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CX2SA > SATDIG 29.04.13 01:58l 886 Lines 25616 Bytes #999 (0) @ WW
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Read: GUEST
Subj: AMSAT-BB-digest V8 135
Path: IZ3LSV<IW8PGT<CX2SA
Sent: 130428/2347Z @:CX2SA.SAL.URY.SA #:5675 [Salto] FBB7.00e $:AMSATBB8135
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Path to HEO (George and Cheryl Abbott)
2. Re: Path to HEO (Joe Leikhim)
3. Re: Path to HEO (Stefan Wagener)
4. Re: G5500 Rotor motor Question (amended) (i8cvs)
5. What birds (anelson@xxx.xxxxx.xxxx
6. Re: What birds (Bob- W7LRD)
7. Re: What birds (Limaunion)
8. Re: What birds (Chandler Y Heath)
9. Re: What birds (Dave W?DHB)
10. Re: G5500 Rotor motor Question (Gregory Beat)
11. Re: Path to HEO (Franklin Antonio)
12. TURKSAT-3USAT in US (Dave W?DHB)
13. Re: Path to HEO (g0mrf@xxx.xxxx
14. Re: Path to HEO (M5AKA)
15. Orbits Questions And Satellite Safety (Dave Marthouse)
16. Re: What birds (Adrian Engele)
17. Re: Path to HEO (Stefan Wagener)
----------------------------------------------------------------------
Message: 1
Date: Sun, 28 Apr 2013 15:05:25 -0400
From: "George and Cheryl Abbott" <ka1ajf@xxx.xxx>
To: "Lizeth Norman" <normanlizeth@xxxxx.xxx>, "Nick Pugh"
<quadpugh@xxxxxxxxx.xxx>
Cc: Amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Path to HEO
Message-ID: <F658586F3DF74F5FB12522F1B0A65CAA@xxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Great Job!73 to all. George, W1GMA.QTH about 20 south west of the Roger
Williams Park Zoo.
-----Original Message-----
From: Lizeth Norman
Sent: Sunday, April 28, 2013 2:35 PM
To: Nick Pugh
Cc: Amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Path to HEO
Sign me up. Sounds like the next big thing.
73 de Norm n3ykf
On Sun, Apr 28, 2013 at 2:14 PM, Nick Pugh <quadpugh@xxxxxxxxx.xxx> wrote:
> I have just returned from a satellite conference and I think new
> technology
> will now give us a path to HEO. Challenging of course but for the clever
> doable. Please take a look at a ~ 2 minute video that tells how
>
>
>
> http://www.youtube.com/watch?v=TpGnxlZC8Hs
>
>
>
>
>
>
>
> Thanks
>
>
>
> nick ARS K5QXJ EM30xa 30.1N 92.1W
>
> Office 337 593 8700
>
> Cell 337 258 2527
>
>
>
> Helping UL become a world Class Engineering and Educational School
>
>
>
> _______________________________________________
> 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: 2
Date: Sun, 28 Apr 2013 15:50:50 -0400
From: Joe Leikhim <rhyolite@xxxxxxxx.xxx>
To: quadpugh@xxxxxxxxx.xxxx "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Path to HEO
Message-ID: <517D7D9A.2010905@xxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Ditto; here, sounds like an promising direction.
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
JLeikhim@xxxxxxx.xxx
407-982-0446
WWW.LEIKHIM.COM
------------------------------
Message: 3
Date: Sun, 28 Apr 2013 15:06:42 -0500
From: Stefan Wagener <wageners@xxxxx.xxx>
To: George and Cheryl Abbott <ka1ajf@xxx.xxx>
Cc: AMSAT BB <Amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Path to HEO
Message-ID:
<CAKu8kHBmonBqwsAsac4BHSx5bPSF5R4xwWcqiRX=EosOiP61Cg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I always thought that to get to a suitable HEO you need to start at a
suitable GTO and not LEO.
I guess they forgot to mention that at the conference? So it doesn't matter
what the propulsion is unless you start at the right orbit it is not of
much use. Getting to GTO is the money issue. No free rides to GTO.
In addition, doesn't the process getting from GTO to HEO require some form
of rapid acceleration? If yes, ion engines and solar sails are out.
Thoughts?
Stefan, VE4NSA
On Sun, Apr 28, 2013 at 2:05 PM, George and Cheryl Abbott
<ka1ajf@xxx.xxx>wrote:
> Great Job!73 to all. George, W1GMA.QTH about 20 south west of the Roger
> Williams Park Zoo.
