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CX2SA > SATDIG 08.12.11 21:33l 957 Lines 33841 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: LARES To Test Einstein's Theory (Andrew Glasbrenner)
2. cube sats and turn signals (wa4hfn@xxxxxxx.xxxx
3. Re: cube sats and turn signals (Andrew Glasbrenner)
4. Re: Fast1 (Steve Daniels)
5. Re: 9 cubesats on board Vega (Andrew Glasbrenner)
6. looking for info on using a telescope tripod for automatic
tracking (k4rjj@xxxxxxx.xxxx
7. No launching capability is not the only threat (Hans Lourens)
8. Re: 9 cubesats on board Vega (Andy Kellner)
9. Re: Link to Holiday Ham Song (Ng, Peter)
10. Re: 9 cubesats on board Vega (Andrew Glasbrenner)
11. Re: 9 cubesats on board Vega (Bruce Robertson)
12. Re: 2 Meter TV Interference (i8cvs)
13. Re: looking for info on using a telescope tripod for
automatic tracking (DF2MZ)
14. AO-7 V/A Transponder (Mode A) (Rsoifer@xxx.xxxx
----------------------------------------------------------------------
Message: 1
Date: Thu, 8 Dec 2011 06:41:06 -0500 (GMT-05:00)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: "Trevor ." <m5aka@xxxxx.xx.xx>, amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: LARES To Test Einstein's Theory
Message-ID:
<22838369.1323344467309.JavaMail.root@xxxxxxxxxxxxx.xxx.xx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Almasat would have been a GREAT satellite to have had a secondary amateur
two-way capability on; big, lots of power, and a great orbit. A few CTCSS
decoders and maybe one or two extra command lines, and there could have been
V/U or V/S voice capability, in a 1500km apogee orbit.
It's a good example of why all the individual AMSAT groups should be as
involved as possible with their own local educational projects from the
beginning. The right ham at the right place could have turned this into a
real gift for the community, and the university would have seen a huge
increase in outside help with telemetry.
The good thing is PWsat is on the same launch, has a FM to DSB transponder
capability, and it appears the team is planning on exercising it. I know
which satellite I'll help with telemetry before the others.
73, Drew KO4MA
-----Original Message-----
>From: "Trevor ." <m5aka@xxxxx.xx.xx>
>Sent: Dec 8, 2011 9:57 AM
>To: amsat-bb@xxxxx.xxx
>Subject: [amsat-bb] Re: LARES To Test Einstein's Theory
>
>--- On Thu, 8/12/11, Giulio AB2VY <giuliop70@xxx.xxx> wrote:
>> The Microsatellite on the left of LARES
>> http://spaceflightnow.com/vega/vv01/111207lares/
>> is "AlmaSat", first microsatellite of the University of Bologna (ITALY)
>
>IARU Coordinated frequencies at
>http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=39
>
>also see http://www.almasat.org/
>
>73 Trevor M5AKA
>
------------------------------
Message: 2
Date: Thu, 8 Dec 2011 15:36:25 +0000 (UTC)
From: wa4hfn@xxxxxxx.xxx
To: AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] cube sats and turn signals
Message-ID:
<261574519.300218.1323358585386.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
Cube sats are about as worthless to the ham op as turn signals are on our
cars, who uses them. How much can be learned from them that hasnt already
been done. Why cant the schools all get together and use the info from all
the ones in the past or did they really learn anything. beep beep beep
------------------------------
Message: 3
Date: Thu, 8 Dec 2011 07:16:05 -0500 (GMT-05:00)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: wa4hfn@xxxxxxx.xxxx AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: cube sats and turn signals
Message-ID:
<13441582.1323346566294.JavaMail.root@xxxxxxxxxxxxx.xxx.xx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
There is nothing that says they have to be useful to the general ham
community in order to exist. What they do is provide a mechanism for
university students to learn engineering and science. Elementary students
don't contribute to mathematics by learning to multiply, and likewise there
isn't necessarily an expectation that cubesats contribute to the state of
the art of anything. Yet, they often do. Commercial users are now looking at
cubesats and the technologies developed within them, as alternatives to the
VW bus sized satellites of the past. NASA is doing real science through
cubesats and NSF grants (although I agree these are a poor fit for the
amateur bands).
