| |
CX2SA > SATDIG 25.02.13 21:22l 396 Lines 14177 Bytes #999 (0) @ WW
BID : AMSATBB862
Read: GUEST
Subj: AMSAT-BB-digest V8 62
Path: IZ3LSV<F1OYP<ON0AR<DB0RES<WA7V<CX2SA
Sent: 130225/2022Z @:CX2SA.SAL.URY.SA #:3758 [Salto] FBB7.00e $:AMSATBB862
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. phased array (Howie DeFelice)
2. Re: STRaND-1 Live feed from Surrey (Jean-Pierre Godet)
3. STRaND-1 Keps? (Ken Swaggart)
4. Re: [amsat-dc] inquiry about homebrew az-el systems (Samudra
Haque) (Samudra Haque)
5. STRaND-1 and AAUSAT3 Heard over Delft (Wouter Weggelaar)
6. Re: inquiry about homebrew az-el systems
(Ing. Pavel Milanes Costa)
7. Re: STRaND-1 Keps? (Trevor .)
----------------------------------------------------------------------
Message: 1
Date: Mon, 25 Feb 2013 13:42:46 -0500
From: Howie DeFelice <howied231@xxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] phased array
Message-ID: <BLU169-W1565AAB774BD3C40304979E7F30@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Samudra,
Phased array is a generic term. Stacked yagi's are a phased array :) If you
mean electrically steered phased arrays, that's another story. If you mean
non-steered phase arrays, that is also another story. As far as I know there
has not been much work in the amateur community on electrically steered
arrays. For that matter they are not that common in the commercial world
either. Even the current Ku/Ka band antenna's used on commercial aircraft
for inflight Internet use mechanically steered antenna's. If you meant an
array of patches to produce a flat panel antenna that had less mass than a
yagi, these are really only practical at frequencies higher than UHF
considering the gain to patch area ratio.
Howie AB2S
------------------------------
Message: 2
Date: Mon, 25 Feb 2013 18:56:06 +0000 (UTC)
From: Jean-Pierre Godet <godetj@xxxxxxx.xx>
To: "Trevor ." <m5aka@xxxxx.xx.xx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: STRaND-1 Live feed from Surrey
Message-ID: <alpine.DEB.2.02.1302251848070.1794@xxxxxxx.xxx>
Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
Good evening Trevor,
Sorry nothing heard here North of France, same thing with UniBRITE and
AAUsat-3 till now. We are waiting for the next pass.
Jean-Pierre/F5YG
--
Powered by Linux (Adafruit Occidentalis 0.2 on Raspberry Pi - kernel 3.1.9)
On Mon, 25 Feb 2013, Trevor . wrote:
> Nothing heard in UK on last pass.
>
> Surrey tweet possibility the satellite OBC reset and went into it's 45min
quite time again. Going through scenarios and debugging.
>
> Expected next pass soon in next 90mins. Keep trying if possible!! Live
feed from our ground station #STRaND1
>
> Live video feed from Surrey is at
> http://www.youtube.com/watch?v=WrWCQ9506B8&feature=plcp
>
> ---
> Keep listening to 437.568 MHz +/- Doppler.
> Keps at http://amsat-uk.org/satellites/strand-1/strand-1-telemetry/
>
> Has anyone heard the other sats that were deployed ?
> http://www.amsat-uk.org/?p=12180
>
> 73 Trevor M5AKA
>
> _______________________________________________
> 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: 3
Date: Mon, 25 Feb 2013 11:04:56 -0800
From: "Ken Swaggart" <k.swaggart@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] STRaND-1 Keps?
Message-ID: <ADDD5916719A47098E88C2C9FCA20ADE@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Anyone have post-launch STRaND-1 keps that seem fairly close?
Tnx,
Ken, W7KKE
------------------------------
Message: 4
Date: Mon, 25 Feb 2013 14:19:24 -0500
From: Samudra Haque <samudra.haque@xxxxx.xxx>
To: pat@xxxxxxxxx.xxx
Cc: Amsat-bb <amsat-bb@xxxxx.xxx>, "amsat-dc@xxxxx.xxxx
<amsat-dc@xxxxx.xxx>
Subject: [amsat-bb] Re: [amsat-dc] inquiry about homebrew az-el
systems (Samudra Haque)
Message-ID:
<CAJEM476KP8AvDyWCeH7iXarv2mWzR8RD2OstBrXNSTpD2jY_Pw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Thanks Pat, I'm going to have to spend a bit of time after two weeks from
present to collate all the work done to date in a methodical analysis and
see if there is any trend, or benefit to a particular design and what the
options are for small batch kit form production.
73 de X
On Mon, Feb 25, 2013 at 2:09 PM, Pat Kilroy <pat@xxxxxxxxx.xxx> wrote:
> Hi Samudra,
>
> Gosh, here are some of the oodles of plans
> out there for different az-el antenna pointing
> solutions to get you started. See below.
