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CX2SA > SATDIG 15.07.09 00:41l 741 Lines 23055 Bytes #999 (0) @ WW
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Today's Topics:
1. Amsat-UK Oscar News (john heath)
2. Re: Pass predictions and differences in software (Alexandru Csete)
3. Oscar 5 in SatMagazine (Trevor .)
4. Re: G5500 Rotor Drift Issue (i8cvs)
5. Re: Polarity switching question (i8cvs)
6. Re: Polarity switching question (Howard Kowall)
7. Re: For Sale - Assorted Satellite Related Items
(Sion Chow Q. C. (9W2QC))
8. Polarity Switching box (Michael Wolthuis)
9. Falcon-1 Launch - webcast ? (Trevor .)
10. Re: Falcon-1 Launch - webcast ? (Andrew Glasbrenner)
11. Re: Falcon-1 Launch - webcast ? (Alexandru Csete)
12. Re: Falcon-1 Launch - webcast ? (Trevor .)
----------------------------------------------------------------------
Message: 1
Date: Mon, 13 Jul 2009 20:15:14 +0100
From: "john heath" <g7hia@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Amsat-UK Oscar News
To: "amsat" <amsat-bb@xxxxx.xxx>
Message-ID: <D3F0229E59E74C57A788F9C29FCEDC15@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
My copy of O.N. 186 arrived today,
Thanks to Dave Johnson G4DPZ, Graham Shirville G3VZV and all contributors for
a much improved ON.
I well remember how Ron Broadbent used to hustle everyone for contribution
articles, on the basis that as the editor he couldn't produce a good magazine
with out material to work with. Lets see what we can do to support Dave and
Graham in keeping O.N full and interesting
73 John G7HIA
------------------------------
Message: 2
Date: Mon, 13 Jul 2009 21:27:15 +0200
From: Alexandru Csete <alexc@xxxx.xx.xx>
Subject: [amsat-bb] Re: Pass predictions and differences in software
To: amsat-bb@xxxxx.xxx
Message-ID: <20090713212715.73c09ea1@xxxxxxx>
Content-Type: text/plain; charset=UTF-8
Hi LeRoy,
Which version of gpredict are you using? The one that is included with
Ubuntu? That version is very much out of date and did have several bugs
that could affect pass predictions. In particular the "time controller"
function was very immature back then.
Did you try the predict pass functions instead of advancing the clock
(i.e. right click on a satellite)?
73
Alex OZ9AEC
On Mon, 13 Jul 2009 18:27:42 +0000
kd8bxp@xxx.xxx wrote:
> Good afternoon
>
> I am running gpredict on an ubuntu linux box - I am looking at the
> SO50 satellite -
>
> It is currently 1412 (1812utc) - I advanced the clock of the software
> forward by about 3 hrs (1712 local) and see what looks like a great
> pass on screen
>
> I went to verify using the webbased prediction on the amsat website,
> and. Don't see anything in the list of passes even close to what
> gpredict says will happen in the future
>
> I updated the keps thinking maybe they were out day, and got the same
> results
>
> I then fired up my winXP machine and SatPC32 - and got results that
> are closer to what the amsat site says.
>
> When looking at real time, all three show the SO50 in just about the
> same spot
>
> I think I believe the amsat site and satPC32 software.
>
> Not sure of the question to this post - wondering more or less what
> factors effect how the pass predictions work. When they (or at least
> the two I have control over) have updated keps shouldn't they give
> the same information or realitivly close - as I look at the two
> programs running side by side I do see slight differences in where
> SO50 is located on the map currently. But it is only slight and may
> have more to do with the scale of the display maps and not the
> software.
>
> If I advance the time thou I don't get the same results. And this
> confuses me
>
> Thanks,
> LeRoy, KD8BXP
> http://www.HamOhio.com
> Sent on the Now Network? from my Sprint?? BlackBerry
>
------------------------------
Message: 3
Date: Mon, 13 Jul 2009 22:41:44 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Oscar 5 in SatMagazine
To: amsat-bb@xxxxx.xxx
Message-ID: <120192.50594.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
The Oscar 5 satellite built by Australian Radio Amateurs at the end of the
60's is mentioned in the latest issue of SatMagazine
The July/August issue of SatMagazine covers the Australian space program and
mentions the work of Australian Radio Amateurs who built Oscar 5. The article
on page 59 includes a picture of Oscar 5 which carried transmitters on 29.450
MHz and 144.050 MHz and was launched on January 23, 1970, into an orbit of
1435 x 1481 km with an inclination of 102.0 degrees.
