| |
CX2SA > SATDIG 17.06.16 20:21l 809 Lines 29759 Bytes #999 (0) @ WW
BID : AMSATBB11195
Read: GUEST
Subj: AMSAT-BB-digest V11 195
Path: IW8PGT<IZ3LSV<DB0ERF<OK0NAG<OK0PBR<OK2PEN<CX2SA
Sent: 160617/1803Z @:CX2SA.SAL.URY.SOAM #:46217 [Salto] FBB7.00e $:AMSATBB11195
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Only Half of the CubeSats Deployed into Space Work
(Graham Shirville)
2. Re: Only Half of the CubeSats Deployed into Space Work
(skristof@xxxxxxx.xxxx
3. Re: Only Half of the CubeSats Deployed into Space Work
(skristof@xxxxxxx.xxxx
4. Re: Only Half of the CubeSats Deployed into Space Work
(Gaston Bertels)
5. Re: Only Half of the CubeSats Deployed into Space Work (M5AKA)
6. Re: RTL-SDR downlink (Greg Van Scott)
7. Re: RTL-SDR downlink (Patrick STODDARD (WD9EWK/VA7EWK))
8. Re: Only Half of the CubeSats Deployed into Space Work
(John Brier)
9. Re: Only Half of the CubeSats Deployed into Space Work
(Clayton W5PFG)
10. Re: "Only Half of the CubeSats Deployed into Space Work"
(Robert McGwier)
11. Re: RTL-SDR downlink (Robert McGwier)
----------------------------------------------------------------------
Message: 1
Date: Fri, 17 Jun 2016 09:01:13 +0100
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "Daniel Schultz" <n8fgv@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Only Half of the CubeSats Deployed into Space
Work
Message-ID: <14738557DE3B4623BA36BAB75A6BAF07@xxxxxxx.xxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Dan
Many thanks for the link. It certainly makes interesting reading...at the
bottom of his database is a further link to his 2016 presentation
https://sites.google.com/a/slu.edu/swartwout/swartwout_cubesat_workshop_201604
20.pdf?attredirects=0 that you mention.
Can we, collectively, come up with a better name than "Hobbyists" that he
shows in slide 3?
73
Graham
G3VZV
-----Original Message-----
From: Daniel Schultz
Sent: Friday, June 17, 2016 2:55 AM
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Only Half of the CubeSats Deployed into Space Work
I just attended a talk on Tuesday by professor Michael Swartwout of Saint
Louis University. He maintains a database of all known Cubesats at:
https://sites.google.com/a/slu.edu/swartwout/home/cubesat-database
According to his most recent data, about 25% of recent Cubesats are dead on
arrival in orbit, and another 12% fail early in the mission. 50% of Cubesats
are classified as fully or partially successful. He attributes this mostly to
inexperienced organizations building their first satellite with little
understanding of the space environment and little or no environmental testing
before launch. A certain amount of first timer "we know everything" arrogance
also factors into that statistic. Satellites in space definitely don't work
the same as satellites on the workbench. Many of these "one and done"
organizations quit building satellites after their first failure, those
organizations that launch multiple Cubesats have much better success rates.
Experience does count for something.
Even for tiny little Cubesats, there is a set of "best practices" that you
need to pay attention to when building your satellite. If it is your
organization's first satellite, you need to be mindful of what you don't know
and try to learn from the experience of others.
Slides from an earlier presentation by Professor Swartwout are at:
http://nepp.nasa.gov/workshops/eeesmallmissions/talks/11%20-%20THU/1300%20-%20
swartwout%20eee%20201409%20v2.pdf
I expect that this year's presentation will be posted online in a few days.
