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CX2SA > SATDIG 05.11.09 22:05l 542 Lines 17586 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. ISS frequencies (Tim Goodrich)
2. Antenna Circularity Switch Relays (Roy)
3. Re: Please help me design a polarity switcher... (Greg D.)
4. Re: ISS frequencies (Sil - ZL2CIA)
5. Re: ISS frequencies (Andrew Rich)
6. Re: video: satellite power-saving through on-board tracking
(Nick Pugh K5QXJ)
7. YouTube on satellite power management (Alan P. Biddle)
8. Re: YouTube on satellite power management (Andrew Rich)
9. Re: ISS frequencies
(Ransom, Kenneth G. (JSC-OC)[BARRIOS TECHNOLOGY])
10. Re: YouTube on satellite power management (Bruce Robertson)
11. News from W6FOG (David Wing)
----------------------------------------------------------------------
Message: 1
Date: Wed, 4 Nov 2009 20:11:01 -0800
From: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] ISS frequencies
To: <amsat-bb@xxxxx.xxx>
Message-ID: <007f01ca5dcd$fca79380$f5f6ba80$@xxx>
Content-Type: text/plain; charset="us-ascii"
What is the best way to determine what frequencies are operational for ISS?
I have a list of them all, but I noticed on issfanclub.com that it says only
one is operational at a time. By the way, this site is supposed to answer my
question, but from what I can tell, it doesn't appear to be updated much.
Also, I listened for activity on the 1945 PST pass, but didn't hear
anything- not even the beacon.
Tim
KI6VBY
------------------------------
Message: 2
Date: Thu, 05 Nov 2009 04:22:13 +0000
From: Roy <rdwelch@xxxxxx.xxx>
Subject: [amsat-bb] Antenna Circularity Switch Relays
To: AMSAT BBS <amsat-bb@xxxxx.xxx>
Message-ID: <4AF252F5.8080805@xxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Re antenna circularity switch relays. I don't know who asked the question but
KLM used Guardian 1365 series relays. They are small in a plastic housing
but they are regular DPDT relays. They are used in both the 70cm and 2M
versions of their antennas.
--
Roy -- W0SL
------------------------------
Message: 3
Date: Wed, 4 Nov 2009 20:32:05 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Please help me design a polarity switcher...
To: <elanportnoy@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <BLU133-W24145E6D9BBFF30DCD5048A9B00@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Elan,
The trick with doing circular polarization is the phasing of the two sets of
elements. Unless your two runs between the shack and the antennas are
exactly the same length, and out of the same cable (for velocity factor
matching), you're never going to get the result you want.
Others have posted information about the switching part; is there any way
you can put that up on the tower?
Greg KO6TH
> Date: Tue, 3 Nov 2009 21:24:59 -0800
> From: elanportnoy@xxxxx.xxx
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Please help me design a polarity switcher...
>
> I have both vertical and horizontal elements of my 70cm yagi coming into
the shack via separate runs of LM400. They meet in a box with bits of coax
for matching and phasing before going to the radio.
>
> I would like to add a relay to make polarity changes quick and easy. Do I
need to use a specific type of relay or will a garden variety DPDT from
Radio Shack be sufficient?
>
> Thanks,
> Elan WB2IOL
> _______________________________________________
> 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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------------------------------
Message: 4
Date: Thu, 05 Nov 2009 18:04:59 +1200
From: Sil - ZL2CIA <zl2cia@xxxxx.xxx>
Subject: [amsat-bb] Re: ISS frequencies
To: amsat-bb@xxxxx.xxx
Message-ID: <4AF26B0B.80605@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Tim Goodrich wrote:
> What is the best way to determine what frequencies are operational for ISS?
> I have a list of them all, but I noticed on issfanclub.com that it says only
> one is operational at a time. By the way, this site is supposed to answer my
> question, but from what I can tell, it doesn't appear to be updated much.
> Also, I listened for activity on the 1945 PST pass, but didn't hear
> anything- not even the beacon.
>
>
>
> Tim
>
> KI6VBY
>
Hi Tim,
I'm not sure what 1945 PST is in UT, but I heard the ISS today at 11:44
NZ summer time (22:44 4 Nov UT) and 1323 NZST (0023 5 Nov UT).
The digipeater was active on 145.825 MHz.
I find the only reliable way of determining the operating frequency is
to listen. That said, packet is now almost always heard on 145.825 MHz.
If it isn't, it usually means the gear is turned off, but it can mean
that that other modes are active, and it's worth tuning around the
likely frequencies.
The site www.ariss.net shows that the ISS gear is currently active in
the digipeater mode.
