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CX2SA > SATDIG 16.02.09 23:53l 220 Lines 6906 Bytes #999 (0) @ WW
BID : 9759-CX2SA
Read: GUEST
Subj: AMSAT-BB-digest V4 77
Path: IZ3LSV<IK2XDE<F5GOV<F4BWT<YO6PLB<CX2SA
Sent: 090216/2249Z @:CX2SA.LAV.URY.SA #:9759 [Minas] FBB7.00e $:9759-CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Rotator rebuild with stepper motor (Art McBride)
2. Sat Collision - Debris Field Animation (Clint Bradford)
3. Debris Falling Over Texas (Clint Bradford)
4. Re: Soft,,, Well Kind Of,, (Nigel Gunn G8IFF/W8IFF)
5. Re: Debris Falling Over Texas (Rocky Jones)
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Message: 1
Date: Sun, 15 Feb 2009 12:29:12 -0800
From: "Art McBride" <kc6uqh@xxx.xxx>
Subject: [amsat-bb] Re: Rotator rebuild with stepper motor
To: "'Angus'" <angus@xxxxxxxxx.xxxxxxxxx.xx.xx>, <AMSAT-BB@xxxxx.xxx>
Message-ID: <EB1BD37DE16E4B69833224D560EB26D0@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Gus,
I think I this is an excellent opportunity for an Amateur Radio experiment.
If you are successful, others may want to follow your lead. Having a
program that interfaces with tracking software and driving hardware that
works on USP ports would be a big plus.
Art, KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Angus
Sent: Sunday, February 15, 2009 11:44 AM
To: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Rotator rebuild with stepper motor
Hi all,
got given today an old rotator, looks OK with only a little weathering but
36 volt motor is burnt out completely.
Apparently the owner had bought it to turn an 9 ele 2mtr yagi but after a
year it was turning 6mtr beam, 4 mtr beam, 2 x 2mtr beams and 4 x 70cm yagis
and yes you guessed it, first good wind it burnt out the motor.
I had the unit apart and the gears look fine, as does everything else except
the motor which is completely dead.
I have over the last 2 years been building and using a homebrew PCB mill
complete with stepper motor interface and control software etc.
OK my thoughts are replace the AC motor with a good large stepper motor (I
gathered loads up whilst building my mill) and fit that into the housing and
build a completely new drive interface.
The idea is that the rotator should now have a stronger motor and also being
a stepper motor it should try and resist any movement whilst not in motion
(whilst powered up), also as an added bonus I should be able to control the
speed of rotation far more than a normal AC motor and almost have very small
steps whilst tracking a satellite and then speed the whole thing up when I
want to move to another satellite.
OK has anyone done this and if so what problems did they face, or does
anyone have any suggestions on what to do and what not to do.
The unit was free, I got a large lump of a stepper motor doing nothing and a
little time on my hands so not going to cost anything (in relative terms),
so it must be worth a try.
Knowing what my mill is like the unit could be positioned very accurately
and track at a really nice slow almost step less rate.
So got to be worth a try?
any thoughts
regards
Gus M0IKB
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------------------------------
Message: 2
Date: Sun, 15 Feb 2009 19:54:40 -0800
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Subject: [amsat-bb] Sat Collision - Debris Field Animation
To: amsat-bb@xxxxx.xxx
Message-ID: <04B880C6-1F0D-4BCC-B891-0B108ABC4FDC@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed
http://www.space.com/common/media/video/player.php?videoRef=SP_090212_IridiumC
osmos
Clint Bradford, K6LCS / KAF3359
909-241-7666
------------------------------
Message: 3
Date: Sun, 15 Feb 2009 19:55:57 -0800
From: Clint Bradford <clintbrad4d@xxxxxxxxx.xxx>
Subject: [amsat-bb] Debris Falling Over Texas
To: amsat-bb@xxxxx.xxx
Message-ID: <3FD1574C-78E3-4303-948F-C77E99633031@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed
http://www.news8austin.com/content/top_stories/default.asp?ArID=232111
Clint Bradford, K6LCS / KAF3359
909-241-7666
------------------------------
Message: 4
Date: Mon, 16 Feb 2009 04:09:19 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: Soft,,, Well Kind Of,,
To: Nate Duehr <nate@xxxxxxxx.xxx>
Cc: Joe <nss@xxx.xxx>, Bob Christy <rdc@xxxxx.xxxx>,
"amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <4998E6EF.4080104@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
There is atmosphere. Just not very much.
There's also solar wind and bombardment by photons, which have mass and
therefore exert a force on anything they hit.
Nate Duehr wrote:
> What would cause it to "decay" with no atmosphere?
------------------------------
Message: 5
Date: Sun, 15 Feb 2009 23:53:33 -0600
From: Rocky Jones <orbitjet@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Debris Falling Over Texas
To: <clintbrad4d@xxxxxxxxx.xxx>, Amsat BB <amsat-bb@xxxxx.xxx>
Message-ID: <COL106-W4AE9DC8C912E816A141F6D6B70@xxx.xxx>
Content-Type: text/plain; charset="Windows-1252"
Keep skylab falling hat handy...
Robert WB5MZO
> From: clintbrad4d@xxxxxxxxx.xxx
> To: amsat-bb@xxxxx.xxx
> Date: Sun, 15 Feb 2009 19:55:57 -0800
> Subject: [amsat-bb] Debris Falling Over Texas
>
>
> http://www.news8austin.com/content/top_stories/default.asp?ArID=232111
>
> Clint Bradford, K6LCS / KAF3359
> 909-241-7666
>
>
>
> _______________________________________________
> 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
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------------------------------
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End of AMSAT-BB Digest, Vol 4, Issue 77
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