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CX2SA > SATDIG 15.05.08 03:14l 546 Lines 16946 Bytes #999 (0) @ WW
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Sent: 080515/0115Z @:CX2SA.LAV.URY.SA #:3078 [Minas] FBB7.00e $:3078_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: AO-51 mode V/S (Alan)
2. Organised Chaos. (John Hackett)
3. AMSAT-UK Colloquium - 2nd Call for Speakers/Papers
(David Johnson)
4. Re: Ham Radio (Robert Smith)
5. UK DX on short notice AO7 (w7lrd(AT)comcast.net)
6. General Astrodynamics Library v0.2.0 (Paul Willmott)
7. Re: AO-51 V/S mode (Rm2642(AT)aol.com)
8. Re: AMSAT-UK Colloquium - 2nd Call for Speakers/Papers
(G0MRF(AT)aol.com)
9. Re: AO-51 mode V/S (francesco messineo)
10. Re: AO-51 mode V/S (i8cvs)
----------------------------------------------------------------------
Message: 1
Date: Tue, 13 May 2008 14:13:32 -0500
From: "Alan" <ve4yz(AT)mts.net>
Subject: [amsat-bb] Re: AO-51 mode V/S
To: <Rm2642(AT)aol.com>, <amsat-bb(AT)amsat.org>
Message-ID: <25972A05867B40AB8CF375E264312CB7(AT)athlon>
Content-Type: text/plain; charset="us-ascii"
Hi all... my 2 cents...
Lots of sites for DIY signal sources such as
http://ve2zaz.net/SigSourc/SigSourc.htm
I have the K5GNA Gardiner signal source and find it too strong. You sure
can tell whether your system is on or off. But when in comes to building
your own 2.4 helix or patch antennae I can't attenuate enough and have the
source and antenna within my house. Gardiner might be great at 1 km :-) I
can check my roof top down converter and helix 30 feet directly above my
basement shack with the Gardiner. The signal is directly into the side of
the helix and fully quiets the 2M receiver. But in my house that signal is
everywhere... bouncing of off ducting, freezers, wash machines and who knows
what else.
To fine tune and compare various tweaks of a DIY projects to a known source,
and in a known direction, I like a real weak source. Nothing like finding
out that you made a helix or a patch that receives best when aimed 20
degrees off target :-) and somehow you have a humongous null in the middle.
Fortunately I have an old PC that has a real nice weak signal near 144 MHz
after down converting. So my in-house, basement antenna range, is now about
10 meters long and the bounced signals and lobes of any design are almost
too weak to monitor.
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of Rm2642(AT)aol.com
Sent: May 13, 2008 10:54 AM
To: amsat-bb(AT)amsat.org
Subject: [amsat-bb] Re: AO-51 mode V/S
Unfortunately, I had no success with the AO-51 V/S mode this past week.
Before the next V/S mode operation comes around, I want to double check
performance of my antenna and downconverter. Some of the folks in the UK
had these items available during AO-40 days but don't think they're
available today, such as:
_http://www.uk.amsat.org/index.php?option=com_content&task=view&id=252&Itemi
d=
86_
(http://www.uk.amsat.org/index.php?option=com_content&task=view&id=252&Itemi
d=86)
I've seen Bob's K5GNA 2.4GHz Source
on eBay with the:
_http://cgi.ebay.com/2-4-GHz-SIGNAL-SOURCE-GARDINER-TYPE-LO2398-AMSAT_W0QQit
em
Z110251114382QQcmdZViewItem_
(http://cgi.ebay.com/2-4-GHz-SIGNAL-SOURCE-GARDINER-TYPE-LO2398-AMSAT_W0QQit
emZ110251114382QQcmdZViewItem)
Are there other small modular type 2.4Ghz Sources out there that I can use
to verify downlink setup?
Thanks,
Ron
N6PAA
**************Wondering what's for Dinner Tonight? Get new twists on family
favorites at AOL Food.
(http://food.aol.com/dinner-tonight?NCID=aolfod00030000000001)
_______________________________________________
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: 2
Date: Tue, 13 May 2008 19:14:57 +0200
From: John Hackett <archie.hackett(AT)hotmail.com>
Subject: [amsat-bb] Organised Chaos.
