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CX2SA > SATDIG 09.01.10 21:58l 988 Lines 29595 Bytes #999 (0) @ WW
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Sent: 100109/1955Z @:CX2SA.LAV.URY.SA #:31565 [Minas] FBB7.00e $:AMSATBB516
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Doppler effect (Daniel F6CDZ)
2. Re: what did I hear? (Mike Rupprecht)
3. Re: Doppler effect (Tony Langdon)
4. AO-7 QSO between PS8RF and ZS2BK (Pierre van Deventer)
5. Re: Galileo Contract Awarded (Oliver Amend)
6. Re: AO-7 QSO 7694 Km (Rich Dailey (Gmail))
7. Azimuth question (Randy)
8. WG: 7 Messages to H ope-1 BBS in one pass, with attached
files photos (1ST TIME) (Mike Rupprecht)
9. Re: Azimuth question (Ken Ernandes)
10. HAM RADIO UNIVERSITY (Peter)
11. Re: Azimuth question (Pete Rowe)
12. Re: Azimuth question (Art McBride)
13. Blackberry Tracking software (Angelo Glorioso)
14. Re: Blackberry Tracking software (Dave Webb KB1PVH)
15. Re: HAM RADIO UNIVERSITY (Greg D.)
16. Re: HAM RADIO UNIVERSITY (Nigel Gunn G8IFF/W8IFF)
17. Re: Azimuth question (Dave Guimont)
18. Re: Azimuth question (Bruce Bostwick)
19. Re: probably simple (Greg D.)
----------------------------------------------------------------------
Message: 1
Date: Sat, 9 Jan 2010 10:16:53 +0100
From: "Daniel F6CDZ" <daniel.f6cdz@xxxxxx.xx>
Subject: [amsat-bb] Doppler effect
To: <amsat-bb@xxxxx.xxx>
Message-ID: <005201ca910c$8bebec50$0a01a8c0@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hello to all.
My little contribution for an explanation about the doppler effect....
73, Daniel F6CDZ loc: JN39BE
Doppler effect
The Doppler effect is an immediate gap of the received frequency when the
distance varies between the point of broadcast and the point of reception.
The variation of frequency depends on the relative speed of link or on
estrangement between the satellite and the station ground, of the angle of
movement and the emitted frequency.
The Doppler effect varies with the position of the satellite on its orbit,
because the relative speed varies with this position.
The frequency increases when the satellite approaches, it decreases when it
goes away from the observer.
The "simple" formula is :
F real = F nom (1 + V/C)
V = relative speed of the sat on Km/s
C = light speed (300.000 Km/s)
1+ or 1- depending of the direction sat/operator (to the operator or
from the operator)
Mode NORmal and REVerse :
? NOR : if I increase 1 KHz on VHF, the UHF increases also of 3 KHz
=> total gap (+1 + +3) = + 4 KHz
? INV(REV) : if I increase 1 KHz on VHF, the UHF decreases of 3 KHz =>
total gap (+1 - 3) = - 2 KHz
------------------------------
Message: 2
Date: Sat, 9 Jan 2010 10:45:04 +0100
From: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>
Subject: [amsat-bb] Re: what did I hear?
To: "'francesco messineo'" <francesco.messineo@xxxxx.xxx>, "'AMSAT
BB'" <amsat-bb@xxxxx.xxx>
Message-ID: <000001ca9110$6c1c51e0$4454f5a0$@xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Frank,
probably you heard the CW beacon of RS-22.
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
Auftrag von francesco messineo
Gesendet: Samstag, 9. Januar 2010 09:49
An: AMSAT BB
Betreff: [amsat-bb] what did I hear?
Hi all,
I'm just listening for a SO-67 pass and the satellite seems not
operational at this time (8:40 UTC) but around 435.355 MHz +/- doppler
I started hearing a kind of cw telemetry in short intervals. They are
6 letter "packets" or so, like ISUN44. I didn't copy other packets as
I was busy trying to identify the satellite with the tracking program,
but it must not be one of my "favourite" ones.
