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CX2SA > SATDIG 25.04.08 19:48l 777 Lines 22834 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V3 197
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Sent: 080425/1842Z @:CX2SA.LAV.URY.SA #:63337 [Minas] FBB7.00e $:63337-CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Using an 817 on AO-51 (Angus)
2. O7 23apr08 (Dave Guimont)
3. Tickets to Dayton Banquet (Martha)
4. Delfi-C3 launch date confirmed! (Mark L. Hammond)
5. Thanks for the 817 info (WB2LLP)
6. Dish position pulse counter (Phil)
7. Re: Any PSLV CubeSat Launch Coverage ? (Bryan Klofas)
8. RS-22 not heard (David)
9. Re: RS-22 not heard (Chris Bloy)
10. Re: Dish position pulse counter (Steve harrison)
11. FT817 service manual, repair or parts (Pieter Kotze)
12. Re: Dish position pulse counter (i8cvs)
13. Re: Dish position pulse counter (David Barber)
14. rs-22 (Robert Smith)
15. AMSAT Awards (Bruce)
16. TS-2000X question (i8cvs)
17. Re: Dish position pulse counter (Phelps Williams)
----------------------------------------------------------------------
Message: 1
Date: Thu, 24 Apr 2008 19:59:49 +0100
From: "Angus" <angus(AT)young5769.freeserve.co.uk>
Subject: [amsat-bb] Re: Using an 817 on AO-51
To: <AMSAT-BB(AT)amsat.org>
Message-ID: <330e01c8a63d$616d7b80$bfb74054(AT)ifriend>
Content-Type: text/plain; charset="iso-8859-1"
All my sat QSO's are done with a single FT817 and its no problem with any of
the FM sats, very simple to set up, and any one with the FT817 should use the
FT Commander software for easy setting of the 817 memorys.
regards
Gus M0IKB
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------------------------------
Message: 2
Date: Thu, 24 Apr 2008 12:13:12 -0700
From: Dave Guimont <dguimon1(AT)san.rr.com>
Subject: [amsat-bb] O7 23apr08
To: amsat-bb(AT)amsat.org
Message-ID:
<20080424191315.YMSR5568.cdptpa-omta05.mail.rr.com(AT)Dave.san.rr.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
O7 beacon on 145.972 +/- doppler, S9 signals in San Diego at 1830z....
Mode B loud and clear the entire pass, ~50 watts ERP..
73, Dave, WB6LLO
dguimon1(AT)san.rr.com
Disagree: I learn....
Pulling for P3E...
------------------------------
Message: 3
Date: Thu, 24 Apr 2008 17:42:05 -0400
From: Martha <martha(AT)amsat.org>
Subject: [amsat-bb] Tickets to Dayton Banquet
To: amsat-bb(AT)amsat.org, "Board of Directors" <bod(AT)amsat.org>,
officers(AT)amsat.org
Message-ID:
<956751cf0804241442r233f6d42w23c1d85e0a693eed(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
This is a reminder that you MUST pay for your banquet ticket before May
12th. Giving me your name only will not hold a ticket. I understand it
is difficult since the store is down but you need to call the AMSAT
office. The number is 301-589-6062.
--
73- Martha
------------------------------
Message: 4
Date: Thu, 24 Apr 2008 18:30:58 -0400
From: "Mark L. Hammond" <n8mh(AT)embarqmail.com>
Subject: [amsat-bb] Delfi-C3 launch date confirmed!
To: amsat-bb(AT)amsat.org
Message-ID: <CB.CE.12415.E1A01184(AT)smtp09.embarq.synacor.com>
Content-Type: text/plain; charset="us-ascii"
Just read this:
http://www.delfic3.nl/index.php?option=com_content&task=view&id=96&Itemid=71
"Launch date confirmed
The launch provider has officially announched a launch date and time: April
28th at 03:53 UTC. All clocks are counting down and preparations for the
launch are in progress!"
