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CX2SA > SATDIG 12.09.12 23:12l 805 Lines 25058 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. ITAR & Spanish Lunar Robot Launch (Trevor .)
2. Re: Camera on antenna (Louis McFadin)
3. Re: ITAR & Spanish Lunar Robot Launch (Gus 8P6SM)
4. swr explained (Nick Pugh)
5. Re: e: Satellite technical question (Nick Pugh)
6. Re: AMSAT-UK Symposium streaming this year? (Jim List)
7. Re: Camera on antenna (i8cvs)
8. 1962-09-12: JFK's Challenge (B J)
----------------------------------------------------------------------
Message: 1
Date: Tue, 11 Sep 2012 23:16:50 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ITAR & Spanish Lunar Robot Launch
Message-ID:
<1347401810.97897.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
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_in
_2014_999.html
The original announcement by the Spanish team back in August is at
http://www.googlelunarxprize.org/teams/barcelona-moon-team/blog/galactic-suite
-signs-contract-chinese-launcher-send-rover-moon-june
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
------------------------------
Message: 2
Date: Tue, 11 Sep 2012 21:37:09 -0400
From: Louis McFadin <w5did@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Camera on antenna
Message-ID: <80C1455A-3079-4A6B-8368-13A2100B5867@xxx.xxx>
Content-Type: text/plain; charset=us-ascii
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@xxx.xx.xxx
On Sep 11, 2012, at 3:00 PM, amsat-bb-request@xxxxx.xxx wrote:
> Send AMSAT-BB mailing list submissions to
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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@xxx.xxxx
> 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@xxx.xx>
> To: "Nick Pugh" <quadpugh@xxxxxxxxx.xxx>, "Amsat - BBs"
> <amsat-bb@xxxxx.xxx>
> Subject: [amsat-bb] Re: e: Satellite technical question
> Message-ID: <00a801cd8f9b$b42c08e0$0301a8c0@xxxxxx>
> 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@xxxxxxxxx.xxx>
> To: "'Nick Pugh'" <quadpugh@xxxxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
> 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@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Nick Pugh
> Sent: Sunday, September 09, 2012 10:07 AM
> To: amsat-bb@xxxxx.xxx
> 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@xxx.xx>
> To: "James Luhn" <luhn@xx.xxx>, "Amsat - BBs" <amsat-bb@xxxxx.xxx>
> Subject: [amsat-bb] Re: Camera on an antenna
> Message-ID: <00e601cd8f9e$7b8aa160$0301a8c0@xxxxxx>
> 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@xx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> 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@xxxx.xxx>
> To: i8cvs <domenico.i8cvs@xxx.xx>, James Luhn <luhn@xx.xxx>, Amsat -
> BBs <amsat-bb@xxxxx.xxx>
> Subject: [amsat-bb] Re: Camera on an antenna
> Message-ID: <1b5ce3bfd15b891e21cf699dcd03b84f@xxxx.xxxxx.xxx>
> 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@xx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> 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@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 Sep 2012 23:54:22 +0100
> From: "Simon Pack" <simon@xxxx.xxxxx.xx.xx>
> To: <amsat-bb@xxxxx.xxx>
> Subject: [amsat-bb] Re: PROITERES
> Message-ID: <1AB624654F2949D5A4A7F6F2BD32D0A7@xxxxxx>
> 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@xxxxx.xx.xx>
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Microwave Spectrum Issues at EME 2012
> Message-ID:
> <1347317683.71911.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
> 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@xxx.xx>
> To: "Robert Bruninga" <bruninga@xxxx.xxx>, "James Luhn" <luhn@xx.xxx>,
> "Amsat - BBs" <amsat-bb@xxxxx.xxx>
> Subject: [amsat-bb] Re: Camera on an antenna
> Message-ID: <001501cd8fab$14e76120$0301a8c0@xxxxxx>
> 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@xxxx.xxx>
> To: "i8cvs" <domenico.i8cvs@xxx.xx>; "James Luhn" <luhn@xx.xxx>; "Amsat -
> BBs" <amsat-bb@xxxxx.xxx>
> 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@xx.xxx>
>> To: <amsat-bb@xxxxx.xxx>
>> 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@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: Mon, 10 Sep 2012 20:49:42 -0400 (EDT)
> From: GW1FKY@xxx.xxx
> To: simon@xxxx.xxxxx.xx.xxx amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: PROITERES
> Message-ID: <5f53.664a2d51.3d7fe4a6@xxx.xxx>
> 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@xxxxxxxxxxxxx.xxx.xx>
> To: <AMSAT-BB@xxxxx.xxx>
> Subject: [amsat-bb] Proiteres
> Message-ID: <002c01cd8fbe$f21c1fa0$d6545ee0$@xxxxxxxxxxxxx.xxx.xx>
> 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@xxxxxx.xxx>
> To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
> Subject: [amsat-bb] AMSAT-UK Symposium streaming this year?
> Message-ID: <5E54F74916E248BA9A991BF71C2C84AB@xxxxxx>
> 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@xxxxx.xxx>
> To: amsat-bb <amsat-bb@xxxxx.xxx>
> Subject: [amsat-bb] Increasing Popularity Of CubeSats
> Message-ID:
> <CAP7QzkMNHu5wCE7O8WGQB8xXAE8vsNJ2N+3_BKCuAttyLOM27A@xxxx.xxxxx.xxx>
> Content-Type: text/plain; charset=ISO-8859-1
>
> http://thespacereview.com/article/2155/1
>
> 73s
>
> Bernhard VA6BMJ @ DO33FL
>
>
> ------------------------------
>
> _______________________________________________
> 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 7, Issue 295
> ****************************************
------------------------------
Message: 3
Date: Tue, 11 Sep 2012 19:16:10 -0400
From: Gus 8P6SM <8p6sm@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: ITAR & Spanish Lunar Robot Launch
Message-ID: <504FC63A.10104@xxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 09/11/2012 06:16 PM, Trevor . wrote:
> 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 ?