Sil - ZL2CIA
------------------------------
Message: 5
Date: Thu, 5 Nov 2009 16:26:00 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: ISS frequencies
To: "Sil - ZL2CIA" <zl2cia@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <4D4E58887A294D80ABCFC19A2E996ED7@xxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
http://vk4tec.no-ip.org/sat_status/
----- Original Message -----
From: "Sil - ZL2CIA" <zl2cia@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, November 05, 2009 4:04 PM
Subject: [amsat-bb] Re: ISS frequencies
> Tim Goodrich wrote:
>> What is the best way to determine what frequencies are operational for
>> ISS?
>> I have a list of them all, but I noticed on issfanclub.com that it says
>> only
>> one is operational at a time. By the way, this site is supposed to answer
>> my
>> question, but from what I can tell, it doesn't appear to be updated much.
>> Also, I listened for activity on the 1945 PST pass, but didn't hear
>> anything- not even the beacon.
>>
>>
>>
>> Tim
>>
>> KI6VBY
>>
> Hi Tim,
>
> I'm not sure what 1945 PST is in UT, but I heard the ISS today at 11:44
> NZ summer time (22:44 4 Nov UT) and 1323 NZST (0023 5 Nov UT).
> The digipeater was active on 145.825 MHz.
>
> I find the only reliable way of determining the operating frequency is
> to listen. That said, packet is now almost always heard on 145.825 MHz.
> If it isn't, it usually means the gear is turned off, but it can mean
> that that other modes are active, and it's worth tuning around the
> likely frequencies.
>
> The site www.ariss.net shows that the ISS gear is currently active in
> the digipeater mode.
>
> Sil - ZL2CIA
>
> _______________________________________________
> 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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19:51:00
------------------------------
Message: 6
Date: Thu, 5 Nov 2009 06:16:07 -0600
From: "Nick Pugh K5QXJ" <quadpugh@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: video: satellite power-saving through on-board
tracking
To: "'Bruce Robertson'" <ve9qrp@xxxxx.xxx>, "'AMSAT-BB'"
<amsat-bb@xxxxx.xxx>
Message-ID: <000001ca5e11$c13d5e80$43b81b80$@xxx>
Content-Type: text/plain; charset="us-ascii"
This is very informative I will pase it on to the CAPE team
nick
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Bruce Robertson
Sent: Wednesday, November 04, 2009 10:43 AM
To: AMSAT-BB
Subject: [amsat-bb] video: satellite power-saving through on-board tracking
In a further exploration of the use of the Plan 13 algorithm in Atmel
(or similar) micro-controllers, I've posted a youtube video and
related text that suggests how an amateur satellite could use such a
device on board to change its mode based on its location over the
earth.
http://sites.google.com/site/qrptracker/applications/modeswitcher/
The video includes a sped-up night-long tracking session, some current
consumption testing on the bench and a calculation of the power
budget, which show that even for birds transmitting in the tens of
milliwatts, this approach can provide about a 14% improvement in power
budget.
73, Bruce
http://ve9qrp.blogspot.com/
_______________________________________________
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, 5 Nov 2009 06:40:34 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] YouTube on satellite power management
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <F81153471F9D4C5180A57554B20E4C45@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
There is a very interesting video on management of a satellite so as not to
waste energy transmitting "to whales and penguins." Not new, but a good
discussion of the concept and implementation.
http://www.southgatearc.org/news/november2009/satellite_power_saving.htm
Alan
WA4SCA
------------------------------
Message: 8
Date: Thu, 5 Nov 2009 22:51:48 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: YouTube on satellite power management
To: <APBIDDLE@xxxxxxx.xxx>, "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <77E547894F6F4A22BF33E953471A9139@xxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Haven't they perfected perpetual motion yet ?
----- Original Message -----
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Sent: Thursday, November 05, 2009 10:40 PM
Subject: [amsat-bb] YouTube on satellite power management
> There is a very interesting video on management of a satellite so as not
> to
> waste energy transmitting "to whales and penguins." Not new, but a good
> discussion of the concept and implementation.
>
> http://www.southgatearc.org/news/november2009/satellite_power_saving.htm
>
>
> Alan
> WA4SCA
>
>
> _______________________________________________
> 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
------------------------------------------------------------------------------
--
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.424 / Virus Database: 270.14.50/2481 - Release Date: 11/04/09
19:51:00
------------------------------
Message: 9
Date: Thu, 5 Nov 2009 07:12:52 -0600
From: "Ransom, Kenneth G. (JSC-OC)[BARRIOS TECHNOLOGY]"
<kenneth.g.ransom@xxxx.xxx>
Subject: [amsat-bb] Re: ISS frequencies
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>, Tim Goodrich
<tim@xxxxxxxxxxx.xxx>
Message-ID:
<CBB2346C58D9B14983E5AEFE4B3458867BF1361A23@xxxxxxxxx.xxx.xxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
At 0445 UTC (1945 PST) the ISS was off the East coast of Africa. Might check
your tracking program against a few others to verify its accuracy.