What was I hearing?
Thanks
Frank IZ8DWF (currently in JM49MG).
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------------------------------
Message: 3
Date: Sat, 09 Jan 2010 21:08:14 +1100
From: Tony Langdon <vk3jed@xxxxx.xxx>
Subject: [amsat-bb] Re: Doppler effect
To: "Daniel F6CDZ" <daniel.f6cdz@xxxxxx.xx>, <amsat-bb@xxxxx.xxx>
Message-ID: <4b48559b.0e0bca0a.7906.1428@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 08:16 PM 1/9/2010, Daniel F6CDZ wrote:
> F real = F nom (1 + V/C)
>
>
>
>
>
> V = relative speed of the sat on Km/s
>
> C = light speed (300.000 Km/s)
Note that only the component of V that is towards or away from the
operator affects the frequency. For example, at TCA, the satellite
is still moving at around 7.5km/s relative to the observer, but the
motion is neither towards or away from the observer, so at that
instant, the Doppler shift is zero.
73 de VK3JED / VK3IRL
http://vkradio.com
------------------------------
Message: 4
Date: Sat, 9 Jan 2010 13:06:13 +0200
From: "Pierre van Deventer" <pierrevd@xxxx.xx.xx>
Subject: [amsat-bb] AO-7 QSO between PS8RF and ZS2BK
To: <AMSAT-BB@xxxxx.xxx>
Message-ID: <001f01ca911b$c202d330$46087990$@xx.xx>
Content-Type: text/plain; charset="us-ascii"
Congratulations to Piraja PS8RF and Andre ZS2BK for their world record
breaking two way SSB QSO over 7,694 km.
This is a mere 203 km short of the theoretical maximum of 7,907 km ??
Very well done on this great achievement !!
73, Pierre ZS6BB
------------------------------
Message: 5
Date: Fri, 08 Jan 2010 22:15:53 +0100
From: Oliver Amend <oliver.amend@xxx.xx>
Subject: [amsat-bb] Re: Galileo Contract Awarded
To: amsat-bb@xxxxx.xxx
Message-ID: <4B47A089.7050107@xxx.xx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Bob, Trevor:
Even if "OHB System AG" is not (yet) so well-know as SSTL to the community,
they have already supportet the Amateur radio community in several cases
with launch opportunities for "SAFIR-M (AO-49)" and "SAFIR-S".
There much are more than a hand-full licenzed OMs at OHB in Bremen
reating a fresh and initiative group under the club call DL0OHB.
There was already a long-year support for weather ballon launches in Germany
as well as an ongoing creation of digital ATV implementaions ("ARCOL") fo
future in-orbit solutions...
Also OHB will become more public in the next months and years not
only becasue of GALILEO...
Let's work together in that sense, there is a lot of space for in-orbit
activites ;-)
73 de Oliver DG6BCE
Am 08.01.2010 21:30, schrieb Bob McGwier:
> Trevor:
>
> You call it "the other issue" but it is the only issue. They do not
> give a tinker's damn if they interfere with us (and I suspect they
> won't) but the ability to sell receivers with CRAP for front ends (in
> terms of dynamic range, IMD, etc.) making it cheaper to manufacture is
> severely hampered by the "licensed stations" in adjacent bands. There
> will be regulatory relief sought for the "health and safety" etc.
> services provided by Galileo from those stinking pest hams who are
> simply obeying the law on their licensed systems.
>
> I am still of the opinion that this system serves no useful purpose
> whatsoever except to say "us too". It is a political impossibility to
> turn on SA now in my opinion but now there will be no need to at all. I
> suspect a treaty guaranteeing no SA and no allowance for design and sale
> of jamming equipment would be a LOT cheaper than this system.
