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CX2SA > SATDIG 01.03.13 17:14l 806 Lines 25895 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. IARU Announces Frequencies for Korean Ham Radio CubeSat
OSSI-1 (Trevor .)
2. Re: STRaND-1 (PE0SAT | Amateur Radio)
3. Re: inquiry about homebrew az-el systems (Michael)
4. Fwd: UPDATE: 28375 AMSAT ECHO Close Approach Notification
(Andrew Glasbrenner)
5. Re: Fwd: UPDATE: 28375 AMSAT ECHO Close Approach Notification
(Andrew Glasbrenner)
6. Re: inquiry about homebrew az-el systems (Lizeth Norman)
7. Re: Fwd: UPDATE: 28375 AMSAT ECHO Close Approach Notification
(Ted)
8. STRaND1 silent during 03:25Z pass (Ken Swaggart)
9. STRaND1 back on (Ken Swaggart)
10. Re: inquiry about homebrew az-el systems (Gus)
11. Re: inquiry about homebrew az-el systems (Lizeth Norman)
12. Re: STRaND1 silent during 03:25Z pass (Hector, CO6CBF)
13. Re: inquiry about homebrew az-el systems (Gus)
14. Re: inquiry about homebrew az-el systems (Thomas Doyle)
15. Sites With Live Video Feed Of SpaceX Launch (B J)
16. kpc-9612 plus and online_kiss.exe (WA6FWF)
17. Possible Problems With Dragon (B J)
----------------------------------------------------------------------
Message: 1
Date: Thu, 28 Feb 2013 20:57:06 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] IARU Announces Frequencies for Korean Ham Radio
CubeSat OSSI-1
Message-ID:
<1362085026.66833.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
See
http://amsat-uk.org/2013/02/28/iaru-announces-frequencies-for-korean-ham-radio
-cubesat-ossi/
73 Trevor M5AKA
AMSAT-UK http://www.amsat-uk.org/
----
------------------------------
Message: 2
Date: Thu, 28 Feb 2013 22:12:47 +0100
From: PE0SAT | Amateur Radio <pe0sat@xxxxx.xx>
To: Roland Zurmely <py4zbz@xxxxx.xxx>, Amsat bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: STRaND-1
Message-ID: <ef8232427893491c533cc8b016094615@xxxxx.xx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Hi Roland,
Thanks for sharing the information.
Can you explain how you combine Satcontrole and SDRSharp?
Isn't there a conflict regarding who is controlling the FUNcube Dongle?
Can you tell me how you configure Satcontrole and SDRSharp? I have a
FUNcube
Dongle Pro and Pro+ (The last one i got operational with Satcontrole by
changing
the IO_Ext DLL)
73 Jan PE0SAT
On 28-02-2013 20:12, Roland Zurmely wrote:
> See here my setup for direct receiving STRaND-1 (no recording):
>
> http://www.qsl.net/py4zbz/strand.htm#b
>
> http://www.qsl.net/py4zbz/strand.htm#a
>
> 73 de Roland PY4ZBZ
--
With regards PE0SAT
Internet web-page http://www.pe0sat.vgnet.nl/
------------------------------
Message: 3
Date: Thu, 28 Feb 2013 18:02:01 -0500
From: Michael <Mat_62@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: inquiry about homebrew az-el systems
Message-ID: <512FE1E9.50205@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
This is what I was getting at when I made my earlier post about about
the old Gemini OR-360 TV rotators. The gear train is driven by a "540"
sized DC motor. I can tell you from experience that one of these rotors
will rotate a mini sized beam on HF. I do it everyday. So if we are
driving a smaller array, we might be able to eliminate some or all of
the gearing involved and go with one of the smaller motors. I can't
recall the issue but it seems to me I saw an article in QST where
someone was driving a small little beam on top of a tripod with a small
little motor. I still think a position pot is a better option for
pointing over a stepper motor though.
Michael, W4HIJ
On 2/27/2013 8:30 PM, Gus wrote:
> Returning to this topic...
