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CX2SA > SATDIG 30.12.08 23:53l 854 Lines 24967 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. lindenblad observations (francesco messineo)
2. Mesh Diosh and GS-5500 (D. Mynatt)
3. Re: ISS Repeater (n1jez@xxxxxxxxxxxxxxxxx.xxxx
4. FT817 issues SATPC32 (Dr. Jay Garlitz)
5. ISS Repeater (n1jez@xxxxxxxxxxxxxxxxx.xxxx
6. Re: ISS Repeater (jeff kb2m)
7. Re: ISS Repeater (n1jez@xxxxxxxxxxxxxxxxx.xxxx
8. Re: ISS Repeater (Alan P. Biddle)
9. LOTW and Logging Info (Gary "Joe" Mayfield)
10. Re: ISS Repeater (k0qh@xxxxxxxxx.xxxx
11. Re: help with 817 and satpc32 (Erich Eichmann)
12. Re: ISS Repeater (Alan P. Biddle)
13. Re: ISS Repeater (morsesat@xxxxxxxxx.xxxx
14. ARISS antennae (Alan Sieg WB5RMG)
15. Re: ARISS antennae (Bob Bruninga )
----------------------------------------------------------------------
Message: 1
Date: Tue, 30 Dec 2008 10:17:20 +0100
From: "francesco messineo" <francesco.messineo@xxxxx.xxx>
Subject: [amsat-bb] lindenblad observations
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Message-ID:
<d9f2bc20812300117i803f548wf8eaab4ccf933237@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Good morning all,
even if this setup probably won't be used by anyone I thought I'd
share my findings.
I've built a couple of lindenblads following the AA2TX articles. The
EZ-lindenblad for 2m and the parasitic lindenblad for 70cm. This is
for a 2 week temporary location in IS0 (JM49MG).
Both antennas have been made with locally available hardware, not very
far from original design anyway. The biggest difference is perhaps the
parasitic elements for the 70 cm one which have a 4mm diameter instead
of approximately the 3mm of original design.
Both antennas are on the same pole, 1.5 meters apart and not very far
from the roof (< 1m the 2m one), they have however a clear sky view.
Cable runs are quite long, 20m of rg-213 on both bands and no preamps.
Only RHCP versions made.
Rig is ft-847 with internal preamps on.
In 4 days I have tried almost all LEOs (but AO-16 and AO-27 which are
non operational afaik).
DO-64: never heard anything (is it operational?)
AO-51: 435.300 output can be heard at times, some callsing can be
undestood, never quieting the receiver. FM uplink in europe is too
crowded to attempt any try at txing. 435.150 output is much lower than
the 435.300 one, only rarely it can be heard but when it's heard I can
hear myself briefly from the USB uplink. Obviously no contact is
possible.
SO-50: usually can't be heard, sometimes during a pass on positive
QSBs the downlink can be heard very noisy and for a short time (so far
only copied a full callsign).
AO-07: downlink on mode B can be heard quite easily down to 3 degrees,
uplink is next to impossible (50W out of the rig, CW only of course)
but probably depends on the high level of power used in europe as
during a pass over the atlantic and part of brazil I could hear my own
signal down to 3 degrees and I couldn't hear any other signal. No
contacts have been made, so far only heard my own signal a few times
and very low (maybe the 432 MHz uplink is too far out of the optimal
passband of the 435 MHz lindy?)
FO-29: downlink can be heard, not very strong but workable, uplink is
sometimes difficult but a lot easier than AO-07. No contacts made so
far, have been calling CQ in CW for a few passes.
VO-52: downlink easy to copy as on AO-07, quite easy to hear my own CW
peaking at S3 during all passes over 5 degrees, no contacts made,
heard only a lot of SSB stations, this is the easier sat with this
setup.
ISS: never heard any signal so far.
I think I'll go back to the homemade V/U yagi "arrow" like on next
travels, that's a real performer on LEOs.