>
> Bob
>
>
>
> Trevor . wrote:
>
>> --- On Fri, 8/1/10, Ulip ?eljko<Zeljko.Ulip@xxxxxxxx.xx> wrote:
>>
>>> Many congratulations to Sir Martin Sweeting and his team.
>>> But, what will be hapend with the 23 cm band world wide
>>> after Galileo system will be in the orbit?
>>> Please take a look to the document below:
>>>
http://galileo.khem.gov.hu/documents/angol/technikai_dokumentumok/status_of_ga
lileo_frequency_and_signal_design.pdf
>>>
>> It'll raise the noise floor which could affect satellite based 1260 MHz
receivers. The other issue could be the jamming of Galilleo GPS receivers by
Amateurs using 1260-1300 MHz, see
>>
>> Potential Interference To Galileo From 23cm Band Operations
>> http://www.southgatearc.org/articles/galileo.htm
>>
>> 73 Trevor M5AKA
>>
>>
>>
>>
>>
>> _______________________________________________
>> 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: 6
Date: Sat, 09 Jan 2010 07:17:30 -0500
From: "Rich Dailey (Gmail)" <redailey1@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-7 QSO 7694 Km
To: ps8rf Piraja <ps8rf@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <7.0.0.16.2.20100109071415.05533450@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Congratulations on your and Andre's achievement. No time for errors inside
a 30 second window! Enjoyed the video/audio as well.
Rich, N8UX
At 06:14 PM 1/8/2010, PS8RF wrote:
>I posted a short video with the contact maintained today with Andre, ZS2BK
via AO-7 in mode B ( Orbit 60848 - 19:47 UTC - 01/08/10 ). We keep the QSO
with a small window that the AO-7 has provided us. The window was only about
34 sec, this time interval we could not match any commit error. The distance
between the two stations is 4085 miles or 7669 Km.
>Andre wrote via email: "
>"My Doppler calc was also gratefully spot on. For example I calculated that
I should call so that my downlink is on 145.944.2 mhz
>I worked out that our Doppler difference would be 3.8 khz and amazing that
was spot-on. There is really no time to tune !"
>Andre is right the time was too little for adjustments. Taking also into
account that I manually worked the rotor and control of my rig.
>See the sound/video in youtube:
>http://www.youtube.com/watch?v=zNFmHERisWQ
------------------------------
Message: 7
Date: Sat, 9 Jan 2010 09:25:38 -0500
From: "Randy" <RSwart1@xxxxx.xx.xxx>
Subject: [amsat-bb] Azimuth question
To: <amsat-bb@xxxxx.xxx>
Message-ID: <001d01ca9137$a02f1770$04000100@xxxx>
Content-Type: text/plain; charset="us-ascii"
Is azimuth base on true or magnetic north
When lining up the antenna system for satellites?
When I looked it up, says true north.
Is that true for ALL satrellite tracking software?
One website says 12 degrees 58 seconds West is the magnetic declination.
So does that mean turn my antenna west by that amount from
Magnetic north?
Randy - N2CUA
------------------------------
Message: 8
Date: Sat, 9 Jan 2010 15:30:23 +0100
From: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>
Subject: [amsat-bb] WG: 7 Messages to H ope-1 BBS in one pass, with
attached files photos (1ST TIME)
To: "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Message-ID: <002a01ca9138$474c9dc0$d5e5d940$@xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Nader,
good job!
I was able to upload only one message today. It's very hard to do that in
Europe...
See the latest HO-68 directory here: http://www.dk3wn.info/p/?p=10753
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
Auftrag von Nader Omer
Gesendet: Freitag, 8. Januar 2010 23:38
An: amsat bb bb
Betreff: [amsat-bb] 7 Messages to H ope-1 BBS in one pass, with attached
files photos (1ST TIME)
I succceded to upload 7 messages to BBS on board hope-1 oscar satellite in
one
pass!
