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CX2SA > SATDIG 07.08.13 21:12l 393 Lines 15352 Bytes #999 (0) @ WW
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Sent: 130807/1910Z @:CX2SA.SAL.URY.SA #:9468 [Salto] FBB7.00e $:AMSATBB8256
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. CN77 (Bob- W7LRD)
2. CN77 effort (Bob- W7LRD)
3. iPhone/iPad Notifications with pseudo SatPC32 WinAOS
(Thomas Doyle)
4. Re: CN77 effort (Andrew Glasbrenner)
5. Non-mechanical Azimuth/Elevation Feedback Advice (Zach Leffke)
6. Re: Non-mechanical Azimuth/Elevation Feedback Advice
(Lizeth Norman)
7. Satellites List (Mineo Wakita)
----------------------------------------------------------------------
Message: 1
Date: Tue, 6 Aug 2013 22:25:17 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] CN77
Message-ID:
<2140459956.1040939.1375827917293.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxx
xxxx.xxx>
Content-Type: text/plain; charset=utf-8
I will be on the 0344Z FO29, then maybe SO50 at 0418.
73 Bob W7LRD/7
CN77
------------------------------
Message: 2
Date: Wed, 7 Aug 2013 05:19:17 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] CN77 effort
Message-ID:
<148454358.1047394.1375852757166.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
I have been hamming since 1961. I had more fun, in in the last two days than
a human is supposed to have. I ran a IC910 to a arrow from the back seat of
my Ford Focus. My effort was a bit primitive but it worked pretty good. FO29
was a good choice, I could only get one qso out of SO-50. John K8YSE wrote
the book on portable operations. I know a couple of you have a recordings. I
will get them eventually. Best dx is Drew KO4MA, from a few hundred feet
from the Pacific Ocean in NW Washington to the East coast of Florida. QSL
cards upon request, I can only do "real" QSL cards, being somewhat digitally
challanged. If I ever do this again I will be better prepared, maybe leave
the xyl, grand daughter, and dogs at home. Check out CN76!
thank you and 73
Bob W7LRD/7
cn77
------------------------------
Message: 3
Date: Wed, 7 Aug 2013 08:37:49 -0500
From: Thomas Doyle <tomdoyle1948@xxxxx.xxx>
To: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] iPhone/iPad Notifications with pseudo SatPC32
WinAOS
Message-ID:
<CAHnRQR+=CKxTFTSRMg20wkmLus11g8voCzz7DGDY0Dx5c5FPjw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
By coincidence this went live on the app store the same day California
started using notifications for Amber Alerts. Even though California was 5
days behind Louisiana the folks in 6 land got all the publicity. I hope
the EBS catches up some day.
Be sure you know how to deal with notifications on your iThing
before trying this.
http://www.tomdoyle.org/satexppro
73 W9KE Tom Doyle
------------------------------
Message: 4
Date: Wed, 7 Aug 2013 09:39:25 -0400 (GMT-04:00)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: Bob- W7LRD <w7lrd@xxxxxxx.xxx>, amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: CN77 effort
Message-ID:
<25917615.1375882765509.JavaMail.root@xxxxxxxxxxxxxxxx.xxx.xx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Roving is addictive, and gets easier with practice. You did great, and I
appreciate the new rare grid. The Pacific NW is tough for me in particular
because a lot of rovers or new grids only show up on the FM birds, and the
range just isn't there since HO-68 quit working. Having mountains on your
end doesn't help either. Fortunately my horizon (well, from my tower) to the
NW is the Gulf of Mexico.
Thanks again Bob!
73, Drew KO4MA
-----Original Message-----
>From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
>Sent: Aug 7, 2013 1:19 AM
>To: amsat-bb@xxxxx.xxx
>Subject: [amsat-bb] CN77 effort
>
>
>
>I have been hamming since 1961. I had more fun, in in the last two days
than a human is supposed to have. I ran a IC910 to a arrow from the back
seat of my Ford Focus. My effort was a bit primitive but it worked pretty
good. FO29 was a good choice, I could only get one qso out of SO-50. John
K8YSE wrote the book on portable operations. I know a couple of you have a
recordings. I will get them eventually. Best dx is Drew KO4MA, from a few
hundred feet from the Pacific Ocean in NW Washington to the East coast of
Florida. QSL cards upon request, I can only do "real" QSL cards, being
somewhat digitally challanged. If I ever do this again I will be better
prepared, maybe leave the xyl, grand daughter, and dogs at home. Check out
CN76!