Dan Schultz N8FGV
------------Original Message------------
Date: Thu, 16 Jun 2016 18:54:05 +0000 (UTC)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] "Only Half of the CubeSats Deployed into Space
Work"
Message-ID:
<528856269.7643560.1466103245274.JavaMail.yahoo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
ARRL story quotes NASA engineer Joe Pellegrino as saying "Only Half of the
CubeSats Deployed into Space Work" - is the failure rate really that
high?http://www.arrl.org/news/view/stmsat-1-youngsters-told-only-half-of-the-c
ub
esats-deployed-into-space-work
I've certainly noticed that a number of ISS deployed CubeSats using amateur
frequencies which were subject to delays in the initial launch and then more
delays before actual deployment have failed but it certainly didn't seem to
be
as high as 50%
But most ISS CubeSat deployments are not on amateur frequencies e.g. over 100
Planet Labs Dove CubeSats have been deployed. Was the NASA engineer saying
that
half of Planet Labs satellites failed to work?
73 Trevor M5AKA
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. 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: Fri, 17 Jun 2016 09:17:29 -0400
From: skristof@xxxxxxx.xxx
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Only Half of the CubeSats Deployed into Space
Work
Message-ID: <12cd31813014885c386fe1b04cb94882@xxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
Please give the reference for "the claimed 50% of those CubeSats
actually Deployed in space don't work".
Steve AI9IN
On 2016-06-17 03:44, M5AKA via AMSAT-BB wrote:
> Thanks,
>
> The figures from the chart show 14.8% of CubeSats fail to work on
Deployment and 8% cease working shortly after Deployment.
>
> A long way from the claimed 50% of those CubeSats actually Deployed in
space don't work.
> 73 Trevor M5AKA
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: Fri, 17 Jun 2016 09:28:26 -0400
From: skristof@xxxxxxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Only Half of the CubeSats Deployed into Space
Work
Message-ID: <c0216cf02df69378d00707bd1ffea94e@xxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
What is the problem with using the term "hobbyist"? Amateur radio is a
hobby. Nothing wrong with that.
A person may take his/her hobby so seriously that they neglect work,
friends, and family, but if you're not getting paid for it, it's still a
hobby.
Hobbyists can still do good work in their field of interest. Amateur
astronomers (hobbyists) are making significant contributions to
astronomical knowledge all the time.
Check out hamsci.org to see how amateur radio hobbyists can help with
ionospheric science.
Steve AI9IN
On 2016-06-17 04:01, Graham Shirville wrote:
> Hi Dan
>
> Many thanks for the link. It certainly makes interesting reading...at the
bottom of his database is a further link to his 2016 presentation
https://sites.google.com/a/slu.edu/swartwout/swartwout_cubesat_workshop_201604
20.pdf?attredirects=0 that you mention.
>
> Can we, collectively, come up with a better name than "Hobbyists" that he
shows in slide 3?
>
> 73
>
> Graham
> G3VZV
>
> -----Original Message-----
> From: Daniel Schultz
> Sent: Friday, June 17, 2016 2:55 AM
> To: amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Only Half of the CubeSats Deployed into Space Work
>
> I just attended a talk on Tuesday by professor Michael Swartwout of Saint
> Louis University. He maintains a database of all known Cubesats at:
> https://sites.google.com/a/slu.edu/swartwout/home/cubesat-database
>
> According to his most recent data, about 25% of recent Cubesats are dead on
> arrival in orbit, and another 12% fail early in the mission. 50% of Cubesats
> are classified as fully or partially successful. He attributes this mostly
to
> inexperienced organizations building their first satellite with little
> understanding of the space environment and little or no environmental
testing
> before launch. A certain amount of first timer "we know everything"
arrogance
> also factors into that statistic. Satellites in space definitely don't work
> the same as satellites on the workbench. Many of these "one and done"
> organizations quit building satellites after their first failure, those
> organizations that launch multiple Cubesats have much better success rates.
> Experience does count for something.
>
> Even for tiny little Cubesats, there is a set of "best practices" that you
> need to pay attention to when building your satellite. If it is your
> organization's first satellite, you need to be mindful of what you don't
know
> and try to learn from the experience of others.
>
> Slides from an earlier presentation by Professor Swartwout are at:
>
http://nepp.nasa.gov/workshops/eeesmallmissions/talks/11%20-%20THU/1300%20-%20
swartwout%20eee%20201409%20v2.pdf
>
> I expect that this year's presentation will be posted online in a few days.
