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CX2SA > SATDIG 10.06.12 21:03l 271 Lines 9099 Bytes #999 (0) @ WW
BID : AMSATBB7187
Read: GUEST
Subj: AMSAT-BB-digest V7 187
Path: IZ3LSV<IK2XDE<ON4HU<CX2ACB<CX2SA
Sent: 120610/1902Z @:CX2SA.SAL.URY.SA #:61265 [Salto] FBB7.00e $:AMSATBB7187
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Asymetric doppler curves? (David Johnson)
2. Re: a couple tweaks to work AO-27 & SO-50 (EMike McCardel)
3. Re: Commanding of AubieSat-1 Successful (N0JY)
4. Re: Commanding of AubieSat-1 Successful (Nick Pugh)
5. Re: Commanding of AubieSat-1 Successful (N0JY)
----------------------------------------------------------------------
Message: 1
Date: Sun, 10 Jun 2012 13:08:26 +0100
From: David Johnson <dave@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Asymetric doppler curves?
Message-ID: <4FD48E3A.20207@xxxxx.xx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi,
As do 'Predict' and it's derivatives.
My Java open source implementation does u/l and d/l and is used in GENSO
for realtime tracking, amongst others.
- Dave
On 10/06/12 03:23, i8cvs wrote:
> Hi David, G0MRF
>
> If you read the old issues of OSCAR-News from AMSAT-UK you
> will realize that a serious traking program like PLAN-10 written
> by James Miller G3RUH take into calculation all perturbations due
> to inclination and velocity of the satellite due to Earths rotational
> speed added / subtracted at either end of the pass and so doppler.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From:<g0mrf@xxx.xxx>
> To:<amsat-bb@xxxxx.xxx>
> Sent: Sunday, June 10, 2012 1:20 AM
> Subject: [amsat-bb] Asymetric doppler curves?
>
>
>> Hi all.
>>
>> I'm doing a small demonstration for a physics class using Doppler
>> measurements on the HO-68 beacon.
>>
>> Hopefully we'll be able to calculate spacecraft velocity and from that
>> result, go on to calculate orbit altitude. However, in thinking about
>> this I realised that there is a potential source of error. We are not
>> stationary !! - OK, it's obvious really, but I've never seen this
>> mentioned in topics like Doppler correction programs and I've not seen
>> it visually in displayed Doppler curves.
>>
>> The issue is that while a spacecraft with zero eccentricity will have a
>> constant velocity, the speed relative to an observer on Earth at AOS
>> and LOS will be different for each half of the pass depending on the
>> observers latitude and the inclination of the satellite.
>>
>> The worse case would be something travelling East to West or West to
>> East as the velocity of the satellite would have the Earths rotational
>> speed added / subtracted at either end of the pass.
>>
>> Has anyone seen this effect? Perhaps on the ISS? I think it could be
>> as much as 7% which may be measurable. - But not on HO-68 which is
>> polar orbiting....
>>
>> Just want to make the most of my 45 minutes.
>>
>> Thanks
>>
>> David G0MRF
>>
>> _______________________________________________
>> 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, 10 Jun 2012 10:50:51 -0400
From: EMike McCardel <mccardelm@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: a couple tweaks to work AO-27 & SO-50
Message-ID: <97D82D01-0F0D-4AFD-8D46-3D3790556599@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Here's a quick and dirty trick for estimating elevation I learn in an
astronomy club. I'm pretty average so it works great for me.
Extend your arm position your hand facing back at you. On average,
supposedly, each finger width represents 2 degrees. Hence each hand span,
including thumb, is 10 degrees.
I use this method all the time and I am usually pretty close.
EMike
EMike McCardel, KC8YLD
ARRL Ohio Section Affiliated Club Coordinator
Associate Direction of Education, AMSAT-NA
AMSAT-Edu Moderator
Sent from my iPhone
On Jun 9, 2012, at 15:47, Wayne Estes <w9ae@xxxxxxx.xxx> wrote:
> To measure elevation you can buy a simple elevation gauge or protractor.
>
> "Eyeballing" the elevation should get you within 10 degrees of the actual
elevation which is well within the beam width of your antennas.