>
> I'm sorry I don't have info on motor suppliers
> or the other items you mention. Hope these
> might be helpful none the less to you and
> others.
>
> Cheers,
>
> Pat Kilroy
> N8PK
>
> From ANS-020 released Saturday, January 19,
> mainly introducing our Workshop on Portable
> Satellite Ground Stations, but includes buried
> nuggets on antennas and az-el:
>
> Links for antenna ideas:
> http://arrowantennas.com/
> http://www.elkantennas.com/
> http://www.g6lvb.com/homebrewarrow.htm
> http://www.amsat.org/amsat-new/information/faqs/crow/index.php
> http://www.amsat.org/amsat-new/echo/Az_El_Pos.pdf
> http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf
> http://www.amsat.org/amsat-new/tools/downloads/iROTOR.pdf
> http://www.arrl.org/shop/The-ARRL-Satellite-Handbook/
> http://ac6v.com/antprojects.htm
> Links for software ideas:
> http://www.amsat.org/amsat-new/tools/software.php
> http://www.amsat.org/amsat-new/tools/
> http://www.moetronix.com/spectravue.htm
> http://www.amsat.org/amsat-new/information/faqs/resguide.pdf
> http://sdrsharp.com/
>
> From ANS-048 released Saturday, February 16:
> http://www.vk3um.com and http://www.vk5dj.com/satellite.html and then
> derived:
>
>
http://www.muratamems.fi/sites/default/files/documents/sca61t_inclinometer_dat
asheet_8261900a2_0.pdf
> and
>
http://www.digikey.com/product-detail/en/SCA61T-FA1H1G-1/551-1005-1-ND/751309
>
> The LVB Tracker Box by Howard Long, G6LVB:
> http://store.amsat.org/catalog/product_info.php?products_id=63
>
> From ANS-041 released Saturday, February 9:
> ANS Archives
> http://amsat.org/pipermail/ans/
>
> Me? I must be choosy on which wheels I re-invent,
> especially when I need proven/reliable operations
> out of a station component, such as Az-El motion.
> I use a heavy duty camera tripod to steer portable
> antennas, and I cheated and got the Yaesu G-5500
> combo ($730) for portable, semi-portable and fixed
> operations:
> http://www.hamradio.com/detail.cfm?pid=H0-002765
>
>
> -----Original Message-----
> From:amsat-dc-request@xxxxx.xxx
> Sent: Sunday, February 24, 2013 03:00 PM
> To: amsat-dc@xxxxx.xxx
> Subject: AMSAT-DC Digest, Vol 8, Issue 13
>
> Send AMSAT-DC mailing list submissions to amsat-dc@xxxxx.xxx To subscribe
> or unsubscribe via the World Wide Web, visit
> http://amsat.org/mailman/listinfo/amsat-dc or, via email, send a message
> with subject or body 'help' to amsat-dc-request@xxxxx.xxx You can reach
> the person managing the list at amsat-dc-owner@xxxxx.xxx When replying,
> please edit your Subject line so it is more specific than "Re: Contents of
> AMSAT-DC digest..." Today's Topics: 1. inquiry about homebrew az-el systems
> (Samudra Haque)
> ----------------------------------------------------------------------
> Message: 1 Date: Sat, 23 Feb 2013 18:59:35 -0500 From: Samudra Haque To: "
> amsat-dc@xxxxx.xxxx , Amsat-bb Subject: [amsat-dc] inquiry about homebrew
> az-el systems Message-ID: Content-Type: text/plain; charset=ISO-8859-1 Hi,
> about two years ago, I started a design for a robotics class project of a
> AZ-EL rotator controller system, and a hardware package for the mechanism
> for rotating an antenna in any direction sub!
> ject to mechanical stops. The system would have been able to handle
> regular and flip modes. I didn't do anything more than calculations, and
> moved on to building a classroom instructional robot then. Lately, as I am
> setting up (K3GWU, the George Washington University Amateur Radio Club and
> Research Station) I find that the price of az-el systems such as G5500 +
> Yaesu AZ-EL rotors are expensive, and are not typically available on an
> affordable basis on Ebay or eham.net etc. Well, of course, expensive is a
> relative term, for a student hobby organization, it's a lot, and I guess
> for small ham operators it is also moderately expensive. This may be a
> frequently asked topic: does any one have experienced with (tested) kit
> designs for AZ-EL rotors that can be made with parts from current suppliers
> ? I know there are a number of controller designs, but I am interested to
> know if there are any options for suppliers of the required gears/motors
> etc. I have located several large AC mo!