>
> Dan Schultz N8FGV
>
> ------------Original Message------------
> Date: Thu, 16 Jun 2016 18:54:05 +0000 (UTC)
> From: M5AKA <m5aka@xxxxx.xx.xx>
> To: AMSAT BB <amsat-bb@xxxxx.xxx>
> Subject: [amsat-bb] "Only Half of the CubeSats Deployed into Space
> Work"
> Message-ID:
> <528856269.7643560.1466103245274.JavaMail.yahoo@xxxx.xxxxx.xxx>
> Content-Type: text/plain; charset=UTF-8
>
> ARRL story quotes NASA engineer Joe Pellegrino as saying "Only Half of the
> CubeSats Deployed into Space Work" - is the failure rate really that
>
high?http://www.arrl.org/news/view/stmsat-1-youngsters-told-only-half-of-the-c
ub
> esats-deployed-into-space-work
>
> I've certainly noticed that a number of ISS deployed CubeSats using amateur
> frequencies which were subject to delays in the initial launch and then more
> delays before actual deployment have failed but it certainly didn't seem to
> be
> as high as 50%
>
> But most ISS CubeSat deployments are not on amateur frequencies e.g. over
100
> Planet Labs Dove CubeSats have been deployed. Was the NASA engineer saying
> that
> half of Planet Labs satellites failed to work?
>
> 73 Trevor M5AKA
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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@xxxxx.xxx. 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: Fri, 17 Jun 2016 15:58:34 +0000
From: "Gaston Bertels" <gaston.bertels@xxxxxx.xx>
To: skristof@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Only Half of the CubeSats Deployed into Space
Work
Message-ID: <em33c5fec3-f539-4b80-8474-e8372ed703ee@xxxxx>
Content-Type: text/plain; format=flowed; charset=utf-8
"Hobbyists" is correct, but often negatively connoted.
"Radio experimenters" describes what we do, be it DX-ing or building
satellites.
Gaston ON4WF
------ Message d'origine ------
De : skristof@xxxxxxx.xxx
? : amsat-bb@xxxxx.xxx
Envoy? 17-06-16 13:28:26
Objet : Re: [amsat-bb] Only Half of the CubeSats Deployed into Space
Work
>What is the problem with using the term "hobbyist"? Amateur radio is a
>hobby. Nothing wrong with that.
>
>A person may take his/her hobby so seriously that they neglect work,
>friends, and family, but if you're not getting paid for it, it's still
>a
>hobby.
>
>Hobbyists can still do good work in their field of interest. Amateur
>astronomers (hobbyists) are making significant contributions to
>astronomical knowledge all the time.
>
>Check out hamsci.org to see how amateur radio hobbyists can help with
>ionospheric science.
>
>Steve AI9IN
>
>On 2016-06-17 04:01, Graham Shirville wrote:
>
>> Hi Dan
>>
>> Many thanks for the link. It certainly makes interesting reading...at
>>the bottom of his database is a further link to his 2016 presentation
>>https://sites.google.com/a/slu.edu/swartwout/swartwout_cubesat_workshop_2016
0420.pdf?attredirects=0
>>that you mention.
>>
>> Can we, collectively, come up with a better name than "Hobbyists"
>>that he shows in slide 3?
>>
>> 73
>>
>> Graham
>> G3VZV
>>
>> -----Original Message-----
>> From: Daniel Schultz
>> Sent: Friday, June 17, 2016 2:55 AM
>> To: amsat-bb@xxxxx.xxx
>> Subject: Re: [amsat-bb] Only Half of the CubeSats Deployed into Space
>>Work
>>
>> I just attended a talk on Tuesday by professor Michael Swartwout of
>>Saint
>> Louis University. He maintains a database of all known Cubesats at:
>> https://sites.google.com/a/slu.edu/swartwout/home/cubesat-database
>>
>> According to his most recent data, about 25% of recent Cubesats are
>>dead on
>> arrival in orbit, and another 12% fail early in the mission. 50% of
>>Cubesats
>> are classified as fully or partially successful. He attributes this
>>mostly to
>> inexperienced organizations building their first satellite with
>>little
>> understanding of the space environment and little or no environmental
>>testing
>> before launch. A certain amount of first timer "we know everything"
>>arrogance
>> also factors into that statistic. Satellites in space definitely
>>don't work
>> the same as satellites on the workbench. Many of these "one and done"
>> organizations quit building satellites after their first failure,
>>those
>> organizations that launch multiple Cubesats have much better success
>>rates.
