>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.
The main requirement for escaping from LEO is that the engine thrust must
exceed the atmospheric drag force. The time required to reach a HEO orbit
mainl
In this case absent propulsion there probably was not much of a ride...however
SpaceX is coming up with some launches (like the upcoming one from Vandy) where
they are mass plus and the second stage is going to make some post deployment
burns...to bad nothing to stick on it Robert WB5MZO
> Dat
At 03:59 PM 4/28/2013, Dave Marthouse wrote:
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?
http://en.wikipedia.org/wiki/Van_Allen_Belts
_
Well I did a rough back of the envelope calculation for the time required to
accumulate the energy necessary to get from LEO to HEO, but there are a lot of
details that still need to be calculated. And the devil is in the details. But
this will get things started
The difference in orbital energ
> Thanks,
>
> maybe I didn't make myself clear:
>
> LEO (low earth orbit) from 400 to 2000km or something like that
> HEO (high earth orbit) >2km
>
> Going from 310 to 700km in a year is not doing us anything. We need a
> highly elliptical orbit (Apogee ~6km, Perigee 900km) similar to
Icom AG-25 mast mount 2 meter preamp
Mirage KP-1/440 70 cm GaAsFET preamp
G-5500 control box and elevation rotor (no az rotor)
Alinco ELH-730D 70 cm linear amp (3W in for 30W out) w/preamp
Radio Shack 2 meter amp (Cat. # 19-1122)
Pix available. If interested, please contact me off list.
Gle
Some on amsat-bb are not on Facebook. The Turksat3usat Team posts most
of their updates on Facebook. Here is a copy/paste from Turksat3usat
Fan Club on Facebook today:
Turksat3usat Fan Club
Önemli: TURKSAT-3USAT uydumuz bu gece Türkiye üzerinden yüksek açıda
geçecek. Radyo amatörlerinden ricamız
Icom AG-25 mast mount 2 meter preamp
Mirage KP-1/440 70 cm GaAsFET preamp
G-5500 control box and elevation rotor (no az rotor)
Alinco ELH-730D 70 cm linear amp (3W in for 30W out) w/preamp
Radio Shack 2 meter amp (Cat. # 19-1122)
Pix available. If interested, please contact me off list.
Gle
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
pa
Try this site.
http://oscar.dcarr.org/
73, Adrian AA5UK
from Yahoo! Mail on Android
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On 04/28/2013 05:13 PM, anel...@min.midco.net 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
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
See here for the latest news:
http://translate.google.com/translate?sl=es&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&eotf=1&u=http%3A%2F%2Fwww.exa.ec%2Fbp49%2F&act=url
73 de Norm n3ykf (Off to oa4 in the am)
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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) >2km
Going from 310 to 700km in a year is not doing us anything. We need a
highly elliptical orbit (Apogee ~6km, Perigee 900km) similar to AO-40
to allow for c
TURKSAT-3USAT was not heard on 19:38 UTC pass today Beacon or Transponder
:-(
CUBEBUG was not heard either.
Dave W0DHB
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Nels
FO-29,AO-7,VO-52 and SO-50 are all active
Dave W0DHB
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of anel...@min.midco.net
Sent: Sunday, April 28, 2013 2:13 PM
To: amsat-bb@amsat.org
Subject: [amsat-bb] What birds
I have spent
--- On Sun, 28/4/13, Stefan Wagener 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 i
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
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:
Subject: [amsat-bb] G5500 Rotor motor Question
Anybody know what the rpm o
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
this will help
http://aar29.free.fr/sat/index.php
73 Bob W7LRD
- Original Message -
From: anel...@min.midco.net
To: amsat-bb@amsat.org
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 b
- Original Message -
From: "Mike Hoblinski"
To:
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
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?
Thank
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 r
Ditto; here, sounds like an promising direction.
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
jleik...@leikhim.com
407-982-0446
WWW.LEIKHIM.COM
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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@amsat.org
Subject: [amsat-bb] Re: Path to HEO
Sign me up. Sounds like the next big thing.
7
yep a low orbit for that block of aluminum . I was Googleing around trying to
find out when and where it will deorbit. Will not that much mass make land
fall? It would probably create a meteor like trail. Maybe our meteor scatter
folks could make some use of that 8,377 block of aluminum.
73 Bob
Sign me up. Sounds like the next big thing.
73 de Norm n3ykf
On Sun, Apr 28, 2013 at 2:14 PM, Nick Pugh 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
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 K5Q
- Original Message -
From: "Mike Hoblinski"
To:
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
Bob,
Take a look at the orbit.
Alan
WA4SCA
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Bob- W7LRD
Sent: Sunday, April 28, 2013 12:34 AM
To: amsat-bb@amsat.org
Subject: [amsat-bb] satpc32 etc
Thanks to many and Dave KB1PVH I c
--- On Sat, 27/4/13, Lizeth Norman wrote:
> Got this tweet from Exa. What is a 160dB station?
Don't know about the 160 figure but given the very low power (for the 27 MHz
B/W) of the CubeSat I'd guess it may mean a very high-gain antenna system and a
low noise mast-head pre-amp is required.
Th
Turksat ,this morning pass over Europe nothing heard UK ...becon or
transponder.paul 2E1EUB
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