Congratulations to the team! I bet they are excited beyond belief :)
73,
Mark L. Hammond [N8MH]
------------------------------
Message: 5
Date: Thu, 24 Apr 2008 18:23:49 -0400
From: WB2LLP <wb2llp(AT)optonline.net>
Subject: [amsat-bb] Thanks for the 817 info
To: AMSAT -BB <AMSAT-BB(AT)AMSAT.Org>
Message-ID: <007e01c8a659$de9d4c90$6401a8c0(AT)gene>
Content-Type: text/plain; charset=iso-8859-1
Keith and Ronald,
Thanks for the information and pointers to the information. Normally I use an
IC-W32A in the driveway or front yard and I wanted to try it with the 817
also. I had forgotten about the example on page 77 of the 817 manual. With
all this help, it should be simple.
73 de WB2LLP Gene
------------------------------
Message: 6
Date: Fri, 25 Apr 2008 09:46:52 +1000
From: "Phil" <phillor(AT)telstra.com>
Subject: [amsat-bb] Dish position pulse counter
To: <amsat-bb(AT)amsat.org>
Message-ID: <000901c8a666$b6eadf20$cf8cef0a(AT)Phil>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Thank you for reading this.
While looking for something to do recently, I came across a project that I was
working on four years ago. It's the basis of a PIC controller for a home-built
satellite dish rotator.
It's taken me the better part of a week to figure out what it's all about and
I
now remember one of the problems that slowed the pace of the project. I'm
wondering if it's worth the effort of continuing.
The PIC was counting pulses reasonably well from the elevation jack but was
not
always accurate because of noise pulses from the motor. I expect the larger
azimuth rotator motor will produce even more hash. An accurate pulse count is
important so as not to accumulate a large error towards the end of a satellite
pass. Constant stopping and starting would probably add extra pulses too.
Do home TV dish pointers use shielded cable to take the position pulses back
to
the controller? It's not something that I can test myself because my satellite
gear is in storage more that 1100km from where I live.
I'm having second thoughts about the pulse counting scheme and I'm beginning
to
think that the tried and proven ten-turn pot method might be more fool proof.
Has anyone else had any success, or otherwise, with pulse counting? It's an
interesting project but it might be impractical.
Regards,
Phil.
------------------------------
Message: 7
Date: Thu, 24 Apr 2008 17:43:54 -0700
From: Bryan Klofas <bklofas(AT)calpoly.edu>
Subject: [amsat-bb] Re: Any PSLV CubeSat Launch Coverage ?
To: amsat-bb(AT)amsat.org
Message-ID: <4811294A.4040909(AT)calpoly.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hey Keith--
I haven't heard anything about live internet coverage, but I know we
will be on IRC for the before, during and after the launch, and during
the passes at Cal Poly. #cubesat on irc.freenode.net
Or, for those of you without an IRC client, you can use the web client
on the Polysat site:
http://polysat.calpoly.edu/irc/
(it has trouble when more than 10 people use it though, so try getting a
real IRC client).
--
Bryan Klofas, KF6ZEO
Cal Poly State University
Keith N4ZQ wrote:
> To anyone in the know, is there going to be any live Internet coverage of
the PSLV CubeSat Launch in a few days? Maybe a live web cast or at least an
IRC chat room? I would appreciate the URL if there is any. Cal Poly has had
great success with it's chat room during their pre launch, launch and post
launch activities.
>
> Keith N4ZQ
>
>
>
>
>
>
>
>
>
>
> _____________________________________________________________
> Click here to find answers for Love, Problems, and what your Future holds.
>
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IDpI8TD0RSrEWKzHPRTP7Wd/
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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------------------------------
Message: 8
Date: Fri, 25 Apr 2008 10:41:48 +0930
From: David <vk5dg(AT)aapt.net.au>
Subject: [amsat-bb] RS-22 not heard
To: amsat-bb(AT)amsat.org
Message-ID: <200804251041.48164.vk5dg(AT)aapt.net.au>
Content-Type: text/plain; charset="us-ascii"
Hello All,
Just had a listen for RS-22 on 435.352 but didn't hear anything. Anyone know
of its current status?
73 de David VK5DG
------------------------------
Message: 9
Date: Fri, 25 Apr 2008 06:44:33 +0100
From: "Chris Bloy" <chris(AT)photofuture.co.uk>
Subject: [amsat-bb] Re: RS-22 not heard
To: "David" <vk5dg(AT)aapt.net.au>
Cc: amsat-bb(AT)amsat.org
Message-ID: <WorldClient-F200804250644.AA44330003(AT)photofuture.co.uk>
Content-Type: text/plain; charset=us-ascii
Hi David,
RS-22 is still active and sending telem, however, its batteries are getting
low and unable to transmit under eclipes conditions.