In the long term view, inclusion and support of cubesats into our community
will benefit all the AMSATs more than derision and ridicule has to this
point. Several cubes have attempted or will attempt to support amateur
two-way packages, i.e. DO-64, CO-65, PWsat, FunCube, UKube, Fox. Let's
encourage that, and stop with the self-centered view of the service.
73, Drew KO4MA
-----Original Message-----
>From: wa4hfn@xxxxxxx.xxx
>Sent: Dec 8, 2011 10:36 AM
>To: AMSAT <amsat-bb@xxxxx.xxx>
>Subject: [amsat-bb] cube sats and turn signals
>
>Cube sats are about as worthless to the ham op as turn signals are on our
cars, who uses them. How much can be learned from them that hasnt already
been done. Why cant the schools all get together and use the info from all
the ones in the past or did they really learn anything. beep beep beep
>_______________________________________________
>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: 4
Date: Thu, 8 Dec 2011 16:00:28 -0000
From: "Steve Daniels" <steve@xxxxxxxxxx.xxxxxxx.xx.xx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Fast1
Message-ID: <C38A1F1851AF40BA913771C35FFF7E2F@xxxxxxx>
Content-Type: text/plain; charset="us-ascii"
The satellite has been confirmed working by a member of the aprsisce yahoo
group.
Uplink 145.825MHz and downlink of 437.345MHz and an APRS path of FAST1
That was at 2011-12-08 00:35
Steve Daniels
G6UIM
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Tom Lubbers K8TL
Sent: 08 December 2011 15:09
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Fast1
Has anyone had any positive results?? I have beaconed with 1200 and 9600,
nothing.
After the 0330Z pass did copy RS0ISS on the same frequency pair, boy was my
element set off!!
Happy Holidays
Tom K8TL
_______________________________________________
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: Thu, 8 Dec 2011 07:25:15 -0500 (GMT-05:00)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: Stefan Wagener <wageners@xxxxx.xxx>, Andy Kellner
<hawat1@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 9 cubesats on board Vega
Message-ID:
<21002183.1323347116645.JavaMail.root@xxxxxxxxxxxxx.xxx.xx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I have a feeling that if a ESA member nation AMSAT group had a cubesat ready
to fly, it might be able to go. This situation is part of the Fox plan as I
understand it, to build more than one satellite, and have a "hot spare" for
such an opportunity.
73, Drew KO4MA
PS Andy, we do a little better than every 5 years. If you look at DO-64,
ARISSat-1, SO-67 and HO-68, we've averaged one a year over the past 4 years.
-----Original Message-----
>From: Stefan Wagener <wageners@xxxxx.xxx>
>Sent: Dec 8, 2011 10:17 AM
>To: Andy Kellner <hawat1@xxxxx.xxx>
>Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
>Subject: [amsat-bb] Re: 9 cubesats on board Vega
>
>Hi Andreas,
>
>very simple, politics.
>
>ITAR is killing AMSAT-NA and AMSAT-DL's leadership has openly
>denouced Cubesats. So two of the biggest AMSATs either can't or don't
>want to. Talk about a pathetic situation for our community.
>
>Stefan VE4NSA
>
>
>On Thu, Dec 8, 2011 at 7:28 AM, Andy Kellner <hawat1@xxxxx.xxx> wrote:
>> I'll be darned. 9 (nine!) cubesats on board of this launch vehicle and
the whole world wide amateur radio community has major problems finding
somebody to launch 1 every 5 years ?
>> Whats wrong with this picture ? I would like to find out why ESA for
example has no problems launching the cubesats by the dozend? (for free i
bet you),
>> but refuse to carry just one for us. Does somebody has ESA's email
address ?? :) Is it really all about the educational aspect of things ? We
can use that sales pitch, too.
>>
>>
>> Andreas - VK4HHH
>>
>>
>>
>> ________________________________
>> ?From: Trevor . <m5aka@xxxxx.xx.xx>
>> To: amsat-bb@xxxxx.xxx
>> Sent: Thursday, 8 December 2011 9:56 PM
>> Subject: [amsat-bb] Re: LARES To Test Einstein's Theory
>>
>> --- On Thu, 8/12/11, Bob- W7LRD <w7lrd@xxxxxxx.xxx> wrote:
>>> can't we squeeze a little bird in there?