>
> -----Original Message----- From: Lizeth Norman
> Sent: Sunday, April 28, 2013 2:35 PM
> To: Nick Pugh
> Cc: Amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: Path to HEO
>
>
> Sign me up. Sounds like the next big thing.
> 73 de Norm n3ykf
>
> On Sun, Apr 28, 2013 at 2:14 PM, Nick Pugh <quadpugh@xxxxxxxxx.xxx> wrote:
>
> I have just returned from a satellite conference and I think new
>> technology
>> will now give us a path to HEO. Challenging of course but for the clever
>> doable. Please take a look at a ~ 2 minute video that tells how
>>
>>
>>
>>
http://www.youtube.com/watch?**v=TpGnxlZC8Hs<http://www.youtube.com/watch?v=Tp
GnxlZC8Hs>
>>
>>
>>
>>
>>
>>
>>
>> Thanks
>>
>>
>>
>> nick ARS K5QXJ EM30xa 30.1N 92.1W
>>
>> Office 337 593 8700
>>
>> Cell 337 258 2527
>>
>>
>>
>> Helping UL become a world Class Engineering and Educational School
>>
>>
>>
>> ______________________________**_________________
>> 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://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<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<http://amsat.org/mailman/listinfo
/amsat-bb>
>
------------------------------
Message: 4
Date: Sun, 28 Apr 2013 22:07:00 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Mike Hoblinski" <hobergenix@xxxxxxxxx.xxx>, "Amsat - BBs"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: G5500 Rotor motor Question (amended)
Message-ID: <000001ce444c$45d7d8e0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Mike Hoblinski" <hobergenix@xxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Sunday, April 28, 2013 7:55 AM
Subject: [amsat-bb] G5500 Rotor motor Question
> Anybody know what the rpm of the AC motors are. I know from the Yaesu
> specs that after all of the gear reduction they list EL as 67 seconds for
> EL and 58 Seconds for AZ.
>
> I would like to experiment with an AZ and EL system but like to see what
> RPM the motor starts out with and how much torque to get the final
> results. They show Elevation at 101 FT-LBS and AZ at 44 FT-lbs.
>
> I have looked around to see if somewhere the specs are available for the
> motor but have had no luck. I have seen quite a few pictures of rebuilds
> of that rotor with part number and have a manual that shows parts.
>
> Mike Hoblinski
>
> N6IMF
>
>
Hi Mike, N6IMF
Apologise..........My previous message was wrong !
This one is correct.
The EL and the AZ motors of a G5500 rotator are squarrel cage AC
asynchronous motors.
The stator is wound with 4 crossed coils.
A couple of 2 opposite coils is the pole North-South called P
P = 1 because every 2 coils represents one pole P and it is used to
run the motor.
The other couple of 2 opposite coils is used with a capacitor
in series only to generate a current 90 degrees out of phase to
start the motor.
The RPM (revolutions per minute) of a asynchronous motor is given by the
following formula:
f x 60
RPM = ------------- - S
P
where:
f = value of the frequency in Hz of the supply AC power
60 = 60 seconds into a minute
P = number of pole expansions of the motor
S = speed of gliding ( 7 % for small motors )
If you supply the motor with 24 volt 60 Hz as in USA than
60 x 60
RPM = -------------- = 3600 - 7% = 3348
1
When you run this motor in Europe with 50 Hz AC than the
speed is reduced to 2790 RPM
73" de
i8CVS Domenico
------------------------------
Message: 5
Date: Sun, 28 Apr 2013 15:13:16 -0500
From: <anelson@xxx.xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] What birds
Message-ID: <733D46A1DB5B418FA5A11486441172F6@xxxxx>
Content-Type: text/plain; charset="iso-8859-1"
I have spent all day getting my Icom 910h,,SatPC32, and my Yaesu 5400B all
back working again and tracking.
But now what birds are there up there that are still active? In the past I
worked AO-27, AO-51, FO-29, VO-52,
AO-7, and SO-50. Which of these are still operational and any new ones?
Thanks
Nels W0TUP
North Dakota
------------------------------
Message: 6
Date: Sun, 28 Apr 2013 20:54:05 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: anelson@xxx.xxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: What birds
Message-ID:
<164782794.577813.1367182445248.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxxx
xx.xxx>
Content-Type: text/plain; charset=utf-8
this will help
http://aar29.free.fr/sat/index.php
73 Bob W7LRD
----- Original Message -----
From: anelson@xxx.xxxxx.xxx
To: amsat-bb@xxxxx.xxx
Sent: Sunday, April 28, 2013 1:13:16 PM
Subject: [amsat-bb] What birds
I have spent all day getting my Icom 910h,,SatPC32, and my Yaesu 5400B all
back working again and tracking.