It was heard yesterday, but with many resets (starts telem CW but ends with
a long tone) due to bad solar position (UBS=10.4v USUN=8.8v).
Hope that helps.
Chris
-----Original Message-----
From: David <vk5dg(AT)aapt.net.au>
To: amsat-bb(AT)amsat.org
Date: Fri, 25 Apr 2008 10:41:48 +0930
Subject: [amsat-bb] RS-22 not heard
Hello All,
Just had a listen for RS-22 on 435.352 but didn't hear anything. Anyone
know
of its current status?
73 de David VK5DG
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. 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: 10
Date: Fri, 25 Apr 2008 12:13:24 +1000
From: "Steve harrison" <steve(AT)innovative-research.com.au>
Subject: [amsat-bb] Re: Dish position pulse counter
To: <amsat-bb(AT)amsat.org>
Message-ID: <000601c8a679$f20003c0$0301a8c0(AT)bojangles>
Content-Type: text/plain; charset="iso-8859-1"
Hi Phil,
Just a thought regarding pulse counting of the jack (Actuator arm). Feed DC to
the reed switch and then detect it with an opto coupler with the appropriate
series resistor. Then count the pulses from the output transistor of the opto-
coupler. This will stop the false counts from noise etc.
I would be very interested in your results with this project as pulse counting
has lots of merit as an accurate position sensor.
Regards,
Steve. VK2XDE
------------------------------
Message: 11
Date: Fri, 25 Apr 2008 08:47:39 +0200
From: "Pieter Kotze" <PKotze(AT)csir.co.za>
Subject: [amsat-bb] FT817 service manual, repair or parts
To: <amsat-bb(AT)amsat.org>
Message-ID: <48119AAB.A154.0020.0(AT)csir.co.za>
Content-Type: text/plain; charset=US-ASCII
Hello all
Managed to kill my 817 some time ago with a power spike from a dodgy power
supply. Found some burnt components and tracks on the main board next to the
ribbon cable leading to the front panel and LCD. This prevented the 12V from
reaching the front panel. Did a small mod to get the 12V around this burnt
track. Still no switch on from the 817. Then found another burnt component,
the 5V regulator next to the power switch on the front panel PCB. Temporary
replaced the 5v surface mount with a 7805 regulator, but still no joy.
Beginning to think that a lot more must have been damaged by the power spike.
Anyone out there got more of a service manual to try and track the fault?
Otherwise anyone got an 817 that has damage elsewhere from which I could try
and swop subparts / PCB to get mine working again?
Regards
Pieter
ZS1PK
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------------------------------
Message: 12
Date: Fri, 25 Apr 2008 12:11:28 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: Dish position pulse counter
To: "Phil" <phillor(AT)telstra.com>, "AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID: <002101c8a6bc$ba55b260$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Phil" <phillor(AT)telstra.com>
To: <amsat-bb(AT)amsat.org>
Sent: Friday, April 25, 2008 1:46 AM
Subject: [amsat-bb] Dish position pulse counter
> Thank you for reading this.
>
>
> I'm having second thoughts about the pulse counting scheme and I'm
> beginning to think that the tried and proven ten-turn pot method might
> be more fool proof.
> Regards,
> Phil.
Hi Phil
The ten-turn pot method is also not immune from inaccuracy when the
voltage across the pot is close to 0 volt i.e. when the rotator is turned
near to 0 degrees elevation.
In this condition the noise voltage picked up by the cable running from the
antenna to the control box can add with the low voltage available across the
potentiometer.
Since you are able to write a program for a PIC a better method to get in
general a high pointing accuracy requested for a dish and expecially for a
big dish is to use different type of position sensors like the following:
Sequential encoders
Absolute encoders
Selsyn or Resolvers
With two inexpensive surplus selsyn for the azimuth and two selsyn
for the elevation on my dish I actually get a very accurate indication
of position on mechanical pointers but adding the Analog Device chip
AD2S80 I plan to write a program to get both precise digital indication
and automatic tracking with high accuracy
Look on google for the AD2S80 data sheet and for many technical
applications of it with syncro-resolvers.
