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CX2SA > SATDIG 06.09.12 20:03l 309 Lines 12429 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V7 288
Path: IZ3LSV<IK2XDE<ON4HU<CX2SA
Sent: 120906/1902Z @:CX2SA.SAL.URY.SA #:1067 [Salto] FBB7.00e $:AMSATBB7288
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: AO40 replacement !!! (Trevor .)
2. TechEdSat - Iridium and Orbcomm? (Trevor .)
3. Homemade Satellites in Bloomberg Businessweek (Trevor .)
4. Re: satellite activity and future sats... (Thomas Doyle)
5. Fw: Digital Slow Scan in space (Graham Shirville)
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Message: 1
Date: Thu, 6 Sep 2012 08:46:01 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: Gordon JC Pearce <gordonjcp@xxxx.xxx>, Diane Bruce <db@xx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO40 replacement !!!
Message-ID:
<1346917561.40784.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
--- On Wed, 5/9/12, Diane Bruce <db@xx.xxx> wrote:
> Piece of wire driven by some electricity works well enough.
> No need for big pyro explosions.
Yes and the TetherSat CubeSat should be testing out exactly that next year,
see
http://www.uk.amsat.org/9165
73 Trevor M5AKA
------------------------------
Message: 2
Date: Thu, 6 Sep 2012 08:58:01 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] TechEdSat - Iridium and Orbcomm?
Message-ID:
<1346918281.69031.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
There's just been a comment posted on the AMSAT-UK website from Henry which
says:
"Iridium and Orbcomm have been dropped from TechEdSat (wires cut) for
regulatory reasons."
I must admit I had wondered about the satellite transmitting from space on
frequencies allocated to ground stations. Does anyone have any further
information ?
73 Trevor M5AKA
------------------------------
Message: 3
Date: Thu, 6 Sep 2012 10:06:05 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Homemade Satellites in Bloomberg Businessweek
Message-ID:
<1346922365.53182.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
About Sandy Antunes. (He used Kickstarter to raise the funds for an amateur
radio ground station to receive his Interorbital Systems TubeSat).
Why Yes, It Is Time for Homemade Satellites
http://www.businessweek.com/articles/2012-09-05/why-yes-it-is-time-for-homemad
e-satellites
73 Trevor M5AKA
------------------------------
Message: 4
Date: Thu, 6 Sep 2012 09:47:40 -0500
From: Thomas Doyle <tomdoyle1948@xxxxx.xxx>
To: Michael Adams <mda@xxxx.xxx>
Cc: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Re: satellite activity and future sats...
Message-ID:
<CAHnRQR+WrctHHrNw1GKHkC5h+k5nMYFT22ZpyQo5eF1y-V9pWw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi -
Thanks so much for your post. Many of us have been in this so long we
have completely lost touch with the needs of the new ham. You have
described the greatest needs in the sat hobby. Unfortunately we are
heading in a direction where we are suppose to create materials to
educate high school youth when we do not have even basic materials to
educate our own new sat users. Many old timers will say there is lots
of material out there and there is but it is very basic. There are
hundreds of great videos showing how to wave an Arrow antenna around
and make a contact but beyond that - not much. Unfortunately the
learning curve gets very steep very fast. Thanks again for taking the
time to share your insights. We need someone like you on the board.
tnx & 73 W9KE Tom Doyle
On Tue, Aug 28, 2012 at 8:48 AM, Michael Adams <mda@xxxx.xxx> wrote:
> Despite my callsign, I am a relatively new ham....and I am very, very new
> to the birds. I'm also new to the reflector, so please forgive any
> na?vete I exhibit.
>
> I wonder if what you're seeing is a generational shift, or at least a shift
> in the direction by which new hams are finding their way into the hobby
> (and the skills and interests they bring to the table), because there are
> plenty of new hams out there.
>
> Many of the new hams I've run into have either gotten involved in the hobby
> for emcomm purposes, or at least found emcomm early on their path (the
> latter is true for me). Some of them expand on from emcomm as they are
> introduced to other aspects of the hobby. I fell into satellite work by
> starting out playing with APRS and Winlink-over-packet. Then I learned
> about the ISS digipeater...and I realized that the challenge of trying to
> complete a contact during an 8-minute pass is kind of fun, and didn't
> require any equipment that I didn't already have. Then at Field Day, I
> got to see a demonstration of working AO-27. That looked like fun, so I
> got an Elk, plugged it into my spare HT, and a few minutes later heard an
> XE station calling as SO-50 rose above the horizon. That was cool, even
> if the neighbors think I looked nuts standing in the driveway, juggling an
> antenna, mic, and voice recorder, with an HT over-filling a shirt pocket.
>
> I suspect that a sizeable proportion of the new ham population would be
> considered "appliance operators", or at least they assemble and operate
> their stations with more of a hacker's mentality, rather than following the
> classic homebrew path. Personally, my fabrication skills suck, but I love
> finding new ways to use/abuse computers and equipment that I find.
> Building a tape-measure beam is certainly within my skillset, but building
> a complete setup of satellite antennas, with az/el rotor...it wouldn't be
> impossible for me, but I'd need a really strong incentive to do so (and
> even then, I'd probably keep an eye out, looking to see if I could buy,
> rather than build). When I look through what I'd need to do to be able to
> move beyond AO-27, SO-50, and the ISS...it seems like a lot of work (or
> expense), without too many opportunities to enjoy the effort. I'll
> probably do it someday, assuming the satellites are still operational, but
> there are plenty of items that are on my "to try" list that have a better
> ratio of (probable fun):(erg of effort or dollar of expense).
