| |
CX2SA > SATDIG 07.10.09 06:03l 898 Lines 28193 Bytes #999 (0) @ WW
BID : AMSATBB4521
Read: GUEST
Subj: AMSAT-BB-digest V4 521
Path: IZ3LSV<IK2XDE<DB0RES<DK0WUE<7M3TJZ<XE1FH<CX4AE<CX2SA
Sent: 091007/0344Z @:CX2SA.LAV.URY.SA #:7696 [Minas] FBB7.00e $:AMSATBB4521
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. GJTRACKER Version 2.0.4 (Lance Collister)
2. RG316/U (Amateur Radio Station W4MPS)
3. A0-27 Website (Rick - WA4NVM)
4. Re: RG316/U (Albert Jagnow)
5. SatStatus (Andrew Rich)
6. Re: RG316/U (Alan VE4YZ)
7. Radio Amateurs supporting a mission in space (video)
(Henk, PA3GUO)
8. Re: A0-27 Website (David Wing)
9. Re: A0-27 Website (Rick - WA4NVM)
10. Re: Radio Amateurs supporting a mission in space (video)
(Alan VE4YZ)
11. Re: Radio Amateurs supporting a mission in space (video)
(Graham Shirville)
12. Road Trip to DM90 C.I.P. (w6zkh@xxxxxxx.xxxx
13. Portable ARISS groundstation ON7RT (Trevor .)
14. Re: Radio Amateurs supporting a mission in space (video)
(Joseph Armbruster)
15. Re: Radio Amateurs supporting a mission in space (video)
(Dale Hershberger)
16. Re: Satellite Orbit Prediction in Python (Joseph Armbruster)
17. Re: [Hearsat] Opinions on receivers (Steve Meuse)
18. Re: [Hearsat] Opinions on receivers (Greg D.)
----------------------------------------------------------------------
Message: 1
Date: Tue, 06 Oct 2009 20:21:14 +0000
From: Lance Collister <w7gj@x.xxx>
Subject: [amsat-bb] GJTRACKER Version 2.0.4
To: Magic Band EME <magic@xxxxx.xxx>, AMSAT <amsat-bb@xxxxx.xxx>,
"'moon-net'" <moon-net@xxxxxxxxx.xxxxxx.xxx>, 50 MHZ Mailing List
<50mhz@xxxxxxx.xxx.xxx>
Message-ID: <BLU0-SMTP448B873DEFBD29540DB5AE89CE0@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Howdy!
I am grateful for such prompt feedback on Version 2.0.3! It seems everyone
uses
the program a little differently ;-) There were some errors in how the
program
handled real time mode calculations when a user's computer clock was not set
to
UTC. The program now works correctly with any local time offset from UTC
(including fractional hours, where applicable).
As always, the correct current version is available in the complete
distribution
package with associated files at http://bigskyspaces.com/w7gj/GJTRACKER.zip
If you are already a user of GJTRACKER and only need the updated application
file,
it also is available at http://www.bigskyspaces.com/w7gj/GJTRACKER.exe
Good luck and DX to all! See you off the moon! VY 73, Lance
--
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8,
E51SIX)
P.O. Box 73
Frenchtown, MT 59834 USA
QTH: DN27UB
TEL: (406) 626-5728 URL: http://www.bigskyspaces.com/w7gj
2m DXCC #11, 6m DXCC #815
------------------------------
Message: 2
Date: Tue, 6 Oct 2009 15:16:22 -0400
From: "Amateur Radio Station W4MPS" <W4MPS@xx.xx.xxx>
Subject: [amsat-bb] RG316/U
To: <amsat-bb@xxxxx.xxx>
Message-ID: <C296804EEC2F4A8D8DE168FCF9CDACCF@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
I will be traveling to Ireland next week and will be taking my FT60R
handheld
and an Elk antenna. I purchased a short length of RG316 with appropriate
connectors installed to avoid the need for several adapters and bulkier
RG58. I
was shocked at how small the diameter is for the 316. Manufacturer assures
me
it will work quite well at 145/435 for the use intended. Has anyone had
experience with this cable? Tnx
73
Marc, W4MPS
W4MPS@xx.xx.xxx
------------------------------
Message: 3
Date: Tue, 6 Oct 2009 16:01:32 -0500
From: "Rick - WA4NVM" <wa4nvm@xxxxxxx.xxx>
Subject: [amsat-bb] A0-27 Website
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Message-ID: <EBAF02ACD0B241D5895123A107C849F7@xxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi All,
Does anyone know what has happened to the A0-27 website? It hasn't worked for
over three days. So far, I just have to track and listen for the bird to
turn on.