But now what birds are there up there that are still active? In the past I
worked AO-27, AO-51, FO-29, VO-52,
AO-7, and SO-50. Which of these are still operational and any new ones?
Thanks
Nels W0TUP
North Dakota
_______________________________________________
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: Sun, 28 Apr 2013 18:02:12 -0300
From: Limaunion <limaunion@xxxxxxxx.xxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: What birds
Message-ID: <517D8E54.3050300@xxxxxxxx.xxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 04/28/2013 05:13 PM, anelson@xxx.xxxxx.xxx wrote:
> I have spent all day getting my Icom 910h,,SatPC32, and my Yaesu 5400B all
back working again and tracking.
> But now what birds are there up there that are still active? In the past
I worked AO-27, AO-51, FO-29, VO-52,
> AO-7, and SO-50. Which of these are still operational and any new ones?
>
> Thanks
> Nels W0TUP
> North Dakota
> _______________________________________________
> 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
>
Hi, maybe this may help you: http://oscar.dcarr.org/
73
------------------------------
Message: 8
Date: Sun, 28 Apr 2013 16:08:20 -0500
From: Chandler Y Heath <convergx@xxxxx.xxx>
To: "anelson@xxx.xxxxx.xxxx <anelson@xxx.xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: What birds
Message-ID: <9F9A7A00-3722-4CC4-A02B-8C24A4C7AA17@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi Nels,
Welcome back! I just started working the Sats myself this winter. I have
been able to work SO-50, and FO-29. A bunch of new Sats have gone up in the
last couple of months, hopefully we will have some more FM Sats to work soon.
Cheers!
Chandler Y. Heath
Enterprise SE
Cisco Systems
7900 International Dr # 400 Minneapolis MN 55425-8912 United States
E.164 +1.952.967.8499
Mobile +1.612.462.4287 <--New!
Echolink: N0TOR
Twitter: tornadochaser
On Apr 28, 2013, at 3:13 PM, anelson@xxx.xxxxx.xxx wrote:
> I have spent all day getting my Icom 910h,,SatPC32, and my Yaesu 5400B all
back working again and tracking.
> But now what birds are there up there that are still active? In the past
I worked AO-27, AO-51, FO-29, VO-52,
> AO-7, and SO-50. Which of these are still operational and any new ones?
>
> Thanks
> Nels W0TUP
> North Dakota
> _______________________________________________
> 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: 9
Date: Sun, 28 Apr 2013 15:31:05 -0600
From: Dave W?DHB <dave@xxxxx.xxx>
To: <anelson@xxx.xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: What birds
Message-ID: <000601ce4457$b0c24bd0$1246e370$@xxx>
Content-Type: text/plain; charset="iso-8859-1"
Nels
FO-29,AO-7,VO-52 and SO-50 are all active
Dave W0DHB
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of anelson@xxx.xxxxx.xxx
Sent: Sunday, April 28, 2013 2:13 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] What birds
I have spent all day getting my Icom 910h,,SatPC32, and my Yaesu 5400B all
back working again and tracking.
But now what birds are there up there that are still active? In the past I
worked AO-27, AO-51, FO-29, VO-52, AO-7, and SO-50. Which of these are still
operational and any new ones?
Thanks
Nels W0TUP
North Dakota
_______________________________________________
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: Sun, 28 Apr 2013 16:31:06 -0500
From: Gregory Beat <gregory.beat@xxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: G5500 Rotor motor Question
Message-ID: <29912E51-F935-4F0D-A108-23E245764762@xxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
You could ask Dave Palmer, KB5WIA if he noted that spec.,
when he rebuilt his Yaesu motor last year (March 2012)
http://kb5wia.blogspot.com/2012/03/yaesu-g5500-rotator-motor-repair.html
w9gb
==
From: "Mike Hoblinski"
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] G5500 Rotor motor Question
Anybody know what the rpm of the AC motors are. I know from the Yaesu
specs that after all of the gear reduction they list EL as 67 seconds for EL
and 58 Seconds for AZ.
I would like to experiment with an AZ and EL system but like to see what RPM
the motor starts out with and how much torque to get the final results. They
show
Elevation at 101 FT-LBS and AZ at 44 FT-lbs.
I have looked around to see if somewhere the specs are available for the motor
but have had no luck. I have seen quite a few pictures of rebuilds of that
rotor
with part number and have a manual that shows parts.