This one is usually a good site to check against.
http://spaceflight.nasa.gov/realdata/tracking/index.html
Kenneth - N5VHO
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Sil - ZL2CIA
Sent: Thursday, November 05, 2009 12:05 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: ISS frequencies
Tim Goodrich wrote:
> What is the best way to determine what frequencies are operational for ISS?
> I have a list of them all, but I noticed on issfanclub.com that it says only
> one is operational at a time. By the way, this site is supposed to answer my
> question, but from what I can tell, it doesn't appear to be updated much.
> Also, I listened for activity on the 1945 PST pass, but didn't hear
> anything- not even the beacon.
>
>
>
> Tim
>
> KI6VBY
>
Hi Tim,
I'm not sure what 1945 PST is in UT, but I heard the ISS today at 11:44
NZ summer time (22:44 4 Nov UT) and 1323 NZST (0023 5 Nov UT).
The digipeater was active on 145.825 MHz.
I find the only reliable way of determining the operating frequency is
to listen. That said, packet is now almost always heard on 145.825 MHz.
If it isn't, it usually means the gear is turned off, but it can mean
that that other modes are active, and it's worth tuning around the
likely frequencies.
The site www.ariss.net shows that the ISS gear is currently active in
the digipeater mode.
Sil - ZL2CIA
_______________________________________________
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: 10
Date: Thu, 5 Nov 2009 12:41:03 -0400
From: Bruce Robertson <ve9qrp@xxxxx.xxx>
Subject: [amsat-bb] Re: YouTube on satellite power management
To: APBIDDLE@xxxxxxx.xxxx AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<49657a760911050841r7e8fc1f1u1fa996b31f0421ca@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
On Thu, Nov 5, 2009 at 8:40 AM, Alan P. Biddle <APBIDDLE@xxxxxx.xxx> wrote:
> There is a very interesting video on management of a satellite so as not to
> waste energy transmitting "to whales and penguins." ?Not new, but a good
> discussion of the concept and implementation.
>
> http://www.southgatearc.org/news/november2009/satellite_power_saving.htm
>
>
> Alan
> WA4SCA
>
Thanks, Alan --
I'd like to include notes on previous implementations of this idea in
the website, but as a hobbyist, I wasn't able to find info on this.
I'd appreciate any institutional memory folks can offer.
Also, not mentioned in the video is just how easy it is for people to
play with these ideas on their own.
The underlying Plan13 library, as well as the one that stores
keplerian elements in EEPROM, are featured in this video
http://sites.google.com/site/qrptracker/ , at 1:33, we see the
micro-controller run a demo, which is a Predict look-alike.
All the code is open source, published at
http://code.google.com/p/qrptracker/ This is a SVN server, and I'd be
happy to welcome people who'd like write access.
On the hardware side, an Arduino that will run this code (and leave
half of its programming space for further ideas) is available for $20
- $30!
You can't go wrong with this model
http://www.sparkfun.com/commerce/product_info.php?products_id=666
but if you think eventually you'd like to go to a breadboard set-up or
a mini model (which fits nicely in an altoids box so you can hack on
this during your commute :-), I recommend that the USB bridge be
implemented off-board. Just be sure to get an arduino with an
ATMega328 processor. The ATMega168's 16k of program space just isn't
enough to store Plan 13 and do anything with it; whereas, the 328
leaves lots of space, even for a small operating system
http://robotgroup.com.ar/noticias/20091102/duinos-sistema-operativo-multitarea
-para-arduino
None of this is meant to be an argument in an Atmel vs. Microchip
debate, since other considerations come into play in the final
hardware choice for inflight micro-controllers. But with C++ libraries
and (pretty well) C code, experiments in this context will be pretty
portable.
Have fun & 73,
Bruce
http://ve9qrp.blogspot.com/
------------------------------
Message: 11
Date: Thu, 5 Nov 2009 10:33:37 -0800
From: "David Wing" <david@xxxxxx.xxx>
Subject: [amsat-bb] News from W6FOG
To: <amsat-bb@xxxxx.xxx>
Message-ID: <BE18AB3E55784CF9B24DA42B5DE990C2@xxxxx>
Content-Type: text/plain; charset="us-ascii"
I just finished a short QSO with Neil W6FOG on VO-52. He did confirm that
when he attempted to start his sailing trip he ran into very bad weather and
after 16 hours of high seas and rain, he had to call the Coast Guard to come
get him and tow him in as he was suffering from hypothermia. The tow broke
3 times on the way in as conditions were quite bad.
At any rate he is hoping to start out again this coming weekend on Saturday
or Sunday.
Please keep in mind that I am only relating conversations I have with Neil
on the air.I have no other contact with him and am in the dark about things
just as much as everyone else sometimes. Please post comments on the -bb
whenever you contact Neil on his trip.everyone is interested in the latest
from him as he makes his way from San Francisco (CM87) through the Panama
Canal to the Caribbean.
73
David
K6CDW
------------------------------
_______________________________________________
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 4, Issue 587
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