>>
>> They'll be some CubeSat's on the launch I believe going into a 1500 by
300 km orbit see
>>
>> http://www.esa.int/esaMI/Education/SEM3N03MDAF_0.html
>>
>> 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
>
>_______________________________________________
>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: Thu, 8 Dec 2011 10:18:54 +0000 (UTC)
From: k4rjj@xxxxxxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] looking for info on using a telescope tripod for
automatic tracking
Message-ID:
<858830094.857068.1323339534660.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
Hi everyone.? I found a Meade telescope trpod with the az/el gears on it and
a worm drive for each.? There are no motors on it but I think that could be
fixed with a call to Meade parts.? What I'm looking for is a solution to
drive the motors with instruction from one of the sat tracking programs out
there.? Any help would be great.?
The tripod is a?medium duty model and has a top mount that is perfect for an
Arrow yagi set.
I made a short video of it.? Tell me what you think and what can be done.
Thanks!
Ronny
K4RJJ
http://www.youtube.com/watch?v=p_BcS6HjxTU
------------------------------
Message: 7
Date: Thu, 8 Dec 2011 15:59:45 +0100
From: "Hans Lourens" <pa4pcj@xxxxx.xxx>
To: <AMSAT-BB@xxxxx.xxx>
Subject: [amsat-bb] No launching capability is not the only threat
Message-ID: <003f01ccb5ba$06fc8a20$14f59e60$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hello fellow hams,
Just today I wash reading an article about new treats for the ham community
as a hole, watt are the problems of transmitting and receiving on
frequencies ho are also used by medical applications and watt are the
consequents if they are complaining about male functions in the same band.
Read it for yourself at the address here below
<http://www.arrl.org/news/fcc-grants-secondary-service-allocation-to-wireles
s-broadband-medical-micropower-networks>
http://www.arrl.org/news/fcc-grants-secondary-service-allocation-to-wireless
-broadband-medical-micropower-networks
73, Hans.
------------------------------
Message: 8
Date: Thu, 8 Dec 2011 08:47:40 -0800 (PST)
From: Andy Kellner <hawat1@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 9 cubesats on board Vega
Message-ID:
<1323362860.1812.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Well my point exactly. Somebody a while back jokingly put the concept out to
tape 2 woxoun ht's together, mount 2 antennas on some solar panels and throw
the thing out the window ...
I mean just think about it for a second: : take a 2 U cubesat frame, put the
guts of 2 HT's in there, together with a battery and some charging
electronics, mount antennas and of you go ?
Do we really _need_ remote command capability ? Or telemetry and all the
software ? Onboard scheduling ? Or would a simple homebrew-repeater-in-space
do ? I think the only intelligence you really need is
in the battery charger. Ok, it might become unpredictable if and when the
thing is switched on, based on low battery levels .. so what ? If its there
I work it, otherwise I wait for the next pass. Just make sure
it is smart enough to bridge batteries with a short.
I mean the concepts of Fox & friends and great. But I think we are at the
'less is more' point. I think many of us would prefer a simple-and-dirty fm
repeating sat which is actually flying, rather then all the great plans and
concepts
which take years and many many dollars to complete. ARISSAT was great, that
the antenna was missing not our fault. Cant we put another ARISSAT in
cubesat format together rather quickly, instead of re-inventing the wheel
over and over again ? Its a bit like letting a kid starve to death because
you don't have the resources to cook a gourmet meal. Guess what, a simple
ham-and-cheese sandwich will do.
Andreas - VK4HHH
________________________________
From: Thomas Doyle <tomdoyle1948@xxxxx.xxx>
To: Andy Kellner <hawat1@xxxxx.xxx>
Sent: Friday, 9 December 2011 1:25 AM
Subject: Re: [amsat-bb] 9 cubesats on board Vega
How many cubesats does the Amateur Radio community have ready for launch -
not talking, planning or thinking about about building but actually ready to
go ?
73 W9KE tom ...
On Thu, Dec 8, 2011 at 8:28 AM, Andy Kellner <hawat1@xxxxx.xxx> wrote:
I'll be darned. 9 (nine!) cubesats on board of this launch vehicle and the
whole world wide amateur radio community has major problems finding somebody
to launch 1 every 5 years ?