To: "Eu-amsat(AT)yahoogroups.com" <eu-amsat(AT)yahoogroups.com>
Cc: allan_gm1sxx(AT)hotmail.com, amsat-bb(AT)amsat.org
Message-ID: <BLU138-W392C6B2CFCD2855F1CD61E91CF0(AT)phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
In 17 years of satellite operating - and literally thousands of QSO's, I'm
proud of the fact that I have actually had 2 - (that's two, folks) - QSO's on
FM. I believe the last one was W3SM/OE on AO-27 about 10 years ago.
For want of something better to do today I went outside with my arrow aerial,
a MYCOM handheld scanner and a little IC-E91 (also handheld) to have a listen
to AO-51 ... (I've heard it described as a "zoo").
I monitored the 16:15Z pass over Russia/LA/Europe/UK and what I heard can only
be described as the worst operating I've heard in 41 years of radio.
There were stations battling it out with the mine's bigger than yours
mentality, stations "hogging" it, constantly calling CQ, CQ, CQ, CQ, CQ, CQ,
CQ, CQ, CQ, CQ ... pause for breath ... CQ, CQ, CQ, CQ, CQ, CQ, CQ, CQ, CQ ...
(no callsign given but obviously a Russian station), Several stations replied
to this gentleman but he was obviously *NOT* hearing them. There was the
'obligatory' awwwwwla, awwwwwla, awwwwwla, awwwwwwla - (the mic-shy gentleman
who can't find his downlink).
(Don't these clowns have receivers ??.....LA2QAA)
AO-51, what a wonderful resource for showing the non-amateur listeners that
these operators are fully competant to operate an emergency network like the
one mentioned planned for Intelsat.
I'm absolutely convinced !!! Intelsat will welcome such operating with open
arms!.
My (non-amateur) neighbour's immediate comment was - "I'm glad my !!! life
doesn't depend on you lot, it sounds like a fox loose in a henhouse".
I'm ashamed to say, I absolutely agree with him.
I also sincerely hope that the standard of operating (read: disipline/
proceedure) is better in North America than it is in Europe - actually, I've
listened via N1DID and Echolink, as well as the promo video so I know it is.
73 John. <la2qaa(AT)hotmail.com>
------------------------------
Message: 3
Date: Tue, 13 May 2008 18:45:53 +0100
From: David Johnson <dave(AT)g4dpz.me.uk>
Subject: [amsat-bb] AMSAT-UK Colloquium - 2nd Call for
Speakers/Papers
To: AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <155B4896-47D4-436B-81E1-E6A3CE5C93F5(AT)g4dpz.me.uk>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
Hi Folks,
This is the second call for speakers for the 22nd Amsat-UK Colloquium
which will be held at Surrey University, Guildford, Surrey, U.K.,
from Friday 25th July to Sunday 27th July 2008.
Details of this and previous events can be found at: http://
www.uk.amsat.org/
Amsat-UK invite speakers, about amateur radio space and associated
activities, for this event. They are also invited to submit papers
for the "Proceedings" document which will be published at the same
time but printed papers are not mandatory. We normally prefer
authors to present talks themselves rather than having someone else
give them in the authors' absence. We also welcome
"unpresented" papers for the Proceedings document.
Offers of talks should be submitted as soon as possible; the final
date for full documents to be received is late-June 2008 in order
that the "Proceedings" document be available to participants.
Submissions should be sent *ONLY* to G4DPZ, via the following routes:
Internet e-mail: dave (AT) g4dpz dot me dot uk
SnailMail: QTHR from http://www.qrz.com
AMSAT-UK also invite anyone with requests for Program Topics to
submit them as soon as possible to G4DPZ. Invitations for any
papers on specific subjects will be included in the future call.
Likewise if anyone knows of a good speaker, please send contact
and other information to G4DPZ.
73
Dave
G4DPZ
------------------------------
Message: 4
Date: Tue, 13 May 2008 11:01:18 -1000
From: "Robert Smith" <dukenuke(AT)pixi.com>
Subject: [amsat-bb] Re: Ham Radio
To: "Miyuki Smith-Richardson" <SmithM(AT)hbdlawyers.com>
Cc: "Amsat-Bb(AT)Amsat. Org" <amsat-bb(AT)amsat.org>
Message-ID: <007501c8b53c$7e275030$2f01a8c0(AT)HPOWER>
Content-Type: text/plain; charset="iso-8859-1"
Ham RadioHey
What about the main course??? Disneyland/s
plus Blues house.
dad
----- Original Message -----
From: Miyuki Smith-Richardson
To: Robert Smith
Sent: Tuesday, May 13, 2008 10:30 AM
Subject: RE: Ham Radio
i can't read yours either. super small. ihave to blow it up.
skip bodyworlds because i will throw up for sure.
im still looking into magic castle.