> tors / DC motors at my university mechanical engineering workshop, but
> they are not all guaranteed the same specs. I now realize if I do embark
> on a actual design process with my model/simulation/hardware, it would be
> nice to build several of these all at once to share the development cost
> over the production run, and ensure those who want a cheap AZ-EL system can
> get one. Otherwise the production cost of one heavy duty system is going to
> be quite high. I hope some of you may have suggestions for me, both (+) and
> (-) or perhaps (~) in nature. I thought amsat / amateur radio folks have a
> common need to encourage homebrew activity to keep their brain cells in
> working condition? I'm opening this question up to the national US
> audience, and welcome any discussion on the challenges of making the
> ever-so-important azimuth-elevation rotor. I've studied some of the
> alternatives: Alliance U100 and Yaesu G-5500. I think we can do better in
> 2013. But ideally, to allow the wide adoption of AMSAT ground stations,
> what price point would the system have to b!
> e to make it worth building ? 73 de N3RDX George Washington University
> ------------------------------
> _______________________________________________ AMSAT-DC mailing list
> courtesy of AMSAT-NA AMSAT-DC@xxxxx.xxx
> http://amsat.org/mailman/listinfo/amsat-dc End of AMSAT-DC Digest, Vol 8,
> Issue 13 ***************************************
>
>
> _______________________________________________
> Via the AMSAT-DC mailing list courtesy of AMSAT-NA
> AMSAT-DC@xxxxx.xxx
> http://amsat.org/mailman/listinfo/amsat-dc
>
------------------------------
Message: 5
Date: Mon, 25 Feb 2013 20:21:31 +0100
From: Wouter Weggelaar <wouterweg@xxxxx.xxx>
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] STRaND-1 and AAUSAT3 Heard over Delft
Message-ID:
<CAKXf1rErujweJp_Ri4eVDyzZpn2F==HSO+Ruw07wqeT+5Hzijw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi All,
On the 19:10 UTC pass both STRaND-1 and AAUSAT3 Have been received at
the ISIS office in Delft. I was using some experimental receivers for
this. The STRaND-1 beacon is nice and loud and I measured quite a nice
SNR (20+ dB)
I used the following KEPS:
STRaND
1 44871U 58056A 13056.56369708 .00000000 00000-0 +10239-3 0 334
2 44871 98.7067 247.0547 0006435 302.9022 57.1261 14.35120889200890
Congratulations to the STRaND and AAUSAT3 teams for this great
success! I hope to see more mission results in the near future.
Wouter Weggelaar
PA3WEG
------------------------------
Message: 6
Date: Mon, 25 Feb 2013 14:41:16 -0500
From: "Ing. Pavel Milanes Costa" <pavel@xxxxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: inquiry about homebrew az-el systems
Message-ID: <512BBE5C.70200@xxxxx.xx>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
Hi to all...
I'm involved on a task like these...
Building a super-cheap AL-EL rotator...
I'm in Cuba (FL11ai), No RadioShack or ANY other store for electronics
hobbyist... even common pics or LCD screens are rare items here...
Talking with my local hams I have managed to get my hands on a 10 years
old surveillance camera made in Japan...
The unit is full waterproof and with more than 10 years in service, it
have some age marks on the outside but it's shinny new on the inside...
this could be a good start up point...
It have full 360 in azimuth with end switches and only 0-140 degrees on
the elevation plane, the local ham who give this item to me use one for
move a 7 elements full aluminum Yagui for 2m... for more than 3 years
now. (no position system, just visual aim)
I'm thinking in a kind of gray-encoder for position sensing on the rotor
to a parallel port of my PC and the software will be my debut on python
software (learn python is one of my personal goal this year, and this
project is the perfect start...)
just my 5 cents...
73 de CO7WT.
Pavel Milanes Costa.
FL11ai
El 23/02/13 22:41, Lizeth Norman escribi?:
> Samudra,
> This is a good question for a first year engineering student like
> myself: How does one bring home the best bang for the buck out of an
> engineering dollar?
------------------------------
Message: 7
Date: Mon, 25 Feb 2013 19:42:18 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: STRaND-1 Keps?
Message-ID:
<1361821338.12680.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Last ones I had were here
http://amsat-uk.org/satellites/strand-1/strand-1-telemetry/
73 Trevor M5AKA
--- On Mon, 25/2/13, Ken Swaggart <k.swaggart@xxxxxxx.xxx> wrote:
> From: Ken Swaggart <k.swaggart@xxxxxxx.xxx>
> Subject: [amsat-bb] STRaND-1 Keps?
> To: amsat-bb@xxxxx.xxx
> Date: Monday, 25 February, 2013, 19:04
> Anyone have post-launch STRaND-1 keps
> that seem fairly close?
>
> Tnx,
> Ken, W7KKE
>
> _______________________________________________
> 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 member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 8, Issue 62
***************************************
Read previous mail | Read next mail
| |