Orbit # 323
time 18:42- 19:02
date 8-01-2010
locator KK65GP
Messages to
dk3wn 2 messages one with attached photo
hb9ska
message to all
message to ba1du
message to w0sl
message to je9pel
see the photos for more
http://picasaweb.google.com/Nader.st2nh/7MessagesToHope1BbsInOnePassWithAtta
ched\
PhotoFile1stTime#
73 de??Nader ,?st2nh
?
www.st2nh.com
?
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------------------------------
Message: 9
Date: Sat, 9 Jan 2010 10:02:26 -0500
From: "Ken Ernandes" <n2wwd@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: <RSwart1@xxxxx.xx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <000601ca913c$c1e38860$45aa9920$@xxx>
Content-Type: text/plain; charset="us-ascii"
Azimuth is referenced to True North.
Some software might allow magnetic, but that would likely be an optional
alternative to true north.
73, Ken N2WWD
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Randy
Sent: Saturday, January 09, 2010 9:26 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Azimuth question
Is azimuth base on true or magnetic north When lining up the antenna system
for satellites?
When I looked it up, says true north.
Is that true for ALL satrellite tracking software?
One website says 12 degrees 58 seconds West is the magnetic declination.
So does that mean turn my antenna west by that amount from Magnetic north?
Randy - N2CUA
_______________________________________________
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------------------------------
Message: 10
Date: Sat, 09 Jan 2010 11:28:38 -0500
From: Peter <roi@xxxxxxxxx.xxx>
Subject: [amsat-bb] HAM RADIO UNIVERSITY
To: AMSAT-BB@xxxxx.xxx
Message-ID: <002201ca9149$150268c0$6901a8c0@xxxxx>
Content-Type: text/plain; charset=Windows-1252
HI:
I not available to work the SO-50, 1/10, 15:09 UTC pass for my HRU demo,
I'm needed as part of a panel discussion. I plan to work the 18:50UTC pass
of AO-27, thank you.
Trivia: What is the oldest Amateur Satellite in orbit?? I'm preparing for
my talk and I'm learning..
73,
Pete, WB2OQQ
------------------------------
Message: 11
Date: Sat, 9 Jan 2010 10:03:24 -0800 (PST)
From: Pete Rowe <ptrowe@xxxxx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: RSwart1@xxxxx.xx.xxxx amsat-bb@xxxxx.xxxxxxxx Ernandes
<n2wwd@xxxxxxxxxx.xxx>
Message-ID: <1162.65737.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I sight on the North Star for all of my antenna projects. Easy to do and
gets you right on (in the northern hemisphere, of course)
Pete
WA6WOA
--- On Sat, 1/9/10, Ken Ernandes <n2wwd@xxxxxxxxxx.xxx> wrote:
From: Ken Ernandes <n2wwd@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: RSwart1@xxxxx.xx.xxxx amsat-bb@xxxxx.xxx
Date: Saturday, January 9, 2010, 7:02 AM
Azimuth is referenced to True North.
Some software might allow magnetic, but that would likely be an optional
alternative to true north.
73, Ken N2WWD
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Randy
Sent: Saturday, January 09, 2010 9:26 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Azimuth question
Is azimuth base on true or magnetic north When lining up the antenna system
for satellites?
When I looked it up, says true north.
Is that true for ALL satrellite tracking software?
One website says 12 degrees 58 seconds West is the magnetic declination.
So does that mean turn my antenna west by that amount from Magnetic north?
Randy - N2CUA
_______________________________________________
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Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________
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Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 12
Date: Sat, 9 Jan 2010 10:16:36 -0800
From: "Art McBride" <kc6uqh@xxx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: <RSwart1@xxxxx.xx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <F10FC52FAAC44B76B9BEB5616F9F7025@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Randy,
True North is used as a reference. Magnetic North changes with observer
location and time. A user of Magnetic North is expected to make the
correction to True North. Some satellite prediction programs give position
of Sun and Moon to calibrate your antennas by knowing your Position and Time
Art, KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Randy
Sent: Saturday, January 09, 2010 6:26 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Azimuth question
Is azimuth base on true or magnetic north
When lining up the antenna system for satellites?