------------------------------------------------------------------------------
From: Robert Smith [mailto:dukenuke(AT)pixi.com]
Sent: Tuesday, May 13, 2008 1:29 PM
To: Miyuki Smith-Richardson
Subject: Re: Ham Radio
Yeah
Pretty weird. Nothing like a nice hot lunch right afterwords!!
This is ur legal font on my side. I hope I spelled everything right because
I sure can't read it
dad
865 South Figueroa Street
Suite 2900
Los Angeles, California 90017
Telephone: (213) 694-1200
Facsimile: (213) 694-1234
______________________________________________________________________________
__________________
This e-mail was sent by a law firm and may contain information that
is privileged or confidential. If you are not the intended recipient,
please
delete the e-mail and any attachments and notify us immediately.
Thank you.
______________________________________________________________________________
__________________
------------------------------
Message: 5
Date: Tue, 13 May 2008 20:31:05 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] UK DX on short notice AO7
To: AMSAT-BB(AT)amsat.org (AMSAT-BB)
Message-ID:
<051320082031.18845.4829FA890007C95D0000499D22165499760B9D04C999(AT)comc
ast.net>
Content-Type: text/plain
Hello Gents
We have a mutual footprint (really short) at 2155Z on AO-7 from the UK to
Seattle Wa. cn87, at 2155Z. Downlink 145.958. Look for me> Thanks.
73 Bob W7LRD
Seattle
--
"if this were easy, everyone would be doing it"
------------------------------
Message: 6
Date: Tue, 13 May 2008 18:36:45 -0300
From: Paul Willmott <pwillmott(AT)northrock.bm>
Subject: [amsat-bb] General Astrodynamics Library v0.2.0
To: amsat-bb(AT)amsat.org
Message-ID: <4C3F72C8-2EC6-425F-A6F0-93EA0E182C50(AT)northrock.bm>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
The latest version of the General Astrodynamics Library has been
released. Version 0.2.0 can be downloaded from:
http://homepage.mac.com/pclwillmott/GAL/Download.html
New features in this release include:
SGP4 orbit propagator based upon David Vallado's combined SGP4/SDP4
model.
Additional time conversion routines
ITRF-GCRF-ITRF position and velocity reference frame transforms based
upon IAU2000A/B & IAU2006A resolutions.
Gravity model support added
Ellipsoid model support added.
The General Astrodynamics Library (GAL) is a numerical library for C
and C++ programmers. It is free software under the GNU General Public
License.
The library provides a wide range of astrodynamical routines such as
ephemerides, earth orientation, and orbit propagation. There are over
210 functions in total with an extensive test suite.
Next up numerical orbit propagation.
------------------------------
Message: 7
Date: Tue, 13 May 2008 20:56:55 EDT
From: Rm2642(AT)aol.com
Subject: [amsat-bb] Re: AO-51 V/S mode
To: amsat-bb(AT)amsat.org
Message-ID: <c4e.32a353db.355b92d7(AT)aol.com>
Content-Type: text/plain; charset="US-ASCII"
Thanks to all regarding assembly kits and hardware for a 2.4Ghz Source. Your
response was overwhelming. Choices are many. Thanks again. Ron N6PAA
**************Wondering what's for Dinner Tonight? Get new twists on family
favorites at AOL Food.
(http://food.aol.com/dinner-tonight?NCID=aolfod00030000000001)
------------------------------
Message: 8
Date: Wed, 14 May 2008 02:11:49 EDT
From: G0MRF(AT)aol.com
Subject: [amsat-bb] Re: AMSAT-UK Colloquium - 2nd Call for
Speakers/Papers
To: amsat-bb(AT)amsat.org
Message-ID: <d4e.27fe1b76.355bdca5(AT)aol.com>
Content-Type: text/plain; charset="US-ASCII"
Dave.
Re your call for papers.
The e-mail address just bounces.
Thanks
David G0MRF
----- The following addresses had permanent fatal errors -----
<dave(AT)g4dpz.me.uk>
----- Transcript of session follows -----
451 4.4.1 reply: read error from mailserver.g4dpz.me.uk.
<dave(AT)g4dpz.me.uk>... Deferred: Connection timed out with
mailserver.g4dpz.me.uk.