>> Experience does count for something.
>>
>> Even for tiny little Cubesats, there is a set of "best practices"
>>that you
>> need to pay attention to when building your satellite. If it is your
>> organization's first satellite, you need to be mindful of what you
>>don't know
>> and try to learn from the experience of others.
>>
>> Slides from an earlier presentation by Professor Swartwout are at:
>>
>>http://nepp.nasa.gov/workshops/eeesmallmissions/talks/11%20-%20THU/1300%20-%
20swartwout%20eee%20201409%20v2.pdf
>>
>> I expect that this year's presentation will be posted online in a few
>>days.
>>
>> Dan Schultz N8FGV
>>
>> ------------Original Message------------
>> Date: Thu, 16 Jun 2016 18:54:05 +0000 (UTC)
>> From: M5AKA <m5aka@xxxxx.xx.xx>
>> To: AMSAT BB <amsat-bb@xxxxx.xxx>
>> Subject: [amsat-bb] "Only Half of the CubeSats Deployed into Space
>> Work"
>> Message-ID:
>> <528856269.7643560.1466103245274.JavaMail.yahoo@xxxx.xxxxx.xxx>
>> Content-Type: text/plain; charset=UTF-8
>>
>> ARRL story quotes NASA engineer Joe Pellegrino as saying "Only Half
>>of the
>> CubeSats Deployed into Space Work" - is the failure rate really that
>>
>>high?http://www.arrl.org/news/view/stmsat-1-youngsters-told-only-half-of-the
-cub
>> esats-deployed-into-space-work
>>
>> I've certainly noticed that a number of ISS deployed CubeSats using
>>amateur
>> frequencies which were subject to delays in the initial launch and
>>then more
>> delays before actual deployment have failed but it certainly didn't
>>seem to
>> be
>> as high as 50%
>>
>> But most ISS CubeSat deployments are not on amateur frequencies e.g.
>>over 100
>> Planet Labs Dove CubeSats have been deployed. Was the NASA engineer
>>saying
>> that
>> half of Planet Labs satellites failed to work?
>>
>> 73 Trevor M5AKA
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. 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@xxxxx.xxx. 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@xxxxx.xxx. 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: 5
Date: Fri, 17 Jun 2016 13:59:29 +0000 (UTC)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: "skristof@xxxxxxx.xxxx <skristof@xxxxxxx.xxx>, AMSAT BB
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Only Half of the CubeSats Deployed into Space
Work
Message-ID:
<1790478911.8427855.1466171969266.JavaMail.yahoo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
> Please give the reference for "the claimed 50% of those CubeSats actually
Deployed in space don't work".
ARRL story
http://www.arrl.org/news/stmsat-1-youngsters-told-only-half-of-the-cubesats-de
ployed-into-space-work
Joe Pellegrino STMSAT-1 Mission Manager
https://drive.google.com/file/d/0B1wUmAxZJJoMUElNLWQyYktCcHc/view
73 Trevor M5AKA
On Friday, 17 June 2016, 14:17, "skristof@xxxxxxx.xxxx
<skristof@xxxxxxx.xxx> wrote:
Please give the reference for "the claimed 50% of those CubeSats
actually Deployed in space don't work".
Steve AI9IN
On 2016-06-17 03:44, M5AKA via AMSAT-BB wrote:
> Thanks,
>
> The figures from the chart show 14.8% of CubeSats fail to work on
Deployment and 8% cease working shortly after Deployment.