>Whats wrong with this picture ? I would like to find out why ESA for
example has no problems launching the cubesats by the dozend? (for free i
bet you),
>but refuse to carry just one for us. Does somebody has ESA's email address
?? :) Is it really all about the educational aspect of things ? We can use
that sales pitch, too.
>
>
>Andreas - VK4HHH
>
>
>
>________________________________
>?From: Trevor . <m5aka@xxxxx.xx.xx>
>To: amsat-bb@xxxxx.xxx
>Sent: Thursday, 8 December 2011 9:56 PM
>Subject: [amsat-bb] Re: LARES To Test Einstein's Theory
>
>--- On Thu, 8/12/11, Bob- W7LRD <w7lrd@xxxxxxx.xxx> wrote:
>> can't we squeeze a little bird in there?
>
>They'll be some CubeSat's on the launch I believe going into a 1500 by 300
km orbit see
>
>http://www.esa.int/esaMI/Education/SEM3N03MDAF_0.html
>
>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
>
--
Sent from my computer.
tom ...
------------------------------
Message: 9
Date: Thu, 8 Dec 2011 09:17:29 -0800
From: "Ng, Peter" <Peter.Ng@xxxxx.xx>
To: "'Kevin Deane'" <summit496@xxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Link to Holiday Ham Song
Message-ID:
<44D6D682B38A5D4FAA2DBDE4AFD3B87D8BD1AE3A@xxxxxxxx.xxxxxx.xxxxxx.xx>
Content-Type: text/plain; charset="us-ascii"
hahahaha....thanks Kevin and Gary! Merry Christmas to all... 73's Peter VE7NGP
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Kevin Deane
Sent: Wednesday, December 07, 2011 10:04 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Link to Holiday Ham Song
http://www.youtube.com/watch?v=c_9REVC4dtc hmm works for me thought it
was pretty good.
Kevin
KF7MYK
_______________________________________________
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: 10
Date: Thu, 8 Dec 2011 08:38:45 -0500 (GMT-05:00)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: Andy Kellner <hawat1@xxxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 9 cubesats on board Vega
Message-ID:
<17621134.1323351525561.JavaMail.root@xxxxxxxxxxxxx.xxx.xx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
>
>Well my point exactly. Somebody a while back jokingly put the concept out
to tape 2 woxoun ht's together, mount 2 antennas on some solar panels and
throw the thing out the window ...
>
>I mean just think about it for a second: : take a 2 U cubesat frame, put
the guts of 2 HT's in there, together with a battery and some charging
electronics, mount antennas and of you go ?
Do you think that will pass thermal, vaccuum or vibration testing? Without
that, you aren't getting on a launch, period. Designing, building, testing,
and passing those tests, takes effort, time, and money.
>Do we really _need_ remote command capability ?
Yes, it's a regulatory requirement. If your satellite interferes with some
other system, say a SARSAT or early launch warning satellite, you have to
have the ability to shut it down.
>
>I mean the concepts of Fox & friends and great. But I think we are at the
'less is more' point. I think many of us would prefer a simple-and-dirty fm
repeating sat which is actually flying, rather then all the great plans and
concepts
>which take years and many many dollars to complete. ARISSAT was great, that
the antenna was missing not our fault. Cant we put another ARISSAT in
cubesat format together rather >quickly, instead of re-inventing the wheel
over and over again ?
I agree with the sentiment, and have made the argument myself many times, as
some of the AMSAT engineering guys will loudly attest to. However, there is
a minimum level of responsibility and sophistication that has to go into a
satellite to meet launch requirements, and regulatory requirements. The
division of Fox into two satellites, one simple, and one more complex, is an
attempt to address the urgency of the situation now. A pair of HTs strapped
together would likely just make it harder to get on the next launch.
What we CAN do is provide two-way packages to other, usually larger,
missions for inclusion into their satellites. SO-67 and UKube are good
examples of this, but it could certainly be tried more often.