Thanks for any information,
Rick - WA4NVM
------------------------------
Message: 4
Date: Tue, 6 Oct 2009 16:03:06 -0500
From: "Albert Jagnow" <albert-jagnow@xxxxx.xxx>
Subject: [amsat-bb] Re: RG316/U
To: "Amateur Radio Station W4MPS" <W4MPS@xx.xx.xxx>,
<amsat-bb@xxxxx.xxx>
Message-ID:
<A7891B10A93B2142A7D5F830FBAF5A9B02727AE7@xxxxxx.xxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I have not used that cable, but my coax calculator says at 435Mhz it has
a 16.936db loss per 100 feet, or 9.65db loss per 100 feet at 145Mhz. A
3 foot section of cable would have a loss of .5db or 89% efficient at
435 and .3db loss or 94% efficient at 145Mhz. Probably work OK as long
as it is a really short length of cable.
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Amateur Radio Station W4MPS
Sent: Tuesday, October 06, 2009 2:16 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] RG316/U
I will be traveling to Ireland next week and will be taking my FT60R
handheld
and an Elk antenna. I purchased a short length of RG316 with appropriate
connectors installed to avoid the need for several adapters and bulkier
RG58. I
was shocked at how small the diameter is for the 316. Manufacturer
assures
me
it will work quite well at 145/435 for the use intended. Has anyone had
experience with this cable? Tnx
73
Marc, W4MPS
W4MPS@xx.xx.xxx
_______________________________________________
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 Oct 2009 07:06:39 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] SatStatus
To: <amsat-bb@xxxxx.xxx>
Message-ID: <987E1D90107E435DBB3C7F21D2531CE5@xxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Well sat_status has been migrated from a tiny ASUS 1008HA to my LINUX server.
Seems to be quite usuable and seems to stay up ok
http://vk4tec.no-ip.org/sat_status/
Are there any other projects people have ?
I would like to tackle
+ Web driven rotator control
+ Predict driven rotator controller
+ Some more satellite web tracking solutions
Andrew
------------------------------
Message: 6
Date: Tue, 6 Oct 2009 16:12:39 -0500
From: "Alan VE4YZ" <ve4yz@xxx.xxx>
Subject: [amsat-bb] Re: RG316/U
To: "'Amateur Radio Station W4MPS'" <W4MPS@xx.xx.xxx>,
<amsat-bb@xxxxx.xxx>
Message-ID: <31354B18192B4DBC8E2D872BF8072A4A@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
The loss compared to RG58 is about 2 times greater. But if you are
typically runs about 5' or 6' lengths, then the loss is 2 X (next to
nothing).
Expensive when you have connectors mounted for you. I've only used 174
which is almost the same with DIY SMA connectors to make much shorter WiFi
cables. Now you have me thinking more about this. The HT already has SMA
and SMA/BNC adapters are readily available to connect to my Arrow... hmmmm
http://www.on4sh.be/ham/coax/
Or
http://www.hamuniverse.com/coaxdata.html
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Amateur Radio Station W4MPS
Sent: October 6, 2009 2:16 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] RG316/U
I will be traveling to Ireland next week and will be taking my FT60R
handheld and an Elk antenna. I purchased a short length of RG316 with
appropriate connectors installed to avoid the need for several adapters and
bulkier RG58. I was shocked at how small the diameter is for the 316.