>
> When using headphones it's easy to "peak" the antennas by ear. Simply
wave the antennas back and forth and stop when you get the best quieting (on
an FM sat). Or stop slightly "ahead" of the best quieting, so you won't
have to adjust it again so soon.
>
> Wayne Estes W9AE
> Oakland, Oregon, USA, Cn83ik
> _______________________________________________
> 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: 3
Date: Sun, 10 Jun 2012 10:05:03 -0500
From: N0JY <n0jy@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Commanding of AubieSat-1 Successful
Message-ID: <4FD4B79F.4010500@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi John,
My copy of the June 10, 2012 14:36 UTC pass from EM12DL (32.475833N,
97.745556W, 249M AMSL):
14:39 hi hi de ki4nqo aubiesat 1 vb 3r53 sk
14:40 hi hi de ki4nqo aubiesat 1 vb 3r52 sk
14:41 hi hi de ki4nqo aubiesat 1 vb 3r52 sk
14:42 hi hi de ki4nqo aubiesat 1 vb 3r56 sk
14:43 hi hi de ki4nqo aubiesat 1 vb 3r50 sk
14:44 hi hi de aubiesat 1 vb 3r52 beacon 111 sk
14:45 hi hi de ki4nqo aubiesat 1 vb 3r5? sk (QSB)
14:46 hi hi de ki4nqo aubiesat 1 vb 3r55 sk
14:47 hi hi de ki4nqo aubiesat 1 vb 3r52 sk
14:48 hi hi de ki4nqo aubiesat 1 vb 3r57 sk
14:49 hi hi de ki4nqo aubiesat 1 vb 3r53 sk
14:50 hi hi de ki4nqo aubiesat 1 vb 3r?? (LOS!)
73,
Jerry
N?JY
On 6/9/2012 11:13 PM, John Klingelhoeffer wrote:
> A short message was received earlier this Saturday evening indicating that
uplink commands sent to AubieSat-1 were properly received, decoded, and
initiated additional telemetry downlink data. AS-1 has been in orbit for
about 9 months. Stations are asked to continue to monitor the downlink and
pass any received telemetry to the group here for dissemination. Thanks and
73.
> _______________________________________________
> 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: Sun, 10 Jun 2012 10:15:18 -0500
From: "Nick Pugh" <quadpugh@xxxxxxxxx.xxx>
To: "'John Klingelhoeffer'" <wb4lnm@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Cc: 'Jean-Marie Wersinger' <aubiesat1@xxxxx.xxx>
Subject: [amsat-bb] Re: Commanding of AubieSat-1 Successful
Message-ID: <016a01cd471b$d8f0c800$8ad25800$@xxx>
Content-Type: text/plain; charset="iso-8859-1"
Fantastic and congratulations
Here is a video of the 9:36 AM cst pass.
http://www.youtube.com/watch?v=vNM1z7C6l-0
?
Thanks
?
nick
Office 337 593 8700
Cell????? 337 258 2527
?
Helping UL become a world Class Engineering ?and Educational School
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of John Klingelhoeffer
Sent: Saturday, June 09, 2012 11:13 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Commanding of AubieSat-1 Successful
A short message was received earlier this Saturday evening indicating that
uplink commands sent to AubieSat-1 were properly received, decoded, and
initiated additional telemetry downlink data. AS-1 has been in orbit for
about 9 months. Stations are asked to continue to monitor the downlink and
pass any received telemetry to the group here for dissemination. Thanks and
73.
_______________________________________________
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: Sun, 10 Jun 2012 11:25:44 -0500
From: N0JY <n0jy@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Commanding of AubieSat-1 Successful
Message-ID: <4FD4CA88.1030209@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
My copy of the June 10, 2012 16:13 UTC pass from EM12DL (32.475833N,
97.745556W, 249M AMSL):
16:17 hi hi de ki4nqo aubiesat 1 vb 3r59 sk
16:18 hi hi de ki4nqo aubiesat 1 vb 3r57 sk
16:19 hi hi de ki4nqo aubiesat 1 vb 3r55 sk
73,
Jerry
N?JY
------------------------------
_______________________________________________
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 7, Issue 187
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