>
> I'm thinking about a rotator that can handle a small system like the
> Arrow, or the Cushcraft A270-6s or even the A270-10s. NOT big boomers
> like the KLM 22/40 el CP yagis!
>
> So we're looking at 1? - 2 sq. ft of windloading, and maybe 10 lbs of
> weight. (Including some sort of crossboom, clamps, coax and
> counterweights. Rear mounted antennas like the Arrow will need a
> rear-mounted counterweight.)
>
> Anybody qualified to say what that adds up to in terms of TORQUE
> required from the motors? With a little extra thrown in for a safety
> margin, maybe?
>
> I think a simple, low-cost, easily reproducible design is probably
> doable, if we combine our ingenuity and expertise.
>
> -- 73, de Gus 8P6SM
> Barbados, the easternmost isle.
> _______________________________________________
> 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: Thu, 28 Feb 2013 19:35:28 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Fwd: UPDATE: 28375 AMSAT ECHO Close Approach
Notification
Message-ID: <8A38E677-51F4-43CB-97B5-AF5CF4AA6A75@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Another close one, even if AO51 is no longer operational.
73, Drew KO4MA
Sent from my iPhone
Begin forwarded message:
>
> The United States Joint Space Operations Center (JSpOC) has updated a
> predicted conjunction between AMSAT ECHO (SCC# 28375) and SCC# 32170.
>
> Primary Object: AMSAT ECHO (SCC# 28375)
> Secondary Object: SCC# 32170
> Time of Closest Approach: 01 MAR 2013 03:46 UTC
>
> Overall miss distance: 36 meters
> Radial (dU) miss distance: -36 meters
> In-Track (dV) miss distance: 3 meters
> Cross-track (dW) miss distance: -6 meters
>
> Primary Radial Error (U): 10 meters
> Primary In-Track Error (U): 34 meters
> Primary Cross-track Error (U): 16 meters
>
> Secondary Radial Error (U): 29 meters
> Secondary In-Track Error (U): 115 meters
> Secondary Cross-Track Error (U): 52 meters
>
>
------------------------------
Message: 5
Date: Thu, 28 Feb 2013 20:29:35 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: Robert McGwier <rwmcgwier@xxxxx.xxx>
Cc: amsat bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Fwd: UPDATE: 28375 AMSAT ECHO Close Approach
Notification
Message-ID: <0F5EA34A-6D19-49E0-887C-3ACBC5E9174A@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Swapping paint at up to 2x orbital velocity might get interesting. BTW it is
a piece of Chinese Fengyun 1-C debris.
Sent from my iPhone
On Feb 28, 2013, at 7:58 PM, Robert McGwier <rwmcgwier@xxxxx.xxx> wrote:
> As we used to say, JIMMINY CRICKETS! In the vacuum of space you could
hear that squealing by!
>
>
> On Thu, Feb 28, 2013 at 7:35 PM, Andrew Glasbrenner
<glasbrenner@xxxxxxxxxx.xxx> wrote:
>> Another close one, even if AO51 is no longer operational.
>>
>> 73, Drew KO4MA
>>
>> Sent from my iPhone
>>
>> Begin forwarded message:
>>
>> >
>> > The United States Joint Space Operations Center (JSpOC) has updated a
>> > predicted conjunction between AMSAT ECHO (SCC# 28375) and SCC# 32170.
