| |
CX2SA > SATDIG 10.03.14 20:02l 492 Lines 15555 Bytes #999 (0) @ WW
BID : AMSATBB985
Read: GUEST
Subj: AMSAT-BB-digest V9 85
Path: IZ3LSV<IK2XDE<ON4HU<CX2ACB<CX2SA
Sent: 140310/1902Z @:CX2SA.SAL.URY.SA #:4182 [Salto] FBB7.00e $:AMSATBB985
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. GOT GRIDS? (wa4hfn@xxxxxxx.xxxx
2. Interview With Bob Twiggs, CubeSat Developer (B J)
3. Re: AO-40 Telemetry Audio Files (i8cvs)
4. Predict for LINUX notes (Andrew Rich)
5. OSCAR-11 Report (Clive Wallis)
6. OSCAR NEWS #205 (Graham Shirville)
7. Re: Two hundred 437 MHz satallites launch March 16 + WebSDR
(Howie DeFelice)
8. Fwd: [CubeSat] Announcement from George Washington University
- On-orbit Micropropulsion eXperiment Program (OMXP)
(Samudra Haque [GWU])
----------------------------------------------------------------------
Message: 1
Date: Sun, 9 Mar 2014 19:06:45 +0000 (UTC)
From: wa4hfn@xxxxxxx.xxx
To: AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] GOT GRIDS?
Message-ID:
<946285416.471260.1394392005662.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
Congratulations to Glenn AA5PK
He has completed the requirements for the GOT GRIDS ? AWARD # 1
WA4HFN Damon em55
------------------------------
Message: 2
Date: Sun, 9 Mar 2014 20:34:05 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Interview With Bob Twiggs, CubeSat Developer
Message-ID:
<CAP7QzkNvzM9bsPbQ+uBm0o_3b1-ZzMcqc9MRKd7Rj-k_9nyp7g@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
http://spaceflightnow.com/news/n1403/08cubesats/
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
Message: 3
Date: Mon, 10 Mar 2014 07:29:26 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Paul Willmott" <pwillmott@xxxxxxxxx.xx>, "AMSAT-BB"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-40 Telemetry Audio Files
Message-ID: <001801cf3c2a$16b5a610$0401a8c0@xxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Dear Paul , VP9MU
I hope you remember I was sending hundreds of AO40 telemetry 400 bps zipped
files but unfortunately I losted all of this in a fault of my old HD and
all I actually have are only many audio tape recorded of it.
BTW I have looked in Google under the voice "AO40 telemetry archive" and
there are a lot of TLM files for many years that you can get and use for
your experiments.
Have fun
73" de i8CVS Domenico
----- Original Message -----
From: "Paul Willmott" <pwillmott@xxxxxxxxx.xx>
To: <amsat-bb@xxxxx.xxx>
Sent: Sunday, March 09, 2014 6:41 PM
Subject: [amsat-bb] AO-40 Telemetry Audio Files
> If anyone has some audio recordings of AO-40 telemetry (regular or FEC)
(.WAV or .AIFF format), then please could you zip them and send them to me.
I need them for some experiments.
>
> email: pwillmott@xxxxxxxxx.xx
>
> Thanks
> Paul, VP9MU
>
>
> _______________________________________________
> 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: 4
Date: Mon, 10 Mar 2014 17:13:45 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Predict for LINUX notes
Message-ID: <201403100713.s2A7DrXx004581@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hello
I re-discovered predict for LINUX and wrote some notes
http://tech-software.net/predict/Predict_for_LINUX.pdf
Andrew VK4TEC
------------------------------
Message: 5
Date: Mon, 10 Mar 2014 10:45:10 +0000
From: Clive Wallis <clive@xxxxx.xx.xx>
To: amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] OSCAR-11 Report
Message-ID: <531D97B6.5030807@xxxxx.xx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
OSCAR-11 30th BIRTHDAY REPORT
OSCAR-11 (AKA UoSAT-2 and UO-11) celebrated it's 30th
birthday in space on 01 March! It was designed, built and
launched within a period of six months, using commercially
available 'off the shelf' components (COTS). Once again,
congratulations to Professor Sir Martin Sweeting G3YJO, his
team at the University of Surrey and the groups of radio
amateurs who also contributed to the project.
This report covers the period from 01 January 2013 to 05
March 2014. During this time there have been no significant
changes apart from the gradual drift of the on-board clock.
There was also an advance of one day in the displayed date.
This was caused by a known leap year problem in the date
chip, which has always existed since launch. Owing to the
large accumulated time/date error 29 February 2012 on the
satellite occurred in January 2013 on earth! The satellite
has been transmitting on a regular cycle of 10.35 days on
followed by 10.35 days off.