PS: the NB on FT-847 (first time using this rig) is quite uneffective,
motors on the street still make an audible signal when passing by,
it's attenuated but not like on all other rigs I know. Is there any
fix for it?
73
Frank IS0/IZ8DWF
------------------------------
Message: 2
Date: Tue, 30 Dec 2008 03:03:55 -0700
From: "D. Mynatt" <dave@xxxxxx.xxx>
Subject: [amsat-bb] Mesh Diosh and GS-5500
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <6548BA222E6C458092FFD88708D32CB9@xxxxxx>
Content-Type: text/plain; charset="Windows-1252"
I have been given a 7ft mesh dish from a local college but without a rotor or
Az/El mechanism. I might be able to find a GS-5500 and was wondering what the
group thought of using it as an Az/El system for the mesh. A commercial
system would cost more than three times the price of a GS-5500.
Any thoughts from the group?
Dave // DM78qd // KA0SWT
------------------------------
Message: 3
Date: Tue, 30 Dec 2008 06:34:55 -0500
From: <n1jez@xxxxxxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: <david.barber@xxxxxxxxxxxxx.xx.xx>, <amsat-bb@xxxxx.xxx>
Message-ID: <AB1BC07C6A014C7C968501EB4529853F@xxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Yeah, close enough. I hope to try the 1235 UTC pass coming up in an hour
from now.
73,
Mike, N1JEZ
AMSAT 29649
"A closed mouth gathers no feet"
----- Original Message -----
From: "David Barber" <david.barber@xxxxxxxxxxxxx.xx.xx>
To: <amsat-bb@xxxxx.xxx>
Cc: <n1jez@xxxxxxxxxxxxxxxxx.xxx>
Sent: Monday, December 29, 2008 8:56 AM
Subject: RE: [amsat-bb] ISS Repeater
> So guy's correct me if I'm wrong but from a rough calculation that puts
> Mike's ERP at 4.7Kw.
>
> Leaving my 170w ERP looking rather meagre by comparison! :-)
>
> Congrats to Mike and Clare on their contact.
>
> Regards
>
> David
> G8OQW
>
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of n1jez@xxxxxxxxxxxxxxxxx.xxx
> Sent: 29 December 2008 12:36
> To: AMSAT BB
> Subject: [amsat-bb] ISS Repeater
>
> Just got on the ISS repeater - L band up and V band down from FN34 here in
> Vermont. I used full power here. 80 watts in the shack to a 55 el 1269
> Directive Systems loop yagi. Transmission line is 75' of 7/8" hardline.
>
> Results were mixed. The pass was 25 degrees max here. I had little to no
> success as the ISS was ascending. I opened the repeater a couple of times.
> I'm not sure if this was because other stations were trying and we were
> clobbering each other or not. As the ISS was going overhead, it appeared
> that the polarity was shifting rapidly as I would open the repeater for
> just
>
> a word or two. I did hear Clare, VE3NPC briefly. As the ISS was
> descending,
> things got better and I was able to consistently open the repeater, but
> nobody came back.... I could not access the repeater below 10 degrees....
>
> If anyone else was on and trying, can you let me know? I'd like to see if
> that was the reason I couldn't access the repeater as it was ascending.
> One
> other observation, I found the doppler correction to be pretty critical.
> I've seen this when running low power into AO-51 for tests.
>
> I hope to try a few more passes this week.
>
> 73,
> Mike, N1JEZ
> AMSAT 29649
> "A closed mouth gathers no feet"
>
> _______________________________________________
> 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: Tue, 30 Dec 2008 07:22:17 -0500
From: "Dr. Jay Garlitz" <drjay@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] FT817 issues SATPC32
To: <amsat-bb@xxxxx.xxx>
Message-ID: <AB6B0DE5B6C149F2B6D48A455D262D52@xxxx>
Content-Type: text/plain; charset="us-ascii"
Tim, I have an FT817 as well and have had the same problem as described. I
hope others can offer suggestions as I had the same experience in searching
the online suggestions and none had it working properly. There were only a
few settings to try to change and none were a solution for me. The
difference here is that is an extra rig for me and not the one I usually use
for satellites.
