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CX2SA > SATDIG 09.08.11 13:49l 878 Lines 29066 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. SP-2000 Preamp? (Burns Fisher)
2. Re: SP-2000 Preamp? (Dave Webb KB1PVH)
3. Re: SP-2000 Preamp? (Gould Smith)
4. Re: SP-2000 Preamp? (Stephen E. Belter)
5. ARISSat-1: switching modes ? (PA3GUO)
6. Re: receive beacon in l band and s-band (Roger)
7. SSB Preamp Dealers in Japan (Sion Chow Q. C. (9W2QC))
8. Arissat-1 today (PY5LF)
9. Diffference between high and low power modes on ARRISat-1
(Mike Ryan)
10. First SSTV transmission via the ARISSat-1 transponder ! (PA3GUO)
11. Re: SP-2000 Preamp? (Jari Koivurinne)
12. Re: ARISSat-1 OSCAR Number? (Robert McGwier)
13. Re: ARISSat TLM decoding using FCD (Phil Karn)
14. Re: ARISSat deployment direction? (Phil Karn)
15. Re: iss beacon receive and vhf preamp (N. Mahdinejad)
16. A couple of interesting links (g.shirville@xxxxxxxxxx.xxxx
17. Re: ARISSat-1: switching modes ? (Alan P. Biddle)
18. Re: Diffference between high and low power modes on ARRISat-1
(Dave Taylor)
----------------------------------------------------------------------
Message: 1
Date: Mon, 8 Aug 2011 20:47:14 -0400
From: Burns Fisher <burns@xxxxxx.xx>
Subject: [amsat-bb] SP-2000 Preamp?
To: amsat-bb@xxxxx.xxx
Message-ID:
<CABX7KxVbADQcvafbJz3pfG6Qpg_xBD1dkzfRJMKUubE1j2r=yw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi,
I've been listening on a couple of ARISSat-1 passes, both with the bird in
sunlight. The first time I vaguely heard what might have been a voice. The
second time (and this one was 80 or 85 degrees elevation) I could clearly
hear that there was a voice, but could not understand, although some of the
pattern sounded like the call sign being announced. I may have heard a bit
of SSTV too; not sure. I'm listening with a Kenwood handheld, sometimes
with a 1/4 after-market antenna, sometimes with a 2M eggbeater.
So clearly I need something better. Since I can pick up the ISS well
enough, I think I probably need a preamp. Maybe if I were retired and had
more time, I'd build one, but for now, I'm thinking to go for the top-end;
that appears to be an SSB Electronics SP-2000. But so far, no answer nor
return call on my message to SSB. Does anyone know of a different place to
buy these things, or do they only feel through their rep? How about second
hand? Anyone looking to sell one?
Of course any other suggestions welcome too...
Thanks and 73,
Burns, W2BFJ
------------------------------
Message: 2
Date: Mon, 8 Aug 2011 21:11:00 -0400
From: Dave Webb KB1PVH <kb1pvh@xxxxx.xxx>
Subject: [amsat-bb] Re: SP-2000 Preamp?
To: Burns Fisher <burns@xxxxxx.xx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<CAEMY9Fdr5i+cBNnGrF-JkCQw-pD77km+e7qV6tfXmV5Fv4ouhA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
These guys are great to deal with.
http://www.advancedreceiver.com/
Dave - KB1PVH
Sent from my Verizon Wireless DROID X
On Aug 8, 2011 9:07 PM, "Burns Fisher" <burns@xxxxxx.xx> wrote:
> Hi,
>
> I've been listening on a couple of ARISSat-1 passes, both with the bird in
> sunlight. The first time I vaguely heard what might have been a voice. The
> second time (and this one was 80 or 85 degrees elevation) I could clearly
> hear that there was a voice, but could not understand, although some of
the
> pattern sounded like the call sign being announced. I may have heard a bit
> of SSTV too; not sure. I'm listening with a Kenwood handheld, sometimes
> with a 1/4 after-market antenna, sometimes with a 2M eggbeater.