Good copy has been obtained obtained from decoded telemetry
frames and many reports have been posted on the DCARR
general satellite status website,
The satellite continues to be subjected to eclipses during
each orbit, resulting in weaker signals at those times.
During the winter in the UK the evening passes were in the
earth's shadow, and very weak signals have been received,
which could not be demodulated and could be only detected
with the receiver in CW mode . As the longer daylight hours
of summer approach, the evening passes in the UK should
gradually become clear of eclipses, resulting in stronger
signals. Eclipses are expected to continue until 2019.
The on-board clock gained 98 seconds during the 14 month
reporting period, which is comparable with the 60 seconds
gain per year when the satellite was launched. There is
however a large accumulated error of 307.54090 days slow.
This was caused mainly by the clock stopping during
eclipses, when there was also an unknown drain on the power
supply. The units of the least significant digit correspond
approximately to seconds (0.86 seconds actually).
At the present time, while OSCAR-11 is operating in a
predictable way, please DO NOT send reports or files by
e-mail. However, could all listeners continue to enter their
reports on the general satellite status website. This is a
very convenient and easy to use facility, which shows the
current status of all the amateur satellites, and is of use
to everyone. Reports around the expected times of switch-on
and switch-off are of special interest, especially for times
13:00 to 18:00 and 22:00 to 08:00 UTC, to when the satellite
is out-of-range in the UK . The URL is
http://oscar.dcarr.org/index.php
The VHF beacon frequency is 145.826 MHz. AFSK FM ASCII
Telemetry. The satellite is operating in the default mode,
controlled by the watchdog timer, with a cycle time of 20.7
days. 10.35 days on followed by 10.35 days off.
An extended version of this report is available on my
website, and new listeners to OSCAR-11 should read this for
further information. The URL is www.g3cwv.co.uk/oscar11.htm
. This page contains links to the report, a short audio clip
to help you identify the satellite and a file of recent
telemetry received. The website also contains an archive of
news & telemetry data which is updated from time to time,
and details about using a soundcard or hardware demodulators
for data capture. There is also software for capturing data,
and decoding ASCII telemetry.
The easiest way to check whether OSCAR-11 is operational is
to look at the General Satellite Status website
http://oscar.dcarr.org/index.php .
If you place this bulletin on a terrestrial packet network,
please use the bulletin identifier $BID:U2RPT159.CWV, to
prevent duplication.
73 Clive G3CWV xxxxx@xxxxx.xxx (please replace the x's by g3cwv)
------------------------------
Message: 6
Date: Mon, 10 Mar 2014 15:25:18 -0000
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] OSCAR NEWS #205
Message-ID: <045719E63BAA4CF5A265F90229B1CD15@xxxxxxx.xxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi All,
The next edition of OSCAR NEWS from AMSAT-UK is being prepared for
publication right now.
If you have any news or opinions that you would like to share please let us
have some text in the next ten days so that it may be included.
We are happy to accept articles of almost any length and we can deal with
most formats.
With all the many new launches that have taken place in the recent weeks
there must be many stories to tell and lessons learnt to share.
Thanks in advance
73
Graham G3VZV and Jim G3WGM
Interim editors of OSCAR NEWS
------------------------------
Message: 7
Date: Mon, 10 Mar 2014 12:51:59 -0400
From: Howie DeFelice <howied231@xxxxxxx.xxx>
To: Wouter Weggelaar <wouterweg@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Two hundred 437 MHz satallites launch March 16
+ WebSDR
Message-ID: <BLU169-W823AE4054BBDF2B75FD17E7740@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Wouter,
I personally agree with the ITU recommendations and think that CDMA/ spread
spectrum techniques can be useful for amateur satellite communications.
Unfortunately individual national regulatory entities (especially the U.S.
FCC) can take a very long time to adopt ITU recommendations. Current FCC
rules define three spreading sequences based on defined tapped linear
sequence generators; one 7 bit, one 13 bit and one 19 bit. That makes it
difficult to deploy an effective CDMA system. I am sure provisions could be
made for a STA ( special temporary authority) but I would anticipate this to
be an involved process.
I believe the current efforts by the ARRL to give amateurs more flexibility
by adopting maximum bandwidth restrictions vs maximum symbol rate
restrictions is a move in the right direction. If the purpose of amateur
radio is to advance the state of the art, the rules need to be flexible
enough to accommodate innovation.
Of course, these are just the opinions of one person. I am sure there are as
many opinions as there are subscribers to this list :) And yes, politics can
be a great attenuator to progress...