Jay, AA4FL
Message: 9
Date: Mon, 29 Dec 2008 19:51:29 -0800
From: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] help with 817 and satpc32
To: <amsat-bb@xxxxx.xxx>
Message-ID: <000001c96a31$e6ad0410$b4070c30$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hi all,
I just finally upgraded to general over the weekend, so I went out and got a
Yeasu 817. However, I'm having problems with using it for Doppler tracking
in SatPC32. Here's what it's doing.
When I turn the control on, the radio will track the frequencies that are
showing in SatPC32 for both the uplink and the downlink. It switches between
the uplink and downlink frequencies quite often- about once per second. The
radio will also switch to the correct mode (FM, etc). However, when I hit
PTT, it transmits on the previously stored VFOb frequency.
So, for example....
1) I tune vfoa to 50.1Mhz, AM and vfob to 50.5Mhz, AM
2) I turn CAT control on from SatPC32
3) The radio starts switching between the vhf downlink frequency in USB and
the uhf uplink frequency in USB about once per second to correct for Doppler
4) When I press transmit, it transmits at 50.1Mhz, but in LSB
Obviously, it should be flipping between the VFOs (instead of 2 freq's in
one VFO).
So it seems like its flipping frequencies in one VFO and then trying to
transmit in another VFO, where it changes the mode for transmit, but not the
frequency that was originally stored.
Any help please?
Tim
KC2DDS/AG
------------------------------
Message: 5
Date: Tue, 30 Dec 2008 07:46:34 -0500
From: <n1jez@xxxxxxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] ISS Repeater
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Message-ID: <B60F6D9CA3E243D598102CD4FC821D6C@xxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Had a nice QSO with Clare, VE3NPC via the ISS repeater this morning during
the 1235 pass over Vermont, FN34im. We were alone.
I held the repeater longer today. Doppler tuning seems pretty critical.
Clare was computer controlled. I was using manual tuning (OK, call me old
school...) One of these days I'll hook up the radios for computer tuning. I
got a copy of SatPC32 so maybe it's time.
73,
Mike, N1JEZ
AMSAT 29649
"A closed mouth gathers no feet"
------------------------------
Message: 6
Date: Tue, 30 Dec 2008 07:57:10 -0500
From: "jeff kb2m" <kb2m@xxxxxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: "amsat-bb" <amsat-bb@xxxxx.xxx>
Message-ID: <61FA9E1990284D2AA5D8DD5DE50E1CC2@xxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Just tried to work the ISS L/V pass at 1240z here in fm29. I'm using the
freq pair of 145800,1269650 with SatPC32 . Heard Mike n1jez and Claire
ve3npc, I didn't hear my D/L at all. Mike you called me a couple of times
did you hear me? I'm running 10 watts into 90 foot of 1/2 " hardline feeding
a 55 L directive systems loop yagi, I have about 5.56 watts at the ant
feedpoint. I will try some more tomorrow morning. If this becomes a frequent
mode I will buy a 1.2 gig amp. I wouldn't have much use for it otherwise as
my 1.2 ant is at 17 feet 30 feet above sea level 2 miles from the Ocean. Not
exactly an ideal VHF and above contest location !
73 Jeff kb2m
------------------------------
Message: 7
Date: Tue, 30 Dec 2008 08:04:25 -0500
From: <n1jez@xxxxxxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: "jeff kb2m" <kb2m@xxxxxxx.xxx>, "amsat-bb" <amsat-bb@xxxxx.xxx>
Message-ID: <74E4DE74C39F46DCBD59E24F000B5A09@xxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
----- Original Message -----
From: "jeff kb2m" <kb2m@xxxxxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
> Just tried to work the ISS L/V pass at 1240z here in fm29. I'm using the
> freq pair of 145800,1269650 with SatPC32 . Heard Mike n1jez and Claire
> ve3npc, I didn't hear my D/L at all. Mike you called me a couple of times
> did you hear me?
