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CX2SA > SATDIG 28.09.09 17:17l 1061 Lines 38220 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: All Satellites (William Leijenaar)
2. Re: All Satellites (Andrew Rich)
3. Re: All Satellites (Bruce Robertson)
4. Symposium Restaurant Locations (Frank H. Bauer)
5. Re: FO-29 Operation (WILLIAMS MICHAEL)
6. Re: All Satellites (Kai Gunter Brandt)
7. Re: Satellite Orbit Prediction in Python (Josh Smith)
8. Re: Satellite Orbit Prediction in Python (Joseph Armbruster)
9. Re: FO-29 Operation (Nigel Gunn G8IFF/W8IFF)
10. Re: keps (Nigel Gunn G8IFF/W8IFF)
11. HamSat iPhone App (Bob Cutter)
12. Re: Sumbandila blog (Luc Leblanc)
13. Re: Symposium Restaurant Locations (Pughkeithd@xx.xxxx
----------------------------------------------------------------------
Message: 1
Date: Mon, 28 Sep 2009 03:04:55 -0700 (PDT)
From: William Leijenaar <pe1rah@xxxxx.xxx>
Subject: [amsat-bb] Re: All Satellites
To: amsat-bb@xxxxx.xxx
Message-ID: <130279.67038.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Hello AMSATs,
?
I agree that APRS can have a?higher power transmittter, because of its small
amount of time to get the data broadcasted. However the workability with the
HT and whipe antenna?is only an advantage for the downlink. For the uplink
there will be no advantage.
?
Personally I?believe that making a satellite easier accessable will also
decrease?its?functional efficiency.?This is especially the case for
satellites with limited user access, like single channel FM satellites. This
also includes APRS. The same issue is valide for a geostationary satellite,
with the addition that a geostationary satellite would be overloaded in
short time by more and more stronger stations as fixed antennas can be used.
Only the uplink power level would be the parameter of "competition".
Resulting in a privat chat satellite for only few (high power) users.
?
Satellites for emergency communication sounds very interresting, and
personally I believe it can give a great advantage when doing it well. The
question is only what will work well in an emergency situation. It will
depend on the needs and the availability of?equipment in the effected
area.?I?believe that digital communication will be of limited use as you
need also a computer, modem, keyboard, screen, software?etc besides your
radio. Only one thing missing and you will not be "heared". I don't say it
is impossible, but to make the system?work the ground stations need to be
made more easier somehow.?Maybe HT APRS in combination with voice to text
conversion (and opposite) would be an idea ?
?
Besides the technical difficulty there is also the (human) organising
factor. I heared some ideas about an easy to access?geostationary satellite
with high power downlink. That would be great, but without any
communication?control it would be like the FM LEOs where everyone talks at
the same time and nobody is able to?get there message through.
It?might be solved with a central control centre on a safe place (maybe?by
the?Amateur Radio Emergency Service ?) that?has control over the satellite
radio and uses?it as?a remote radio "ear" in space. In this way it is also
possible to use one frequency simplex system.
?
Just some?ideas,
?
73 de PE1RAH,
William Leijenaar
---
------------------------------
Message: 2
Date: Mon, 28 Sep 2009 20:29:05 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: All Satellites
To: "William Leijenaar" <pe1rah@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <3CE136718CF34297A4323B32D4D38D59@xxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I am playing with RF modules that take ms to send not seconds
19k2
LPRS
----------------------------------------------------------
Andrew Rich
Airways Technical Officer Grade 4
Surveillance - RADAR ADS-B
Amateur Radio Callsign VK4TEC
email: vk4tec@xxxxxxxxxxxxx.xxx
web: www.tech-software.net
----- Original Message -----
From: "William Leijenaar" <pe1rah@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Monday, September 28, 2009 8:04 PM
Subject: [amsat-bb] Re: All Satellites
Hello AMSATs,
I agree that APRS can have a higher power transmittter, because of its small
amount of time to get the data broadcasted. However the workability with the
HT and whipe antenna is only an advantage for the downlink. For the uplink
there will be no advantage.
Personally I believe that making a satellite easier accessable will also
decrease its functional efficiency. This is especially the case for
satellites with limited user access, like single channel FM satellites. This
also includes APRS. The same issue is valide for a geostationary satellite,
with the addition that a geostationary satellite would be overloaded in
short time by more and more stronger stations as fixed antennas can be used.