Ther July/Aug 2009 issue of SatMagazine is at
http://www.satmagazine.com/2009/SatMag_JulAug09.pdf
SatMagazine
http://www.satmagazine.com/
----
73 Trevor M5AKA
RSS Daily Radio News: http://www.southgatearc.org/
Daily News via Email:
http://www.feedburner.com/fb/a/emailverifySubmit?feedId=2783644&loc=en_US
Submit your news: http://www.southgatearc.org/news/your_news_1.htm
or email editor at southgatearc.org
----
------------------------------
Message: 4
Date: Tue, 14 Jul 2009 02:16:15 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: G5500 Rotor Drift Issue
To: "Mark Spencer" <mspencer@xxxxxx.xxx>, "AMSAT-BB"
<amsat-bb@xxxxx.xxx>
Message-ID: <007c01ca0418$4e0bc1c0$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Mark, WA8SME
Sometime the voltage regulators tends to self-oscillate in a very low but
very wide frequency band.
In this condition the regulated voltage is unstable not clean and dirty as
can be seen using an oscilloscope.
This problem is well know by the microwave people when they try to
get a local oscillator clean and stable.
To eliminate the self-oscillation an effective cure is to put a ceramic
capacitor of 0.1 uF in parallel to an electrolitic capacitor ranging from 1
to 10 uF both at the input and the output of the regulator and check
again with the oscilloscope any trace of oscillations at the regulator
output.
73" de
i8CVS Domenico
----- Original Message -----
From: "Mark Spencer" <mspencer@xxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Monday, July 13, 2009 8:42 PM
Subject: [amsat-bb] G5500 Rotor Drift Issue
> There have been a couple of recent posts about a G5500 voltage drift issue
> and some solutions. I'd like to thank those gentlemen for the posts and
the
> solutions. I am in a unique position to be able to work with nine G5500
> rotors side-by-side in preparation for the Teachers Institute II that I
will
> hold at the end of the week. I noticed the same warm-up/calibration issue
> mentioned in the posts. I discovered that it took on average 10 minutes
of
> warm up time for the voltage to stabilize, and this voltage is the
reference
> on which the antenna position indications are based. The difference
between
> the cold start and warm up position was around 10 degrees for AZ and 4
> degrees for EL. Minor but irritating. I thought I'd try the easiest
> solution suggested first (changing the output cap on the regulator to
.1uF)
> before I tried the more dramatic solution of changing out the voltage
> regulator. I simply tack soldered the .1uF cap on the exposed leads of
the
> existing .01uF cap, and it worked like a charm. All nine rotor
controllers
> fire up at 6.12 volts and hold that voltage throughout the operation of
the
> rotor. This sure will make instruction of rotor setup and calibration a
> heck of a lot easier. Thanks for the suggests.
>
>
>
> Mark Spencer, WA8SME
>
> ARRL-The national association for Amateur Radio
>
> Education and Technology Program Coordinator
>
> mspencer@xxxx.xxx
>
> http://www.arrl.org/FandES/tbp/
>
> 530-495-9150
>
>
>
> _______________________________________________
> 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: 5
Date: Tue, 14 Jul 2009 03:23:28 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Polarity switching question
To: <w6zkh@xxxxxxx.xxx>, "amsat-bb" <amsat-bb@xxxxx.xxx>
Message-ID: <00c801ca0421$b19d7a40$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi John, W6ZKH
The 2 meters KLM antenna uses two crossed folded dipoles wich are spaced 1/4
wavelength in air over the boom so that to get circular polarization no coax
delay lines are necessary.