>
> So clearly I need something better. Since I can pick up the ISS well
> enough, I think I probably need a preamp. Maybe if I were retired and had
> more time, I'd build one, but for now, I'm thinking to go for the top-end;
> that appears to be an SSB Electronics SP-2000. But so far, no answer nor
> return call on my message to SSB. Does anyone know of a different place to
> buy these things, or do they only feel through their rep? How about second
> hand? Anyone looking to sell one?
>
> Of course any other suggestions welcome too...
>
> Thanks and 73,
>
> Burns, W2BFJ
> _______________________________________________
> 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: Mon, 8 Aug 2011 21:15:14 -0400
From: "Gould Smith" <gouldsmi@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: SP-2000 Preamp?
To: "Burns Fisher" <burns@xxxxxx.xx>, <amsat-bb@xxxxx.xxx>
Message-ID: <ADB641AB78264D5AB6DE2C88573A4171@xxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hello Burns,
You should try a handheld antenna like an Elk or Arrow antenna with your
handheld. These are basically handheld antennas, but will greatly improve
both your uplink and downlink.
73,
Gould, WA4SXM
----- Original Message -----
From: "Burns Fisher" <burns@xxxxxx.xx>
To: <amsat-bb@xxxxx.xxx>
Sent: Monday, August 08, 2011 8:47 PM
Subject: [amsat-bb] SP-2000 Preamp?
> Hi,
>
> I've been listening on a couple of ARISSat-1 passes, both with the bird in
> sunlight. The first time I vaguely heard what might have been a voice.
> The
> second time (and this one was 80 or 85 degrees elevation) I could clearly
> hear that there was a voice, but could not understand, although some of
> the
> pattern sounded like the call sign being announced. I may have heard a
> bit
> of SSTV too; not sure. I'm listening with a Kenwood handheld, sometimes
> with a 1/4 after-market antenna, sometimes with a 2M eggbeater.
>
> So clearly I need something better. Since I can pick up the ISS well
> enough, I think I probably need a preamp. Maybe if I were retired and had
> more time, I'd build one, but for now, I'm thinking to go for the top-end;
> that appears to be an SSB Electronics SP-2000. But so far, no answer nor
> return call on my message to SSB. Does anyone know of a different place
> to
> buy these things, or do they only feel through their rep? How about
> second
> hand? Anyone looking to sell one?
>
> Of course any other suggestions welcome too...
>
> Thanks and 73,
>
> Burns, W2BFJ
> _______________________________________________
> 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, 8 Aug 2011 21:38:45 -0400
From: "Stephen E. Belter" <seb@xxxxxx.xxx>
Subject: [amsat-bb] Re: SP-2000 Preamp?
To: "'Amsat BB'" <amsat-bb@xxxxx.xxx>
Message-ID:
<51668A33220E754EABE6583357ECEE2D79CD56CF@xxxxxxxx.xxxxxx.xxxxx>
Content-Type: text/plain; charset="us-ascii"
Burns,
I own SSB preamps; they have worked very well for me, both on my Icom IC-821
(powered by the radio) and with my FUNcube Dongle (powered with an external
bias-T from ARR).
You have at least four sources for the SSB preamp:
1. Direct from SSB in Germany, www.ssb.de
2. From SSB-Electronics USA, www.ssbusa.com
3. From Array Solutions, www.arraysolutions.com
4. From Universal Radio, www.universal-radio.com
73, Steve N9IP
--
-----Original Message-----
Hi,
I've been listening on a couple of ARISSat-1 passes, both with the bird in
sunlight. The first time I vaguely heard what might have been a voice. The
second time (and this one was 80 or 85 degrees elevation) I could clearly
hear that there was a voice, but could not understand, although some of the
pattern sounded like the call sign being announced. I may have heard a bit
of SSTV too; not sure. I'm listening with a Kenwood handheld, sometimes
with a 1/4 after-market antenna, sometimes with a 2M eggbeater.