When I looked it up, says true north.
Is that true for ALL satrellite tracking software?
One website says 12 degrees 58 seconds West is the magnetic declination.
So does that mean turn my antenna west by that amount from
Magnetic north?
Randy - N2CUA
_______________________________________________
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
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database 4757 (20100109) __________
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__________ Information from ESET NOD32 Antivirus, version of virus signature
database 4757 (20100109) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
------------------------------
Message: 13
Date: Sat, 9 Jan 2010 18:26:57 +0000
From: Angelo Glorioso <n5uxt@xxxxxxx.xxx>
Subject: [amsat-bb] Blackberry Tracking software
To: AMSATBBS <amsat-bb@xxxxx.xxx>
Message-ID: <BAY138-W272039730082731BE2E69CED6F0@xxx.xxx>
Content-Type: text/plain; charset="Windows-1252"
Is there any Blackberry Satellite tracking software?
73 de Angelo
---------------------------------------------------------
If you don't ask, you will never know!!
_________________________________________________________________
Hotmail: Trusted email with Microsoft?s powerful SPAM protection.
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------------------------------
Message: 14
Date: Sat, 9 Jan 2010 13:51:24 -0500
From: Dave Webb KB1PVH <kb1pvh@xxxxx.xxx>
Subject: [amsat-bb] Re: Blackberry Tracking software
To: Angelo Glorioso <n5uxt@xxxxxxx.xxx>
Cc: AMSATBBS <amsat-bb@xxxxx.xxx>
Message-ID:
<4be5f191001091051q59838fcbu4866496adb72845b@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
I was wondering the same thing about the Android based phones.
Dave KB1PVH
Sent from my Verizon Wireless DROID
On Jan 9, 2010 1:41 PM, "Angelo Glorioso" <n5uxt@xxxxxxx.xxx> wrote:
Is there any Blackberry Satellite tracking software?
73 de Angelo
---------------------------------------------------------
If you don't ask, you will never know!!
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------------------------------
Message: 15
Date: Sat, 9 Jan 2010 11:21:14 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: HAM RADIO UNIVERSITY
To: <roi@xxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <BLU133-W26F29255D7672E921E3246A96F0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Pete,
So, you're probably not intending to have this be a trick question... The
oldest one that's still working is Oscar-7. The oldest one that's still in
orbit is - hmmm, not sure. I know the very first ones, Oscar-1, et al, as
well as many many more modern ones stopped working long ago, but how many of
them have re-entered?
Then there's the Moon (Oscar-zero)...
Greg KO6TH
> Date: Sat, 9 Jan 2010 11:28:38 -0500
> From: roi@xxxxxxxxx.xxx
> To: AMSAT-BB@xxxxx.xxx
> Subject: [amsat-bb] HAM RADIO UNIVERSITY
>
> HI:
>
> I not available to work the SO-50, 1/10, 15:09 UTC pass for my HRU demo,
> I'm needed as part of a panel discussion. I plan to work the 18:50UTC pass
> of AO-27, thank you.
>
> Trivia: What is the oldest Amateur Satellite in orbit?? I'm preparing for
> my talk and I'm learning..
>
> 73,
> Pete, WB2OQQ
>
> _______________________________________________
> 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
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------------------------------
Message: 16
Date: Sat, 09 Jan 2010 19:40:35 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: HAM RADIO UNIVERSITY
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4B48DBB3.4050709@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Oscar 3 I believe.
