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CX2SA > SATDIG 19.08.11 20:06l 670 Lines 19141 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: Turn off AGC when receiving BPSK-1000 (aiming your
satellite) (JoAnne Maenpaa)
2. Re: Turn off AGC when receiving BPSK-1000 (i8cvs)
3. Re: Turn off AGC when receiving BPSK-1000 (Gregg Wonderly)
4. Re: Turn off AGC when receiving BPSK-1000 (JoAnne Maenpaa)
5. Re: Frustrated -- not hearing ARRISat (Mike Schaffer)
6. Re: Turn off AGC when receiving BPSK-1000 (Art McBride)
7. CO6CBF QSL Manager (Hector Luis Martinez Sis)
8. EL91/FL01 QSOs now in LotW (Hector Luis Martinez Sis)
9. Re: 5 in EM55 (saguaroastro@xxx.xxxx
10. Re: Kursk files bug in telemetry software? (Mike Rupprecht)
----------------------------------------------------------------------
Message: 1
Date: Fri, 19 Aug 2011 08:31:41 -0500
From: "JoAnne Maenpaa" <k9jkm@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000 (aiming
your satellite)
Message-ID: <000c01cc5e74$5574d880$005e8980$@xxx>
Content-Type: text/plain; charset="UTF-8"
> fact that none of these piggyback payloads have ever come
> to fruition,
Yeah, it brings us back to the original question about "why don't you guys
propose a satellite that hooks on a bigger satellite?" ... we can't say we
haven't tried ... Synchronous Amateur Radio Transponder (SYNCART) was an
AMSAT rideshare was proposed in 1971:
http://www.amsat-dl.org/images/stories/satellites/syncart/sync.pdf
> suggests that we need our own attitude determination
> and control system if at all possible.
This topic came up a couple of times at the 2009 Baltimore Symposium. Tom
Clark, K3IO gave a talk about the physics we need to know about if we put a
motor on our satellite to raise the orbit ourselves. Dan Schultz, N8FGV
presented on electric thrust for small satellites. In both cases attitude
determination and control was needed because we had to point the right
direction before turning on the thrust. The bonus would be we would know
where antenna(s) were pointing.
> It wouldn't be terribly hard to network the ground stations
> so that a conversation could be maintained as the ISS moves
> from one to the next.
It could be like a handover during a cellular call? I proposed the ground
stations could be tied together with a GEO-Eagle class bird, while the ISS
was the "mobile":
http://home.comcast.net/~k9jkm/Education_AMSAT_Eagle.pdf
Lacking an Eagle we could substitute less glamorous but nicely functional
terrestrial networks ;-)
> To simplify the implementation, provide good voice quality
> and a backup data capability, the system would have to be
> completely digital.
Tim, AB0DO wrote a paper on this very topic:
http://www.saloits.com/papers/AMSAT2008.pdf
Heck, with all these papers written about it ... now we just gotta build one!
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
------------------------------
Message: 2
Date: Fri, 19 Aug 2011 15:34:48 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Phil Karn" <karn@xxxxxxxx.xxx>, "Bob Bruninga"
<bruninga@xxxx.xxx>, "Dave Guimont" <dguimon1@xxx.xx.xxx>
Cc: Amsat - BBs <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
Message-ID: <000001cc5e75$05b16c40$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Dave, Phil and Bob,
For additional information read
http://www.w2du.com/r2ch22.pdf
and look at Fig 22-7 page 10 of 20 Radiation Pattern of the 1 1/2
turn 1,25 wavelenght Quadrifilar Antennas.
With the antenna straight up pointed to Zenith the gain is 4 dBi all
around the azimuth at 30? elevation and -3 dBi overhead at 90?
elevation.
73" de
i8CVS Domenico
----- Original Message -----
From: "Dave Guimont" <dguimon1@xxx.xx.xxx>
To: "Phil Karn" <karn@xxxxxxxx.xxx>; "Bob Bruninga" <bruninga@xxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Sent: Friday, August 19, 2011 7:31 AM
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
>
> >
> >You don't have to use a narrow beam antenna with maximum gain on axis.
> >You can always design it with a bowl-shaped pattern that increases gain
> >toward the edges and lowers it in the middle.
>
> That's why the quadrifilars work so well. I measured the pattern some
> time back, and the "beam width" is about 140 degrees....