So clearly I need something better. Since I can pick up the ISS well
enough, I think I probably need a preamp. Maybe if I were retired and had
more time, I'd build one, but for now, I'm thinking to go for the top-end;
that appears to be an SSB Electronics SP-2000. But so far, no answer nor
return call on my message to SSB. Does anyone know of a different place to
buy these things, or do they only feel through their rep? How about second
hand? Anyone looking to sell one?
Of course any other suggestions welcome too...
Thanks and 73,
Burns, W2BFJ
_______________________________________________
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: 5
Date: Tue, 9 Aug 2011 03:47:32 +0200
From: "PA3GUO" <pa3guo@xxxxx.xxx>
Subject: [amsat-bb] ARISSat-1: switching modes ?
To: <amsat-bb@xxxxx.xxx>
Message-ID: <001e01cc5636$4f313770$ed93a650$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Can someone point me to the ARISSat-1 mode schedules ?
During the recent pass, ARISSat was the first pass in low pwr mode.
During the (short) active periods I could relay short CW beeps over the
transponder @xx.
Midway the pass the satellite came in the sun and switched on and stayed on.
But now the transponder was off.
Is there an overview of sequence of modes, eg when SSTV is on Xponder off,
etc. ?
Henk, PA3GUO,
------------------------------
Message: 6
Date: Mon, 08 Aug 2011 22:21:30 -0400
From: Roger <Rogerkola@xxx.xxx>
Subject: [amsat-bb] Re: receive beacon in l band and s-band
To: amsat-bb@xxxxx.xxx
Message-ID: <4E4099AA.3060605@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Henk...
At the risk of starting a long debate...I don't think think that
information is necessary to answer his question. I don't believe
callsigns are required to be a member of the list and unless there are
amateur satellites that only operate in L & S band over certain parts of
the globe, his location isn't of much importance in answering his inquiry.
Roger
WA1KAT
On 8/8/2011 1:38 PM, PA3GUO wrote:
> Dear N.Mahdinejad,
>
> What is your callsign and location/country ?
>
> Henk, PA3GUO
>
>
>> Dear Amsat members.
> .
> I am lloking forward to hearing from you.
> Best Regards.
> N.Mahdinejad.
>
------------------------------
Message: 7
Date: Mon, 08 Aug 2011 22:27:46 -0400
From: "Sion Chow Q. C. (9W2QC)" <9w2qc@xxxxx.xxx>
Subject: [amsat-bb] SSB Preamp Dealers in Japan
To: amsat-bb@xxxxx.xxx
Message-ID: <20110808222746.16826ctriqigmkw8@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes";
format="flowed"
Dear All,
Sorry for the bandwidth again. I would be glad if anyone could advice
me if there are any dealers or distributors dealing with SSB
Electronic Preamps in Japan.
Any pointers will be greatly appreciated, and kindly reply me off the list.
Thank you.
73, Sion, 9M2CQC
------------------------------
Message: 8
Date: Mon, 8 Aug 2011 23:44:10 -0300
From: "PY5LF" <py5lf@xxxxxxxxxxxxx.xxx.xx>
Subject: [amsat-bb] Arissat-1 today
To: <AMSAT-BB@xxxxx.xxx>
Message-ID: <002601cc563e$37db9400$a792bc00$@xxx.xx>
Content-Type: text/plain; charset="us-ascii"
Hi
My QSO with PY4ZBZ today via TPL in better conditions (less noise).
Also we can see the moment when the TPL turn off after 40 seconds without
sun light , I think.
http://www.youtube.com/watch?v=oJ2Gujm2vtc
73
PY5LF
LUCIANO FABRICIO
Curitiba-PR-Brazil GG54jm
<http://www.qrz.com/db/py5lf> http://www.qrz.com/db/py5lf
------------------------------
Message: 9
Date: Mon, 8 Aug 2011 23:09:29 -0400
From: "Mike Ryan" <mryan301@xxxxxxx.xxx>
Subject: [amsat-bb] Diffference between high and low power modes on
ARRISat-1
To: <amsat-bb@xxxxx.xxx>
Message-ID: <E6EDA56F35C145F0B5D3CBC27F0242F7@xxxxxxxxx>
Content-Type: text/plain; charset="utf-8"
Whats the difference between high and low power mode? I know its determined
by being in eclipse or not and I believe high power is 0.5 W on SSB and FM.