Only the uplink power level would be the parameter of "competition".
Resulting in a privat chat satellite for only few (high power) users.
Satellites for emergency communication sounds very interresting, and
personally I believe it can give a great advantage when doing it well. The
question is only what will work well in an emergency situation. It will
depend on the needs and the availability of equipment in the effected area.
I believe that digital communication will be of limited use as you need also
a computer, modem, keyboard, screen, software etc besides your radio. Only
one thing missing and you will not be "heared". I don't say it is
impossible, but to make the system work the ground stations need to be made
more easier somehow. Maybe HT APRS in combination with voice to text
conversion (and opposite) would be an idea ?
Besides the technical difficulty there is also the (human) organising
factor. I heared some ideas about an easy to access geostationary satellite
with high power downlink. That would be great, but without any communication
control it would be like the FM LEOs where everyone talks at the same time
and nobody is able to get there message through.
It might be solved with a central control centre on a safe place (maybe by
the Amateur Radio Emergency Service ?) that has control over the satellite
radio and uses it as a remote radio "ear" in space. In this way it is also
possible to use one frequency simplex system.
Just some ideas,
73 de PE1RAH,
William Leijenaar
---
_______________________________________________
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: 3
Date: Mon, 28 Sep 2009 08:54:43 -0300
From: Bruce Robertson <ve9qrp@xxxxx.xxx>
Subject: [amsat-bb] Re: All Satellites
To: William Leijenaar <pe1rah@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<49657a760909280454j2cb0f7efu43b18e315a11f123@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
On Mon, Sep 28, 2009 at 7:04 AM, William Leijenaar <pe1rah@xxxxx.xxx> wrote:
> Hello AMSATs,
>
> I agree that APRS can have a?higher power transmittter, because of its
small amount of time to get the data broadcasted. However the workability
with the HT and whipe antenna?is only an advantage for the downlink. For the
uplink there will be no advantage.
> Personally I?believe that making a satellite easier accessable will also
decrease?its?functional efficiency.?This is especially the case for
satellites with limited user access, like single channel FM satellites. This
also includes APRS. The same issue is valide for a geostationary satellite,
with the addition that a geostationary satellite would be overloaded in
short time by more and more stronger stations as fixed antennas can be used.
Only the uplink power level would be the parameter of "competition".
Resulting in a privat chat satellite for only few (high power) users.
> Satellites for emergency communication sounds very interresting, and
personally I believe it can give a great advantage when doing it well. The
question is only what will work well in an emergency situation. It will
depend on the needs and the availability of?equipment in the effected
area.?I?believe that digital communication will be of limited use as you
need also a computer, modem, keyboard, screen, software?etc besides your
radio. Only one thing missing and you will not be "heared". I don't say it
is impossible, but to make the system?work the ground stations need to be
made more easier somehow.?Maybe HT APRS in combination with voice to text
conversion (and opposite) would be an idea ?
In some cases, the groundstation situation might not be as complicated
as you describe. The popular TH-D7A Kenwood HT, though no longer
manufactured, has integrated APRS messaging with a TNC on board. So,
too, does Yaesu's new VX-8R. And there are mobile 2m radios with
similar capabilities. Moreover, if there were a wide satellite network
of APRS birds, we could hope that even more new HTs would include this
feature, since the cost of implementing a modem is quite low these
days.
Nevertheless, there is a real trade-off here between the power that
digital downlinks provide (and therefore the simplicity of the
receiving system) and the demands that they would make in
accommodating the digital mode of the signals. Another point in their
favour might be that unattended operation is more practical. An APRS
message packet can be set up to be sent every 2 minutes, leaving the
operator free to do other things. Similarly, the radio (or computer)
stores incoming messages.
> Besides the technical difficulty there is also the (human) organising
factor. I heared some ideas about an easy to access?geostationary satellite
with high power downlink. That would be great, but without any
communication?control it would be like the FM LEOs where everyone talks at
the same time and nobody is able to?get there message through.
The same might well be true with a 1200 bps digital voice channel
along the lines of what we've discussed above. But I think the APRS
traffic, consisting in very brief bursts of data, would be easier to
deal with.
> It?might be solved with a central control centre on a safe place (maybe?by
the?Amateur Radio Emergency Service ?) that?has control over the satellite
radio and uses?it as?a remote radio "ear" in space. In this way it is also
possible to use one frequency simplex system.
