September 2012 - AMSAT-BB - mailman.amsat.org

Re: 1962-09-12: JFK's Challenge
by andy thomas 12 Sep '12

12 Sep '12

Thank you for the link. I have read JFK's speech before, but never seen the delivery. A great man. I was 8 years old when he was murdered. I was making Christmas decorations with my mother in the kitchen, we had no money for decorations so we were cutting out silver stars from the foil tops of milk bottles. She cried, and told me he was a good man, and so, did I. My father, a police officer (later GW1MLA, SK), a few days after watched the Jack Ruby incident, and said, that was wrong, too. 73 de andy g0sfj

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1962-09-12: JFK's Challenge
by B J 12 Sep '12

12 Sep '12

http://www.nasa.gov/multimedia/videogallery/index.html?media_id=151776051 73s Bernhard VA6BMJ @ DO33FL

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Re: Camera on antenna
by Louis McFadin 12 Sep '12

12 Sep '12

I use a camera mounted on the support strut of the dish feed. It is pointed at the center of the dish. Then I simply point the dish at the sun and make corrections to az and el until the shadow is exactly in the center of the dish. Then use those corrections in MacDoppler. Works great! No risk to the camera by looking at the sun. Lou McFadin W5DID w5did(a)cfl.rr.com On Sep 11, 2012, at 3:00 PM, amsat-bb-request(a)amsat.org wrote: > Send AMSAT-BB mailing list submissions to > amsat-bb(a)amsat.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://amsat.org/mailman/listinfo/amsat-bb > or, via email, send a message with subject or body 'help' to > amsat-bb-request(a)amsat.org > > You can reach the person managing the list at > amsat-bb-owner(a)amsat.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of AMSAT-BB digest..." > > > Today's Topics: > > 1. Re: e: Satellite technical question (i8cvs) > 2. Re: Camera on an antenna (i8cvs) > 3. Re: Camera on an antenna (Robert Bruninga) > 4. Re: PROITERES (Simon Pack) > 5. Microwave Spectrum Issues at EME 2012 (Trevor .) > 6. Re: Camera on an antenna (i8cvs) > 7. Re: PROITERES (GW1FKY(a)aol.com) > 8. Proiteres (PY5LF) > 9. AMSAT-UK Symposium streaming this year? (Alan P. Biddle) > 10. Increasing Popularity Of CubeSats (B J) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 10 Sep 2012 23:31:55 +0200 > From: "i8cvs" <domenico.i8cvs(a)tin.it> > To: "Nick Pugh" <quadpugh(a)bellsouth.net>, "Amsat - BBs" > <amsat-bb(a)amsat.org> > Subject: [amsat-bb] Re: e: Satellite technical question > Message-ID: <00a801cd8f9b$b42c08e0$0301a8c0@b3o7f1> > Content-Type: text/plain; charset="iso-8859-1" > > Hi Nick , > > The equivalent noise temperature of an antenna do not depends by it's > phisical temperature but only by the noise temperature emitted by the > object that the main lobe of the antenna is looking. > > The equivalent noise temperature of the antenna radiation resistance > do not depends by the phisical temperature of the antenna but only > by the noise temperature emitted by the object that the main lobe of > the antenna is looking. > > As an example, if you install a parabolic dish on the Nort Pool at very low > temperature and a similar parabolic dish in the desert at the equator at > high temperature and you point both the antennas toward the Sun than the > received Sun Noise will be the same no matter the structural temperature > of both dishes will be. > > Of coarse only the phisical temperature of the antenna preamplifiers and > all the associated receivers phisical temperature must be the same. > > 73" de > > i8CVS Domenico > > ----- Original Message ----- > From: "Nick Pugh" <quadpugh(a)bellsouth.net> > To: "'Nick Pugh'" <quadpugh(a)bellsouth.net>; <amsat-bb(a)amsat.org> > Sent: Sunday, September 09, 2012 8:15 PM > Subject: [amsat-bb] Re: e: Satellite technical question > > > I am sorry I did not mean the physical temperature What I wanted is the > equivalent noise temperature. > > Thanks for those who replied > > nick > > -----Original Message----- > From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] On > Behalf Of Nick Pugh > Sent: Sunday, September 09, 2012 10:07 AM > To: amsat-bb(a)amsat.org > Subject: [amsat-bb] e: Satellite technical question > > e: Satellite technical question > > Assume a cubesat with a monopole ? wave antenna at 400 mhz. The satellite is > in full sun with a 500km orbit. What is the antenna temperature in full sun > and in eclipse? > > TNX in advance > > Nick CAPE Team > > > > > ------------------------------ > > Message: 2 > Date: Mon, 10 Sep 2012 23:51:49 +0200 > From: "i8cvs" <domenico.i8cvs(a)tin.it> > To: "James Luhn" <luhn(a)wt.net>, "Amsat - BBs" <amsat-bb(a)amsat.org> > Subject: [amsat-bb] Re: Camera on an antenna > Message-ID: <00e601cd8f9e$7b8aa160$0301a8c0@b3o7f1> > Content-Type: text/plain; charset="iso-8859-1" > > Hi