Have fun
73" de
i8CVS Domenico
------------------------------
Message: 13
Date: Fri, 25 Apr 2008 11:29:19 +0100
From: "David Barber" <david.barber(AT)dbelectronics.co.uk>
Subject: [amsat-bb] Re: Dish position pulse counter
To: "'AMSAT-BB'" <amsat-bb(AT)amsat.org>
Message-ID: <007001c8a6bf$39032190$6401a8c0(AT)DBXPPPOR>
Content-Type: text/plain; charset="us-ascii"
If pulse counting is used and since presumably the duration and expected
repetition of the pulse is known / can be calculated is it not possible to
discriminate between noise and a valid pulse?
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of i8cvs
Sent: 25 April 2008 11:11
To: Phil; AMSAT-BB
Subject: [amsat-bb] Re: Dish position pulse counter
----- Original Message -----
From: "Phil" <phillor(AT)telstra.com>
To: <amsat-bb(AT)amsat.org>
Sent: Friday, April 25, 2008 1:46 AM
Subject: [amsat-bb] Dish position pulse counter
> Thank you for reading this.
>
>
> I'm having second thoughts about the pulse counting scheme and I'm
> beginning to think that the tried and proven ten-turn pot method might
> be more fool proof.
> Regards,
> Phil.
Hi Phil
The ten-turn pot method is also not immune from inaccuracy when the
voltage across the pot is close to 0 volt i.e. when the rotator is turned
near to 0 degrees elevation.
In this condition the noise voltage picked up by the cable running from the
antenna to the control box can add with the low voltage available across the
potentiometer.
Since you are able to write a program for a PIC a better method to get in
general a high pointing accuracy requested for a dish and expecially for a
big dish is to use different type of position sensors like the following:
Sequential encoders
Absolute encoders
Selsyn or Resolvers
With two inexpensive surplus selsyn for the azimuth and two selsyn
for the elevation on my dish I actually get a very accurate indication
of position on mechanical pointers but adding the Analog Device chip
AD2S80 I plan to write a program to get both precise digital indication
and automatic tracking with high accuracy
Look on google for the AD2S80 data sheet and for many technical
applications of it with syncro-resolvers.
Have fun
73" de
i8CVS Domenico
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. 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: 14
Date: Thu, 24 Apr 2008 23:08:31 -1000
From: "Robert Smith" <dukenuke(AT)pixi.com>
Subject: [amsat-bb] rs-22
To: "Amsat-Bb(AT)Amsat. Org" <amsat-bb(AT)amsat.org>
Message-ID: <000c01c8a6b3$f00ba170$2f01a8c0(AT)HPOWER>
Content-Type: text/plain; charset="iso-8859-1"
Aloha All
I have copied RS-22 off and on over the last year.
About the same time I read the AMSAT postings re:
battery loss etc., I fired up SATPC32 and saw
that the bird was almost directly overhead Honolulu
(my QTH). I ran outside with my HT and Arrow and
received a strong distinct signal. The time was
0833Z (1030p Honolulu time). Accordingly, although
the sat. may be experiencing difficulties she was
"op normal" under eclipse conditions this evening.
My curiousity is now up however and I listen more
frequently over the next several days. Aloha from
Honolulu.
robert NH7WN
------------------------------
Message: 15
Date: Fri, 25 Apr 2008 11:29:13 -0500
From: Bruce <kk5do(AT)arrl.net>
Subject: [amsat-bb] AMSAT Awards
To: amsat-bb(AT)amsat.org
Message-ID: <481206D9.2070601(AT)arrl.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
We would like to welcome the following to the satellite community.
They have made their first satellite contact and are now members of the
AMSAT Satellite Communicators Club.