Hi Jeff, no sorry I didn't hear you....
> I'm running 10 watts into 90 foot of 1/2 " hardline feeding
> a 55 L directive systems loop yagi, I have about 5.56 watts at the ant
> feedpoint. I will try some more tomorrow morning. If this becomes a
> frequent
> mode I will buy a 1.2 gig amp. I wouldn't have much use for it otherwise
> as
> my 1.2 ant is at 17 feet 30 feet above sea level 2 miles from the Ocean.
> Not
> exactly an ideal VHF and above contest location !
If your loop yagi is mounted for horizontal polarization, and you got an
amp, you'd do OK in some of the VHF contests. I assume it's a pretty flat
take off from your QTH?
73,
Mike, N1JEZ
AMSAT 29649
"A closed mouth gathers no feet"
>
> 73 Jeff kb2m
>
>
> _______________________________________________
> 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: 8
Date: Tue, 30 Dec 2008 08:29:22 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: "'amsat-bb'" <amsat-bb@xxxxx.xxx>
Message-ID: <FD77E716C13C45809FD44734B130355F@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Morning,
Heard WB8OTH calling CQ early in the 1410 UTC pass here in TN. Good signal.
Threw everything I had at the bird, but could not get in until after TCA.
Was able to bring it up intermittently on the second half of the pass after
tweaking the TX frequency a bit, but still required significantly more power
than yesterday.
Still haven't found what beam width and direction the antennas view from the
ISS WRT its direction of flight.
Alan
WA4SCA
------------------------------
Message: 9
Date: Tue, 30 Dec 2008 08:44:30 -0600
From: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
Subject: [amsat-bb] LOTW and Logging Info
To: "'Amsat'" <AMSAT-BB@xxxxx.xxx>
Message-ID: <COL0-DAV42CAC73A5018668A8A6A328AE70@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
If anyone is interested it is possible (fairly easy in hind sight) to make
AC Log from N3FJP properly report OSCAR contacts in LOTW automatically.
If you have worked me as kk0sd or ks5z via satellite those contacts should
be in LOTW except for contacts made from my home of the last 2 years. They
will go in next. After that I will go after my ka0yos logs.
Speaking of older logs, has anyone entered QSOs from RS 10/11 in LOTW? My
logs show it as RS 10/11, is there anyway now to determine if it was RS-10
or RS-11?
Thanks and 73,
Joe kk0sd
------------------------------
Message: 10
Date: Tue, 30 Dec 2008 13:03:52 +0000
From: <k0qh@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: n1jez@xxxxxxxxxxxxxxxxx.xxxx "AMSAT BB" <amsat-bb@xxxxx.xxx>
Message-ID: <web-266978125@xxxxx.xxxx.xxx>
Content-Type: text/plain; charset="ISO-8859-1"; format="flowed"
On Tue, 30 Dec 2008 07:46:34 -0500
<n1jez@xxxxxxxxxxxxxxxxx.xxx> wrote:
>Had a nice QSO with Clare, VE3NPC via the ISS repeater
>this morning during
>the 1235 pass over Vermont, FN34im. We were alone.
>
>I held the repeater longer today. Doppler tuning seems
>pretty critical.
>Clare was computer controlled. I was using manual tuning
>(OK, call me old
>school...) One of these days I'll hook up the radios for
>computer tuning. I
>got a copy of SatPC32 so maybe it's time.
>
>73,
>Mike, N1JEZ
>AMSAT 29649
>"A closed mouth gathers no feet"
Good morning Mike, copied you just fine here in MO EM47wx.
I used to be KC2JO when I was stationed at Plattsburgh
AFB. Retired in 1991.
Good luck
73
John,K0QH
>
>_______________________________________________
>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: 11
Date: Tue, 30 Dec 2008 16:13:11 +0100
From: "Erich Eichmann" <erich.eichmann@xxxxxxxx.xx>
Subject: [amsat-bb] Re: help with 817 and satpc32
To: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>
Cc: "Dr. Jay Garlitz" <drjay@xxxxxxxxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID: <5D44A82CD5F34ADEB39E68C9B8DD2FC1@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Tim,
here the program seems to work flawlessly with my FT-817.