James, W5AOO > > To mount a camera on a beam in order to locate the moon to work > EME is a very bad procedure. > > The correct procedure is to point the antenna system toward the Sun > and get the maximum Sun Noise on receiver. > > As soon the maximum Sun Noise is received please calibrate the > Azimuth and the Elevation of your control box relative to the Sun > position. > > If the control box is well calibrated with the position of the Sun than > it will be very well calibrated also for the Moon position. > > I use the above procedure for my antenna system and I am very happy > with it. > > 73" de > > i8CVS Domenico > > ----- Original Message ----- > From: "James Luhn" <luhn(a)wt.net> > To: <amsat-bb(a)amsat.org> > Sent: Saturday, September 08, 2012 7:22 PM > Subject: [amsat-bb] Camera on an antenna > > >> Please don't ya'll laugh too hard at me. Has anyone ever mounted a >> camera on a beam? Now I am not trying to see AO40, but I would like to >> simply double check the location of my beam for eme. If anyone has >> mounted a camera on a beam, I would be interested in what you used. >> Yes, I know all about beam width vs the moon. I just hate to call CQ >> with my beams pointed to the ground due to some Murphy type of failure. >> >> 73, >> -james >> W5AOO > > > > ------------------------------ > > Message: 3 > Date: Mon, 10 Sep 2012 18:20:17 -0400 > From: Robert Bruninga <bruninga(a)usna.edu> > To: i8cvs <domenico.i8cvs(a)tin.it>, James Luhn <luhn(a)wt.net>, Amsat - > BBs <amsat-bb(a)amsat.org> > Subject: [amsat-bb] Re: Camera on an antenna > Message-ID: <1b5ce3bfd15b891e21cf699dcd03b84f(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > I'd say that differently... > > Nothing wrong with using the camera. But your point is well taken to > calibrate the camera to the BEAM by first pointing at the sun. Then (if > your camera survives) the camera is a perfectly good aiming device for the > moon and it eliminates any errors in the Antenna controller and pots. Bob > > -----Original Message----- >> To mount a camera on a beam in order to locate the moon >> to work EME is a very bad procedure. > >> The correct procedure is to point the antenna system >> toward the Sun and get the maximum Sun Noise on receiver. > >> As soon the maximum Sun Noise is received please calibrate >> the Azimuth and the Elevation of your control box relative >> to the Sun position. > > > ----- Original Message ----- > From: "James Luhn" <luhn(a)wt.net> > To: <amsat-bb(a)amsat.org> > Sent: Saturday, September 08, 2012 7:22 PM > Subject: [amsat-bb] Camera on an antenna > > >> Please don't ya'll laugh too hard at me. Has anyone ever mounted a >> camera on a beam? Now I am not trying to see AO40, but I would like to >> simply double check the location of my beam for eme. If anyone has >> mounted a camera on a beam, I would be interested in what you used. >> Yes, I know all about beam width vs the moon. I just hate to call CQ >> with my beams pointed to the ground due to some Murphy type of failure. >> >> 73, >> -james >> W5AOO > > _______________________________________________ > Sent via AMSAT-BB(a)amsat.org. 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 Sep 2012 23:54:22 +0100 > From: "Simon Pack" <simon(a)pack.demon.co.uk> > To: <amsat-bb(a)amsat.org> > Subject: [amsat-bb] Re: PROITERES > Message-ID: <1AB624654F2949D5A4A7F6F2BD32D0A7@server> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > > Hi All, > > I too was listening for PROITERES, and made a recording today (Sep 10th > 11:15UTC) using my FunCube Dongle. > Looking at the spectrum display, I could see the distinctive pattern of two > satellites transmitting. > It turns out that the orbit of SEEDS II (CO-66) was almost in perfect > alignment with PROITERES, and was also transmitting its morse code beacon on > 437.485MHz. > I heard 'JQ1YGU SEEDS G4 3475BFB0 D83 FFE CCA 189 8ED 35F' etc. from SEEDS. > See http://cubesat.aero.cst.nihon-u.ac.jp/english/seeds_2_e.html > > It is possible that some people listening for PROITERES today have actually > mistakenly heard SEEDS II, as I found it a few dB stronger at times. > The two satellites will drift apart over the next 2 days. > > 73's Simon G7WIQ > > > > ------------------------------ > > Message: 5 > Date: Mon, 10 Sep 2012 23:54:43 +0100 (BST) > From: "Trevor ." <m5aka(a)yahoo.co.uk> > To: amsat-bb(a)amsat.org > Subject: [amsat-bb] Microwave Spectrum Issues at EME 2012 > Message-ID: > <1347317683.71911.YahooMailClassic(a)web132205.mail.ird.yahoo.com> > Content-Type: text/plain; charset=utf-8 > > The spectrum issues faced by moon-bounce (EME) operators are similar to those affecting the Amateur-satellite Service, see this video made by volunteers from the British Amateur Television Club (BATC) > > http://www.uk.amsat.org/?p=10253 > > 73 Trevor M5AKA > > > > > ------------------------------ > > Message: 6 > Date: Tue, 11 Sep 2012 01:21:58 +0200 > From: "i8cvs" <domenico.i8cvs(a)tin.it> > To: "Robert Bruninga" <bruninga(a)usna.edu>, "James Luhn" <luhn(a)wt.net>, > "Amsat - BBs" <amsat-bb(a)amsat.org> > Subject: [amsat-bb] Re: Camera on an antenna > Message-ID: <001501cd8fab$14e76120$0301a8c0@b3o7f1> > Content-Type: text/plain; charset="iso-8859-1" > > Hi Bob, > > Using a calibrated camera on the Sun is a good system to point the > antenna on the Moon only when there are no clods and when the > sky is clear. > > On the other side a well calibrated control box on the Sun Noise is a > goood system to point the antenna at the Moon with any wheader > condition even with clods and this make the difference. > > 73" de > > i8CVS Domenico > > ----- Original Message ----- > From: "Robert Bruninga" <bruninga(a)usna.edu> > To: "i8cvs" <domenico.i8cvs(a)tin.it>; "James Luhn" <luhn(a)wt.net>; "Amsat - > BBs" <amsat-bb(a)amsat.org> > Sent: Tuesday, September 11, 2012 12:20 AM > Subject: RE: [amsat-bb] Re: Camera on an antenna > > >> I'd say that differently... >> >> Nothing wrong with using the camera. But your point is well taken to >> calibrate the camera to the BEAM by first pointing at the sun. Then (if >> your camera survives) the camera is a perfectly good aiming device for the >> moon and it eliminates any errors in the Antenna controller and pots. Bob >> >> -----Original Message----- >>> To mount a camera on a beam in order to locate the moon >>> to work EME is a very bad procedure. >> >>> The correct procedure is to point the antenna system >>> toward the Sun and get the maximum Sun Noise on receiver. >> >>> As soon the maximum Sun Noise is received please calibrate >>> the Azimuth and the Elevation of your control box relative >>> to the Sun position. >> >> >> ----- Original Message ----- >> From: "James Luhn" <luhn(a)wt.net> >> To: <amsat-bb(a)amsat.org> >> Sent: Saturday, September 08, 2012 7:22 PM >> Subject: [amsat-bb] Camera on an antenna >> >> >>> Please don't ya'll laugh too hard at me. Has anyone ever mounted a >>> camera on a beam? Now I am not trying to see AO40, but I would like to >>> simply double check the location of my beam for eme. If anyone has >>> mounted a camera on a beam, I would be interested in what you used. >>> Yes, I know all about beam width vs the moon. I just hate to call CQ >>> with my beams pointed to the ground due to some Murphy type of failure. >>> >>> 73, >>> -james >>> W5AOO >> >> _______________________________________________ >> Sent via AMSAT-BB(a)amsat.org. 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: Mon, 10 Sep 2012 20:49:42 -0400 (EDT) > From: GW1FKY(a)aol.com > To: simon(a)pack.demon.co.uk, amsat-bb(a)amsat.org > Subject: [amsat-bb] Re: PROITERES > Message-ID: <5f53.664a2d51.3d7fe4a6(a)aol.com> > Content-Type: text/plain; charset="US-ASCII" > > Hi Simon, > Thanks for the clarification - That was exactly what I experienced and was > rather confused until I played back > a short recording and realised that I was not having a receiver problem. > Regards > Ken > GW1FKY > > ------------------------------ > > Message: 8 > Date: Mon, 10 Sep 2012 22:44:10 -0300 > From: "PY5LF" <py5lf(a)falautomation.com.br> > To: <AMSAT-BB(a)amsat.org> > Subject: [amsat-bb] Proiteres > Message-ID: <002c01cd8fbe$f21c1fa0$d6545ee0$(a)falautomation.com.br> > Content-Type: text/plain; charset="us-ascii" > > Hi > > Proiteres signal heard a few minutes ago ; > > http://www.youtube.com/watch?v=Dx4WnoQ_CTk > > 73 > > > > > > PY5LF > > Luciano Fabricio > > Curitiba-PR-BR GG54jm > > > > > > ------------------------------ > > Message: 9 > Date: Tue, 11 Sep 2012 08:06:42 -0500 > From: "Alan P. Biddle" <APBIDDLE(a)UNITED.NET> > To: "AMSAT-BB" <amsat-bb(a)amsat.org> > Subject: [amsat-bb] AMSAT-UK Symposium streaming this year? > Message-ID: <5E54F74916E248BA9A991BF71C2C84AB@WA4SCA> > Content-Type: text/plain; charset="us-ascii" > > Hi, > > In the past, BATC has streamed the symposium. Will they be doing so this > year? > > Alan > WA4SCA > > > ----------------------------------- > > We haven haven't got the money, > so we we've got to think. > > Lord Rutherford > > > > > ------------------------------ > > Message: 10 > Date: Tue, 11 Sep 2012 16:03:32 +0000 > From: B J <va6bmj(a)gmail.com> > To: amsat-bb <amsat-bb(a)amsat.org> > Subject: [amsat-bb] Increasing Popularity Of CubeSats > Message-ID: > <CAP7QzkMNHu5wCE7O8WGQB8xXAE8vsNJ2N+3_BKCuAttyLOM27A(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > http://thespacereview.com/article/2155/1 > > 73s > > Bernhard VA6BMJ @ DO33FL > > > ------------------------------ > > _______________________________________________ > Sent via amsat-bb(a)amsat.org. 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 7, Issue 295 > ****************************************