>> >
>> > Primary Object: AMSAT ECHO (SCC# 28375)
>> > Secondary Object: SCC# 32170
>> > Time of Closest Approach: 01 MAR 2013 03:46 UTC
>> >
>> > Overall miss distance: 36 meters
>> > Radial (dU) miss distance: -36 meters
>> > In-Track (dV) miss distance: 3 meters
>> > Cross-track (dW) miss distance: -6 meters
>> >
>> > Primary Radial Error (U): 10 meters
>> > Primary In-Track Error (U): 34 meters
>> > Primary Cross-track Error (U): 16 meters
>> >
>> > Secondary Radial Error (U): 29 meters
>> > Secondary In-Track Error (U): 115 meters
>> > Secondary Cross-Track Error (U): 52 meters
>> >
>> >
>> _______________________________________________
>> 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
> Owner and Technical Director, Allied Communication, LLC
> Facebook: N4HYBob
> ARS: N4HY
> Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
------------------------------
Message: 6
Date: Thu, 28 Feb 2013 22:24:20 -0500
From: Lizeth Norman <normanlizeth@xxxxx.xxx>
To: Michael <Mat_62@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: inquiry about homebrew az-el systems
Message-ID:
<CAJUhCTOb21mmHkzvtc79frWTStXSAMfvJGok4tcczRxjJ-v5Cw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Michael, Gus and the gang,
It does not matter whether we use a pot or an absolute position
encoder. They are just registers, or in the case of the encoder, port
pins.
The Arduino has libraries to use either.
The size of the motor and the size of the geartrain can be scaled.
It's really a question of what's available.
A stepper still needs some sort of position feedback..
Norm
On Thu, Feb 28, 2013 at 6:02 PM, Michael <Mat_62@xxxxxxx.xxx> wrote:
> This is what I was getting at when I made my earlier post about about the
> old Gemini OR-360 TV rotators. The gear train is driven by a "540" sized
> DC motor. I can tell you from experience that one of these rotors will
> rotate a mini sized beam on HF. I do it everyday. So if we are driving a
> smaller array, we might be able to eliminate some or all of the gearing
> involved and go with one of the smaller motors. I can't recall the issue but
> it seems to me I saw an article in QST where someone was driving a small
> little beam on top of a tripod with a small little motor. I still think a
> position pot is a better option for pointing over a stepper motor though.
> Michael, W4HIJ
>
> On 2/27/2013 8:30 PM, Gus wrote:
>>
>> Returning to this topic...
>>
>> I'm thinking about a rotator that can handle a small system like the
>> Arrow, or the Cushcraft A270-6s or even the A270-10s. NOT big boomers like
>> the KLM 22/40 el CP yagis!
>>
>> So we're looking at 1? - 2 sq. ft of windloading, and maybe 10 lbs of
>> weight. (Including some sort of crossboom, clamps, coax and
counterweights.
>> Rear mounted antennas like the Arrow will need a rear-mounted
>> counterweight.)
>>
>> Anybody qualified to say what that adds up to in terms of TORQUE required
>> from the motors? With a little extra thrown in for a safety margin, maybe?
>>
>> I think a simple, low-cost, easily reproducible design is probably doable,
>> if we combine our ingenuity and expertise.
>>
>> -- 73, de Gus 8P6SM
>> Barbados, the easternmost isle.
>> _______________________________________________
>> 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: 7
Date: Thu, 28 Feb 2013 19:42:47 -0800
From: "Ted" <k7trkradio@xxxxxxx.xxx>
To: "'Andrew Glasbrenner'" <glasbrenner@xxxxxxxxxx.xxx>, "'Robert
McGwier'" <rwmcgwier@xxxxx.xxx>
Cc: 'amsat bb' <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Fwd: UPDATE: 28375 AMSAT ECHO Close Approach
Notification
Message-ID: <000001ce162e$d7970b30$86c52190$@xxx>
Content-Type: text/plain; charset="us-ascii"
...parts and debris will be falling on your local Wal Mart if its
Chinese...built in homing..
K7TRK
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Andrew Glasbrenner
Sent: Thursday, February 28, 2013 5:30 PM
To: Robert McGwier
Cc: amsat bb
Subject: [amsat-bb] Re: Fwd: UPDATE: 28375 AMSAT ECHO Close Approach
Notification
Swapping paint at up to 2x orbital velocity might get interesting. BTW it is
a piece of Chinese Fengyun 1-C debris.
Sent from my iPhone
On Feb 28, 2013, at 7:58 PM, Robert McGwier <rwmcgwier@xxxxx.xxx> wrote:
> As we used to say, JIMMINY CRICKETS! In the vacuum of space you could
hear that squealing by!