I tuned VFO A and B manually to 50.000 MHz and set the mode to AM (both
VFOs). Then I started SatPC32 with CAT steering activated at start (menu
Options). My first satellite is FO-29. The program switched the radio into
Split mode and tuned both VFOs to the correct frequencies and modes
(downlink: VFO B, UHF, USB, uplink: VFO A, VHF, LSB). When I pressed the
PTT button the radio transmitted on the correct VHF uplink in LSB and I
could tune around in the passband with the VFO.
I made the same test but with CAT steering deactivated at program start.
When I activated CAT steering (C+) the program did all settings correctly,
except the uplink mode. This was USB instead of LSB. I clicked the FO-29
ident letter and the uplink mode was then also set correctly to LSB.
My settings in menu Radio Setup: CAT baud rate 38400, CAT delay 110. All 4
checkboxes unchecked. Interval in menu CAT: 70 Hz for SSB, 200 Hz for FM
sats.
73s and Happy New Year,
Erich, DK1TB
----- Original Message -----
From: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Tuesday, December 30, 2008 4:51 AM
Subject: [amsat-bb] help with 817 and satpc32
> Hi all,
>
> I just finally upgraded to general over the weekend, so I went out and got
> a
> Yeasu 817. However, I'm having problems with using it for Doppler tracking
> in SatPC32. Here's what it's doing.
>
>
>
> When I turn the control on, the radio will track the frequencies that are
> showing in SatPC32 for both the uplink and the downlink. It switches
> between
> the uplink and downlink frequencies quite often- about once per second.
> The
> radio will also switch to the correct mode (FM, etc). However, when I hit
> PTT, it transmits on the previously stored VFOb frequency.
>
>
>
> So, for example....
>
>
>
> 1) I tune vfoa to 50.1Mhz, AM and vfob to 50.5Mhz, AM
>
> 2) I turn CAT control on from SatPC32
>
> 3) The radio starts switching between the vhf downlink frequency in USB
> and
> the uhf uplink frequency in USB about once per second to correct for
> Doppler
>
>
> 4) When I press transmit, it transmits at 50.1Mhz, but in LSB
>
>
>
> Obviously, it should be flipping between the VFOs (instead of 2 freq's in
> one VFO).
>
>
>
> So it seems like its flipping frequencies in one VFO and then trying to
> transmit in another VFO, where it changes the mode for transmit, but not
> the
> frequency that was originally stored.
>
>
>
> Any help please?
>
>
>
> Tim
>
> KC2DDS/AG
>
> _______________________________________________
> 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: 12
Date: Tue, 30 Dec 2008 10:00:58 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: "'amsat-bb'" <amsat-bb@xxxxx.xxx>
Message-ID: <FF39B43850DD42DE833F0C8154085193@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Morning again,
Just worked a 15 degree max elevation pass to my west. Heard KB0HH(?)
briefly with a good signal. Above 5 degrees, which is my local horizon +/-
I was able to get a good access. Several very brief dropouts, but
considering the slant range and obstacles, not that unexpected. Held the
bird back down to 5 degrees or so. It still took about 25-30 watts to the
antenna to bring it up.
Last daylight pass. Looks like it is going to be an all nighter. ;)
Alan
WA4SCA
------------------------------
Message: 13
Date: Tue, 30 Dec 2008 16:13:45 +0000 (GMT)
From: morsesat@xxxxxxxxx.xxx
Subject: [amsat-bb] Re: ISS Repeater
To: APBIDDLE@xxxxxxx.xxx
Cc: 'amsat-bb' <amsat-bb@xxxxx.xxx>
Message-ID: <e416be3cb8a6.495a48b9@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Allan & All,
Yes- it sounds great- I hope to work the bird on New Years day. The passes
aren't co-operating with my location when I am available.
Someone should record some audio so we'll give a listen one way or another.