>
> Just some?ideas,
>
Me too.
73, Bruce
VE9QRP
------------------------------
Message: 4
Date: Mon, 28 Sep 2009 08:27:01 -0400
From: "Frank H. Bauer" <ka3hdo@xxxxxxx.xxx>
Subject: [amsat-bb] Symposium Restaurant Locations
To: <amsat-bb@xxxxx.xxx>
Message-ID: <001201ca4036$ffa8e1b0$fefaa510$@xxx>
Content-Type: text/plain; charset="us-ascii"
All,
I had to go on some unexpected travel out of BWI the past couple of weeks.
So I did some reconnaissance and developed a couple of maps that depict
restaurants near the hotel and airport. You can retrieve these at the AMSAT
Symposium Web Site. Go to the food and drink icon and click on the pdf or
ppt file.
I also included in this package directions to the G&M Restaurant which is
close to the hotel. This restaurant just received the WTOP "Best Crab Cake"
award through a survey from the radio station's Baltimore/Washington
listeners. This restaurant has good food at reasonable prices.
We will be including paper copies of these maps in the symposium
registration packet. But wanted to give you a heads up, so you can plan out
your meals.
And if you haven't registered for the symposium yet, please do so. We are
less than 2 weeks away!!
73, Frank, KA3HDO
------------------------------
Message: 5
Date: Mon, 28 Sep 2009 05:30:21 -0700 (PDT)
From: WILLIAMS MICHAEL <k9qho6762@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: FO-29 Operation
To: amsat-bb@xxxxx.xxx
Message-ID: <825355.10546.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
This is probably the most important email about FO-29. I've high lighted and
underlined the most important parts of the message. I looks like FO-29 will
not be in full operation until the first part of 2010. At this moment it is
only commanded on over Japan as noted in the schedule. ?With the issue of
the batteries, it seems?JAMSAT would consider similiar operations as?it is
now doing?when FO-29 enters?long periods of darkness in the future. This
would possibly allow a? longer life for this great bird.
?
Thanks to JE9PEL for this important infornation.
?
Mike (K9QHO)
AMSAT 33589
?
--- On Wed, 9/9/09, WILLIAMS MICHAEL <k9qho6762@xxxxxxxxx.xxx> wrote:
From: WILLIAMS MICHAEL <k9qho6762@xxxxxxxxx.xxx>
Subject: FO-29
Date: Wednesday, September 9, 2009, 11:06 PM
Start of FO-29 article:-----------------------------------------------------
?
FO-29 status in 2009
FO-29 launched in August 1996 and has been working 14 years.
FO-29 is planning to operate the consecutive use with the analog
transponder until the end of August 2009, but it was confirmed that a
transponder stopped on August 25.
In the later pass, the transponder operation is confirmed when we sent a
command of transponder ON from the control station, but we stopped
transponder temporarily now.
We had the a similar symptom of stopping the transponder in the spring
of 2007 .
FO-29 is in the "high shade rate period" now.
Both of the transponder stop in the spring of 2007 and this time are
thought that by this "high shade rate" and by the rise of the internal
resistance of the deterioration of the battery and by the influence of
the temperature of the battery.
The power control system FO-29 (PCU) watches a terminal voltage of the
battery and turns off the power supply of the transmitter automatically
if it becomes less than the setting voltage. In addition, When FO-29
enters the sunshine area and it recovers to the setting voltage by sun
battery power, it is designed to turn on a transmitter automatically.
However malfunction occurred for this function in 2007.
Because of transmitter was not turned on automatically, We made an
operation schedule plan from the summer of 2007 and managed 1-2 times on
in a day.
This management operation worked well. The electricity income and
expenditure restored or it was cured spontaneously.The transponder has
been worked without control command from control station from summer of
2008.
The power supply circumstances of current FO-29 is almost same situation
as stop period spring of 2007, scheduled operation period, the
consecutively operative period from the summer of 2008 and it is in a
"high shade rate". This transponder off is supposed to be a similar
situation as when transponder stopped in the spring of 2007.
***From this , We decided that we make the operation schedule plan, and
manage the limit of the operative number of times in one day like last
time to keep the electricity income and expenditure untill improve the
"shade rate" which is in January, 2010.