Why wouldn't it? It seems anyone building a small satellite for any
purpose these days automatically uses the ham bands for their telemetry
and telecommand channels. No actual amateur functionality need
necessarily be included.
--
73, de Gus 8P6SM
The Easternmost Isle
------------------------------
Message: 4
Date: Wed, 12 Sep 2012 03:26:18 -0500
From: "Nick Pugh" <quadpugh@xxxxxxxxx.xxx>
To: "George T" <gt@xxxxxxxxx.xxx>, "'Robert R. Henry'"
<henry@xxxxxxxxx.xxx>, <PaulDarby@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Cc: 'UL CAPE Mailing List' <cape@xxxxx.xxxxxx.xxx>
Subject: [amsat-bb] swr explained
Message-ID: <021901cd90c0$49e3d140$ddab73c0$@xxx>
Content-Type: text/plain; charset="us-ascii"
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
------------------------------
Message: 5
Date: Wed, 12 Sep 2012 03:48:55 -0500
From: "Nick Pugh" <quadpugh@xxxxxxxxx.xxx>
To: "'i8cvs'" <domenico.i8cvs@xxx.xx>, "'Amsat - BBs'"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: e: Satellite technical question
Message-ID: <022401cd90c3$72237040$566a50c0$@xxx>
Content-Type: text/plain; charset="iso-8859-1"
Thanks Domenico
for the reply. You are correct the physical temperature and the equivalent
noise temperature are not related. Bob wb4apr suggested that a 1/4 wave
antenna in LEO has a noise equivalent temperature of ~ 150 k . What is the
consensus of the group ? We are trying to do an uplink budget and one of
the variables is the system temperature.
nick
-----Original Message-----
From: i8cvs [mailto:domenico.i8cvs@xxx.xxx
Sent: Monday, September 10, 2012 4:32 PM
To: Nick Pugh; Amsat - BBs
Subject: Re: [amsat-bb] Re: e: Satellite technical question
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@xxxxxxxxx.xxx>
To: "'Nick Pugh'" <quadpugh@xxxxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
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@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Nick Pugh
Sent: Sunday, September 09, 2012 10:07 AM
To: amsat-bb@xxxxx.xxx
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: 6
Date: Wed, 12 Sep 2012 10:23:23 +0100
From: "Jim List" <jimlist@xxxxxx.xx.xxx>
To: <APBIDDLE@xxxxxxx.xxx>, "'AMSAT-BB'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AMSAT-UK Symposium streaming this year?
Message-ID: <005f01cd90c8$41d46570$c57d3050$@xx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi,
The BATC team will be there and will be making recordings of the
presentations. At the present time we are uncertain about live streaming as
we are uncertain about the quality of the hotels internet access. If its
good, then we will stream, otherwise we will try and upload to the server
asap after each presentation finishes.
73s Jim G3WGM
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Alan P. Biddle
> Sent: 11 September 2012 14:07
> To: AMSAT-BB
> Subject: [amsat-bb] AMSAT-UK Symposium streaming this year?
>
> 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
>
>
> _______________________________________________
> 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: Wed, 12 Sep 2012 17:51:10 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Louis McFadin" <w5did@xxx.xxx>, "Amsat - BBs"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Camera on antenna
Message-ID: <000001cd90ff$77779bc0$0301a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Louis McFadin" <w5did@xxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Wednesday, September 12, 2012 3:37 AM
Subject: [amsat-bb] Re: Camera on antenna
> 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@xxx.xx.xxx
Hi Lou, W5DID
Using the Sun light and point a camera on the Sun is not a good procedure
to calibrate the pointing of a dish for radio frequency signals because it
is possible that the radio frequency feed is mounted shifted a fraction of
degree making a big unwanted squint angle.
Depending on the squint angle of the radio frequency feed with respect to
the dish focal point it make a wrong pointing so that using the Sun light
and a camera you believe that your dish is looking exactly at the Sun but
in reality it can be not exactly pointed to get a radio frequency signal
source like the Sun Noise.
Particularly using large high gain dishes with sharp radiation lobe the
correct procedure is to calibrate the pointing vector of the dish to the
Sun using the Sun Noise and not a camera pointed to the Sun light.
The correct procedure is to use the Sun Noise to calibrate antennas and Sun
light to calibrate optical telescopes.
Also to work EME with high gain dishes with narrow main lobe the Azimut
and Elevation indication must be made not using position potentiometers but
more sophisticated and precision devices like position resolvers, or
position absolute encoders or selsyn indicators who permits high and
constant resolution of fraction degrees for many years.
For my 1.2 meters dish at 2.4 and 10.5 GHz I use not position potentiometers
but 2" surplus position selsyn motors originally used to point guns on board
of ships during the WWII
73" de
i8CVS Domenico
------------------------------
Message: 8
Date: Wed, 12 Sep 2012 18:43:59 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] 1962-09-12: JFK's Challenge
Message-ID:
<CAP7QzkO7NpK72hKrSLvcmTBORuXVms89eaojcQ2ARq+bBTQ8pQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
http://www.nasa.gov/multimedia/videogallery/index.html?media_id=151776051
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
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End of AMSAT-BB Digest, Vol 7, Issue 296
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