Happy New Year to All in the AMSAT realm & those that want to be !!
73,
Dee, NB2F
----- Original Message -----
From: "Alan P. Biddle"
Date: Tuesday, December 30, 2008 11:05 am
Subject: [amsat-bb] Re: ISS Repeater
To: 'amsat-bb'
> Morning again,
>
> Just worked a 15 degree max elevation pass to my west. Heard KB0HH(?)
> briefly with a good signal. Above 5 degrees, which is my local
> horizon +/-
> I was able to get a good access. Several very brief dropouts, but
> considering the slant range and obstacles, not that unexpected.
> Held the
> bird back down to 5 degrees or so. It still took about 25-30
> watts to the
> antenna to bring it up.
>
> Last daylight pass. Looks like it is going to be an all
> nighter. ;)
>
> Alan
> WA4SCA
>
>
>
> _______________________________________________
> 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: 14
Date: Tue, 30 Dec 2008 10:57:01 -0600 (CST)
From: "Alan Sieg WB5RMG" <wb5rmg@xxxxxxx.xxx>
Subject: [amsat-bb] ARISS antennae
To: amsat-bb@xxxxx.xxx
Message-ID: <1710.198.119.224.78.1230656221.squirrel@xxx.xxxxxxx.xxx>
Content-Type: text/plain;charset=iso-8859-1
WA4SCA asked :
> Still haven't found what beam width and direction the antennas view
> from the ISS WRT its direction of flight.
>>
> I know this is out there, but does anybody have off the top of their head
> a reference on the ISS antenna orientation, and what its view is WRT the
> direction of flight?
Which sent me on a brief scavenger hunt ... with these quick results.
Description (new one is probably available somewhere) of ARISS antenna (2002):
http://spaceflight.nasa.gov/station/reference/radio/antennas.html
(You can click on the pictures for hi-rez views)
The WA1 and WA2 antennae are reportedly on the perimeter of the Zvezda module,
on the nadir (earth-facing) side, near the Soyuz docking port.?.
These appear to be of the flexible spring element type for VHF & UHF,
with a patch-type for L & S band. These also support Russian spacewalk video.
The WA4 antenna reportedly has an element for 10 meters instead of VHF.
A very detailed description of antenna development effort for Columbus Lab :
http://www.ariss-eu.org/columbus.htm
I don't now if these recent tests are with these new Columbus antennae
or the existing elements on the Russian segment. I'm guessing the originals.
In either case, they are considered to be on the earth-facing surface...
Perhaps ARISS team personnel can enlighten us further, with links...
Thanks /;^)
--
<- Licensed in 1976, WB5RMG = Alan Sieg * AMSAT#20554 ->
<- http://www.somenet.net * http://wb5rmg.somenet.net ->
<- http://www.linkedin.com/in/alansieg * My 'Day Job' ->
------------------------------
Message: 15
Date: Tue, 30 Dec 2008 12:14:02 -0500 (EST)
From: "Bob Bruninga " <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: ARISS antennae
To: Alan Sieg WB5RMG <wb5rmg@xxxxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID: <20081230121402.AIN03666@xxx.xxxxxxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
>> Still haven't found what beam width
>> and direction the antennas view
>> from the ISS WRT its direction of flight.
> ...In either case, they are considered
> to be on the earth-facing surface...
Actually, an "earth facing" antenna can be confusing to some. Because only
about 5% or less of the earth bound users that are in view are "under" the
ISS. Whereas 95% of them are to the side in all directinos most of the time.
In fact, almost 70% of them are within just 20 degrees of horizontal in all
directions from the ISS. So, a "down" antenna with any gain, is not the ideal
spacecraft antenna.
See the plot of elevation angle versus distance and time in view on this web
page: www.aprs.org/rotator1.html
That sketch is shown from the perspective of the ground station, but just turn
it upside down, and you see that almost all communications to the ISS are
"from the side"...
Good luck!
Bob, Wb4APR
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End of AMSAT-BB Digest, Vol 3, Issue 682
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