OSCAR 3
1 01293U 65016F 10008.72996555 -.00000024 +00000-0 +18252-4 0 07054
2 01293 070.0748 087.1878 0021265 255.8640 104.0104 14.04749543288670
OSCAR 5
1 04321U 70008B 10008.62033938 -.00000031 +00000-0 +10000-3 0 02664
2 04321 102.1211 028.5833 0027679 311.3935 048.4757 12.52158740826472
OSCAR 6
1 06236U 72082B 10009.45774343 -.00000027 00000-0 10000-3 0 2529
2 06236 101.3901 019.4747 0003803 206.8186 153.2693 12.53079924703248
OSCAR 7
1 07530U 74089B 10008.59009504 -.00000027 +00000-0 +10000-3 0 06760
2 07530 101.4114 030.5952 0011875 226.7873 133.2205 12.53577456608454
OSCAR 8
1 10703U 78026B 10008.62600876 +.00000242 +00000-0 +19698-3 0 07136
2 10703 098.8005 050.9786 0006672 329.7175 030.3587 13.98860030624740
On 09-Jan-10 19:21, Greg D. wrote:
>
> Hi Pete,
>
> So, you're probably not intending to have this be a trick question... The
oldest one that's still working is Oscar-7. The oldest one that's still in
orbit is - hmmm, not sure. I know the very first ones, Oscar-1, et al, as
well as many many more modern ones stopped working long ago, but how many of
them have re-entered?
>
> Then there's the Moon (Oscar-zero)...
>
------------------------------
Message: 17
Date: Sat, 09 Jan 2010 11:47:05 -0800
From: Dave Guimont <dguimon1@xxx.xx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: kc6uqh@xxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <38.B5.19578.E3DD84B4@xxxxxxxxxxxxx.xxxx.xx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 11:37 AM 1/9/2010, you wrote:
>Randy,
>True North is used as a reference. Magnetic North changes with observer
>location and time.
>
Art, what does mag north have to do with time??
73, Dave, WB6LLO
dguimon1@xxx.xx.xxx
Disagree: I learn....
Pulling for P3E...
------------------------------
Message: 18
Date: Sat, 9 Jan 2010 13:52:01 -0600
From: Bruce Bostwick <lihan161051@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: amsat-bb@xxxxx.xxx
Message-ID: <29EDCF5F-D7DD-4FE4-BF61-805B37F07D24@xxxxxxxxx.xxx>
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On Jan 9, 2010, at 1:47 PM, Dave Guimont wrote:
> At 11:37 AM 1/9/2010, you wrote:
>> Randy,
>> True North is used as a reference. Magnetic North changes with
>> observer
>> location and time.
>>
>
> Art, what does mag north have to do with time??
Magnetic deviation changes slowly over time as the earth's magnetic
field changes. The rate and current deviation are usually pretty
precisely known for most areas.
"No nation was ever so virtuous as each believes itself, and none was
ever so wicked as each believes the other." -- Bertrand Russell
------------------------------
Message: 19
Date: Sat, 9 Jan 2010 11:53:03 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: probably simple
To: <marklhammond@xxxxx.xxx>, <ptrowe@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BLU133-W299A92CC4CA65BCAE7ED11A96F0@xxx.xxx>
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Hi Mark, Pete, all,
So, please forget my suggestion about TCA as being an easy way to predict
where one should set their dial when setting up for a footprint-stretching
sked. That only works if the satellite is passing directly between the two
stations, at 90-degrees to a line that runs between them. Being on the West
Coast, most DX for me is to the East, and since most of our satellites are
in polar orbits, the model kind of fits. But it's a special case for most
everyone else.
You are absolutely right that the rate of change in Doppler shift is
greatest at TCA, and is proportional to the frequency. When manually tuning
the 2.4 ghz downlink on an overhead AO-51 pass, one needs to continually
spin the dial. It's a physics demonstration at its finest.