>
> Also, I trust you're aware of what transceivers are on the market. While
> shack-in-the-boxes are not uncommon, there are only a couple of rigs being
> sold new that look really good for non-FM satellite work, neither of which
> really mesh well into the other-interests/budget decision-making process.
> I dislike the TS-2000 for various reasons, and the IC-9100 is a lot of
> money for the limited additional utility I'd get out of it. My starter
> rig was an IC-7000, which does have VHF and UHF sideband, but it's
> full-duplex machine, and working uplink-and-downlink doppler adjustments on
> it is a pain. I think other entry-level VHF/UHF sideband capable rigs are
> similarly challenged. I occasionally look around to see what's available
> used....but here too the "how much will I have to spend, and what
> additional fun will I get out of it" factor comes into play. I'm sure the
> major manufacturers (or even some not-so-major manufacturers) would put new
> gear on the market if there were demand...but where's the demand?
>
> Add in the other complications at my location (an inconveniently-placed
> hill, lots of trees, an XYL who has opinions about aesthetics), and I
> percieve a big hurdle to move beyond the FM birds.
>
> So; why do I mention all this?
>
> First, count me among the "they" in "build it and they will come". None
> of my station challenges are insurmountable; I just haven't had enough
> motivation to tackle those challenges. Get a few more satellites up and
> have activity on them, or put up something in a molniya orbit, and my
> motivation level will increase significantly. I suspect other potentially
> interested folks have similar views.
>
> Second, consider the learning curve some of us new guys face, especially
> those of us who (for better or worse) don't have the homebrew skills that
> were more common in the past. There's plenty of simple, accessible
> information available for getting initiated into working the FM birds, but
> from the outside graduating to other satellite work seems daunting. Or,
> when building "it", consider what equipment is commonly available these
> days for "them" to come with. Perhaps this, in addition to the economics,
> is influencing the direction being set for future birds.
>
> Third, has someone considered putting together (as an example) a "VO-52 for
> dummies" set of videos for online consumption; something that would show
> the assembly of a minimally-suitable station, and working the satellite?
> I'd love to be proven wrong about how much I'd need to do to be able to
> work the linear birds. I plan on continuing to dabble even without such
> hand-holding, but I wouldn't object to having that wonderful "A-ha! I can
> do this!" moment accelerated.
>
> --
> *Michael D. Adams* (N1EN)
> Poquonock, Connecticut | mda@xxxx.xxx
>
>
>
> On Mon, Aug 27, 2012 at 8:00 PM, Bob DeVarney W1ICW
<we1u@xxxxxxxxxxx.xxx>wrote:
>
>> I am afraid you're right, Tom, and it pains me to admit it. I am not sure
>> why activity has dropped off.. but I can say in my own case I lost interest
>> in satellite operating after AO-40 died and have gone on to other things (
>> EME ) to use the existing equipment I had.
>>
>> From northern Vermont I can work pretty much all the active satellite ops
>> on the FM birds ( within my potential mutual footprint at least ) in a
>> weekend's worth of passes, so there was little incentive for me to
>> continue. I _have_ gotten back into sat operating recently, if only to work
>> the cobwebs out of my station.
>>
>> I wonder how many satellite operators still have AO-10 or AO-13-class
>> stations any more. I get the impression that many aspire to have a Yaesu
>> FT-847, Icom 910, or TS-2000 and an Arrow antenna. If that much. I hope I
>> am wrong.
>>
>> We as a community need to revitalize things.. the future does NOT lie with
>> more Cubesats.. or if it does, then I want no part of it. We need to
>> restore the legacy and primacy of AMSAT in space. I think if we could get
>> another LEO bird in the air we would see activity increase dramatically.
>>
>> I've been an AMSAT member since 1980, albeit on and off, and been on the
>> birds since 1987 give or take. Some of my most fun moments were working the
>> Russian RS birds, believe it or not. I was also an AMSAT Area Coordinator
>> for some years. I would love to participate in a dialogue of how to get
>> folks interested in satellite operating again, and/or representing AMSAT at
>> the local hamfests. But it might just echo the general lack of interest in
>> ham radio in general that I have observed.
>>
>> Guess I need to make a point of getting back on FO-29 and VO-52 more
>> often...
>>
>> 73 de W1ICW
>>
> _______________________________________________
> 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 from my computer.
tom ...
------------------------------
Message: 5
Date: Thu, 6 Sep 2012 15:41:09 +0100
From: "Graham Shirville" <graham@xxxxxxxxx.xxx>
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Fw: Digital Slow Scan in space
Message-ID: <D96F962E73C64F29850640E0B9D52837@xxxxxxx.xxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi All,
We are looking for a practical system to use on a 1U, or perhaps 2U, cubesat
to take medium definition images and transmit them to the ground on VHF for
educational outreach purposes.
All the usual cubesat mass, power, data budgets would apply but and I would
especially appreciate advice and guidance about the best type of digital
slow scan (or similar) system to adopt.
I am aware of the SSDV system used on some balloon flights
http://ukhas.org.uk/guides:ssdv
Thanks in advance for all comments ideas and observations and especially any
offers of support!
73
Graham
G3VZV
------------------------------
_______________________________________________
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!
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End of AMSAT-BB Digest, Vol 7, Issue 288
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