-----------------------------------------------------------------------
Thanks control team
JA1COU Yutaka Murata
Message: 7
Date: Tue, 08 Sep 2009 20:25:03 +0900
From: Mineo Wakita <ei7m-wkt@xxxxxxxxx.xx.xx>
Subject: [amsat-bb] FO-29 schedule Sep. and Oct.
To: amsat-bb@xxxxx.xxx
Message-ID: <10CA3077029EECei7m-wkt@xxxxxxxxx.xx.xx>
Content-Type: text/plain; charset=us-ascii
FO-29 still has some trouble.
Therefore it is examination use for a while only over Japan.
We do not yet understand when it recover.
There are the reception report from South America and Europe.
You may listen to CW with luck over your area.
Control station says that you may be listen in Australia,
South America, North America, and Europe in particular.
Control station says more as follows.
The transmitter becomes OFF by UVC automatically in the eclipse.
The station confirmed the moment when the transmitter became OFF
please inform it of the date and time at the following address.
lab (at) jarl.or.jp
The below * is a predicted pass that command work take time.
And please consent to be a possibility that we cannot turn ON
the transponder by the state of the line.
-----------------
September, UTC
11 21:37
12 12:21*, 22:26
13 11:30
14 22:23
15 None
16 12:15*, 22:20
17 None
18 12:03*, 22:15
19 11:15, 21:20
20 12:05*
21 12:55*, 22:58
22 10:10, 22:10
23 12:50
24 None
25 10:58, 22:50
26 11:50*, 21:55
27 12:36*
28 21:50
29 12:35*, 22:45
30 11:40*, 21:45
October, UTC
1 12:30*, 22:35
2 11:35, 21:45
3 12:25, 22:28
4 11:28
5 22:25
6 13:08, 21:33
7 12:10, 22:23
8 13:05, 21:35
9 None
10 11:12, 23:08
11 12:05*, 22:12
12 11:08
13 None
-----------------
JE9PEL, Mineo Wakita
------------------------------
------------------------------
Message: 6
Date: Mon, 28 Sep 2009 14:46:05 +0200
From: Kai Gunter Brandt <kai.brandt@xxx.xxx.xx>
Subject: [amsat-bb] Re: All Satellites
To: Bruce Robertson <ve9qrp@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx William Leijenaar <pe1rah@xxxxx.xxx>
Message-ID: <4AC0B00D.2000102@xxx.xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Bruce Robertson wrote:
> On Mon, Sep 28, 2009 at 7:04 AM, William Leijenaar <pe1rah@xxxxx.xxx> wrote:
>> Hello AMSATs,
>>
>> I agree that APRS can have a higher power transmittter, because of its
small amount of time to get the data broadcasted. However the workability
with the HT and whipe antenna is only an advantage for the downlink. For the
uplink there will be no advantage.
>
>> Personally I believe that making a satellite easier accessable will also
decrease its functional efficiency. This is especially the case for
satellites with limited user access, like single channel FM satellites. This
also includes APRS. The same issue is valide for a geostationary satellite,
with the addition that a geostationary satellite would be overloaded in
short time by more and more stronger stations as fixed antennas can be used.
Only the uplink power level would be the parameter of "competition".
Resulting in a privat chat satellite for only few (high power) users.
>
>> Satellites for emergency communication sounds very interresting, and
personally I believe it can give a great advantage when doing it well. The
question is only what will work well in an emergency situation. It will
depend on the needs and the availability of equipment in the effected area.
I believe that digital communication will be of limited use as you need also
a computer, modem, keyboard, screen, software etc besides your radio. Only
one thing missing and you will not be "heared". I don't say it is
impossible, but to make the system work the ground stations need to be made
more easier somehow. Maybe HT APRS in combination with voice to text
conversion (and opposite) would be an idea ?
>
> In some cases, the groundstation situation might not be as complicated
> as you describe. The popular TH-D7A Kenwood HT, though no longer
> manufactured, has integrated APRS messaging with a TNC on board. So,
> too, does Yaesu's new VX-8R. And there are mobile 2m radios with
> similar capabilities. Moreover, if there were a wide satellite network
> of APRS birds, we could hope that even more new HTs would include this
> feature, since the cost of implementing a modem is quite low these
> days.
Not to be picky but the VX-8 do not have an inbuilt TNC but it has a
"TNC" doing APRS and could not be used to connect to a computer.