73, Drew KO4MA
------------------------------
Message: 11
Date: Thu, 8 Dec 2011 13:51:37 -0400
From: Bruce Robertson <ve9qrp@xxxxx.xxx>
To: Andy Kellner <hawat1@xxxxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 9 cubesats on board Vega
Message-ID:
<CA++Umb=Zw5a+Dp9kqZ-Rgzq7tdU6oj68wPTDuskhTSE=ys9X0w@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
On Thu, Dec 8, 2011 at 12:47 PM, Andy Kellner <hawat1@xxxxx.xxx> wrote:
> Well my point exactly. Somebody a while back jokingly put the concept out
to tape 2 woxoun ht's together, mount 2 antennas on some solar panels and
throw the thing out the window ...
>
> I mean just think about it for a second: : take a 2 U cubesat frame, put
the guts of 2 HT's in there, together with a battery and some charging
electronics, mount antennas and of you go ?
> Do we really _need_ remote command capability ? Or telemetry and all the
software ? Onboard scheduling ? Or would a simple homebrew-repeater-in-space
do ? I think the only intelligence you really need is
>
> in the battery charger. Ok, it might become unpredictable if and when the
thing is switched on, based on low battery levels .. so what ? If its there
I work it, otherwise I wait for the next pass. Just make sure
> it is smart enough to bridge batteries with a short.
>
Andy --
I appreciate your 'straw man' argument above. Let me respond to the
challenge it makes in what I hope you will take as a friendly manner.
First, I do believe there are international obligations to make any
satellite respond to commands, most importantly to switch 'off'.
Second, since the earliest, most basic, satellites only entailed
telemetry (and today's most basic satellites do the same), I don't
think one can claim that transmitting telemetry is the burden of
complexity that you suggest.
The largest part of your argument suggest that there are off-the-shelf
opportunities that we are not exploiting. But remember that space is a
very different environment than that for which woxoun engineers their
HTs. How would the final amplifier in that HT keep cool without any
air to draw away heat? How would the entire PCB act in a vacuum? Would
it survive the shaking that takes place during launch? Would it
consume power so excessively that two of them would never be sustained
by the solar power available? And then there is all the circuitry that
you would have to develop to ensure that the batteries are charged in
such a manner as to ensure a long life. It, too, would have to be
tested in the manner I described above.
Your argument also sneaks in a bit of a twist: perhaps because you
know that the HTs will be a tight fit, you stipulate a 2U cubesat
design. Fox is 1U. This matters greatly due to the current economics
of spaceflight. The bad news is, we no longer seem to get a free
lunch. The good news is that, if we can be satisfied with a very, very
small volume and weight, for the first time in history, we can buy a
launch for that very small volume and weight, on the order of $100,000
for 10cm^3 and 1kg. But since we aren't getting anything for free, the
next 10cm^3, your 2U bird, has a launch cost of on the order of
$200,000.
What we need, then, is some sort of miracle of miniaturization,
whereby a transponder (perferably not just FM, but SSB/CW, too) could
be shrunk and made to sip power far more abstemiously than ever
before. Behold: the software defined transponder. A huge step in this
field, and darn it all if OUR ORGANIZATION hasn't made it happen.
Listen to ARISSAT1's downlink: FM, transponded SSB/CW and telemetry
all generated by one SDX module. If you are lucky enough to hear your
own signal or make a short QSO, well, you've taken part in history.
> I mean the concepts of Fox & friends and great. But I think we are at the
'less is more' point. I think many of us would prefer a simple-and-dirty fm
repeating sat which is actually flying, rather then all the great plans and
concepts
> which take years and many many dollars to complete. ARISSAT was great,
that the antenna was missing not our fault. Cant we put another ARISSAT in
cubesat format together rather quickly, instead of re-inventing the wheel
over and over again ? Its a bit like letting a kid starve to death because
you don't have the resources to cook a gourmet meal. Guess what, a simple
ham-and-cheese sandwich will do.
Here's the great news, Andy. Fox1 basically *is* ARISSAT in 1U format,
with respect to the tricky stuff that you have concerns about. As an
amateur organization, we have cracked the SDX nut, and up there, right
now, is a bird with essentially the firmware necessary for Fox1 to
work. You advocate off-the-shelf components; in a sense, FOX1 and 2
will be built from them, but it will be our own shelf, with our own
components, ready to go.
Moreover, with this know-how we now can partner with other cubesat
projects of which there are likely to be many in the future, perhaps
providing our know-how in exchange for a transponder function once the
bird finishes its primary mission. (For now, due to ITAR, this would
be within the US, but perhaps ITAR will be made more reasonable in the
coming years.)