Howie, AB2S
Date: Sun, 9 Mar 2014 11:48:40 +0100
Subject: Re: [amsat-bb] Re: Two hundred 437 MHz satallites launch March 16 +
WebSDR
From: wouterweg@xxxxx.xxx
To: howied231@xxxxxxx.xxx
CC: damonwa4hfn@xxxxx.xxxx amsat-bb@xxxxx.xxx
Howie,
CDMA is actually actively promoted by the ITU. Indeed all the details have
to be published before launch, so everyone can demodulate it.
Citing from the ITU satellite-amateur
handbook:
"Amateur
and amateur-satellite systems should have technical characteristics
that provide worldwide interoperability, and allow origination, relay
and termination of communications independent of other radio
services. Design emphasis should be placed on reliability, robustness
and flexibility of reconfiguration for efficient emergency
communications. Multiple access techniques (FDMA, TDMA and CDMA)
should be selected for optimum spectrum efficiency and frequency
reuse. The selection of modulation techniques should take into
account resistance to interference and immunity to adverse
propagation conditions."
I have been researching this for the QB50 mission, but strong pressures
(mainly from the US) within the project killed the idea early on.
The US is now actively putting satellites in 70cm with experimental
licenses, which unfortunately means they could use CDMA without providing
the spreading codes. The (majority of the) rest of the world is still using
the amateur satellite service.
Using CDMA would be beneficial for sharing the spectrum, but required
coordination as well. I was trying to standardize the parameters (for QB50),
so the IARU could be handing out orthogonal codes to satellite teams, so
avoid clashes. But welcome to politics.....
Wouter PA3WEG
On Tue, Mar 4, 2014 at 10:16 PM, Howie DeFelice <howied231@xxxxxxx.xxx> wrote:
Yes, that is true, so are these licensed under an authority other than
amateur radio ? If they aren't then my questions stand.
Date: Tue, 4 Mar 2014 14:55:52 -0600
Subject: Re: [amsat-bb] Re: Two hundred 437 MHz satallites launch March 16 +
WebSDR
From: damonwa4hfn@xxxxx.xxx
To: howied231@xxxxxxx.xxx
CC: amsat-bb@xxxxx.xxx
70 CM is not just for the ham bands, it is a shared band check the
ruleswa4hfn Damon
On Tue, Mar 4, 2014 at 2:30 PM, Howie DeFelice <howied231@xxxxxxx.xxx> wrote:
Is CDMA an authorized emission type for the Amateur service? What is the
chipping rate/bandwidth of these? Don't the PRN sequences need to be made
public so as not to be classified as "encryption" ? Detailed specs on the
Sprites is in short supply. Has anyone done a link budget, seems like allot
of spreading gain is required to hear 10mW form a 300km orbit which
translates into allot of bandwidth in a part of the band usually reserved
for narrow band modes. The lack of transparency on many of these projects
that use the amateur bands seems to run against the spirit of amateur radio
in my opinion.
Howie
AB2S
_______________________________________________
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: 8
Date: Mon, 10 Mar 2014 12:53:43 -0400
From: "Samudra Haque [GWU]" <samudra@xxxxxx.xxx.xxx>
To: "samudra@xxx.xxxx <samudra@xxx.xxx>
Subject: [amsat-bb] Fwd: [CubeSat] Announcement from George Washington
University - On-orbit Micropropulsion eXperiment Program (OMXP)
Message-ID:
<CAJEM474G=mEo7irr-APV3=cSnXwvZnVGaksg0tntpyKAz00SOQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
[Hi, I am sending this note to all local mailing lists I am a part of, to
allow small satellite enthusiasts / experimenters to take advantage of our
research work at GWU. Perhaps you could forward it to your friendly
neighborhood educational institution and affiliate looking for a method to
put up long duration missions in space - and in most probability head past
Low Earth Orbit within a decent time frame - referrals requested - Samudra
N3RDX ]
3/10/2014
On behalf of the Micro-propulsion and Nanotechnology Laboratory, and Dr.
Michael Keidar, Professor of Mechanical and Aerospace Engineering at George
Washington University, I am attaching the formal announcement of OMXP.
I hope all of you will consider making use of this innovative program from
our laboratory to enable your institution's CubeSat projects to include one
or more channels of small form, efficient and safer electric propulsion
subsystem at very low cost.
If you are interested to know more details, or wish to discuss specialized
applications of (electric) micro-propulsion in CubeSats, please follow the
contact instructions in the attached PDF. We are in the process of setting
up an online application portal soon.
Regards to all.
--
Samudra Haque
Ph.D Student
Dept. of Mechanical and Aerospace Engineering
George Washington University
------------------------------
_______________________________________________
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 9, Issue 85
***************************************
Read previous mail | Read next mail
| |