But i think that APRS is a nice function for the sats. It's easy to use
and you can do i.e e-mail too. It's easy to operate and requires very
little hardware to operate.
APRS is a nice mode to allow more people use the same "bandwidth". Doing
the sats portable with voice is not always an easy task if the majority
is using rotators and high power.
I really would like more APRS sats and more "igates" as i'm happy with
messaging capability and positioning.
Most new tracker like TinyTrack etc have message and display capability
so that you don't need a special made APRS radio.
Kai Gunter
LA3QMA
------------------------------
Message: 7
Date: Mon, 28 Sep 2009 08:49:56 -0400
From: Josh Smith <juicewvu@xxxxx.xxx>
Subject: [amsat-bb] Re: Satellite Orbit Prediction in Python
To: k6hx@xxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<d3bf5a870909280549j16129c87pc172097930a83ed@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Mark,
Thanks for the link - I've been considering trying to cobble together
a "web service" that will create an ical or rss feed of upcoming
passes over my QTH. Hopefully this library is the kick in the rear
end I need to get working on this.
Thanks,
Josh Smith
KD8HRX
email/jabber: juicewvu@xxxxx.xxx
phone: 304.237.9369(c)
On Mon, Sep 28, 2009 at 2:06 AM, Mark VandeWettering <kf6kyi@xxxxx.xxx> wrote:
> I just thought I'd drop a quick note here about some fun I've been
> having today with satellite orbit prediction in Python. ? When I
> started mucking around with satellites, I used "predict", which was
> pretty good, but at some point I wanted to answer some questions which
> weren't easy to answer using predict. ? Questions like "when will
> AO-51 be visible from both my home in CM87 and locations in Hawaii",
> or "what was the radius of the circle of visibility for AO-7 compared
> to ISS"?
>
> Luckily, I'm a programmer. ? In fact, I'm a programmer who programs
> for fun. ? So, I did a bit of research, and then coded up a version of
> G3RUH's "Plan 13" algorithm in Python, and then wrote some scripts to
> download elements from celestrak, and then a simple one to print data
> on the next pass of any named satellite. ? ? And, they worked pretty
> good. ?I've used them for the last year or so to do all my pass
> predictions. ? But there are still a couple of minor issues with the
> library. ?It didn't handle geosynchronous satellites very well. ? It
> implemented only the most basic of orbital models. ? I was never
> confident that the "is this satellite in eclipse" stuff working
> exactly right.
>
> Luckily though, it turns out that someone else has been busy writing a
> more complete library: PyEphem http://rhodesmill.org/pyephem/
>
> It's a library whose primary purpose is to calculate the positions of
> astronomical objects. ? ?I've used it a couple of times to (for
> instance) figure out the size of Mars compared to Jupiter, and found
> it very easy to use. ? But today, I realized that it had a full
> implementation of the SGP4 and SDP4 orbital models built in, and could
> be used to predict satellite passes. ? ?As a proof of concept, I
> hacked together a 23 line script that could print the details of
> upcoming ISS passes. ? It seems to work great, and is really quite
> easy to use.
>
> You can find some of the simple example code at my blog:
>
>
http://brainwagon.org/2009/09/27/how-to-use-python-to-predict-satellite-locati
ons/
>
> I'll probably be porting all of my existing scripts to use this soon.
> ?In the mean time, if you have a similar task, you might look to it to
> solve your custom satellite prediction problems.
>
> 73 Mark K6HX
> _______________________________________________
> 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: Mon, 28 Sep 2009 08:53:15 -0400
From: Joseph Armbruster <josepharmbruster@xxxxx.xxx>
Subject: [amsat-bb] Re: Satellite Orbit Prediction in Python
To: "Rich Dailey (Gmail)" <redailey1@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx k6hx@xxxx.xxx
Message-ID:
<938f42d70909280553r275c1919q13467dbce06fbe5a@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Awesome stuff!! I'll have to check out this library tonight. I started
hacking at something similar but started digging into the internals of
SGP4/SDP4, then got distracted and never finished. If you have a rotator,
it'd be a cool quick project to slap pyserial on there and control your
rotator. It'd be pretty awesome to have a Kep to Rotator Control in about
10 lines of code :-)
Joe
On Mon, Sep 28, 2009 at 4:12 AM, Rich Dailey (Gmail)
<redailey1@xxxxx.xxx>wrote:
> Great stuff, Mark. I'm an old, dusty assembler, and later a C programmer.