Manufacturer assures me it will work quite well at 145/435 for the use
intended. Has anyone had experience with this cable? Tnx
73
Marc, W4MPS
W4MPS@xx.xx.xxx
_______________________________________________
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: Tue, 6 Oct 2009 23:18:36 +0200 (CEST)
From: "Henk, PA3GUO" <hamoen@xxx.xx>
Subject: [amsat-bb] Radio Amateurs supporting a mission in space
(video)
To: <amsat-bb@xxxxx.xxx>
Message-ID: <51122.212.61.85.231.1254863916.squirrel@xxxxxxx.xxx.xx>
Content-Type: text/plain; charset=iso-8859-1
Dear all,
Very often I find it difficult to explain to 'outsiders' what HAM radio is
all about.
Therefore I have released a short video on YouTube about the recent ANDE-2
experiments and how radio amateurs world-wide contributed to this mission.
When I was young I watched the first Space Shuttle flight on TV. A far away,
fantastic scientific event. Many years later we as radio amateurs are given
opportunities to engage directly in space-experiments. It's a thrill !
Featured in the video are the launch and deploy from STS-127, as well as
reception and decoding of the satellite's radio signals received from space.
http://www.youtube.com/watch?v=WGvRnqII0j8
For highest quality ensure you enable HD (it does slow-down the download a
bit though)
Best regards,
Henk, PA3GUO
------------------------------
Message: 8
Date: Tue, 6 Oct 2009 14:40:56 -0700
From: "David Wing" <david@xxxxxx.xxx>
Subject: [amsat-bb] Re: A0-27 Website
To: "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Message-ID: <1A7B38E53810440B9B4AADF483E0C69A@xxxxx>
Content-Type: text/plain; charset="us-ascii"
Rick,
Not sure about the AO-27 website but for tracking the TOPR, I use a little
utility called "AO-27 Satellite Schedule"
You can download this at:
http://www.cs.rit.edu/~cjh9783/programs/satsched.php
Good contact this afternoon on AO-27...the QRN cleared just long enough to
hear you call me after I told K8YSE there was too much noise to understand
him.
73
David
K6CDW
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Rick - WA4NVM
Sent: Tuesday, October 06, 2009 2:02 PM
To: AMSAT BB
Subject: [amsat-bb] A0-27 Website
Hi All,
Does anyone know what has happened to the A0-27 website? It hasn't worked
for
over three days. So far, I just have to track and listen for the bird to
turn on.
Thanks for any information,
Rick - WA4NVM
_______________________________________________
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: Tue, 6 Oct 2009 16:52:29 -0500
From: "Rick - WA4NVM" <wa4nvm@xxxxxxx.xxx>
Subject: [amsat-bb] Re: A0-27 Website
To: "David Wing" <david@xxxxxx.xxx>, "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Message-ID: <479051151A1547D5BF75A336F9C11362@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
David,
Thanks for the url for the utility. And Congrats working John, W6ZKH the
other day to get AL in your log.
CU on the birds,
Rick
> Rick,
>
> Not sure about the AO-27 website but for tracking the TOPR, I use a little
> utility called "AO-27 Satellite Schedule"
>
> You can download this at:
>
> http://www.cs.rit.edu/~cjh9783/programs/satsched.php
>
>
> Good contact this afternoon on AO-27...the QRN cleared just long enough to
> hear you call me after I told K8YSE there was too much noise to understand
> him.
>
> 73
> David
> K6CDW
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Rick - WA4NVM
> Sent: Tuesday, October 06, 2009 2:02 PM
> To: AMSAT BB
> Subject: [amsat-bb] A0-27 Website
>
> Hi All,
>
> Does anyone know what has happened to the A0-27 website? It hasn't worked
> for
> over three days. So far, I just have to track and listen for the bird to
> turn on.