To my mind, AMSAT has a very exciting and achievable set of goals that
will involve launching amateur communication satellites that are
innovative, (relatively) inexpensive, replaceable, and potentially
reconfigurable. The fun is just starting!
73, Bruce
VE9QRP
>
> Andreas - VK4HHH
>
>
>
> ________________________________
> ?From: Thomas Doyle <tomdoyle1948@xxxxx.xxx>
> To: Andy Kellner <hawat1@xxxxx.xxx>
> Sent: Friday, 9 December 2011 1:25 AM
> Subject: Re: [amsat-bb] 9 cubesats on board Vega
>
>
> How many cubesats does the Amateur Radio community have ready for launch -
not talking, planning or thinking about about building but actually ready to
go ?
>
> 73 W9KE tom ...
>
>
> On Thu, Dec 8, 2011 at 8:28 AM, Andy Kellner <hawat1@xxxxx.xxx> wrote:
>
> I'll be darned. 9 (nine!) cubesats on board of this launch vehicle and the
whole world wide amateur radio community has major problems finding somebody
to launch 1 every 5 years ?
>>Whats wrong with this picture ? I would like to find out why ESA for
example has no problems launching the cubesats by the dozend? (for free i
bet you),
>>but refuse to carry just one for us. Does somebody has ESA's email address
?? :) Is it really all about the educational aspect of things ? We can use
that sales pitch, too.
>>
>>
>>Andreas - VK4HHH
>>
>>
>>
>>________________________________
>>?From: Trevor . <m5aka@xxxxx.xx.xx>
>>To: amsat-bb@xxxxx.xxx
>>Sent: Thursday, 8 December 2011 9:56 PM
>>Subject: [amsat-bb] Re: LARES To Test Einstein's Theory
>>
>>--- On Thu, 8/12/11, Bob- W7LRD <w7lrd@xxxxxxx.xxx> wrote:
>>> can't we squeeze a little bird in there?
>>
>>They'll be some CubeSat's on the launch I believe going into a 1500 by 300
km orbit see
>>
>>http://www.esa.int/esaMI/Education/SEM3N03MDAF_0.html
>>
>>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
>>
>
>
> --
>
> Sent from my computer.
>
> tom ...
> _______________________________________________
> 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
--
http://ve9qrp.blogspot.com
------------------------------
Message: 12
Date: Thu, 8 Dec 2011 19:22:07 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Ernie Howard" <w8eh.ernie@xxxxx.xxx>, "Wyatt Dirks"
<wyattdirks@xxx.xxx>, "'AMSAT-BB@xxxxx.xxxxx <amsat-bb@xxxxx.xxx>,
<fjamesa@xxxxxxx.xxx>
Subject: [amsat-bb] Re: 2 Meter TV Interference
Message-ID: <000c01ccb5d6$4ca65620$0401a8c0@xxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Ernie Howard" <w8eh.ernie@xxxxx.xxx>
To: "Wyatt Dirks" <wyattdirks@xxx.xxx>; "'AMSAT-BB@xxxxx.xxxxx
<amsat-bb@xxxxx.xxx>
Sent: Wednesday, December 07, 2011 10:31 PM
Subject: [amsat-bb] Re: 2 Meter TV Interference
On December 07, 2011 10:31 PM "Ernie Howard" , W8EH writes:
> Wyatt,
>
> < snip>
> The only other solution (as your local ham friend suggested) would be to
> get a stopband filter(blocking 144 to 148), and have your neighbor place
> it in between his antenna and TV amplifier. The problem is that these
> type of special filters are not cheap. And the neighbor might blame you
> if something happened to his TV..... ICE has a filter for this
> application. Not sure if they are still in production.
> http://www.iceradioproducts.com/filtersrf.html
>
> Ernie W8EH
>
Hi Ernie, W8EH
I agree with you that the neighbor might blame you if something
happened to his TV but if they are not against Wyatt's technical
intervention he can try the following stopband filter (blocking
144 to 148), placed just at the TV antenna input or just at the
input of the amplified splitter if necessary.
http://www.rjmb.net/vk6fja/tvi-filter/index.htm
I have just received this advice from James ,VK6FJA that I agree
because of my previous experience in solving my TVI problems in
HF and VHF in cooperation with the neighbor in my condo.