> Used to program for fun,
> then for profit, then after a few years of life I looked around and the art
> had snuck ahead of me.
>
> I used to hack up the PREDICT code for my own devious purposes, and just to
> have fun
> with the source.
>
> Your blog post reminded me of how fun it is to cobble together one's own
> code to
> solve a particular problem. Keep it up!
>
> Rich, N8UX
>
>
> Mark wrote:
> >You can find some of the simple example code at my blog:
> >
> >
>
http://brainwagon.org/2009/09/27/how-to-use-python-to-predict-satellite-locati
ons/
> >
> >I'll probably be porting all of my existing scripts to use this soon.
> > In the mean time, if you have a similar task, you might look to it to
> >solve your custom satellite prediction problems.
> >
> >73 Mark K6HX
> >_______________________________________________
>
> _______________________________________________
> 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: 9
Date: Mon, 28 Sep 2009 12:53:54 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: FO-29 Operation
To: WILLIAMS MICHAEL <k9qho6762@xxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4AC0B1E2.1060901@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
I don't see anything highlighted or underlined!
WILLIAMS MICHAEL wrote:
> This is probably the most important email about FO-29. I've high lighted
and underlined the most important parts of the message. I looks like FO-29
will not be in full operation until the first part of 2010. At this moment
it is only commanded on over Japan as noted in the schedule. With the issue
of the batteries, it seems JAMSAT would consider similiar operations as it
is now doing when FO-29 enters long periods of darkness in the future. This
would possibly allow a longer life for this great bird.
>
> Thanks to JE9PEL for this important infornation.
>
> Mike (K9QHO)
> AMSAT 33589
>
> --- On Wed, 9/9/09, WILLIAMS MICHAEL <k9qho6762@xxxxxxxxx.xxx> wrote:
>
>
> From: WILLIAMS MICHAEL <k9qho6762@xxxxxxxxx.xxx>
> Subject: FO-29
> Date: Wednesday, September 9, 2009, 11:06 PM
>
>
>
>
>
>
>
> Start of FO-29 article:-----------------------------------------------------
>
> FO-29 status in 2009
>
> FO-29 launched in August 1996 and has been working 14 years.
>
> FO-29 is planning to operate the consecutive use with the analog
> transponder until the end of August 2009, but it was confirmed that a
> transponder stopped on August 25.
>
> In the later pass, the transponder operation is confirmed when we sent a
> command of transponder ON from the control station, but we stopped
> transponder temporarily now.
>
> We had the a similar symptom of stopping the transponder in the spring
> of 2007 .
>
> FO-29 is in the "high shade rate period" now.
> Both of the transponder stop in the spring of 2007 and this time are
> thought that by this "high shade rate" and by the rise of the internal
> resistance of the deterioration of the battery and by the influence of
> the temperature of the battery.
>
> The power control system FO-29 (PCU) watches a terminal voltage of the
> battery and turns off the power supply of the transmitter automatically
> if it becomes less than the setting voltage. In addition, When FO-29
> enters the sunshine area and it recovers to the setting voltage by sun
> battery power, it is designed to turn on a transmitter automatically.
> However malfunction occurred for this function in 2007.
>
> Because of transmitter was not turned on automatically, We made an
> operation schedule plan from the summer of 2007 and managed 1-2 times on
> in a day.
> This management operation worked well. The electricity income and
> expenditure restored or it was cured spontaneously.The transponder has
> been worked without control command from control station from summer of
> 2008.
>
> The power supply circumstances of current FO-29 is almost same situation
> as stop period spring of 2007, scheduled operation period, the
> consecutively operative period from the summer of 2008 and it is in a
> "high shade rate". This transponder off is supposed to be a similar
> situation as when transponder stopped in the spring of 2007.
>
> ***From this , We decided that we make the operation schedule plan, and
> manage the limit of the operative number of times in one day like last
> time to keep the electricity income and expenditure untill improve the
> "shade rate" which is in January, 2010.
>
> -----------------------------------------------------------------------
> Thanks control team
>
> JA1COU Yutaka Murata
>
>
> Message: 7
> Date: Tue, 08 Sep 2009 20:25:03 +0900
> From: Mineo Wakita <ei7m-wkt@xxxxxxxxx.xx.xx>
> Subject: [amsat-bb] FO-29 schedule Sep. and Oct.