>
> Thanks for any information,
> Rick - WA4NVM
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 10
Date: Tue, 6 Oct 2009 17:01:03 -0500
From: "Alan VE4YZ" <ve4yz@xxx.xxx>
Subject: [amsat-bb] Re: Radio Amateurs supporting a mission in space
(video)
To: "'Henk, PA3GUO'" <hamoen@xxx.xx>, <amsat-bb@xxxxx.xxx>
Message-ID: <C9BE24E53EFE452194B5E2F23B622C62@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Magnificent work Henk... I will be add a link to your video today for our
Space Camp and CubeSat students.
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Henk, PA3GUO
Sent: October 6, 2009 4:19 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Radio Amateurs supporting a mission in space (video)
Dear all,
Very often I find it difficult to explain to 'outsiders' what HAM radio is
all about.
Therefore I have released a short video on YouTube about the recent ANDE-2
experiments and how radio amateurs world-wide contributed to this mission.
When I was young I watched the first Space Shuttle flight on TV. A far away,
fantastic scientific event. Many years later we as radio amateurs are given
opportunities to engage directly in space-experiments. It's a thrill !
Featured in the video are the launch and deploy from STS-127, as well as
reception and decoding of the satellite's radio signals received from space.
http://www.youtube.com/watch?v=WGvRnqII0j8
For highest quality ensure you enable HD (it does slow-down the download a
bit though)
Best regards,
Henk, PA3GUO
_______________________________________________
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: 11
Date: Tue, 6 Oct 2009 23:30:12 +0100
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Radio Amateurs supporting a mission in space
(video)
To: "Henk, PA3GUO" <hamoen@xxx.xx>, <amsat-bb@xxxxx.xxx>
Message-ID: <2CB848C7FDBB4F4DB94A578B4C2D8930@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Henk,
Great video - very well presented and a valuable tool for us to use when
promoting the radio amateur fraternity to other space addicts!
Thank you
73
Graham
G3VZV
----- Original Message -----
From: "Henk, PA3GUO" <hamoen@xxx.xx>
To: <amsat-bb@xxxxx.xxx>
Sent: Tuesday, October 06, 2009 10:18 PM
Subject: [amsat-bb] Radio Amateurs supporting a mission in space (video)
> Dear all,
>
> Very often I find it difficult to explain to 'outsiders' what HAM radio is
> all about.
>
> Therefore I have released a short video on YouTube about the recent ANDE-2
> experiments and how radio amateurs world-wide contributed to this mission.
>
> When I was young I watched the first Space Shuttle flight on TV. A far
> away,
> fantastic scientific event. Many years later we as radio amateurs are
> given
> opportunities to engage directly in space-experiments. It's a thrill !
>
> Featured in the video are the launch and deploy from STS-127, as well as
> reception and decoding of the satellite's radio signals received from
> space.
>
> http://www.youtube.com/watch?v=WGvRnqII0j8
> For highest quality ensure you enable HD (it does slow-down the download a
> bit though)
>
> Best regards,
> Henk, PA3GUO
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 12
Date: Tue, 6 Oct 2009 22:36:56 +0000 (UTC)
From: w6zkh@xxxxxxx.xxx
Subject: [amsat-bb] Road Trip to DM90 C.I.P.
To: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID:
<1051920482.5942841254868616147.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
The planned trip to Grid DM90 is off for the time being. Got to
investigating the map, and it will be a +100 mile one-way trip, which is
abit out of the way at the moment. Depending on how we go home West from
DM91, will depend if I hit it. Sorry for getting hopes up. Will be on EM00
at the 2351 utc pass.