>
> A long way from the claimed 50% of those CubeSats actually Deployed in
space don't work.
> 73 Trevor M5AKA
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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@xxxxx.xxx. 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: Fri, 17 Jun 2016 10:16:10 -0400
From: Greg Van Scott <gregv@xxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] RTL-SDR downlink
Message-ID: <4CCE1C7D-8DCE-4714-906D-B6698EA85B69@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Thanks for all the comments and suggestions. I figured a bunch had to have
tried the same thing as me! I have noted pretty much all of the drawbacks
already mentioned (poor supression of strong signals?uplink wiping out
downlink receiver etc.) Thankfully I am not in an RF rich environment, so I
am going to continue to mess around and try some options. I have to say,
for a modest investment there are a lot of really good applications for this
little receiver. Nice way to experiment anyway. Mine has the upconverter
in it so I have HF/VHF/UHF. Really handy little tool. If nothing else I
can have a visual on where the signals are during a satellite pass or can
decode telemetry. Thanks for all the input. This is what I love about
amateur radio! Lots of really smart people out there that are willing to
lend a hand.
Greg WZ2N
------------------------------
Message: 7
Date: Fri, 17 Jun 2016 16:16:36 +0000
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] RTL-SDR downlink
Message-ID:
<CAN6TEUcjidBMm8FqWm=H6S9Em5fSD1e3AoyN+EREN=vsNHndDg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Hello, Ed!
Thanks for your reply! If I had my satellite station in a proper ham
shack, where the radios are inside and antennas are outside (or
the antennas are not within a few feet or a couple of meters of
the radios), it is possible that the house or building may be enough
to keep the transmitter from affecting the RTL-SDR dongles.
I don't have that option for working satellites, even when I am at
home. My antenna is always within a few feet or a couple of meters
of my radios, both transmit and receive. Putting the dongle in
a case with some shielding, and maybe adding some filters in front
of the dongle, could make that work in my situation. Between the
time and money needed to do that, I think I'm doing fine when I use
a FUNcube Dongle Pro+ or SDRplay. In fact, whenever I move to a place
where I can install a proper satellite station in the house,
with antennas outside and the radios inside, I know my existing
SDR receivers (FUNcube Dongle Pro+ and SDRplay) should work fine
in that environment as they have when I've worked portable.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
Twitter: @xxxxxx
On Thu, Jun 16, 2016 at 11:08 PM, Eduardo PY2RN <py2rn@xxxx.xxx> wrote:
> The cheap RTL dongles are as much sensible (or more) than the others more
> expensive.Lack of filtering is the big issue although there are some
> practical and easy workarounds to improve it.For ham satellites downlink
> frequency stability should not be an big issue, there are some models
> already been sold with 0.5PPM TCXO option which are still cheap.It is a
> great opportunity to operate full-duplex on amateur satellites with very
> low investment and improving operational capabilities.
> EME (Moon bounce) audible signal RX comparison between TS-2000 / RTL /
> FunCube Pro+ can be seen here:
> https://youtu.be/3OxyO5ylwfs
>
> 73
> ED PY2RN
>
------------------------------
Message: 8
Date: Fri, 17 Jun 2016 12:18:12 -0400
From: John Brier <johnbrier@xxxxx.xxx>
To: Steve Kristoff <skristof@xxxxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Only Half of the CubeSats Deployed into Space
Work
Message-ID:
<CALn0fKPFMK85jPMmxG6P_vZaBcFn1HD+eSOBiEbBtNuPb2uvrQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charseflowed
I've enjoyed watching some of the news published about STMSat-1. There
was some false hope about it being off frequency (by 500 kHz!,) some
story of "rebooting the satellite," and a lack of command and control
capability. I attribute this to some of their social media posters not
actually vetting their content with the project's technical champion(s).
Thankfully the children of the STM School have been able to learn a
great deal from this project and its sponsors deserve kudos.
In general, many of the amateur or CubeSat projects don't have much
Public Relations scope beyond a webpage or Facebook. Some groups are
starting to get into Twitter. Having a presence in social media or on
the web is great. However, if you don't have an educated representative
posting or at minimum reviewing content, the followers grow weary and
start to question things. This leads to a negative PR fiasco.