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e: Satellite technical question
by Nick Pugh 12 Sep '12

12 Sep '12

e: Satellite technical question Assume a cubesat with a monopole ¼ wave antenna at 400 mhz. The satellite is in full sun with a 500km orbit. What is the antenna temperature in full sun and in eclipse? TNX in advance Nick CAPE Team

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swr explained
by Nick Pugh 12 Sep '12

12 Sep '12

Hi all I ran across a Bell Lab video on SWR. He shows a mechanical analog to describe transmission line. I recommend viewing to your students. In a few minutes he describes what it took me months to understand. Nick url http://www.youtube.com/watch?v=DovunOxlY1k

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ITAR & Spanish Lunar Robot Launch
by Trevor . 11 Sep '12

11 Sep '12

Moon Daily has just reported on the announcement in August of a Spanish Lunar robot launch by Beijing in 2014. I suspect it uses amateur frequencies but I don't know for certain, anyone have any information ? http://www.moondaily.com/reports/Chinese_firm_to_send_Spanish_rover_to_moon… The original announcement by the Spanish team back in August is at http://www.googlelunarxprize.org/teams/barcelona-moon-team/blog/galactic-su… It highlights the impact of the 1990's US ITAR regulations. We well know the adverse impact on Amateur Radio from ITAR, but it also affects US commercial interests in that organizations world-wide now make a point of avoiding the purchase of US products. Hopefully the damaging impact on trade will help speed the end of ITAR as far as satellite technology is concerned. 73 Trevor M5AKA

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Increasing Popularity Of CubeSats
by B J 11 Sep '12

11 Sep '12

http://thespacereview.com/article/2155/1 73s Bernhard VA6BMJ @ DO33FL

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Proiteres
by PY5LF 11 Sep '12

11 Sep '12

Hi Proiteres signal heard a few minutes ago ; http://www.youtube.com/watch?v=Dx4WnoQ_CTk 73 PY5LF Luciano Fabricio Curitiba-PR-BR GG54jm

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Re: PROITERES
by GW1FKY＠aol.com 11 Sep '12

11 Sep '12

Hi Simon, Thanks for the clarification - That was exactly what I experienced and was rather confused until I played back a short recording and realised that I was not having a receiver problem. Regards Ken GW1FKY

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Camera on an antenna
by James Luhn 10 Sep '12

10 Sep '12

Please don't ya'll laugh too hard at me. Has anyone ever mounted a camera on a beam? Now I am not trying to see AO40, but I would like to simply double check the location of my beam for eme. If anyone has mounted a camera on a beam, I would be interested in what you used. Yes, I know all about beam width vs the moon. I just hate to call CQ with my beams pointed to the ground due to some Murphy type of failure. 73, -james W5AOO

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