>
>thank you and 73
>
>Bob W7LRD/7
>
>cn77
>_______________________________________________
>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: Wed, 7 Aug 2013 09:58:26 -0400
From: "Zach Leffke" <zleffke@xx.xxx>
To: "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Non-mechanical Azimuth/Elevation Feedback Advice
Message-ID: <002901ce9376$30988910$91c99b30$@xx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hello Everyone,
I recently came into possession of a Pelco PT170-24P
tracking pan tilt pedestal designed to support large security cameras. My
intent with this new acquisition is to repurpose it as a "low cost" (got it
on Ebay for ~$75 + S&H) alternative for an antenna tracking pedestal for
amateur satellites. It uses 24VAC induction motors to move the azimuth and
elevation assemblies, pretty much just like the G5500s that I'm sure so many
of us are familiar with. It definitely cannot support the same amount of
weight as the G5500, but I'm looking to construct a small, portable
satellite ground station node and this thing is plenty beefy enough to
handle a couple of Arrow style antennas. Here is the problem, it provides
absolutely no feedback.
My question to the group is does anyone know of a non-mechanical method for
getting relatively accurate feedback for azimuth and elevation. I'm looking
for an all electronic means that I can mount somewhere outside of the actual
pedestal assembly (like perhaps on the cross-boom) that will be able to
provide measurement of the az/el (or pan/tilt, or yaw/pitch, whatever you
want to call it) position. I'm using an arduino microcontroller for the
tracking controller. Originally I intended to find a way to mount
potentiometers in inside the unit and simply use the ADCs on the arduino to
read the position feedback voltage from the pots, however, there is barely
enough space to mount an elevation feedback pot inside the unit, and there
is virtually no space for an azimuth feedback pot. Hence I'm looking for a
non-mechanical method.
My first thoughts for the elevation feedback was to use the old
potentiometer plus nice heavy weight method mounted out on the boom. This
idea doesn't appeal to me very much as other factors can now affect the
position feedback (such as high winds). I then thought of something along
the lines of an accelerometer. I also tossed around the idea of a 2-axis
gyro for both Az/El. My issue is I have limited experience working with
these types of sensors, and was hoping to get advice from everyone in this
group. I know for example that the gyro will provide rate of motion around
an axis and thus I have to integrate over time to get the actual position.
This becomes cumbersome because now I have to keep track of time in the
Arduino while executing movement commands (certainly do-able, just more
complicated than reading an ADC voltage). Additionally, I believe these
devices suffer from drift and require frequent calibration (although there
may be a scheme of starting from a known position, say at one of the limit
switch contact points, for each pass that might work). I also toyed with
the idea of an electric compass for azimuth feedback, but I'm worried about
distortion of the magnetic field near the pedestal due to the AC induction
motors or when the antennas are radiating. In theory the motors are housed
inside the metal pedestal enclosure and thus are shielded from the outside
world, but I can just see it now, nice steady feedback when the pedestal is
stopped and as soon as I execute a motion command the azimuth feedback
starts dancing all over the place. Since the motion stop command is based
on achieving the target position, system instability is sure to occur. Even
if I solve the AC motor EMI problem, I still worry that when transmitting
the fields could potentially be distorted if near the antenna (remember my
goal is a compact design) and taint the position feedback.
Any ideas from the group would be greatly appreciated. I'm looking for a
"sparkfun" type solution here and if anyone has experience working with
accelerometers, gyros, electric compasses, etc. I would love your advice on
which might be the way to go for the position feedback. If you think I've
hit on a good idea above and should go with it please let me know. Again
I'm using an Arduino, so analog voltage feedback, I2C, SPI, and UART serial
are all on the table for communicating with the sensors to get the feedback
info.
Thanks in advance!
Sincerely,
Zach, KJ4QLP
------------------------------
Message: 6
Date: Wed, 7 Aug 2013 11:14:15 -0400
From: Lizeth Norman <normanlizeth@xxxxx.xxx>
To: Zach Leffke <zleffke@xx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Non-mechanical Azimuth/Elevation Feedback
Advice
Message-ID:
<CAJUhCTOq=Emt4hTKJKwocZjp3s2kdkX+++oCC1CVZSWmt7PzTw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Zack,
Check out K3NG's Arduino rotator control project. It incorporates the
proper sensors and should, with the proper interface hardware, drive your
hardware.
I'm in the process of a build myself.