But no luck in finding more info than that on the web about power.
So far, all passes I?ve been able to copy here Eastern US are late at night
(11PM-1AM) so I?m assuming I?m getting low power mode.
Mike WB1AAT
------------------------------
Message: 10
Date: Tue, 9 Aug 2011 6:01:20 +0200
From: PA3GUO <pa3guo@xxxxxxx.xx>
Subject: [amsat-bb] First SSTV transmission via the ARISSat-1
transponder !
To: amsat-bb@xxxxx.xxx
Cc: pa3guo@xxxxx.xxx
Message-ID: <20110809060120.TA63W.33930.root@xxxxxxxx.xxxxxx.xx>
Content-Type: text/plain; charset=utf-8
Today morning at 02:58utc I succesfully did a short SSTV test using the
linear transponder of ARISSat-1:
http://www.pa3guo.com/pa3guo_arissat1_sstv_9aug2011_0258utc.jpg
Prior to this I did some experiments with CW, starting at 50W, going down to
5W.
My TS2000 does not go lower as 5W, but I believe even 1W or lower will be
audible.
In my opinion the transponder uplink is VERY sensitive.
Using the FunCubeController SDR is it nice to see the full downlink
spectrum, on the left the
CW+BPSK signals, the transponder downlink in the middle, and the FM downlink
on the right.
Equipment:
Uplink HW: TS2000X, 435MHz, 5W RF power + 12 elements beam
Uplink SW: MMSSTV + HRD (doppler control)
Downlink HW: FunCubeDongle (SDR) + SP-2000 preamp + 2x6 elements beam
Downlink SW: MMSSTV + DK3WN Satcontrol (doppler/freq control) + HDSDR (SDR)
--
Henk, PA3GUO,
The Netherlands
------------------------------
Message: 11
Date: Tue, 9 Aug 2011 09:08:11 +0300
From: "Jari Koivurinne" <jari.koivurinne@xxxx.xxx>
Subject: [amsat-bb] Re: SP-2000 Preamp?
To: "Burns Fisher" <burns@xxxxxx.xx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<496dba56c1ba84942035f4147e4b9585.squirrel@xxxxxxx.xxxx.xxx>
Content-Type: text/plain;charset=iso-8859-1
> Hi,
>
> I've been listening on a couple of ARISSat-1 passes, both with the bird in
> sunlight. The first time I vaguely heard what might have been a voice. The
> second time (and this one was 80 or 85 degrees elevation) I could clearly
> hear that there was a voice, but could not understand, although some of the
> pattern sounded like the call sign being announced. I may have heard a bit
> of SSTV too; not sure. I'm listening with a Kenwood handheld, sometimes
> with a 1/4 after-market antenna, sometimes with a 2M eggbeater.
>
> So clearly I need something better. Since I can pick up the ISS well
> enough, I think I probably need a preamp. Maybe if I were retired and had
> more time, I'd build one, but for now, I'm thinking to go for the top-end;
> that appears to be an SSB Electronics SP-2000. But so far, no answer nor
> return call on my message to SSB. Does anyone know of a different place to
> buy these things, or do they only feel through their rep? How about second
> hand? Anyone looking to sell one?
>
> Of course any other suggestions welcome too...
>
> Thanks and 73,
>
> Burns, W2BFJ
> _______________________________________________
Here:
http://www.wimo.de/framesetp_e.html
-jari oh3uw
------------------------------
Message: 12
Date: Mon, 8 Aug 2011 16:38:40 -0400
From: Robert McGwier <rwmcgwier@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat-1 OSCAR Number?
