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CX2SA > SATDIG 08.08.12 21:15l 339 Lines 10188 Bytes #999 (0) @ WW
BID : AMSATBB7251
Read: GUEST
Subj: AMSAT-BB-digest V7 251
Path: IZ3LSV<IQ5KG<IK1NHL<CX2SA
Sent: 120808/1903Z @:CX2SA.SAL.URY.SA #:64685 [Salto] FBB7.00e $:AMSATBB7251
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. qrv on hf from Peru! (Lizeth Norman)
2. fo-29 tonight (Lizeth Norman)
3. Vermont Lunar Lander Ion Drive CubeSat aims for 2013 launch
(Trevor .)
4. Re: Technical question about radar reflectivity (g0mrf@xxx.xxxx
5. Hardware From Mars Science Laboratory Landing Located (B J)
6. Re: Radio Astronomer Sir Bernard Lovell, SK (i8cvs)
7. Re: Technical question about radar reflectivity (John Heath)
8. Re: Technical question about radar reflectivity (Thomas Doyle)
9. Re: Radio Astronomer Sir Bernard Lovell, SK (Jeff Moore)
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Message: 1
Date: Tue, 7 Aug 2012 14:41:34 -0500
From: Lizeth Norman <normanlizeth@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] qrv on hf from Peru!
Message-ID:
<CAJUhCTNuyuHFEWrCDGBG7Y9AyjQKEntBG7Bn+KT-zQKoqZWCFg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi all,
Received permission from the club to operate via hf from the club
station. Nice gear. Will listen up for anyone who needs Peru.
Feel free to repost as need be!
73 de Norm n3ykf
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Message: 2
Date: Tue, 7 Aug 2012 14:44:31 -0500
From: Lizeth Norman <normanlizeth@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] fo-29 tonight
Message-ID:
<CAJUhCTMNtAHa6OwLTPD4fpTrnBC7+-p0hQxfrM=SSh=VdsQ3pA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Will be qrv on the 0540z pass of fo-29. Can work this pass all the way
to the horizon due to it's azimuth.
73 de Norm n3ykf/oa4
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Message: 3
Date: Tue, 7 Aug 2012 22:20:42 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Vermont Lunar Lander Ion Drive CubeSat aims for
2013 launch
Message-ID:
<1344374442.92360.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Watch the presentation at http://www.uk.amsat.org/?p=9508
73 Trevor M5AKA
AMSAT-UK International Space Colloquium takes place Guildford Sept. 15-16
http://www.uk.amsat.org/colloquium/twelve
AMSAT-UK News on Twitter: http://twitter.com/AMSAT_UK
----
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Message: 4
Date: Tue, 7 Aug 2012 19:45:29 -0400 (EDT)
From: g0mrf@xxx.xxx
To: g.shirville@xxxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Technical question about radar reflectivity
Message-ID: <8CF430DDC0439A3-5A0-39BED@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="utf-8"; format=flowed
It's really cross sectional area rather than length. Can't really
assume military radar is on a specific frequency.
I think what perhaps should be avoided is the use of any angular
surfaces in the body designed to keep the cubesat either in orbit or to
help it pass through the atmosphere. i.e. sample return missions or
atmospheric 'skipping'
Similarly, the use of titanium and heat resistant ceramics should be
avoided although that is too specific for legislation. Perhaps....Not
designed for atmospheric re entry, would be better.
Sorry, back to the topic, angular surfaces and radar absorbing
coatings not a good idea.
Thanks es gl
David G0MRF
-----Original Message-----
From: Graham Shirville <g.shirville@xxxxxxxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Sent: Tue, 7 Aug 2012 22:32
Subject: [amsat-bb] Technical question about radar reflectivity
Hi All,
I am preparing a response to the UK Space Agency Consultation Document
on the
planned Reform of the UK Outer Space Act. Generally the proposals
appear to
support cubesat development here in the UK and therefore should be
supported.
Included in the Impact Assessment document that comes with the
Consultation
Document is a finding that ? Further, cubesat designers should be
encouraged to
incorporate appropriate reflectors on the outside of their platforms to
enhance
their radar cross-section/signatures and therefore their detectability
from the
ground in order to minimise the potential collision risk with other
operational
satellites.?
