[amsat-bb] Re: Camera on antenna
Louis McFadin
w5did at mac.com
Tue Sep 11 18:37:09 PDT 2012
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 at cfl.rr.com
On Sep 11, 2012, at 3:00 PM, amsat-bb-request at amsat.org wrote:
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> 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 at 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 at tin.it>
> To: "Nick Pugh" <quadpugh at bellsouth.net>, "Amsat - BBs"
> <amsat-bb at amsat.org>
> Subject: [amsat-bb] Re: e: Satellite technical question
> Message-ID: <00a801cd8f9b$b42c08e0$0301a8c0 at 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 at bellsouth.net>
> To: "'Nick Pugh'" <quadpugh at bellsouth.net>; <amsat-bb at 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 at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of Nick Pugh
> Sent: Sunday, September 09, 2012 10:07 AM
> To: amsat-bb at 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 at tin.it>
> To: "James Luhn" <luhn at wt.net>, "Amsat - BBs" <amsat-bb at amsat.org>
> Subject: [amsat-bb] Re: Camera on an antenna
> Message-ID: <00e601cd8f9e$7b8aa160$0301a8c0 at 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 at wt.net>
> To: <amsat-bb at 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 at usna.edu>
> To: i8cvs <domenico.i8cvs at tin.it>, James Luhn <luhn at wt.net>, Amsat -
> BBs <amsat-bb at amsat.org>
> Subject: [amsat-bb] Re: Camera on an antenna
> Message-ID: <1b5ce3bfd15b891e21cf699dcd03b84f at 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 at wt.net>
> To: <amsat-bb at 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 at 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 at pack.demon.co.uk>
> To: <amsat-bb at amsat.org>
> Subject: [amsat-bb] Re: PROITERES
> Message-ID: <1AB624654F2949D5A4A7F6F2BD32D0A7 at 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 at yahoo.co.uk>
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Microwave Spectrum Issues at EME 2012
> Message-ID:
> <1347317683.71911.YahooMailClassic at 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 at tin.it>
> To: "Robert Bruninga" <bruninga at usna.edu>, "James Luhn" <luhn at wt.net>,
> "Amsat - BBs" <amsat-bb at amsat.org>
> Subject: [amsat-bb] Re: Camera on an antenna
> Message-ID: <001501cd8fab$14e76120$0301a8c0 at 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 at usna.edu>
> To: "i8cvs" <domenico.i8cvs at tin.it>; "James Luhn" <luhn at wt.net>; "Amsat -
> BBs" <amsat-bb at 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 at wt.net>
>> To: <amsat-bb at 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 at 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 at aol.com
> To: simon at pack.demon.co.uk, amsat-bb at amsat.org
> Subject: [amsat-bb] Re: PROITERES
> Message-ID: <5f53.664a2d51.3d7fe4a6 at 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 at falautomation.com.br>
> To: <AMSAT-BB at amsat.org>
> Subject: [amsat-bb] Proiteres
> Message-ID: <002c01cd8fbe$f21c1fa0$d6545ee0$@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 at UNITED.NET>
> To: "AMSAT-BB" <amsat-bb at amsat.org>
> Subject: [amsat-bb] AMSAT-UK Symposium streaming this year?
> Message-ID: <5E54F74916E248BA9A991BF71C2C84AB at 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 at gmail.com>
> To: amsat-bb <amsat-bb at amsat.org>
> Subject: [amsat-bb] Increasing Popularity Of CubeSats
> Message-ID:
> <CAP7QzkMNHu5wCE7O8WGQB8xXAE8vsNJ2N+3_BKCuAttyLOM27A at 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 at 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
>
>
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