Each folded dipole has a wounded coax balun with ratio 4/1 wich is made with
1/2 electrical wavelength of 50 ohm coax cable RG 303 to transform the
balanced impedance of 200 ohm of the folded dipole into a 50 ohm unbalanced
impedance at the output of balun.
The phasing harness coming out from the plastic barrel is made with two
maching lines of 75 ohm coax cable type RG 302 and they are both 1/4
electrical wavelenght long.
Each maching line of 75 ohm transforms the 50 ohm impedance of the dipole to
about 100 ohm into the barrel but two 100 ohm in parallel becomes 50 ohm as
seen from the coax line connected to the barrel PL connector and going down
to the shack.
The 75 ohm line connected to the polarization switching relay is also 1/4
electrical wavelenght long but including the electrical lenght of the relay
itself.
To switch polarization from RHCP to LHCP the relay only switches the inner
conductor of it's 75 ohm coax cable from one to the other stud i.e. from
one to the other screw of the same folded dipole.
The 70 cm KLM antenna uses the same basic criteria but to switch
polarization from RHCP to LHCP the relay add to one folded dipole a 1/2
wavelenght delay line wich is included into the aluminum box and is made
with a 50 ohm strip line over a fiberglass printed circuit.
I hope this helps.
73" de
i8CVS Domenico
----- Original Message -----
From: <w6zkh@xxxxxxx.xxx>
To: "amsat-bb" <amsat-bb@xxxxx.xxx>
Sent: Monday, July 13, 2009 4:51 PM
Subject: [amsat-bb] Polarity switching question
> I recently obtained a pair of KLM yagi's for satellite work. They both
have the KLM polarity switching box mounted and wired up. Since I havent put
them up yet, and not well versed in the subject, I got out my ohm meter just
to see what was what on this item. I noticed that both driven elements have
continuty to the center pin of the coax at the same time. I was under the
impression that the relay switched back and forth the driven elements to
give either RH or LH polarity. I havent applied the 12 volts to the box yet
to check that out, but was just curious. One thing I have noticed while
using the downlink yagi is that I get very little fade due to polarity when
I turn the antenna. I hope that is a good thing?? I havent checked the
uplink yagi to see if it has the same results.
>
> I hope someone can enlighten me abit.
>
> 73 de John W6ZKH
>
>
> _______________________________________________
> 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: 6
Date: Mon, 13 Jul 2009 21:11:16 -0500
From: "Howard Kowall" <hkowall@xxxx.xx>
Subject: [amsat-bb] Re: Polarity switching question
To: "amsat-bb" <amsat-bb@xxxxx.xxx>
Message-ID: <004401ca0428$5f047110$6701a8c0@xxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hello to all
You might want to check out this site for the info you may need
http://sv1bsx.50webs.com/antenna-pol/polarization.html
some good info there
thanks all
Howard
VE4ISP
----- Original Message -----
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: <w6zkh@xxxxxxx.xxx>; "amsat-bb" <amsat-bb@xxxxx.xxx>
Sent: Monday, July 13, 2009 8:23 PM
Subject: [amsat-bb] Re: Polarity switching question
> Hi John, W6ZKH
>
> The 2 meters KLM antenna uses two crossed folded dipoles wich are spaced
> 1/4
> wavelength in air over the boom so that to get circular polarization no
> coax
> delay lines are necessary.
> Each folded dipole has a wounded coax balun with ratio 4/1 wich is made
> with
> 1/2 electrical wavelength of 50 ohm coax cable RG 303 to transform the
> balanced impedance of 200 ohm of the folded dipole into a 50 ohm
> unbalanced
> impedance at the output of balun.
> The phasing harness coming out from the plastic barrel is made with two
> maching lines of 75 ohm coax cable type RG 302 and they are both 1/4
> electrical wavelenght long.
> Each maching line of 75 ohm transforms the 50 ohm impedance of the dipole
> to
> about 100 ohm into the barrel but two 100 ohm in parallel becomes 50 ohm
> as
> seen from the coax line connected to the barrel PL connector and going
> down
> to the shack.
> The 75 ohm line connected to the polarization switching relay is also 1/4
> electrical wavelenght long but including the electrical lenght of the
> relay
> itself.