Would I be technically correct to be able to state something along the
lines
of... ?Many/most cubesat platforms have communication systems that use
frequencies in the 435-438MHz amateur satellite service and use
projecting 1/4
wave monopole or 1/2 wave dipole antennas. As these frequencies are
adjacent
to those used by many of the ground based radars used for tracking
space
objects, it can be demonstrated that this finding is being and will be
satisfied?
I assume that their reflection will be enhanced by these antennas but
want to
make certain of the facts ..... so expert comments please.
thanks
Graham
G3VZV
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------------------------------
Message: 5
Date: Wed, 8 Aug 2012 00:29:54 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Hardware From Mars Science Laboratory Landing
Located
Message-ID:
<CAP7QzkM4Wd24SFMGELxwA3+AofP4AnW0+u7DPBo_abQGxcWpUg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
http://www.nasa.gov/mission_pages/msl/multimedia/PIA16001.html
73s
Bernhard VA6BMJ @ DO33FL
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Message: 6
Date: Wed, 8 Aug 2012 03:26:18 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "andy thomas" <andythomasmail@xxxxx.xx.xx>, "Amsat - BBs"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Radio Astronomer Sir Bernard Lovell, SK
Message-ID: <000901cd7504$d0464ec0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Andy G0SFJ
I am very concerned about Radio Astronomer Sir Bernard
Lowell went SK.
I was in contact with him and his assistant Doctor Lascelles by
letter in 1960 when the ECHO-1 passive satellite was launched
and I received his VHF beacon at 108.000 and 108.003 MHz.
He was the Director of Radiotelescope of Jodrell Bank in UK
and he writes many technical compreensive articles about the
Radioastronomy one of that is "Radiotelescope looks back into
the aeons of the universe"
73" de
i8CVS Domenico
----- Original Message -----
From: "andy thomas" <andythomasmail@xxxxx.xx.xx>
To: <amsat-bb@xxxxx.xxx>
Sent: Tuesday, August 07, 2012 4:58 PM
Subject: [amsat-bb] Radio Astronomer Sir Bernard Lovell, SK
http://www.bbc.co.uk/news/uk-england-19164236
73 de andy g0sfj
_______________________________________________
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!
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------------------------------
Message: 7
Date: Wed, 8 Aug 2012 12:08:10 +0100 (BST)
From: John Heath <g7hia@xxxxxxxxxx.xxx>
To: Amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Technical question about radar reflectivity
Message-ID:
<1344424090.11818.YahooMailNeo@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Length might work if its a suitable fraction of the wavelength of the radar
signal.
See the British use of "Window" in the 1940's. Aluminium foil strips were
dropped from aircraft to confuse enemy radar.
?
73 John G7HIA
________________________________
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!
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------------------------------
Message: 8
Date: Wed, 8 Aug 2012 07:57:17 -0500
From: Thomas Doyle <tomdoyle1948@xxxxx.xxx>
To: John Heath <g7hia@xxxxxxxxxx.xxx>
Cc: Amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Technical question about radar reflectivity
Message-ID:
<CAHnRQRJNYhv9wCYroxBzea5TtqA6AB75ECyioO7ScfjZxTmsEA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
The issues faced by boaters are similar. Our sats even have the 'rough
seas' problem as they thrash about like drunken pirates.
http://www.duckworksmagazine.com/07/howto/radar/index.htm
73 W9KE Tom Doyle
On Wed, Aug 8, 2012 at 6:08 AM, John Heath <g7hia@xxxxxxxxxx.xxx> wrote:
> Length might work if its a suitable fraction of the wavelength of the
radar signal.
> See the British use of "Window" in the 1940's. Aluminium foil strips were
dropped from aircraft to confuse enemy radar.
>
> 73 John G7HIA
>
>
> ________________________________
> 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
--
Sent from my computer.
tom ...
------------------------------
Message: 9
Date: Wed, 08 Aug 2012 11:10:19 -0700
From: Jeff Moore <tnetcenter@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Radio Astronomer Sir Bernard Lovell, SK
Message-ID: <5022AB8B.3000501@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
What was his call sign???
Jeff Moore -- K E 7 A C Y
On 8/7/2012 7:58 AM, andy thomas wrote:
> http://www.bbc.co.uk/news/uk-england-19164236
>
> 73 de andy g0sfj
> _______________________________________________
> 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 7, Issue 251
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