To: "Nigel A. Gunn, W8IFF/G8IFF" <nigel@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<CA+K5gze1XBesV9qpn8Tj8M59F1W1rm5Fw3Lo=togyQur0QhP1Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
An Oscar number has several specific requirements which must be met,
including but not limited to, coordination PRIOR to flight.
That didn't happen so far as I know.
Bob
N4Hy
On Mon, Aug 8, 2011 at 4:17 PM, Nigel A. Gunn, W8IFF/G8IFF
<nigel@xxxxx.xxx>wrote:
> Depends whether you can define "the owners".
>
>
> On 08/08/2011 08:08 PM, Trevor . wrote:
> > Is it known if the owners of ARISSat-1 intend to apply for an OSCAR
> number?
> >
> > 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
> >
>
> _______________________________________________
> 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
>
--
Bob McGwier
ARS: N4HY
------------------------------
Message: 13
Date: Tue, 09 Aug 2011 01:01:21 -0700
From: Phil Karn <karn@xxxxxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat TLM decoding using FCD
To: g0mrf@xxx.xxx
Cc: amsat-bb@xxxxx.xxxx pa3guo@xxxxx.xxx
Message-ID: <4E40E951.60204@xxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
On 8/8/11 5:23 AM, g0mrf@xxx.xxx wrote:
> I've been tracking doppler by hand. Seems to work OK but it's very
> important to keep the CW in the 'blue' window. I would think jumps
> would not be good. Perhaps frequent doppler updates. - So very small
> jumps.
Jumps per se are not a problem. I.e., if you're off frequency, the
sooner you correct it the better; there's no need to tune back
gradually. The error correcting code I'm using is pretty strong but it
does have its limits, and being significantly off frequency can take out
a lot of the information it needs to function.
ARISSat-1 is transmitting FEC coded DBPSK - differential binary phase
shift keying. A '0' is sent as a 180 degree phase reversal of the
carrier and a '1' is sent as no reversal. Because the data being coded
and sent is actually coming from a HDLC encoder that stuffs 0's when
necessary, there should be plenty of 0's in the transmitted data stream.
That's important for clock recovery at the receiver.
Differential encoding permits a very simple and robust method of
demodulation. There's no need for a phase lock loop to track the carrier
as in the Phase III 400 bps modems; that would be essentially hopeless
on a signal that fades as quickly as this one does.
I first convert the signal to complex baseband, i.e., I & Q signals with
the carrier nominally at zero Hz. If you were to plot these I&Q values
on an X/Y scope, and if your tuning were perfect, you'd see a vector
(the signal carrier) at some random phase angle flipping randomly back
and forth 180 degrees, e.g., between 37 deg and 217 deg.
Because the data is encoded in the *change* of that phase, there's no
need to know the absolute phase. To decode the DBPSK data you simply
take the dot product of consecutive pairs of I & Q samples. You multiply
the two I values, multiply the two Q values, and add them. If there's
been no phase change, i.e., a 1 was sent, then the dot product will be
positive no matter what the absolute phase angle. If the phase did flip,
then the dot product will be negative, again no matter what the phase angle.
I actually use the magnitudes of the dot products for something called
"soft decision decoding" in the error correction algorithm (a Viterbi
decoder) but that's a refinement. The basic idea is to simply look for a
change or no change in carrier phase from one bit to the next without
caring about the absolute phase.
Now what happens if you're mistuned? Well, the carrier vector no longer
remains stationary on the X/Y scope; it begins to rotate at the rate of
your tuning error. If you're tuned 10 Hz high, i.e., the carrier is
coming out 10 Hz low, then the carrier vector will rotate clockwise 10
times per second. If you're tuned 10 Hz low, then the vector rotates
counterclockwise 10 times per second. (Mathematically, counterclockwise
rotation is positive and clockwise is negative.)
This can obviously wreak havoc with demodulation if you're too far off
frequency. But because the comparisons are done between adjacent bits
you only have to worry about how much it rotates in one bit time, which
at 1000 Hz is 1 millisecond. If you're 10 Hz off, then the vector will
rotate 10/1000 = 1/100 of a revolution or 3.6 degrees; not much. Taking
the dot product of two vectors 3.6 degrees apart gives almost the same
answer as two vectors 0 deg apart. Same for vectors 183.6 deg apart
instead of 180 deg.