John W6ZKH
------------------------------
Message: 13
Date: Tue, 6 Oct 2009 22:51:24 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Portable ARISS groundstation ON7RT
To: amsat-bb@xxxxx.xxx
Message-ID: <66992.17822.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
I liked this YouTube video regarding Wednesdays (Oct 7) ARISS contact with
Sint-Michielscollege Brasschaat, Belgium, see
http://www.southgatearc..org/news/october2009/portable_ariss_groundstation_on7
rt.htm
73 Trevor M5AKA
------------------------------
Message: 14
Date: Tue, 6 Oct 2009 19:01:17 -0400
From: Joseph Armbruster <josepharmbruster@xxxxx.xxx>
Subject: [amsat-bb] Re: Radio Amateurs supporting a mission in space
(video)
To: "Henk, PA3GUO" <hamoen@xxx.xx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <A375EDC9-ED9D-4F5F-8034-D6A831AFEF85@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes
Thanks for sharing, Awesome video !
Joe
On Oct 6, 2009, at 5:18 PM, Henk, PA3GUO wrote:
> Dear all,
>
> Very often I find it difficult to explain to 'outsiders' what HAM
> radio is all about.
>
> Therefore I have released a short video on YouTube about the recent
> ANDE-2
> experiments and how radio amateurs world-wide contributed to this
> mission.
>
> When I was young I watched the first Space Shuttle flight on TV. A
> far away,
> fantastic scientific event. Many years later we as radio amateurs
> are given
> opportunities to engage directly in space-experiments. It's a thrill !
>
> Featured in the video are the launch and deploy from STS-127, as
> well as
> reception and decoding of the satellite's radio signals received
> from space.
>
> http://www.youtube.com/watch?v=WGvRnqII0j8
> For highest quality ensure you enable HD (it does slow-down the
> download a bit though)
>
> Best regards,
> Henk, PA3GUO
>
>
>
> _______________________________________________
> 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: 15
Date: Tue, 06 Oct 2009 16:43:46 -0800
From: Dale Hershberger <daleh@xxxxxx.xxx>
Subject: [amsat-bb] Re: Radio Amateurs supporting a mission in space
(video)
To: "Henk, PA3GUO" <hamoen@xxx.xx>
Cc: amsat bbs <amsat-bb@xxxxx.xxx>
Message-ID: <4ACBE442.1030407@xxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Henk, PA3GUO wrote:
> Dear all,
>
> Very often I find it difficult to explain to 'outsiders' what HAM radio is
all about.
>
> Therefore I have released a short video on YouTube about the recent ANDE-2
> experiments and how radio amateurs world-wide contributed to this mission.
>
> When I was young I watched the first Space Shuttle flight on TV. A far away,
> fantastic scientific event. Many years later we as radio amateurs are given
> opportunities to engage directly in space-experiments. It's a thrill !
>
> Featured in the video are the launch and deploy from STS-127, as well as
> reception and decoding of the satellite's radio signals received from space.
>
> http://www.youtube.com/watch?v=WGvRnqII0j8
> For highest quality ensure you enable HD (it does slow-down the download a
bit though)
>
> Best regards,
> Henk, PA3GUO
>
>
>
> _______________________________________________
> 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
>
>
Henk,
This is excellent. This is something I could use to show folks how we
as Amateur Radio Ops are able to help the space program.
Thanks.
Dale / KL7XJ
------------------------------
Message: 16
Date: Tue, 6 Oct 2009 23:13:56 -0400
From: Joseph Armbruster <josepharmbruster@xxxxx.xxx>
Subject: [amsat-bb] Re: Satellite Orbit Prediction in Python
To: k6hx@xxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <8DBCD21C-DA9F-4971-8BED-FB2A6BCF1A26@xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252; format=flowed;
delsp=yes
Mark,
I dug into the PyEphem code a bit and slapped together my own script
that will:
- snatch the latest keps from amsat.org
- find all passes taking place within the next N minutes ( this is
configurable)
- provide the user with text / verbal status updates on whatever
interval desired.
