com
>
_________________________________________________________________
Chat with Messenger straight from your Hotmail inbox.
http://www.microsoft.com/windows/windowslive/hotmail_bl1/hotmail_bl1.aspx?ocid
=PID23879::T:WLMTAGL:ON:WL:en-ww:WM_IMHM_4:092009
------------------------------
Message: 8
Date: Tue, 01 Dec 2009 11:32:42 -0600
From: "John Becker, W?JAB" <w0jab@xxxxxxxxx.xxx>
Subject: [amsat-bb] AO-40 status
To: amsat-bb@xxxxx.xxx
Message-ID: <5.2.0.9.2.20091201113231.02c38250@xxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Is there any thing going on with AO-40 such as a change
in it's status?
It sure was fun working it.
John, W0JAB
------------------------------
Message: 9
Date: Wed, 02 Dec 2009 18:28:08 +1100
From: Tony Langdon <vk3jed@xxxxx.xxx>
Subject: [amsat-bb] Re: "Frustration" Solved!
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>, <kl7uw@xxxxxxxxx.xxx>,
<rwmcgwier@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <4b161715.0f0bca0a.2820.298a@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 06:23 PM 12/2/2009, Greg D. wrote:
>Actually, I do that all the time!
> > You've never checked the state of a 9V battery with your tongue? ;)
I rest my case, and you were right, use all 5 senses. ;)
73 de VK3JED / VK3IRL
http://vkradio.com
------------------------------
Message: 10
Date: Tue, 1 Dec 2009 23:50:54 -0800
From: "Jeff Yanko" <wb3jfs@xxx.xxx>
Subject: [amsat-bb] Re: AO-40 status
To: <amsat-bb@xxxxx.xxx>, "John Becker, W?JAB" <w0jab@xxxxxxxxx.xxx>
Message-ID: <A9B70F6CAADF42D3BD783582C232C642@xxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi John,
I would say it's pretty much dead. It's just the fact nobody wants to play
taps. Many, including myself, would just love to have it magically
re-appear and work like nothing ever happened. Unfortunately, I don't see
this occuring. I can't seem to recall if there ever was an "official
bulletin" indicating that AO-40 is indeed dead. If it hasn't, it should be,
so we can focus on current and future projects.
73,
Jeff WB3JFS
----- Original Message -----
From: ""John Becker, W?JAB"" <w0jab@xxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Tuesday, December 01, 2009 9:32 AM
Subject: [amsat-bb] AO-40 status
> Is there any thing going on with AO-40 such as a change
> in it's status?
>
> It sure was fun working it.
>
> John, W0JAB
>
>
> _______________________________________________
> 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, 2 Dec 2009 17:23:32 +0100
From: "PE0SAT" <pe0sat@xxxxx.xx>
Subject: [amsat-bb] Status DelfiC3
To: amsat-bb@xxxxx.xxx
Message-ID: <20091202162332.84B7123086@xx.xxxxx.xx>
Content-Type: text/plain;charset=iso-8859-1
Hi All,
I haven't heard DelfiC3 for quite a while, other amateurs have other
experience this last weeks ?
73's PE0SAT
------------------------------
Message: 12
Date: Wed, 02 Dec 2009 11:36:29 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] AO-51 magnet reversal tonight
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <4B16978D.2090708@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On the 2242UTC pass of AO-51 tonight, we will try for the first time to
reverse the magnet and "flip" the orientation of the satellite. While we
do this, the 435.300 transmitter will be shut off for about 10 minutes.
If the reversal is successful, we should see some changes in signal
levels and patterns. This particular maneuver has not attempted since
launch.
I'd appreciate any signal reports or observations from this evening and
the next few days be emailed to ao51-modes@xxxxx.xxx or ko4ma@xxxxx.xxx.
In related news, as the spacecraft spin inexplicably continues to slow,
we are seeing increasingly larger dips in the spacecraft voltage when
the panels are poorly aligned to the sun. The immediate result of this
is that we have had to decrease the power on both transmitters to
prevent discharging the batteries too deeply. We'll be working on
mitigating strategies this coming month. This may include using existing
software routines to automatically lower the downlink power during these
dips in power production, or resolving to run one transmitter at a time
instead of simultaneous digital and repeater downlinks.
73, Drew KO4MA
AMSAT-NA VP Operations
------------------------------
Message: 13
Date: Wed, 2 Dec 2009 17:54:50 +0100
From: "Mateusz" <sq7dqx@xxxxxx.xxxx.xx>
Subject: [amsat-bb] Re: AO-40 status
To: <amsat-bb@xxxxx.xxx>
Message-ID: <EBE30113D7564D3F93554AAD5B8237DA@xx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
----- Original Message -----
From: "Jeff Yanko" <wb3jfs@xxx.xxx>
To: <>; ""John Becker, W?JAB"" <w0jab@xxxxxxxxx.xxx>
Sent: Wednesday, December 02, 2009 8:50 AM
Subject: [amsat-bb] Re: AO-40 status
CUT
-----------------
Lets look at AO-7
Old technology still works except period of time (long ...) when chemical
battery was short circuit.