Mike Hoblinski
N6IMF
==
------------------------------
Message: 11
Date: Sun, 28 Apr 2013 14:34:59 -0700
From: Franklin Antonio <antonio@xxx.xxxxxxxx.xxx>
To: Nick Pugh <quadpugh@xxxxxxxxx.xxx>
Cc: Amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Path to HEO
Message-ID:
<9111fd6d-4c7b-4f42-8453-b55b2b51ecce@xxxxxxxxxxx.xx.xxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 11:14 AM 4/28/2013, Nick Pugh wrote:
>I have just returned from a satellite conference and I think new technology
>will now give us a path to HEO.
I've thought for a long time that ion engines (small thrust pushing
for a long time, powered by electricity) could be of great value to us.
Has anyone done the calculation to see how long it would take to go
from LEO to HEO with an achievable ion engine? This seems like the
first thing to calculate. If it takes less than 1 year, it seems
worth serious investigation.
There are many other hurdles, of course, such as attitude control
(keeping solar panels pointed at the sun while at the same time
keeping engine pointed in the direction we want thrust, over a long
period of time). The schemes and compromises for these issues can be
worked if the basic thrust math works out.
N6NKF
------------------------------
Message: 12
Date: Sun, 28 Apr 2013 15:37:00 -0600
From: Dave W?DHB <dave@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] TURKSAT-3USAT in US
Message-ID: <000701ce4458$843fd630$8cbf8290$@xxx>
Content-Type: text/plain; charset="iso-8859-1"
TURKSAT-3USAT was not heard on 19:38 UTC pass today Beacon or Transponder
:-(
CUBEBUG was not heard either.
Dave W0DHB
------------------------------
Message: 13
Date: Sun, 28 Apr 2013 17:52:04 -0400 (EDT)
From: g0mrf@xxx.xxx
To: wageners@xxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Path to HEO
Message-ID: <8D01271C13ACFF1-CD4-223C4@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Hi Stefan.
No reason at all why a satellite can not be transferred from LEO to a
GTO style orbit.
A definate advantage would be to have the LEO orbit the same
inclination as the wanted 'GTO' orbit as it uses less fuel.
A consideration in the overall design would be to allow for the long
passage through the radiation belts.
Of course apogee 12000km and perigee 500km is a neat compromise.
73
David
-----Original Message-----
From: Stefan Wagener <wageners@xxxxx.xxx>
To: George and Cheryl Abbott <ka1ajf@xxx.xxx>
CC: AMSAT BB <Amsat-bb@xxxxx.xxx>
Sent: Sun, 28 Apr 2013 21:16
Subject: [amsat-bb] Re: Path to HEO
I always thought that to get to a suitable HEO you need to start at a
suitable GTO and not LEO.
I guess they forgot to mention that at the conference? So it doesn't
matter
what the propulsion is unless you start at the right orbit it is not of
much use. Getting to GTO is the money issue. No free rides to GTO.
In addition, doesn't the process getting from GTO to HEO require some
form
of rapid acceleration? If yes, ion engines and solar sails are out.
Thoughts?
Stefan, VE4NSA
On Sun, Apr 28, 2013 at 2:05 PM, George and Cheryl Abbott
<ka1ajf@xxx.xxx>wrote:
> Great Job!73 to all. George, W1GMA.QTH about 20 south west of the
Roger
> Williams Park Zoo.
>
> -----Original Message----- From: Lizeth Norman
> Sent: Sunday, April 28, 2013 2:35 PM
> To: Nick Pugh
> Cc: Amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: Path to HEO
>
>
> Sign me up. Sounds like the next big thing.
> 73 de Norm n3ykf
>
> On Sun, Apr 28, 2013 at 2:14 PM, Nick Pugh <quadpugh@xxxxxxxxx.xxx>
wrote:
>
> I have just returned from a satellite conference and I think new
>> technology
>> will now give us a path to HEO. Challenging of course but for the
clever
>> doable. Please take a look at a ~ 2 minute video that tells how
>>
>>
>>
>>
http://www.youtube.com/watch?**v=TpGnxlZC8Hs<http://www.youtube.com/watch?v=Tp
GnxlZC8Hs>
>>
>>
>>
>>
>>
>>
>>
>> Thanks
>>
>>
>>
>> nick ARS K5QXJ EM30xa 30.1N 92.1W
>>
>> Office 337 593 8700
>>
>> Cell 337 258 2527
>>
>>
>>
>> Helping UL become a world Class Engineering and Educational School
>>
>>
>>
>> ______________________________**_________________
>> 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://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<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<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: 14
Date: Sun, 28 Apr 2013 22:57:47 +0100 (BST)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: AMSAT BB <Amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Path to HEO
Message-ID:
<1367186267.93825.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
--- On Sun, 28/4/13, Stefan Wagener <wageners@xxxxx.xxx> wrote:
> I always thought that to get to a suitable HEO you need to start at a
> suitable GTO and not LEO.
