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CX2SA > SATDIG 13.01.12 21:13l 248 Lines 7525 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V7 24
Path: IZ3LSV<IW0QNL<VE2PKT<F1BBI<CX2SA
Sent: 120113/2005Z @:CX2SA.SAL.URY.SA #:47160 [Salto] FBB7.00e $:AMSATBB724
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: ISS Height Profiles @ Heavens-Above.com (Fabio Azzarello)
2. Re: [VHF] Re: Icom 451 questions (Bob- W7LRD)
3. Re: ISS Height Profiles @ Heavens-Above.com (Robert McGwier)
4. phobosgrunt crashing (Bob- W7LRD)
5. HI4/AJ5C Operations follow-up (Bob Herrell)
----------------------------------------------------------------------
Message: 1
Date: Fri, 13 Jan 2012 19:22:11 +0100
From: Fabio Azzarello <iw8qku@xxxxx.xxx>
To: Robert McGwier <rwmcgwier@xxxxx.xxx>
Cc: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Re: ISS Height Profiles @ Heavens-Above.com
Message-ID:
<CAG-zPHPVjwRG_W1eMgqwQ=R1uYmmmS_2tP6_t77AcsTe=SdWvA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Thanks Robert!
Clear now.
73s
Fabio
iw8qku/5
On Fri, Jan 13, 2012 at 4:59 PM, Robert McGwier <rwmcgwier@xxxxx.xxx> wrote:
> These maneuvers are not done continuously around the orbit. They are
> typically done in burns done at apogee and perigee if all they are doing is
> raising/lowering the orbit and minimizing any changes to the orbital plane.
>
> Think of it like this. When I turn the propulsion on, I do not change my
> CURRENT instantaneous position while I am burning. What I change is my
> velocity. So if I burn the motor at apogee and the motor is firing along
> my velocity vector, then I am speeding myself up. THIS RAISES PERIGEE
> because I will have the same height but my speed will cause the position on
> the OTHER SIDE of the orbit to be raised. Similarly, I slow down at
> apogee, perigee is lowered. If I speed up at perigee, apogee is raised,
> ........
>
> Did this help?
>
> Bob
>
>
> On Fri, Jan 13, 2012 at 10:28 AM, Fabio Azzarello <iw8qku@xxxxx.xxx>wrote:
>
>> Hello everybody,
>>
>> ISS heights plots are available at the following link:
>>
>>
http://www.heavens-above.com/OrbitHeight.aspx?satid=25544&startMJD=55610&lat=4
3&lng=11
>>
>> I've noticed that Apogee and Perigee heights have different behaviour
>> during reboosts (look at mid September for example),
>> could anybody help me to understand why?
>>
>> Thanks in advance,
>> 73s
>> Fabio
>> iw8qku/5
>> _______________________________________________
>> 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
>>
>
>
>
> --
> Bob McGwier
> Facebook: N4HYBob
> ARS: N4HY
>
>
>
------------------------------
Message: 2
Date: Fri, 13 Jan 2012 19:12:24 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: Crownhaven <crownhaven@xxxxxxxxx.xxx>
Cc: ICOM Reflector <icom@xxxxxxx.xxx.xxx>, "Amsat-Bb@xxxxx. Org"
<amsat-bb@xxxxx.xxx>, VHF REFLECTOR <vhf@xxxx.xxxxxxxx.xxx>
Subject: [amsat-bb] Re: [VHF] Re: Icom 451 questions
Message-ID:
<1220607923.666873.1326481944892.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
also check out http://www.w7jv.com/
nice guy, has done some work for me
73 Bob W7LRD
----- Original Message -----
From: "Crownhaven" <crownhaven@xxxxxxxxx.xxx>
To: "STeve Andre'" <andres@xxx.xxx>
Cc: "Amsat-Bb@xxxxx. Org" <amsat-bb@xxxxx.xxx>, "ICOM Reflector"
<icom@xxxxxxx.xxx.xxx>, "VHF REFLECTOR" <vhf@xxxx.xxxxxxxx.xxx>
Sent: Friday, January 13, 2012 6:00:39 AM
Subject: [amsat-bb] Re: [VHF] Re: ?Icom 451 questions
No more than $100. ?I actually think they are about worthless based on
the current radios available and the age unless you are just into
vintage radios. ?What are you going to use it for? ?I had a 251A as my
first two-meter rig for weak-signal work. ?It was deaf. ?It HAD to have
an outboard preamp. ?None of this generation of radios were very
sensitive based on the technology used at the time.
I would say it might be a great radio for your repeater work.
Steve, N4JQQ, EM55bd
STeve Andre' wrote:
> On 01/12/12 23:19, John Geiger wrote:
>> A local friend here has an Icom 451A 70cm all mode which he might
>> sell me. ?What is the typical selling price for these rigs? ?It is in
>> good physical condition with the mic and power cord. Are there any
>> typical problems that show up with these rigs as they age, that I
>> should be looking out for?
>>
>> 73s John AA5JG
>> _______________________________________________
>> 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
>>
> During my quest for x75 Icom rigs, I was told a few times that
> the 471 did not have a service manual, and you had to use a
> 271 manual for it. ?Since I have not ever seen one, I tend to
> think that is true.
>
> I've only used a 471 once, but I have respect for it. ?The
> larger problem with it may be its age, and getting some of
> the specialty ICs could be hard. ?I seem to remember a few
> of them selling on ebay in the $200 area?
>
> --STeve Andre'
> wb8wsf ?en72
> ------
> Submissions: ? ? ? ? ? ? ? ? ? ?vhf@xxxx.xxxxxxxx.xxx
> Subscription/removal requests: ?vhf-request@xxxx.xxxxxxxx.xxx
> Human list administrator: ? ? ? vhf-approval@xxxx.xxxxxxxx.xxx
> List rules and information: ? ?http://www-w6yx.stanford.edu/vhf/
>
_______________________________________________
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: Fri, 13 Jan 2012 14:29:46 -0500
From: Robert McGwier <rwmcgwier@xxxxx.xxx>
To: amsat bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ISS Height Profiles @ Heavens-Above.com
Message-ID:
<CA+K5gzen=LaLxZnFEASzK4Nyvxijne69d166x1rpYBx+4kH3Vw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
A picture was requested. The maneuver I described is well known and is
called a Hohmann Transfer. Here is a picture
http://commons.wikimedia.org/wiki/File:Hohmann_transfer_orbit.png
and here is the Wikipedia article.
http://en.wikipedia.org/wiki/Hohmann_transfer_orbit
--
Bob McGwier
Facebook: N4HYBob
ARS: N4HY
------------------------------
Message: 4
Date: Fri, 13 Jan 2012 19:32:45 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] phobosgrunt crashing
Message-ID:
<1054185385.667902.1326483165393.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
http://www.newscientist.com/article/dn21354-the-us-didnt-shoot-phobosgrunt-dow
n-but-could-have.html
this is a big satellite
------------------------------
Message: 5
Date: Fri, 13 Jan 2012 15:51:59 -0400
From: Bob Herrell <bob72601@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] HI4/AJ5C Operations follow-up
Message-ID:
<CAMQtZ2SE6G35XDvaBTQqSk4i3NgVcDU7rU9gSsaSRSFFrgkwUQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Good contacts today AO-27 1853z: N8RO, KB0RZD, K8YSE/P (EL97), AA5CK,
KD0QAF, WD9EWK, KD0QAE, K4MOA (EM85) and N4RQ. Tnx de Bob HI4/AJ5C
------------------------------
_______________________________________________
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 24
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