Greg KO6TH
> Date: Fri, 8 Jan 2010 13:28:10 -0500
> Subject: Re: [amsat-bb] Re: probably simple
> From: marklhammond@xxxxx.xxx
> To: ptrowe@xxxxx.xxx
> CC: ko6th_greg@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
>
> I think part of the subject that confuses most of us (me included!) is
> that while at TCA the offset is 0, the RATE of change on either side
> of TCA is higher than at AOS or LOS. So, the actual frequency
> offset is BIGGEST at LOS and AOS, but the rate of change is slow (it
> doesnt' change much). It's easier to tune. At TCA you should hear
> the satellite at the "actual" frequency, but not for long because the
> change in frequency is fastest right before and right after...you tune
> like crazy to keep up.
>
> Maybe that will make sense to somebody...but I won't promise :)
>
> Also---don't forget---a 10kHz offset at 2M is 30kHz at 70cm (and one
> is increasing in freq while the other is decreasing...)
>
> Use SatPC32 and you just about forget about having to do anything, and
> watch it happen--good chance to see what is really going on.
>
>
> 73,
>
> Mark N8MH
>
> On Fri, Jan 8, 2010 at 1:11 PM, Pete Rowe <ptrowe@xxxxx.xxx> wrote:
> > Hi Greg
> > I'm confused. It seems to me that the place when Doppler is zero is when
the satellite is about half way through the pass. This is when the Doppler
goes from positive (coming at me) to negative (going away from me). It seems
like this place would be the time of closest approach (TCA) and not way out
on the horizon when I see maximum Doppler.
> > What am I missing?
> >
> > 73,
> > Pete
> > WA6WOA
> >
> > --- On Thu, 1/7/10, Greg D. <ko6th_greg@xxxxxxx.xxx> wrote:
> >
> > From: Greg D. <ko6th_greg@xxxxxxx.xxx>
> > Subject: [amsat-bb] Re: probably simple
> > To: glasbrenner@xxxxxxxxxx.xxx
> > Cc: amsat-bb@xxxxx.xxx
> > Date: Thursday, January 7, 2010, 7:34 PM
> >
> >
> > Hi Drew,
> >
> > SatPC32 is probably an excellent program (I'm on Linux here, so can't
use it), and if you've got the automation available, that's certainly the
best way to go. And, by definition, the lower the elevation, the farther
away the satellite is, so your DX contacts are going to be at the edges of
the pass.
> >
> > But any pass where you are really stretching the footprint is going to
be a low elevation pass. The more you stretch, the lower the pass. In the
limit, I think Bob's ultimate pass has a peak at .001-degrees for both
stations. If you're doing that, then you're at TCA, and zero doppler.
> >
> > That's all I meant to convey,
> >
> > Greg KO6TH
> >
> >
> >> Date: Thu, 7 Jan 2010 05:53:13 -0500
> >> From: glasbrenner@xxxxxxxxxx.xxx
> >> To: ko6th_greg@xxxxxxx.xxx
> >> CC: w7lrd@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
> >> Subject: Re: [amsat-bb] Re: probably simple
> >>
> >> Greg D. wrote:
> >> > Hi Bob,
> >> >
> >> > Whatever the satellite, if you're trying to stretch the footprint,
your sked is always going to be at the peak of elevation, for that fleeting
moment when the satellite is a few degrees above the horizon. That means
that you're always going to be at zero doppler shift, and the math will
always be the same. Find yourself once at TCA on any pass, and lock them
in. The numbers will be the same for your sked.
> >> >
> >> > Good luck,
> >> >
> >> > Greg KO6TH
> >> >
> >> >
> >> I wouldn't agree with that statement at all. Most of my long haul
> >> contacts on AO-7, FO-20 and 29, and now HO-68, are right after AOS or
> >> just before LOS, certainly not at TCA. Use my recent QSOs on HO-68 with
> >> Argentina as an example. Even when I work Europe on AO-7 it is at the
> >> beginning or end of a pass...not the middle.
> >>
> >> Bob, SatPC32 will show you the frequency with Doppler shift, and the
> >> Doppler shift. A little subtraction or addition and you have what you
want.
> >>
> >> 73, Drew KO4MA
> >
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