>
> Point them straight up and be satisfied with that part of a pass, or
> mount them at 40 degrees, and rotate AZ with a TV rotor for the
> entire pass. For 50 degree max passes point them at the center of the
pass...
>
>
>
>
> 73, Dave, WB6LLO
> dguimon1@xxx.xx.xxx
>
> Disagree: I learn....
>
> Pulling for P3E...
> _______________________________________________
> 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: 3
Date: Fri, 19 Aug 2011 09:51:58 -0500
From: Gregg Wonderly <w5ggw@xxx.xxx>
To: Phil Karn <karn@xxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
Message-ID: <4E4E788E.9080208@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 8/18/2011 10:38 PM, Phil Karn wrote:
> On 8/18/11 11:03 AM, JoAnne Maenpaa wrote:
>
>> Yeah, we still have dreams! At various times it had been called
AMSAT-Eagle,
>> Phase IV Lite, C-C Rider, and other things. You'll notice from the dates on
>> these papers how long we've had this dream of a millions dollar rideshare
>> with a millions dollar satellite ...
>
> Yes, and the fact that none of these piggyback payloads have ever come
> to fruition, while we do continue to get the occasional ad-hoc small
> satellite deployment opportunity, suggests that we need our own attitude
> determination and control system if at all possible.
>
> The most likely opportunity to piggyback a payload on a controlled
> platform with its own power supply would be the ISS itself. Although
> they've already got plenty of comm systems, one might pitch this as yet
> another backup comm system. It wouldn't be terribly hard to network the
> ground stations so that a conversation could be maintained as the ISS
> moves from one to the next. To simplify the implementation, provide good
> voice quality and a backup data capability, the system would have to be
> completely digital.
What kind of digital are you suggesting? Voice and data both? A digital path
from anywhere on the planet to the appropriate ground station is easily doable
with some "documentation" of the ground stations.
Gregg Wonderly
------------------------------
Message: 4
Date: Fri, 19 Aug 2011 11:44:51 -0500
From: "JoAnne Maenpaa" <k9jkm@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
Message-ID: <001a01cc5e8f$51300ea0$f3902be0$@xxx>
Content-Type: text/plain; charset="us-ascii"
> What kind of digital are you suggesting? Voice and data both?
The Eagle project at one point proposed an AMSAT Advanced Communications
Package (ACP) microwave, digital-uplink (5650 MHz) and digital downlink
(3400 MHz).
Realizing that microwave earth station design is beyond the scope of most
hams the Eagle team proposed making an ACP-capable earth station within
reach of most radio amateurs that was thought it could be distributed along
the lines of the project kits offered by the Tucson Amateur Packet Radio
group (TAPR).
Radio link budgets and on-air protocols were being studied so the average
earth station could have used 24 inch diameter dishes similar to home
satellite television. Well, that was a goal anyways.
This Advanced Communications Package has been called 'Project Namaste' and
'Microwave Engineering Project' over the years. There was a proposal that a
portion of the transponder would be reserved for analog operations so there
was some chance the gear you already had would be useful, perhaps with
Transverter or receive converter. You would need the ACP package to take
advantage of all the advanced features of the network.
The Doppler shift at microwave frequencies would be manageable on HEO or
GEO. It would be quite a challenge on something moving across your range
like the ISS does.
> A digital path from anywhere on the planet to the appropriate
> ground station is easily doable with some "documentation" of
> the ground stations.
This was what was proposed back in 2008 at the Atlanta Symposium:
http://www.saloits.com/papers/AMSAT2008.pdf
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
------------------------------
Message: 5
Date: Fri, 19 Aug 2011 10:10:54 -0700 (PDT)
From: Mike Schaffer <daetsort@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Frustrated -- not hearing ARRISat
Message-ID:
<1313773854.12864.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Burns:
?
Make sure your receive mode for frequency 145.950 is FM on your
Kenwood F6A handheld.
?
Before you?upgraded with additional hardware could you receive
ARISSat-1 signals using the stock antenna inside your shack?
?
If you can, the next step is to?remove the Diamond 2m/70cm
duplexer as it might be blocking the amplified signal from your SSB?
2m pre-amp.
?