This 144 MHz Stop-Band TVI Filter is based on a QST article found
online and is easy to be duplicated and tuned without special instruments
as shown in Fig-2 of the above QST article.
73" de
i8CVS Domenico
------------------------------
Message: 13
Date: Thu, 08 Dec 2011 19:44:02 +0100
From: "DF2MZ" <Edgar.Kaiser@xxxxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: looking for info on using a telescope tripod
for automatic tracking
Message-ID: <4EE10572.2020907@xxxxxxxx.xx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Hi Ronny,
the motors for this kind of telescope drive are mostly synchronous
motors for AZ and DC motors for EL. The synchronous motor runs at a
fixed frequency to compensate earth's rotation. This is all not
compatible with antenna rotor control interfaces.
You need some kind of angular encoder or you need stepper motors. Also
telesope drives are slow, much slower than what you need for satellite
tracking. The AZ drive on a telescope only needs to perform one rotation
per day. It may have a faster correction mode but don't expect much from
such a cheap thing.
You will probably need to design something from scratch in order to
interface with the popular programs.
Cheers
Edgar
Am 08.12.2011 11:18, schrieb k4rjj@xxxxxxx.xxxx
>
>
> Hi everyone. I found a Meade telescope trpod with the az/el gears on it
and a worm drive for each. There are no motors on it but I think that could
be fixed with a call to Meade parts. What I'm looking for is a solution to
drive the motors with instruction from one of the sat tracking programs out
there. Any help would be great.
>
>
>
> The tripod is a medium duty model and has a top mount that is perfect for
an Arrow yagi set.
>
>
>
> I made a short video of it. Tell me what you think and what can be done.
>
>
>
> Thanks!
>
> Ronny
>
> K4RJJ
>
>
>
> http://www.youtube.com/watch?v=p_BcS6HjxTU
>
> _______________________________________________
> 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: 14
Date: Thu, 8 Dec 2011 14:14:03 -0500 (EST)
From: Rsoifer@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] AO-7 V/A Transponder (Mode A)
Message-ID: <1ece9.36bcfb0e.3c12667b@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
Operational linear transponder satellites have dwindled to only two: VO-52
and AO-7. The latter, now 37 years old, spends approximately half its
operating time on the V/A transponder, or what we used to call Mode A:
145.85-145.95 MHz uplink, 29.4-29.5 MHz downlink.
Unfortunately, activiity on the V/A transponder is quite low compared with
what it was in the 1970s. Today, as then, much of this problem can be
attributed to the V/A transponder's relatively weak downlink signal. In the
1970s, however, many users were able to solve this problem and work DX through
this transponder out to nearly 8,000 km.
How did they do it? As one of those 1970s users, I'll tell you: low-noise
preamplifiers and good 10-meter antennas. In 2011, most modern radios have
enough sensitivity that an external 29 MHz preamplifier should not be
required. That leaves the antenna. Most satellite users wouldn't think of
operating Mode U/V without good antennas. The 29 MHz band is no different.
As any successful 1970s Mode A user can attest, a good 10-meter beam is by
far the best choice. For best results, it should be pointed at the horizon,
not elevated. Why? For most users at temperate zone latitudes, AO-7's
elevation angle will be 10 degrees or less about half the time it is in range,
and 30 degrees or more only about 10% of the time. During that 10%, the
inverse-square law of distance will keep signals strong despite AO-7 being
outside the beam's major lobe..
As in HF operation, the beam should be mounted as high above ground as
possible. My friend Ben, W2BXA (now SK), with his beam at 20 meters, was
able[
to work stations up to 300 km farther away than I could with mine at only 10
meters. That is a large part of the reason why Ben held Satellite DXCC No.
1 while mine is No. 13.
If you cannot put up a beam, a rotary dipole is perhaps the next best
choice, again mounted as high as possible. If you cannot do that either,
try a
ground plane antenna, mounted so as to be clear of all obstructions. No
matter what your specific circumstances, put up the best 10-meter antenna you
can.
Let's use and enjoy BOTH transponders of AO-7!
73 Ray W2RS
------------------------------
_______________________________________________
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 6, Issue 665
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