> To: amsat-bb@xxxxx.xxx
> Message-ID: <10CA3077029EECei7m-wkt@xxxxxxxxx.xx.xx>
> Content-Type: text/plain; charset=us-ascii
>
> FO-29 still has some trouble.
> Therefore it is examination use for a while only over Japan.
> We do not yet understand when it recover.
> There are the reception report from South America and Europe.
> You may listen to CW with luck over your area.
>
> Control station says that you may be listen in Australia,
> South America, North America, and Europe in particular.
>
> Control station says more as follows.
> The transmitter becomes OFF by UVC automatically in the eclipse.
> The station confirmed the moment when the transmitter became OFF
> please inform it of the date and time at the following address.
>
> lab (at) jarl.or.jp
>
> The below * is a predicted pass that command work take time.
> And please consent to be a possibility that we cannot turn ON
> the transponder by the state of the line.
>
> -----------------
> September, UTC
> 11 21:37
> 12 12:21*, 22:26
> 13 11:30
> 14 22:23
> 15 None
> 16 12:15*, 22:20
> 17 None
> 18 12:03*, 22:15
> 19 11:15, 21:20
> 20 12:05*
> 21 12:55*, 22:58
> 22 10:10, 22:10
> 23 12:50
> 24 None
> 25 10:58, 22:50
> 26 11:50*, 21:55
> 27 12:36*
> 28 21:50
> 29 12:35*, 22:45
> 30 11:40*, 21:45
>
> October, UTC
> 1 12:30*, 22:35
> 2 11:35, 21:45
> 3 12:25, 22:28
> 4 11:28
> 5 22:25
> 6 13:08, 21:33
> 7 12:10, 22:23
> 8 13:05, 21:35
> 9 None
> 10 11:12, 23:08
> 11 12:05*, 22:12
> 12 11:08
> 13 None
> -----------------
>
> JE9PEL, Mineo Wakita
>
>
>
> ------------------------------
>
> _______________________________________________
> 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: 8.5.409 / Virus Database: 270.13.113/2400 - Release Date:
09/28/09 05:51:00
>
--
Nigel A. Gunn, 1865 El Camino Drive, Xenia, OH 45385-1115, USA. tel +1 937
825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF), e-mail nigel@xxxxx.xxx www
http://www.ngunn.net
Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pigs QRP
Club International #385,
Dayton ARA #2128, AMSAT-NA LM-1691, AMSAT-UK 0182, MKARS, ALC,
GCARES, XWARN.
------------------------------
Message: 10
Date: Mon, 28 Sep 2009 13:08:12 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: keps
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <4AC0B53C.80305@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
ANDE POLLUX SPHERE
1 35693U 09038E 09270.75161923 .00024150 00000-0 11738-3 0 589
2 35693 051.6396 136.9854 0002884 219.5067 140.5754 15.82296457 9347
ANDE CASTOR SPHERE
1 35694U 09038F 09271.09002049 .00012500 00000-0 65843-4 0 562
2 35694 051.6405 135.5071 0003090 230.6994 129.3762 15.81148215 9394
TATIANA-2 (RS-28)
1 35868U 09049D 09269.80165911 +.00000177 +00000-0 +10000-3 0 00113
2 35868 098.7998 319.9570 0005066 042.4864 317.6631 14.22084863001298
SUMBANDILA
1 35870U 09049F 09271.12594053 .00002270 00000-0 10000-3 0 236
2 35870 097.3722 320.9996 0010180 259.0098 185.4894 15.22803326 1581
SWISSCUBE
1 35932U 09051B 09269.75151502 +.00005219 +00000-0 +12986-2 0 00074
2 35932 098.3367 004.4323 0007042 275.0402 084.9893 14.52119461000510
UWE-2
1 35933U 09051C 09269.75016994 +.00007797 +00000-0 +19109-2 0 00088
2 35933 098.3342 004.4307 0004574 288.0186 072.0499 14.52693268000518
BEESAT
1 35934U 09051D 09270.71435912 .00003303 00000-0 81574-3 0 76
2 35934 098.3277 005.3821 0005951 295.3450 064.7052 14.52721073 656
ITUpSAT1
1 35935U 09051E 09271.19850776 .00001930 00000-0 48744-3 0 75
2 35935 098.3396 005.8711 0007236 274.7355 085.3039 14.52122969 715
------------------------------
Message: 11
Date: Mon, 28 Sep 2009 06:18:52 -0700 (PDT)
From: Bob Cutter <ki0g@xxxxx.xxx>
Subject: [amsat-bb] HamSat iPhone App
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <595743.1085.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
An update has just been released and it is very good. The improvements are
extensive and useful.