Message could not be delivered for 3 hours
Message will be deleted from queue
Final-Recipient: RFC822; dave(AT)g4dpz.me.uk
Action: failed
------------------------------
Message: 9
Date: Wed, 14 May 2008 09:09:22 +0200
From: "francesco messineo" <francesco.messineo(AT)gmail.com>
Subject: [amsat-bb] Re: AO-51 mode V/S
To: "George Henry" <ka3hsw(AT)earthlink.net>
Cc: amsat-bb(AT)amsat.org
Message-ID:
<d9f2bc20805140009j2341b9c7s2fd8f903425a40d2(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hello,
On 5/13/08, George Henry <ka3hsw(AT)earthlink.net> wrote:
> You can use any oscillator module, such as from an old PC motherboard, that
will put out harmonics up in the 2.4 GHz range. I happened to find a 24.000
MHz one on an old MB. Just now, looking around in the junk drawer, I found
ones for 4.000 and 16.000 MHz as well. Add 5 volts and a short piece of wire
on the output pin, and you're good to go.
>
I can confirm, I used a 50 MHz xtal oscillator and I have a very
strong armonic signal at 2400 MHz.
hth
73
Francesco IZ8DWF
------------------------------
Message: 10
Date: Wed, 14 May 2008 15:16:23 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: AO-51 mode V/S
To: "francesco messineo" <francesco.messineo(AT)gmail.com>, "George
Henry" <ka3hsw(AT)earthlink.net>
Cc: AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <003d01c8b5c4$b5d03dc0$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "francesco messineo" <francesco.messineo(AT)gmail.com>
To: "George Henry" <ka3hsw(AT)earthlink.net>
Cc: <amsat-bb(AT)AMSAT.Org>
Sent: Wednesday, May 14, 2008 9:09 AM
Subject: [amsat-bb] Re: AO-51 mode V/S
> Hello,
>
> On 5/13/08, George Henry <ka3hsw(AT)earthlink.net> wrote:
> > You can use any oscillator module, such as from an old PC motherboard,
that will put out harmonics up in the 2.4 GHz range. I happened to find a
24.000 MHz one on an old MB. Just now, looking around in the junk drawer, I
found ones for 4.000 and 16.000 MHz as well. Add 5 volts and a short piece
of wire on the output pin, and you're good to go.
> >
>
> I can confirm, I used a 50 MHz xtal oscillator and I have a very
> strong armonic signal at 2400 MHz.
>
> hth
> 73
> Francesco IZ8DWF
Hi Francesco, IZ8DWF
To test if your 2400 MHz receiving system is suitable or not to receive a
satellite signal you don't need a strong armonic signal because a XTAL
signal source tell you only if you are correctly in frequency but very
small in sensitivity of your receiving system because in general the output
power of the source is too high and uncalibrated.
My XTAL signal source (G0MRF type) feeding directly a half wave
dipole has an output power of - 28 dBm measured at 2400.408 MHz
The overall noise figure of my receiving system is 0.7 dB equivalent to
a noise temperature Te = 51 kelvin
When the elevation of my 1.2 meters dish is zero degrees the feed get a
noise level from the ground of about 290 kelvin
In this condition the equivalent noise temperature Tsys of this receiving
system is 51+290 = 341 kelvin and the calculated noise floor with the IF
receiver switched to SSB in a BW of 2500 Hz is -139 dBm
With the above sensitivity if I plan to receive with a S/N= + 15 dB my
- 28 dBm signal source connected to a dipole while using my 27 dBi dish
I must put my signal source in a free line of sight about 20 km away from
my dish as calculation shows.
Please note that a received signal of + 15 dB over the noise is a very
good signal for SSB as tell the experience with OSCAR-10, OSCAR-13
and AO40
Power of Signal Source ................... - 28.00 dBm
Gain of Signal Source dipole........... + 2.14 dB
-------------
Signal Source EIRP........................... - 25.86 dBm
Attenuation 2.4 GHz over 20 km..... - 126.00 dB
------------
Power received on isotropic ant......... - 151.86 dBm
Gain of 1.2 m dish.............................. + 27.00 dB
-----------
Available power at RX input.............. - 124.86 dBm
RX noise floor with ant. connected.. - 139.00 dBm
-----------
S/N ratio of received signal.............. + 14.14 dB
I hope this helps
73" de
i8CVS Domenico
------------------------------
_______________________________________________
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
End of AMSAT-BB Digest, Vol 3, Issue 244
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