So being off by 10 Hz isn't much of a problem. If your radio tunes in 10
Hz steps, and you can accurately compute Doppler, then don't hesitate to
do lots of 10 Hz tuning steps to stay on frequency. (This assumes that
your radio tunes smoothly, which all modern radios seem to do.)
But as you get farther off frequency things begin to degrade, slowly at
first, then quickly. If you're 100 Hz off, that's 1/10 of a revolution
or 36 degrees. The cosine of 36 degrees is about .81, so you lose about
1.84 dB of performance (.81 is an amplitude ratio so you have to use the
dB voltage formula, 20 log10(0.81)). At 200 Hz, you're off 72 deg and
you've lost a full 10.2 dB!
Fortunately, my decoder does a search around the nominal frequency so
you can actually be offtuned this much and the demodulator will still
work. But I only search a +/- 200 Hz window in 100 Hz steps because
beyond that the signal will start to get chopped off by the edges of the
SSB filter in your radio. (And Doug was complaining that my demodulator
wouldn't run in real time on his old, slow Pentium III!)
Frequency tracking is clearly the biggest weakness in my whole scheme,
and it argues very strongly for wideband SDR-like radios instead of SSB
receivers with narrow filters. A receiver wide enough to capture not
only the signal but the entire Doppler range of +/- 3.3 kHz for 2m could
eliminate all tuning during the pass because the computer could do it
all in software.
-phil
------------------------------
Message: 14
Date: Tue, 09 Aug 2011 01:18:02 -0700
From: Phil Karn <karn@xxxx.xxx>
Subject: [amsat-bb] Re: ARISSat deployment direction?
To: APBIDDLE@xxxxxxx.xxx
Cc: 'Rich Dailey' <richdailey@xxxxxxxxxx.xxx>, amsat-bb@xxxxx.xxxx
"Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Message-ID: <4E40ED3A.2030805@xxxx.xxx>
Content-Type: text/plain; charset=UTF-8
On 8/8/11 6:09 AM, Alan P. Biddle wrote:
> Rich,
>
> Orbital dynamics are not all that intuitive.
That's absolutely right. Some historical trivia: even NASA tripped over
this in the early days. When the Gemini IV crew tried to rendezvous with
their spent booster, they kept missing. They were trying to fly the
capsule as if it were an airplane, or maybe a boat floating on the water
(only in 3D) but things just didn't work that way. Everything seemed to
work in reverse, like that old Star Trek episode with the giant space
amoeba.
------------------------------
Message: 15
Date: Tue, 9 Aug 2011 13:20:19 +0430
From: "N. Mahdinejad" <n.mahdinejad@xxxxx.xxx>
Subject: [amsat-bb] Re: iss beacon receive and vhf preamp
To: nh6vb Scheller <nh6vb@xxx.xxx>, Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<CAH27MAMvNpQnVanxwajckaattSQLxTW43KXGO2mLTKr+L1DGFw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
Hi.
I am Mrs Nayer from polytechnic(Amir Kabir) university in tehran IRAN,
Telecommunication engineering student in MA degree and dont have callsign.
Best Regards.
On Tue, Aug 9, 2011 at 1:18 AM, nh6vb Scheller <nh6vb@xxx.xxx> wrote:
> Mr. Mahdinejad
>
> There should be no problem receiving receiving FM signals from the ISS.
> What ICOM receiver are you using, and what is your QTH?
> After receiving that information from you, I will give you the instructions
> you need.
>
> 73,
> Peter, NH6VB
>
> > Date: Mon, 8 Aug 2011 17:01:27 +0430
> > From: n.mahdinejad@xxxxx.xxx
> > To: amsat-bb@xxxxx.xxx
> > Subject: [amsat-bb] iss beacon receive and vhf preamp
>
> >
> > Dear amsat members.