I think that new projects were and are too complicated. Too many devices in
limited space of space-craft, too many experiments.
Maybe if more attention has been focused on critical parts ... sorry I am
not an expert but it is my opinion - simpler but more heavy duty, more
resistant on high overload during lift.
Matt SQ7DQX
------------------------------
Message: 14
Date: Wed, 2 Dec 2009 08:53:46 -0800
From: "David Wing" <david@xxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 magnet reversal tonight
To: "'Andrew Glasbrenner'" <glasbrenner@xxxxxxxxxx.xxx>, "'Amsat-BB'"
<amsat-bb@xxxxx.xxx>
Message-ID: <55CCD5310C5C4392B8C75DC5C49C2B9F@xxxxx>
Content-Type: text/plain; charset="us-ascii"
Drew,
When you say "flip the orientation of the satellite", do you mean a physical
change of the orientation or are you referring to some other orientation
that is not necessarily a physical change (maybe a change in the RF
polarization or something like that).
Is this being done in an attempt to mitigate the impact of the decreasing
rate of spin?
73
David
K6CDW
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Andrew Glasbrenner
Sent: Wednesday, December 02, 2009 8:36 AM
To: Amsat-BB
Subject: [amsat-bb] AO-51 magnet reversal tonight
On the 2242UTC pass of AO-51 tonight, we will try for the first time to
reverse the magnet and "flip" the orientation of the satellite. While we
do this, the 435.300 transmitter will be shut off for about 10 minutes.
If the reversal is successful, we should see some changes in signal
levels and patterns. This particular maneuver has not attempted since
launch.
I'd appreciate any signal reports or observations from this evening and
the next few days be emailed to ao51-modes@xxxxx.xxx or ko4ma@xxxxx.xxx.
In related news, as the spacecraft spin inexplicably continues to slow,
we are seeing increasingly larger dips in the spacecraft voltage when
the panels are poorly aligned to the sun. The immediate result of this
is that we have had to decrease the power on both transmitters to
prevent discharging the batteries too deeply. We'll be working on
mitigating strategies this coming month. This may include using existing
software routines to automatically lower the downlink power during these
dips in power production, or resolving to run one transmitter at a time
instead of simultaneous digital and repeater downlinks.
73, Drew KO4MA
AMSAT-NA VP Operations
_______________________________________________
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: 15
Date: Wed, 02 Dec 2009 10:46:40 -0500
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] Re: AO-40 status
To: amsat-bb@xxxxx.xxx
Cc: eu-amsat@xxxxxxxxxxx.xxx
Message-ID: <4B164590.20233.113AD6C@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1
On 1 Dec 2009 at 23:50, Jeff Yanko wrote:
> Hi John,
>
> I would say it's pretty much dead. It's just the fact nobody wants to play
> taps. Many, including myself, would just love to have it magically
> re-appear and work like nothing ever happened. Unfortunately, I don't see
> this occuring. I can't seem to recall if there ever was an "official
> bulletin" indicating that AO-40 is indeed dead. If it hasn't, it should be,
> so we can focus on current and future projects.
>
>
> 73,
>
>
> Jeff WB3JFS
>
>
>
> ----- Original Message -----
> From: ""John Becker, W?JAB"" <w0jab@xxxxxxxxx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Tuesday, December 01, 2009 9:32 AM
> Subject: [amsat-bb] AO-40 status
>
>
> > Is there any thing going on with AO-40 such as a change
> > in it's status?
> >
> > It sure was fun working it.
> >
> > John, W0JAB
Is it possible to have the next satellite battery system wired in a way to
bypass the batteries bank in the event of a failure of one cell
or multiples cells? This bypass will let the solar panel power flowing
directly to the sat equipment. If such a system was feasible could
be AO-40 will be with us today? just note i wrote "could be"
DSTAR in Europe (UK)
I see plans afoot to allocate the top end of 144 MHz in the United Kingdom
for GMSK (DV) linking (DSTAR) just hope it will not mixed up
with satellite band plan.
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 16
Date: Wed, 02 Dec 2009 12:05:03 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 magnet reversal tonight
To: David Wing <david@xxxxxx.xxx>
Cc: 'Amsat-BB' <amsat-bb@xxxxx.xxx>
Message-ID: <4B169E3F.90101@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
David Wing wrote:
> Drew,
>
> When you say "flip the orientation of the satellite", do you mean a physical
> change of the orientation or are you referring to some other orientation
> that is not necessarily a physical change (maybe a change in the RF
> polarization or something like that).
>
It will be a physical reorientation of the spacecraft. There is a large
reversible bar magnet that causes the spacecraft to align it's self to
the the magnetic field of the planet, and we are going to remagnetize it
in the opposite sense. Take a look at
http://www.coloradosatellite.com/Papers/Motion.html, especially Figure
2, for a far better explanation than I can give.
> Is this being done in an attempt to mitigate the impact of the decreasing
> rate of spin?
>
No, it's more finally testing the hardware experiment that was included
over five years ago on AO-51. It may or may not have some effect on the
spin. It'll be interesting to see!
73, Drew KO4MA
------------------------------
_______________________________________________
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 4, Issue 639
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