73, Bob KI?G
------------------------------
Message: 12
Date: Mon, 28 Sep 2009 10:17:48 -0400
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] Re: Sumbandila blog
To: amsat-bb@xxxxx.xxx
Cc: eu-amsat@xxxxxxxxxxx.xxx
Message-ID: <4AC08D4C.3624.1179B1@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=US-ASCII
On 28 Sep 2009 at 9:52, Pieter Kotze wrote:
Date sent: Mon, 28 Sep 2009 09:52:52 +0200
From: Pieter Kotze <pkotze@xxxx.xx.xx>
Subject: [amsat-bb] Sumbandila blog
To: amsat-bb@xxxxx.xxx
> For those who would like to keep up with what is happening see the
following:
>
> http://sumbandilamission.blogspot.com/
>
> Regards
> ZS1PK/M0PAK
>
>
>From this site what we can read does not seems to be very positive for a
long trouble free operation? Could be some hardware are not
radiation resistant or enough to sustain long nominal operation.
One factor will remain radiation will not vanished and the effect on
material will only added up.
"There seems to be a high incidence of Single Event Effects (SEE) due to
radiation, especially on the On-Board Computer (OBC). We have
however designed all the electronics with latch-up protection, so none of
the SEE occurrences to date have caused any permanent damage.
Sometimes an SEE causes the OBC to reset and we have recently noticed that
an auto restart of the processor then does not fully complete.
With the WOD now available to us it seems that the lengthening of a timing
constraint in software will be able to alleviate this problem.
Note that we could not test for SEE on the ground so were not able to
observe this timing effect prior to launch."
I just hope they will be able to go around theses issues
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 13
Date: Mon, 28 Sep 2009 11:01:43 EDT
From: Pughkeithd@xx.xxx
Subject: [amsat-bb] Re: Symposium Restaurant Locations
To: ka3hdo@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
Cc: w5iu@xxxxxx.xxx
Message-ID: <cee.64b6beeb.37f229d7@xx.xxx>
Content-Type: text/plain; charset="US-ASCII"
In a message dated 9/28/2009 7:47:44 AM Central Daylight Time,
ka3hdo@xxxxxxx.xxx writes:
> Subj: [amsat-bb] Symposium Restaurant Locations
> Date:9/28/2009 7:47:44 AM Central Daylight Time
> From:ka3hdo@xxxxxxx.xxx
> To:amsat-bb@xxxxx.xxx
> Received from Internet:
>
>
>
> All,
>
> I had to go on some unexpected travel out of BWI the past couple of weeks.
> So I did some reconnaissance and developed a couple of maps that depict
> restaurants near the hotel and airport. You can retrieve these at the
> AMSAT
> Symposium Web Site. Go to the food and drink icon and click on the pdf or
> ppt file.
>
> I also included in this package directions to the G&M Restaurant which is
> close to the hotel. This restaurant just received the WTOP "Best Crab
> Cake"
> award through a survey from the radio station's Baltimore/Washington
> listeners. This restaurant has good food at reasonable prices.
>
> We will be including paper copies of these maps in the symposium
> registration packet. But wanted to give you a heads up, so you can plan
> out
> your meals.
>
> And if you haven't registered for the symposium yet, please do so. We are
> less than 2 weeks away!!
>
> 73, Frank, KA3HDO
> _______________________________________________
> 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
>
Thank's for reminding me about G&M's. This is the place that we frequently
sent out to for Subs at all hours when working late at Westinghouse - BWI
in the 70s and 80s. We nicknamed it "Grease and Mayonaise" but it was
excellent. The last time I ate there it had expanded into a very good full
service restaurant, but still retined the Sub Shop as well. I hope the Sunset
Restaurant in Glen Burnie made the list.
http://www.sunsetrestaurant.com/
73 - Keith, W5IU
------------------------------
_______________________________________________
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 504
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