If that does not?help, then?it could be that?the satellite signal are being
degraded more than 75 percent or blocked entirely by the orient strand
board (OSB) radiant barrier roof sheathing which is backed with a
specially designed aluminum foil. The same goes if your dwelling
exterior is fabricated with aluminum siding.
?
It that is the case, then your only hope is to mount the antenna outside.
?
?
73's
?
Mike Schaffer
KA3JAW
Tampa, Florida
EL87
------------------------------
Message: 6
Date: Fri, 19 Aug 2011 10:12:55 -0700
From: "Art McBride" <kc6uqh@xxx.xxx>
To: "'Phil Karn'" <karn@xxxxxxxx.xxx>, "'Dave Guimont'"
<dguimon1@xxx.xx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
Message-ID: <C265730D633F42818784AA1FCE086ABE@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Phil,
If you have access to the December 1970 issue of the Microwave Journal there
is data on a 1 wavelength, 1 turn Quadrifilar Helix with a beam width of
greater than 180 degrees. Only the 1/2 turn 1/2 wave is popular today, the
140 degree beam with offers the best front to back ratio @ 0.3 axial
wavelengths.
Art,
KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Phil Karn
Sent: Thursday, August 18, 2011 10:44 PM
To: Dave Guimont
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000
On 8/18/11 10:31 PM, Dave Guimont wrote:
> That's why the quadrifilars work so well. I measured the pattern some
> time back, and the "beam width" is about 140 degrees....
Yes, something with that kind of beamwidth would be ideal on the
nadir-facing surface of a stabilized satellite in low earth orbit. It
would be even better if the gain in the straight-down direction could be
reduced in favor of gain at the edges. Ideally you'd have a constant
power density over the entire visible earth.
You could of course use a much more directional antenna on the ground if
it can track the satellite.
--Phil
_______________________________________________
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 6391 (20110819) __________
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------------------------------
Message: 7
Date: Fri, 19 Aug 2011 13:35:40 -0400 (EDT)
From: "Hector Luis Martinez Sis" <hmartinez@xxx.xxx.xx>
To: amsat-bb@xxxxx.xxx
Cc: co6cbf@xxxxx.xxx
Subject: [amsat-bb] CO6CBF QSL Manager
Message-ID: <1359.10.14.32.18.1313775340.squirrel@xxxxxx.xxx.xxx.xx>
Content-Type: text/plain; charset="utf-8"
Hello friends
?
As you know, I have been some troubles sending and
receiving the QSL cards to/from USA. I have lost a lot of QSL cards in the
mail.
?
To solve this problem; Now, WA5KBH, George will be
my QSL manager for the USA stations.
?
If you sent your solicited QSL card via direct
some time ago and I reported that I haven’t received it; please, send
it again via
WA5KBH.
?
Also, if you need my QSL card; you can request it
at George, WA5KBH. Please, include SASE with the card request.
?
Here, are the QSL cards that I have received via
direct. I have sent all the cards solicited, some via direct and others via
John, K8YSE.
Please, if you haven’t received my QSL card, let me know and I will
resend it
until you receive it.
K8YSE
CO8TW N5ZNL
N2BX NO8DX/20
NZ5N K4MOA
WB2SIH N8RO
K4MF AA5PK
NX9G WA5KBH
XE1BEP W3KXR
KC0BMF N1BSA
N4ERZ YS1MS
K3SV K7TEJ
AA5JG N2BX
KB1RVT
?
KF7MYK
N8MH WB8TGY
AA4FL WA4HFN
KB1PVH WO3T
W0EZ WB3CSY
KB1RVT KC0ZHF?
K5OE W5LL
AJ5C WC7V
WD9EWK KC0YBM/P
KQ4KK AA5CK
VE3JW K0H
KB2CDY N0JY?
HK4MKE WC7V KF7MYK/P WD8PFS
?
?
Thanks for your help!
?
?
73!
?
Hector, CO6CBF
?
EL92
?
?
?
***************************************
Genius is one per cent
inspiration,
and ninety-nine per cent
perspiration.
-- Thomas A.