> To switch polarization from RHCP to LHCP the relay only switches the inner
> conductor of it's 75 ohm coax cable from one to the other stud i.e. from
> one to the other screw of the same folded dipole.
>
> The 70 cm KLM antenna uses the same basic criteria but to switch
> polarization from RHCP to LHCP the relay add to one folded dipole a 1/2
> wavelenght delay line wich is included into the aluminum box and is made
> with a 50 ohm strip line over a fiberglass printed circuit.
>
> I hope this helps.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: <w6zkh@xxxxxxx.xxx>
> To: "amsat-bb" <amsat-bb@xxxxx.xxx>
> Sent: Monday, July 13, 2009 4:51 PM
> Subject: [amsat-bb] Polarity switching question
>
>
>> I recently obtained a pair of KLM yagi's for satellite work. They both
> have the KLM polarity switching box mounted and wired up. Since I havent
> put
> them up yet, and not well versed in the subject, I got out my ohm meter
> just
> to see what was what on this item. I noticed that both driven elements
> have
> continuty to the center pin of the coax at the same time. I was under the
> impression that the relay switched back and forth the driven elements to
> give either RH or LH polarity. I havent applied the 12 volts to the box
> yet
> to check that out, but was just curious. One thing I have noticed while
> using the downlink yagi is that I get very little fade due to polarity
> when
> I turn the antenna. I hope that is a good thing?? I havent checked the
> uplink yagi to see if it has the same results.
>>
>> I hope someone can enlighten me abit.
>>
>> 73 de John W6ZKH
>>
>>
>> _______________________________________________
>> 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: 7
Date: Tue, 14 Jul 2009 16:35:20 +0800
From: "Sion Chow Q. C. \(9W2QC\)" <9w2qc@xxxxx.xxx>
Subject: [amsat-bb] Re: For Sale - Assorted Satellite Related Items
To: "'A.J. Farmer'" <farmer.aj@xxxxx.xxx>, "'AMSAT BB'"
<amsat-bb@xxxxx.xxx>
Message-ID: <7A8398F391254FEABFC7CC94E4C3599B@xxxxxxxx.xxxxx>
Content-Type: text/plain; charset="us-ascii"
Hi A. J. Farmer,
Just wondering, is the M2 2MCP22 still available?
Thank you.
73,
Sion Chow Q. C.,
9W2QC / WQ2C.
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of A.J. Farmer
Sent: Monday, 6 July 2009 7:02 AM
To: AMSAT BB
Subject: [amsat-bb] For Sale - Assorted Satellite Related Items
Yaesu G-5500 Az/El Rotator
Includes control box, cables, and manual
Works fine - no problems
$400 or best offer
Labjack Piggyback
Combined with the Labjack U12 (below), allows computer control of the
G-5500 rotator by Nova Satellite Tracking software
http://www.nlsa.com/labjack/labjack_piggyback.html
$20
Labjack U12
http://www.nlsa.com/labjack/labjack_u12.html
$100 or best offer
M2 2MCP22 Circ. Pol. Antenna
http://www.m2inc.com/products/vhf/2m/2mcp22.html
All parts are in excellent condition except some of the element
retaining clips must be broken to disassemble the antenna. These
clips are "one way" only and are impossible to remove once the antenna
is assembled. A bag of 50 replacement clips is available from M2 for
$13, or you can use other techniques instead of the clips.
$200 or best offer
Pickup available from Hollywood, MD or will ship anywhere via UPS at cost.
No reasonable offers refused!
If interested, contact me at farmer.aj@xxxxx.xxx
Thanks!
A.J. Farmer, AJ3U
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 8
Date: Tue, 14 Jul 2009 08:28:47 -0400
From: Michael Wolthuis <mwolthuis@xxxxxxxxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Polarity Switching box
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <C681F23F.7446%mwolthuis@xxxxxxxxxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="ISO-8859-1"
I know I could make my own, but I was just wondering if someone makes a box
that can be easily connected to the polarity switches on a set of UHF/VHF
KLM antennas? I have the red/black leads run down to my shack on some
simple Cat5e, but was hoping for a nice box that would look good sitting
with my rotor control.