Feel free to take a look here:
http://libjoe.blogspot.com/2009/10/where-is-my-satellite-in-python.html
For the record, DO NOT SET LAT OR LONG TO A DOUBLE VALUE. Sorry for
screaming but... sometimes... you just have to :-) I had a bit of
test code that I wrote and took forever trying to figure out why my
local pass times were not coming out correctly. It turned out that
the UTC times were off as well... I traced this back to initializing
my lat/long observer values using a doubleobject as opposed to a
stringobject. You have been warned. I sure hope I didn't miss this
in the documentation somewhere... All I could find on these in the
documentation (without any digging into any of the code) was:
These are the attributes you can set:
date ? Date and time
epoch ? Epoch for astrometric RA/dec
lat ? Latitude
long ? Longitude
elevation ? Elevation (m)
temp ? Temperature (?C)
pressure ? Atmospheric pressure (mBar)
Joe
On Sep 28, 2009, at 2:06 AM, Mark VandeWettering 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: 17
Date: Tue, 6 Oct 2009 23:24:49 -0400
From: Steve Meuse <smeuse@xxxx.xxx>
Subject: [amsat-bb] Re: [Hearsat] Opinions on receivers
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx lmoline@xxxxxxx.xxx
Message-ID: <20091007032449.GA26452@xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Greg D. expunged (ko6th_greg@xxxxxxx.xxxxx
>
> But, as a general coverage receiver or scanner, it's 20-year age clearly
shows. First of all, it's a bit deaf by modern standards. The local NWS
weather channel is an S6 or S7, being fed by a very large TV antenna, with
Preamp, in the attic. It's full scale on my HT with its rubber duck antenna
in the shack. My S-band equipment (Drake 2880, and all that) barely gets
above S1 or S2. You get the idea.
Keep in mind that the lack of receive sensitivity in the R7000 most likely
is due to old leaking electrolytic caps. Specifically, there is a DC-DC
converter board on the underside of the receiver that ends up generating
broadband noise as the caps fail over time. I recently rebuilt this board
and have regained nearly all of the sensitivity that I've lost. I suspect
that if I replaced more electrolytics I could have it back to factory specs.
-Steve
N1JFU - http://n1jfu.blogspot.com - smeuse@xxxxxxx
------------------------------
Message: 18
Date: Tue, 6 Oct 2009 20:41:20 -0700
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: [Hearsat] Opinions on receivers
To: <smeuse@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx lmoline@xxxxxxx.xxx
Message-ID: <BLU133-W102DA4B6132CE6CBD642B7A9CD0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
REALLY? Great tip! It's never been a great receiver, but anything will help.
I'll do some Googling around, but would you happen to have a pointer to more
detailed information on the repair?
Thanks,
Greg.
> Date: Tue, 6 Oct 2009 23:24:49 -0400
> From: smeuse@xxxx.xxx
> To: ko6th_greg@xxxxxxx.xxx
> CC: amsat-bb@xxxxx.xxxx lmoline@xxxxxxx.xxx
> Subject: Re: [amsat-bb] Re: [Hearsat] Opinions on receivers
>
> Greg D. expunged (ko6th_greg@xxxxxxx.xxxxx
>
> >
> > But, as a general coverage receiver or scanner, it's 20-year age clearly
shows. First of all, it's a bit deaf by modern standards. The local NWS
weather channel is an S6 or S7, being fed by a very large TV antenna, with
Preamp, in the attic. It's full scale on my HT with its rubber duck antenna
in the shack. My S-band equipment (Drake 2880, and all that) barely gets
above S1 or S2. You get the idea.
>
> Keep in mind that the lack of receive sensitivity in the R7000 most likely
is due to old leaking electrolytic caps. Specifically, there is a DC-DC
converter board on the underside of the receiver that ends up generating
broadband noise as the caps fail over time. I recently rebuilt this board
and have regained nearly all of the sensitivity that I've lost. I suspect
that if I replaced more electrolytics I could have it back to factory specs.
>
>
> -Steve
>
> N1JFU - http://n1jfu.blogspot.com - smeuse@xxxxxxx
>
_________________________________________________________________
Your E-mail and More On-the-Go. Get Windows Live Hotmail Free.
http://clk.atdmt.com/GBL/go/171222985/direct/01/
------------------------------
_______________________________________________
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 521
****************************************
Read previous mail | Read next mail
| |