Edison
***************************************
---
Free the Cuban Five!
http://www.injusticia.cubaweb.cu/, http://www.antiterroristas.cu/
Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana, Cuba.
http://www.congresouniversidad.cu/
Consulte la Enciclopedia Colaborativa Cubana: http://www.ecured.cu/
------------------------------
Message: 8
Date: Fri, 19 Aug 2011 13:49:05 -0400 (EDT)
From: "Hector Luis Martinez Sis" <hmartinez@xxx.xxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] EL91/FL01 QSOs now in LotW
Message-ID: <1380.10.14.32.18.1313776145.squirrel@xxxxxx.xxx.xxx.xx>
Content-Type: text/plain; charset="utf-8"
Hello Hams
?
I just updated to
LotW the log of my portable operation in the line grid EL91/FL01. Please,
update the
contacts using only my call CO6CBF without /P.
?
If you have any
trouble with the matches; please, let me know.
?
73!
?
Hector, CO6CBF
?
EL92
?
***************************************
Genius is one per cent
inspiration,
and ninety-nine per cent
perspiration.
-- Thomas A.
Edison
***************************************
---
Free the Cuban Five!
http://www.injusticia.cubaweb.cu/, http://www.antiterroristas.cu/
Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana, Cuba.
http://www.congresouniversidad.cu/
Consulte la Enciclopedia Colaborativa Cubana: http://www.ecured.cu/
------------------------------
Message: 9
Date: Fri, 19 Aug 2011 14:13:45 -0400
From: <saguaroastro@xxx.xxx>
To: "Jim Cameron \"KC9PXZ\"" <kc9pxz@xxxxx.xxx>, "'AMSAT BB'"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 5 in EM55
Message-ID: <20110819141345.LT8TL.1613897.imail@xxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Jim,
The Details are on Damon's (WA4HFN) QRZ page.
73
Rick
K7TEJ
---- "Jim Cameron "KC9PXZ"" <kc9pxz@xxxxx.xxx> wrote:
> congrats, what is this award and were can i find the info on it?
> Tx
> 73
> KC9PXZ
> Jimmy
> ----- Original Message -----
> From: <wa4hfn@xxxxxxx.xxx>amsat-bb@xxxxx.xxx>
> Sent: Thursday, August 18, 2011 7:48 PM
> Subject: [amsat-bb] 5 in EM55
> To: "AMSAT" <
>
> > Congrats to Clayton for 5 in em55 award #24
> > WA4HFN em55 Damon
> > _______________________________________________
> > 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
------------------------------
Message: 10
Date: Fri, 19 Aug 2011 20:41:06 +0200
From: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>
To: "'Roland Zurmely'" <py4zbz@xxxxx.xxx>, "'AMSAT'"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Kursk files bug in telemetry software?
Message-ID: <01aa01cc5e9f$8e40bc80$aac23580$@xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Roland,
there are several strange things with the KURSK files.
The first one is ARISSatTLM itself - a complete exp file should have a
length of 2048 bytes (piece file 1..4 = 504 bytes and piece file 5 = 32
byte)
An .exp file generated by ARISSatTLM is 1797 bytes - so the software
incorrectly joins the files together. But this is a known bug.
The last "valid" KURSK file was sent on Aug 13 and was created by ARISSat at
22:32:42 ( don't know the timezone but let's say UTC)
Since this date we receive always a KURKS file with this 944 MET timestamp.
If you look into this telemetry file you can see an internal timestamp
(created at BCD) with Nov 16, 12:47:09 UTC !
If you have a KURSK file with MET = 944 in your directory you will see no
new incoming data.
This is why your workaround with the new directory works. I assume all your
new created directory contain this 944.x files.
So it seems, we will receive no new KURSK telemetry data from the satellite.
I don't know if there is a possibility to reset the experiment by a command
from a control station.
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
Auftrag von Roland Zurmely
Gesendet: Donnerstag, 18. August 2011 19:25
An: AMSAT
Betreff: [amsat-bb] Kursk files bug in telemetry software?
It seems that there is a bug in telemetry software,
perhaps created by the MET reset on each orbit?
Each day, recorded files always have the same names:
KURSK-944.1? KURSK-944.2 and so on...
So I did the following:
Every day end, I'm renaming the folder Kursk as kursk1, kursk2,...
So I have a folder per day. Next day,
when the software is launched, it creates automaticaly
a new Kursk folder, that will contains the files from this day,
with the same names of past days, but in a new folder.
73 de Roland.
_______________________________________________
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 6, Issue 478
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