Norm n3ykf
On Wed, Aug 7, 2013 at 9:58 AM, Zach Leffke <zleffke@xx.xxx> wrote:
> Hello Everyone,
>
> I recently came into possession of a Pelco PT170-24P
> tracking pan tilt pedestal designed to support large security cameras. My
> intent with this new acquisition is to repurpose it as a "low cost" (got it
> on Ebay for ~$75 + S&H) alternative for an antenna tracking pedestal for
> amateur satellites. It uses 24VAC induction motors to move the azimuth and
> elevation assemblies, pretty much just like the G5500s that I'm sure so
> many
> of us are familiar with. It definitely cannot support the same amount of
> weight as the G5500, but I'm looking to construct a small, portable
> satellite ground station node and this thing is plenty beefy enough to
> handle a couple of Arrow style antennas. Here is the problem, it provides
> absolutely no feedback.
>
>
>
> My question to the group is does anyone know of a non-mechanical method for
> getting relatively accurate feedback for azimuth and elevation. I'm
> looking
> for an all electronic means that I can mount somewhere outside of the
> actual
> pedestal assembly (like perhaps on the cross-boom) that will be able to
> provide measurement of the az/el (or pan/tilt, or yaw/pitch, whatever you
> want to call it) position. I'm using an arduino microcontroller for the
> tracking controller. Originally I intended to find a way to mount
> potentiometers in inside the unit and simply use the ADCs on the arduino to
> read the position feedback voltage from the pots, however, there is barely
> enough space to mount an elevation feedback pot inside the unit, and there
> is virtually no space for an azimuth feedback pot. Hence I'm looking for a
> non-mechanical method.
>
>
>
> My first thoughts for the elevation feedback was to use the old
> potentiometer plus nice heavy weight method mounted out on the boom. This
> idea doesn't appeal to me very much as other factors can now affect the
> position feedback (such as high winds). I then thought of something along
> the lines of an accelerometer. I also tossed around the idea of a 2-axis
> gyro for both Az/El. My issue is I have limited experience working with
> these types of sensors, and was hoping to get advice from everyone in this
> group. I know for example that the gyro will provide rate of motion around
> an axis and thus I have to integrate over time to get the actual position.
> This becomes cumbersome because now I have to keep track of time in the
> Arduino while executing movement commands (certainly do-able, just more
> complicated than reading an ADC voltage). Additionally, I believe these
> devices suffer from drift and require frequent calibration (although there
> may be a scheme of starting from a known position, say at one of the limit
> switch contact points, for each pass that might work). I also toyed with
> the idea of an electric compass for azimuth feedback, but I'm worried about
> distortion of the magnetic field near the pedestal due to the AC induction
> motors or when the antennas are radiating. In theory the motors are housed
> inside the metal pedestal enclosure and thus are shielded from the outside
> world, but I can just see it now, nice steady feedback when the pedestal is
> stopped and as soon as I execute a motion command the azimuth feedback
> starts dancing all over the place. Since the motion stop command is based
> on achieving the target position, system instability is sure to occur.
> Even
> if I solve the AC motor EMI problem, I still worry that when transmitting
> the fields could potentially be distorted if near the antenna (remember my
> goal is a compact design) and taint the position feedback.
>
>
>
> Any ideas from the group would be greatly appreciated. I'm looking for a
> "sparkfun" type solution here and if anyone has experience working with
> accelerometers, gyros, electric compasses, etc. I would love your advice on
> which might be the way to go for the position feedback. If you think I've
> hit on a good idea above and should go with it please let me know. Again
> I'm using an Arduino, so analog voltage feedback, I2C, SPI, and UART serial
> are all on the table for communicating with the sensors to get the feedback
> info.
>
>
>
> Thanks in advance!
>
>
>
> Sincerely,
>
> Zach, KJ4QLP
>
>
>
> _______________________________________________
> 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, 8 Aug 2013 00:42:52 +0900
From: "Mineo Wakita" <ei7m-wkt@xxxxxxxxx.xx.xx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Satellites List
Message-ID: <D79FFB0E6948414B98D2F82F90797472@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-2022-jp";
reply-type=original
Web version, 6 Aug 2013
http://www.ne.jp/asahi/hamradio/je9pel/satslist.htm
Excel version, 6 Aug 2013
http://www.ne.jp/asahi/hamradio/je9pel/satslist.xls
Word version, 19 Jun 2013
http://ukamsat.files.wordpress.com/2012/10/frequencies_of_active_satellites_20
13-06-191.doc
JE9PEL, Mineo Wakita
------------------------------
_______________________________________________
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 8, Issue 256
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