There's no reason why you couldn't go from a 310 km LEO orbit, it just takes
time.
Romit-1 is a 2U CubeSat developed by Euroluna volunteers. It has an ion
engine and they reckon it'll take a year to go from a 310 km orbit to 700
km. With Ion motors you can get CubeSats to decent orbits even if the
initial deployment is into one of the cheapest 310 km orbits but you may
have to wait a few years.
The problem at the moment is the shortage of low-cost LEO launches.
Currently a 2U launch would cost you about $150,000+ Hopefully launch
opportunities will increase and prices fall in the coming years. Certainly
Federal Government funded CubeSat launch programs such as ELaNa, would be
one option in the 2015-2018 time frame for those in the US.
I think Euroluna have been waiting 2 years now for a launch, there are a
number of other groups also trying to fly CubeSat's with Ion Motors.
Some info on Romit-1 is at
http://amsat-uk.org/2012/03/01/euroluna-oz9luna-cubesat-launch-update/
73 Trevor M5AKA
------------------------------
Message: 15
Date: Sun, 28 Apr 2013 18:59:06 -0400
From: "Dave Marthouse" <dmarthouse@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Orbits Questions And Satellite Safety
Message-ID: <517da9c1.e861310a.4649.ffffc4b5@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I know that the earth is surrounded by radiation belts that have the
potential of damaging satellites. How dense are they and around what
altitudes do they have their most harmful affects? I am going to hazard a
guess that this is why higher leo satellites (let's say over 1500 miles
high) haven't been launched over the years. Any information would be
appreciated.
Dave Marthouse N2AAM
dmarthouse@xxxxx.xxx
------------------------------
Message: 16
Date: Sun, 28 Apr 2013 16:02:42 -0700 (PDT)
From: Adrian Engele <aa5uk@xxxxx.xxx>
To: Amsat BB <amsat-bb@xxxxx.xxx>, "anelson@xxx.xxxxx.xxxx
<anelson@xxx.xxxxx.xxx>
Subject: [amsat-bb] Re: What birds
Message-ID:
<1367190162.68805.androidMobile@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
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Try this site.
http://oscar.dcarr.org/
73, Adrian AA5UK
from Yahoo! Mail on Android
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Message: 17
Date: Sun, 28 Apr 2013 18:29:53 -0500
From: Stefan Wagener <wageners@xxxxx.xxx>
To: M5AKA <m5aka@xxxxx.xx.xx>
Cc: AMSAT BB <Amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Path to HEO
Message-ID:
<CAKu8kHDEkdzinhJSUMS_-dGu_3ukjh-SyrxFRhrxqztFz7RdBw@xxxx.xxxxx.xxx>
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Thanks,
maybe I didn't make myself clear:
LEO (low earth orbit) from 400 to 2000km or something like that
HEO (high earth orbit) >20000km
Going from 310 to 700km in a year is not doing us anything. We need a
highly elliptical orbit (Apogee ~60000km, Perigee 900km) similar to AO-40
to allow for cross continental communication.
Stefan VE4NSA
On Sun, Apr 28, 2013 at 4:57 PM, M5AKA <m5aka@xxxxx.xx.xx> wrote:
> --- On Sun, 28/4/13, Stefan Wagener <wageners@xxxxx.xxx> wrote:
> > I always thought that to get to a suitable HEO you need to start at a
> > suitable GTO and not LEO.
>
> There's no reason why you couldn't go from a 310 km LEO orbit, it just
> takes time.
>
> Romit-1 is a 2U CubeSat developed by Euroluna volunteers. It has an ion
> engine and they reckon it'll take a year to go from a 310 km orbit to 700
> km. With Ion motors you can get CubeSats to decent orbits even if the
> initial deployment is into one of the cheapest 310 km orbits but you may
> have to wait a few years.
>
> The problem at the moment is the shortage of low-cost LEO launches.
> Currently a 2U launch would cost you about $150,000+ Hopefully launch
> opportunities will increase and prices fall in the coming years. Certainly
> Federal Government funded CubeSat launch programs such as ELaNa, would be
> one option in the 2015-2018 time frame for those in the US.
>
> I think Euroluna have been waiting 2 years now for a launch, there are a
> number of other groups also trying to fly CubeSat's with Ion Motors.
>
> Some info on Romit-1 is at
> http://amsat-uk.org/2012/03/01/euroluna-oz9luna-cubesat-launch-update/
>
> 73 Trevor M5AKA
>
>
>
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End of AMSAT-BB Digest, Vol 8, Issue 135
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