>
>
> On Thu, Feb 28, 2013 at 7:35 PM, Andrew Glasbrenner
<glasbrenner@xxxxxxxxxx.xxx> wrote:
>> Another close one, even if AO51 is no longer operational.
>>
>> 73, Drew KO4MA
>>
>> Sent from my iPhone
>>
>> Begin forwarded message:
>>
>> >
>> > The United States Joint Space Operations Center (JSpOC) has updated
>> > a predicted conjunction between AMSAT ECHO (SCC# 28375) and SCC# 32170.
>> >
>> > Primary Object: AMSAT ECHO (SCC# 28375) Secondary Object: SCC#
>> > 32170 Time of Closest Approach: 01 MAR 2013 03:46 UTC
>> >
>> > Overall miss distance: 36 meters
>> > Radial (dU) miss distance: -36 meters In-Track (dV) miss distance:
>> > 3 meters Cross-track (dW) miss distance: -6 meters
>> >
>> > Primary Radial Error (U): 10 meters Primary In-Track Error (U): 34
>> > meters Primary Cross-track Error (U): 16 meters
>> >
>> > Secondary Radial Error (U): 29 meters Secondary In-Track Error (U):
>> > 115 meters Secondary Cross-Track Error (U): 52 meters
>> >
>> >
>> _______________________________________________
>> 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
> Owner and Technical Director, Allied Communication, LLC
> Facebook: N4HYBob
> ARS: N4HY
> Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
_______________________________________________
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: 8
Date: Thu, 28 Feb 2013 19:45:00 -0800
From: "Ken Swaggart" <k.swaggart@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] STRaND1 silent during 03:25Z pass
Message-ID: <C888CF463BB94BDF944AD014D30CD7B0@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
During the 1 Mar 03:25Z to 03:39Z pass over the Western US nothing was heard
from STRaND1 on 437.568 MHz. (During the previous pass at 01:45Z telemetry
was received.)
73,
Ken, W7KKE
CN75xa
------------------------------
Message: 9
Date: Thu, 28 Feb 2013 21:16:30 -0800
From: "Ken Swaggart" <k.swaggart@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] STRaND1 back on
Message-ID: <B32BF0B4EBAA47B4A466A8A0B252C9BB@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
During the 1 Mar 0505-0514Z low elevation pass over the Pacific, STRaND1
appeared to be transmitting normal telemetry again.
73,
Ken, W7KKE
CN75xa
------------------------------
Message: 10
Date: Fri, 01 Mar 2013 01:29:51 -0400
From: Gus <8p6sm@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: inquiry about homebrew az-el systems
Message-ID: <51303CCF.5060602@xxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 02/28/2013 11:24 PM, Lizeth Norman wrote:
> A stepper still needs some sort of position feedback..
>
>
Not really.
Steppers rotate a predictable amount with each step. To calibrate, the
software only needs to count steps from one limit switch to the other.
Then, by keeping track of step count (+/-), it will always know exactly
how far round the turn it is. It can store last position in NV RAM or
EEPROM, so as to avoid the need to recalibrate on every startup.
Unfortunately, I can't think of a common source for surplus steppers of
useful size. And driving them is slightly more complicated than firing
a relay to a DC motor.
OK, why do we have to use A multi-turn pot? Why not just an ordinary
linear pot?
-- 73, de Gus 8P6SM
Barbados, the easternmost isle.
------------------------------
Message: 11
Date: Fri, 1 Mar 2013 01:17:46 -0500
From: Lizeth Norman <normanlizeth@xxxxx.xxx>
To: Gus <8p6sm@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: inquiry about homebrew az-el systems
Message-ID:
<CAJUhCTOg2Q2BPYdR2pWdu75zwZ5bt1spid_2C3DNcwcXHRaPfg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Gus and all:
Had a bad experience with a stepper motor based 3 axis mill project.
That thing had a mind of it's own. Definitely needed the big red kill
switch every once in a while.
The choice of a position sensor is as much as what you can get locally
that meets the need as what will work.