I thought KLM used to make one, but can?t find it.
Thanks,
Mike
kb8zgl
------------------------------
Message: 9
Date: Mon, 13 Jul 2009 20:22:19 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Falcon-1 Launch - webcast ?
To: amsat-bb@xxxxx.xxx
Message-ID: <516557.98884.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Does anyone know if there's a live webcast of tomorrows Falcon-1 launch of
CubeSAT and InnoSAT ?
http://atsbgs.blogspot.com/
73 Trevor M5AKA
------------------------------
Message: 10
Date: Tue, 14 Jul 2009 12:32:14 -0400
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Falcon-1 Launch - webcast ?
To: "Trevor ." <m5aka@xxxxx.xx.xx>, <amsat-bb@xxxxx.xxx>
Message-ID: <14A02709C32242CEAFBF21D5BA231C0E@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Falcon-1 Flight 5 launched successfully last night, but CubeSAT and InnoSAT
weren't onboard. SpaceX had to refit the launcher with a vibration dampening
system, and that bumped the two nanosats off the flight.
73, Drew KO4MA
----- Original Message -----
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: <amsat-bb@xxxxx.xxx>
Sent: Monday, July 13, 2009 4:22 PM
Subject: [amsat-bb] Falcon-1 Launch - webcast ?
>
> Does anyone know if there's a live webcast of tomorrows Falcon-1 launch of
> CubeSAT and InnoSAT ?
>
> http://atsbgs.blogspot.com/
>
> 73 Trevor M5AKA
>
>
>
>
>
> _______________________________________________
> 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: Tue, 14 Jul 2009 18:46:40 +0200
From: Alexandru Csete <alexc@xxxx.xx.xx>
Subject: [amsat-bb] Re: Falcon-1 Launch - webcast ?
To: amsat-bb@xxxxx.xxx
Message-ID: <20090714184640.172151vfewccnuk0@xxxxxxx.xxxx.xx.xx>
Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes";
format="flowed"
Webcast of SpaceX launches are usually available on their webstite
http://www.spacex.com/
A recording from this morning (EU) / last night (US) is on YouTube
http://www.youtube.com/watch?v=Mfdk_VZMjQI
73
Alex OZ9AEC
Quoting Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>:
> Falcon-1 Flight 5 launched successfully last night, but CubeSAT and InnoSAT
> weren't onboard. SpaceX had to refit the launcher with a vibration dampening
> system, and that bumped the two nanosats off the flight.
>
> 73, Drew KO4MA
>
> ----- Original Message -----
> From: "Trevor ." <m5aka@xxxxx.xx.xx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Monday, July 13, 2009 4:22 PM
> Subject: [amsat-bb] Falcon-1 Launch - webcast ?
>
>
>>
>> Does anyone know if there's a live webcast of tomorrows Falcon-1 launch of
>> CubeSAT and InnoSAT ?
>>
>> http://atsbgs.blogspot.com/
>>
>> 73 Trevor M5AKA
>>
>>
>>
>>
>>
>> _______________________________________________
>> 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: 12
Date: Tue, 14 Jul 2009 18:29:11 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Re: Falcon-1 Launch - webcast ?
To: amsat-bb@xxxxx.xxx
Message-ID: <636903.39725.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
--- On Tue, 14/7/09, Alexandru Csete <alexc@xxxx.xx.xx> wrote:
> Webcast of SpaceX launches are usually available on their webstite?
Hi Alex, Thanks for the YouTube link.
For some reason my email took a long time, > 12 hours, to get through the
AMSAT-BB and there's an email from early this morning that hasn't come through
yet - the web is probably on a go-slow. Anyway I found the live webcast in
time.
--- On Tue, 14/7/09, Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx> wrote:
> system, and that bumped the two nanosats off the flight.
A shame they got bumped, still the good news is that the Falcon 1 got into
orbit successfully. Lets hope SpaceX have similar success with the Geo-
Transfer orbit capable Falcon 9.
73 Trevor M5AKA
------------------------------
_______________________________________________
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 337
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