University of Florida, Gator Amateur Radio Club, W4DFU
The following have earned the AMSAT Sattelite Communications Achievement Award
Clyde de Rossett, KI4CKT #462
University of Florida, Gator Amateur Radio Club, W4DFU #463
The following have earned the AMSAT South Africa Satellite Communications
Achievement Award
Dimitrios Pallis, SW1JGW #US120
University of Florida, Gator Amateur Radio Club, W4DFU #US121
To see all the awards visit http://www.amsat.org or
http://www.amsatnet.com
Bruce Paige, KK5DO
AMSAT Director Contests and Awards
ARRL Awards Manager (WAS, 5BWAS, VUCC), VE
--
Bruce Paige, KK5DO
AMSAT Director Contests and Awards
ARRL Awards Manager (WAS, 5BWAS, VUCC), VE
Houston AMSAT Net - Wed 0100z on SkyScanner Satellite Radio Network on Galaxy-
25 (AT)97? West,
Transponder 23 (12115 Vert), Symbol Rate: 22425, APID: 1794 (DVB Free To Air)
Also streaming MP3 at http://www.amsatnet.com
Podcast at http://www.amsatnet.com/podcast.xml or iTunes
Latest satellite news on the ARRL Audio News
http://www.arrl.org
------------------------------
Message: 16
Date: Fri, 25 Apr 2008 20:36:53 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] TS-2000X question
To: "AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID: <003a01c8a703$55d19c40$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
Hi All,
I got advise that the quality of modulation on 23 cm for the
TS-2000X in SSB is not so good as in 2 meters and 70 cm.
Any experience ?
Tanks and 73" de
i8CVS Domenico
------------------------------
Message: 17
Date: Fri, 25 Apr 2008 13:13:25 -0400
From: "Phelps Williams" <phelpsw(AT)gmail.com>
Subject: [amsat-bb] Re: Dish position pulse counter
To: david.barber(AT)dbelectronics.co.uk
Cc: AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID:
<685b25860804251013t40709f7cm1c85960e1b9ccd18(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Phil,
Have you identified the source of the noise? However you regulate down the
5v for the pic, if you place a larger capacitor on the 5v regulated bus
(between 5v and gnd) this might help with these fluctuations, essentially
acting as a high pass filter.
If the power bus is clean, the noise might be induced along a long cable run
to the rotor itself. It might be worthwhile to look at a differential a2d
with a spi or i2c interface.
Take a look at the Texas Instruments ADS1110. It has an internal reference
voltage as well to help filter out these ratiometric effects.
Another option might be to switch over to a rs485 or rs422 link between the
rotor and your shack where the controller presumably is.
-Phelps
KI6GST
On Fri, Apr 25, 2008 at 6:29 AM, David Barber <
david.barber(AT)dbelectronics.co.uk> wrote:
> If pulse counting is used and since presumably the duration and expected
> repetition of the pulse is known / can be calculated is it not possible to
> discriminate between noise and a valid pulse?
>
>
>
> -----Original Message-----
> From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org]
On
> Behalf Of i8cvs
> Sent: 25 April 2008 11:11
> To: Phil; AMSAT-BB
> Subject: [amsat-bb] Re: Dish position pulse counter
>
> ----- Original Message -----
> From: "Phil" <phillor(AT)telstra.com>
> To: <amsat-bb(AT)amsat.org>
> Sent: Friday, April 25, 2008 1:46 AM
> Subject: [amsat-bb] Dish position pulse counter
>
> > Thank you for reading this.
> >
> >
> > I'm having second thoughts about the pulse counting scheme and I'm
> > beginning to think that the tried and proven ten-turn pot method might
> > be more fool proof.
> > Regards,
>
> > Phil.
>
> Hi Phil
>
> The ten-turn pot method is also not immune from inaccuracy when the
> voltage across the pot is close to 0 volt i.e. when the rotator is turned
> near to 0 degrees elevation.
> In this condition the noise voltage picked up by the cable running from
> the
> antenna to the control box can add with the low voltage available across
> the
> potentiometer.
> Since you are able to write a program for a PIC a better method to get in
> general a high pointing accuracy requested for a dish and expecially for a
> big dish is to use different type of position sensors like the following:
>
> Sequential encoders
> Absolute encoders
> Selsyn or Resolvers
>
> With two inexpensive surplus selsyn for the azimuth and two selsyn
> for the elevation on my dish I actually get a very accurate indication
> of position on mechanical pointers but adding the Analog Device chip
> AD2S80 I plan to write a program to get both precise digital indication
> and automatic tracking with high accuracy
>
> Look on google for the AD2S80 data sheet and for many technical
> applications of it with syncro-resolvers.
>
> Have fun
>
> 73" de
>
> i8CVS Domenico
>
>
>
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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(AT)amsat.org. 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(AT)amsat.org. 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 3, Issue 197
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