Three turn pots are necessary unless we want to limit rotation to 360
degrees. Easy enough to in satpc32.
Also, not all pots rotate 360. Some only 320, some less. The more
expensive pots have much greater possible feature set. The Arduino
does not care what we use..
What sort of position encoders are available in your local surplus
store? How about available as salvage from other gear??
Am going to Peru towards the end of April. What's available here and
what's available there are two different things.
Last time I visited, a few OT's and I had a conversation regarding
exactly what we have been discussing, namely an inexpensive full
featured satellite station using mostly homebrew for super cheep.
Norm
On Fri, Mar 1, 2013 at 12:29 AM, Gus <8p6sm@xxxx.xxx> wrote:
> On 02/28/2013 11:24 PM, Lizeth Norman wrote:
>>
>> A stepper still needs some sort of position feedback..
>>
>>
> Not really.
>
> Steppers rotate a predictable amount with each step. To calibrate, the
> software only needs to count steps from one limit switch to the other.
> Then, by keeping track of step count (+/-), it will always know exactly how
> far round the turn it is. It can store last position in NV RAM or EEPROM,
> so as to avoid the need to recalibrate on every startup.
>
> Unfortunately, I can't think of a common source for surplus steppers of
> useful size. And driving them is slightly more complicated than firing a
> relay to a DC motor.
>
>
> OK, why do we have to use A multi-turn pot? Why not just an ordinary linear
> pot?
>
>
> -- 73, de Gus 8P6SM
> Barbados, the easternmost isle.
> _______________________________________________
> 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: 12
Date: Fri, 1 Mar 2013 01:27:13 -0500
From: "Hector, CO6CBF" <co6cbf@xxxxxx.xx.xx>
To: "'Ken Swaggart'" <k.swaggart@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: STRaND1 silent during 03:25Z pass
Message-ID: <001501ce1645$d4bbe040$7e33a0c0$@xx.xx>
Content-Type: text/plain; charset="us-ascii"
Hello Ken and all,
During the 1 Mar 0019z pass, telemetry from STRaND-1 on 437.568 MHz was
received in EL92sd. The beacon has a great signal!
73!
Hector, CO6CBF
EL92sd
-----Mensaje original-----
De: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx En nombre
de Ken Swaggart
Enviado el: jueves, 28 de febrero de 2013 22:45
Para: amsat-bb@xxxxx.xxx
Asunto: [amsat-bb] STRaND1 silent during 03:25Z pass
During the 1 Mar 03:25Z to 03:39Z pass over the Western US nothing was heard
from STRaND1 on 437.568 MHz. (During the previous pass at 01:45Z telemetry
was received.)
73,
Ken, W7KKE
CN75xa
_______________________________________________
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: 13
Date: Fri, 01 Mar 2013 04:51:09 -0400
From: Gus <8p6sm@xxxx.xxx>
To: Lizeth Norman <normanlizeth@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: inquiry about homebrew az-el systems
Message-ID: <51306BFD.8050001@xxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 03/01/2013 02:17 AM, Lizeth Norman wrote:
> Three turn pots are necessary unless we want to limit rotation to 360
> degrees. Easy enough to in satpc32.
> Also, not all pots rotate 360. Some only 320, some less. The more
> expensive pots have much greater possible feature set.
Unless we want lightning fast antenna rotation, we're going to need some
sort of gearbox with virtually any motor we're likely to find. We could
gear the drive to a simpler pot as well.
--
73, de Gus 8P6SM
Barbados, the easternmost isle.
------------------------------
Message: 14
Date: Fri, 1 Mar 2013 09:52:07 -0500
From: Thomas Doyle <tomdoyle1948@xxxxx.xxx>
To: Lizeth Norman <normanlizeth@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: inquiry about homebrew az-el systems
Message-ID:
<CAHnRQRKc+xquE_HmUcXngr_kECKat81-zExK04rEMu-HDjZKqg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Norm,
Stepper motors work. You can actually see it turning two real sat antennas
on a 4 foot cross boom and it is not as big as a bike. No obscure parts
used.
http://www.tomdoyle.org/satellite/SatTrackerRotor.html
W9KE Tom Doyle
On Fri, Mar 1, 2013 at 1:17 AM, Lizeth Norman <normanlizeth@xxxxx.xxx>wrote:
> Gus and all:
> Had a bad experience with a stepper motor based 3 axis mill project.