It is nice to see more groups posting updates on their respective
project pages and social media. Anything done to promote the hobby and
bolster amateur experimentation is a win for the AMSAT community.
73
Clayton
W5PFG
On 6/17/2016 08:59, M5AKA via AMSAT-BB wrote:
> ARRL story
http://www.arrl.org/news/stmsat-1-youngsters-told-only-half-of-the-cubesats-de
ployed-into-space-work
> Joe Pellegrino STMSAT-1 Mission Manager
https://drive.google.com/file/d/0B1wUmAxZJJoMUElNLWQyYktCcHc/view
>
> 73 Trevor M5AKA
------------------------------
Message: 10
Date: Fri, 17 Jun 2016 13:59:00 -0400
From: Robert McGwier <rwmcgwier@xxxxx.xxx>
To: Cass Hussmann <cass.hussmann@xxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] "Only Half of the CubeSats Deployed into Space
Work"
Message-ID:
<CA+K5gze8zzT8HgufW_rinUszSSzBta51r65-ZAgrbakpE0J9uw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Excellent page. Notice the number of commercial cubesats exploding....
On Thu, Jun 16, 2016 at 8:04 PM, Cass Hussmann <cass.hussmann@xxxxx.xxx>
wrote:
> Cubesat plots setup by M. Swartwout has some good information regarding the
> historical success rate of cube satellites. the number was likely refering
> to cube satellites in general not OSCARs specifically.
>
> https://sites.google.com/a/slu.edu/swartwout/home/cubesat-database
> <https://sites.google.com/a/slu.edu/swartwout/home/cubesat-database>
>
> On Thu, Jun 16, 2016 at 11:54 AM, M5AKA via AMSAT-BB <amsat-bb@xxxxx.xxx>
> wrote:
>
> > ARRL story quotes NASA engineer Joe Pellegrino as saying "Only Half of
> the
> > CubeSats Deployed into Space Work" - is the failure rate really that
> high?
> >
>
http://www.arrl.org/news/view/stmsat-1-youngsters-told-only-half-of-the-cubesa
ts-deployed-into-space-work
> >
> > I've certainly noticed that a number of ISS deployed CubeSats using
> > amateur frequencies which were subject to delays in the initial launch
> and
> > then more delays before actual deployment have failed but it certainly
> > didn't seem to be as high as 50%
> >
> > But most ISS CubeSat deployments are not on amateur frequencies e.g. over
> > 100 Planet Labs Dove CubeSats have been deployed. Was the NASA engineer
> > saying that half of Planet Labs satellites failed to work?
> >
> > 73 Trevor M5AKA
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. 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
> >
>
>
>
> --
> Cass Hussmann, BENG
> *Chief Engineer*
> *UVic ECOSat Team*
> ecosat.ca
> Tel: 778-410-2414 (ext 1001)
> Personal Tel: 778-679-6695
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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:e transponders. I have no problem receiving FM
> > repeaters and simplex and have monitored a few SO50 passes with it no
> > problem, but for some reason I’m not hearing the same signals I can
> > hear on the receiver of my FT100 with the EXACT same antenna. I A/B them
> > and have nothing on the SDR. Is anyone using one of these? I am probably
> > missing something simple. When I started receiving HF I couldn’t
> make
> > it work until I figured out I had
> > to change the sampeling in the setup to direct from
> > quadrature…only learned that through a forum and I assume
> something
> > like that will make the thing come to life. Lack of documentation on some
> > of these things is kind of a pain. Thanks in advance for any help you can
> > offer and my apologies to anyone I have frustrated working half duplex! I
> > will figure out what I’m doing!
> > ____________________________________________________________
> >
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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. (K4KDJ)
Director of AMSAT
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@xxxxx.xxx.
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 member? Join now to support the amateur satellite program!
http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 11, Issue 195
*****************************************
Read previous mail | Read next mail
| |