> >
> > I have some question about receiving beacon signal from ISS.
> >
> > Could you please help me?
> >
> > 1. What is the difference between ISS, ARISS and ZARYA? Is these
>
> > different satellites or 1 satellite with 3 name?
> > 2. Which of them is easier to receive beacon from them?
> > 3. Frequency of beacon signal of ISS is in VHF band. Is it available
>
> > without preamp? I use 2 preamp. One for VHF and 1 for UHF band. But the
> > preamp in vhf band isn?t on. I mean that icom receiver could not supply
> it.
> > I activate preamp in vhf band in set menu of icom radio. The uhf band
> > preamp on and I use it. But for vhf when I push the preamp button in
> front
> > panel of icom the preamp writing is visible for 2 seconds and then
> > turned off and isn?t visible.
> >
> > Any help would be gratefully appreciated.
> >
> > Beat Regards.
> >
> > N.Mahdinejad
> > _______________________________________________
> > 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: 16
Date: Tue, 9 Aug 2011 10:27:21 +0100
From: <g.shirville@xxxxxxxxxx.xxx>
Subject: [amsat-bb] A couple of interesting links
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Message-ID: <866DFA40FA1A4255A172783DA16648A7@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
hi All,
I have just come across this podcast which has a very "British" approach to
space history but is quite enjoyable
http://audioboo.fm/boos/431009-space-boffins-podcast2
Additionally a rather longer film entitled "first orbit" - this has the
exactly the same running time as Gargarin's flight
http://www.firstorbit.org/
enjoy!
73
Graham
G3VZV
------------------------------
Message: 17
Date: Tue, 9 Aug 2011 06:28:55 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat-1: switching modes ?
To: "'PA3GUO'" <pa3guo@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <882B24181AB14A4E8D84F0F59EAD27DE@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Henk,
Was the pass high or low elevation? I had a pass this morning, all in high
power mode, with a 55 degree maximum elevation. Before TCA, I was able to
access the transponder easily. After TCA, it was much harder at the same
ranges. The CW and TLM signals were about the same. It is spinning, but
that will be around an axis. I am wondering if some of the reports of the
transponder being off may be due to the short UHF antenna being blocked in
some orientations?
Alan
WA4SCA
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of PA3GUO
Sent: Monday, August 08, 2011 8:48 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ARISSat-1: switching modes ?
Can someone point me to the ARISSat-1 mode schedules ?
During the recent pass, ARISSat was the first pass in low pwr mode.
During the (short) active periods I could relay short CW beeps over the
transponder @xx.
Midway the pass the satellite came in the sun and switched on and stayed on.
But now the transponder was off.
Is there an overview of sequence of modes, eg when SSTV is on Xponder off,
etc. ?
Henk, PA3GUO,
_______________________________________________
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------------------------------
Message: 18
Date: Tue, 09 Aug 2011 07:40:33 -0400
From: Dave Taylor <dave.w8aas@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Diffference between high and low power modes
on ARRISat-1
To: Mike Ryan <mryan301@xxxxxxx.xxx>, AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <0A02DD14-364D-4BC3-93EC-08020A04A1BB@xxxxxxx.xxx>
Content-Type: text/plain; charset=WINDOWS-1252; format=flowed;
delsp=yes
These modes are confusingly named. The transmit power is the same in
both; what changes is the power consumption. Better to think of it as
high vs low duty cycle. I don't recall the low power duty cycle for
sure, but it's something like 40 seconds on/2 minutes off. This
happens automatically during eclipse.
-- Dave, W8AAS
On Aug 8, 2011, at 11:09 PM, Mike Ryan wrote:
> Whats the difference between high and low power mode? I know its
> determined by being in eclipse or not and I believe high power is
> 0.5 W on SSB and FM. But no luck in finding more info than that on
> the web about power.
>
> So far, all passes I?ve been able to copy here Eastern US are late
> at night (11PM-1AM) so I?m assuming I?m getting low power mode.
>
> Mike WB1AAT
> _______________________________________________
> 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 449
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