> That thing had a mind of it's own. Definitely needed the big red kill
> switch every once in a while.
>
> The choice of a position sensor is as much as what you can get locally
> that meets the need as what will work.
>
> Three turn pots are necessary unless we want to limit rotation to 360
> degrees. Easy enough to in satpc32.
> Also, not all pots rotate 360. Some only 320, some less. The more
> expensive pots have much greater possible feature set. The Arduino
> does not care what we use..
> What sort of position encoders are available in your local surplus
> store? How about available as salvage from other gear??
>
> Am going to Peru towards the end of April. What's available here and
> what's available there are two different things.
> Last time I visited, a few OT's and I had a conversation regarding
> exactly what we have been discussing, namely an inexpensive full
> featured satellite station using mostly homebrew for super cheep.
>
> Norm
>
>
> On Fri, Mar 1, 2013 at 12:29 AM, Gus <8p6sm@xxxx.xxx> wrote:
> > On 02/28/2013 11:24 PM, Lizeth Norman wrote:
> >>
> >> A stepper still needs some sort of position feedback..
> >>
> >>
> > Not really.
> >
> > Steppers rotate a predictable amount with each step. To calibrate, the
> > software only needs to count steps from one limit switch to the other.
> > Then, by keeping track of step count (+/-), it will always know exactly
> how
> > far round the turn it is. It can store last position in NV RAM or
> EEPROM,
> > so as to avoid the need to recalibrate on every startup.
> >
> > Unfortunately, I can't think of a common source for surplus steppers of
> > useful size. And driving them is slightly more complicated than firing a
> > relay to a DC motor.
> >
> >
> > OK, why do we have to use A multi-turn pot? Why not just an ordinary
> linear
> > pot?
> >
> >
> > -- 73, de Gus 8P6SM
> > Barbados, the easternmost isle.
> > _______________________________________________
> > 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.
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--
Sent from my computer.
tom ...
------------------------------
Message: 15
Date: Fri, 1 Mar 2013 14:57:10 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Sites With Live Video Feed Of SpaceX Launch
Message-ID:
<CAP7QzkPbH5QAGe-jiFAc7mS78hJYhNWqF=G8DDcahjq4Wp==DQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
http://www.nasa.gov/multimedia/nasatv/index.html
http://spaceflightnow.com/falcon9/005/status.html
73s
Bernhard VA6BMJ @ Do33FL
------------------------------
Message: 16
Date: Fri, 01 Mar 2013 07:18:54 -0800
From: WA6FWF <wa6fwf@xxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] kpc-9612 plus and online_kiss.exe
Message-ID: <5130C6DE.4070504@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi All
Has anyone got the online_kiss app to work with a kpc-9612 plus?
I have changed the init txt to intface kiss and reset
I have tried putting the tnc into kiss mode before the app starts
I have tried different port speeds matching my tnc setup
And nothing ever shows up, but...
using some other programs I see data coming from the sat on this tnc.
I would like to get this working to make use of the write to file feature.
Thanks 73
Kevin wa6fwf
------------------------------
Message: 17
Date: Fri, 1 Mar 2013 15:51:04 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Possible Problems With Dragon
Message-ID:
<CAP7QzkPXmCJcZoZsxgb01MebOkQTs5Mc8nDQwTb_2QxYaF-BHA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
The launch went smoothly and the spacecraft successfully separated
from the second stage. However, there appear to be difficulties with
its thrusters:
http://www.spaceflightnow.com/falcon9/005/status.html
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
_______________________________________________
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!
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End of AMSAT-BB Digest, Vol 8, Issue 69
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