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CX2SA > SATDIG 29.12.09 13:36l 869 Lines 28024 Bytes #999 (0) @ WW
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Sent: 091229/1130Z @:CX2SA.LAV.URY.SA #:28760 [Minas] FBB7.00e $:AMSATBB4687
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. sat_reporter (Andrew Rich)
2. AO-51 mode change and recommendation (Andrew Glasbrenner)
3. HELP WITH YAESU FT 847 CAT CONTROL SETUP (Albert Onley)
4. HO-68 (Dale Hershberger)
5. Re: multiple sats (Larry Gerhardstein)
6. back on the birds after 15-year absence - want tips on
antenna system (William Hein)
7. Re: back on the birds after 15-year absence - want tips on
antenna system (Nigel Gunn G8IFF/W8IFF)
8. Re: HELP WITH YAESU FT 847 CAT CONTROL SETUP (Alan P. Biddle)
9. Re: AO-51 mode change and recommendation (Peter)
10. Re: back on the birds after 15-year absence - want tips on
antenna system (Andrew Glasbrenner)
11. Re: back on the birds after 15-year absence - want tips
onantenna system (Peter)
12. Re: sat_reporter (Andrew Rich)
13. Re: HELP WITH YAESU FT 847 CAT CONTROL SETUP (David Wing)
14. Re: HELP WITH YAESU FT 847 CAT CONTROL SETUP (K3RWN)
15. First QSO'S on HO-68 linear Xponder (Luc Leblanc)
16. Re: HELP WITH YAESU FT 847 CAT CONTROL SETUP (Andrew Rich)
17. UGATUSat is RS-38 (Mike Rupprecht)
18. AO-51 mode change and recommendation (vk5alx@xxxxx.xxxx
19. Re: Question about vacuum and power module for
lineartransponder (Michael Fletcher)
----------------------------------------------------------------------
Message: 1
Date: Tue, 29 Dec 2009 08:39:12 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] sat_reporter
To: <amsat-bb@xxxxx.xxx>
Message-ID: <A24275073CC548049F9B0F97F074C7BB@xxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
I am putting together a sat_report web based system
My fields at the moment are
1. From
2. Subject
3. Satellite
4. Frequency /s
5. Mode /s
6. Notes
7. Country
Would you like to see anything else ?
1. Station setup
2. Signal report
3. File attachments
Prototype
http://vk4tec.no-ip.org/sat_report/index.htm
Andrew Rich VK4TEC
------------------------------
Message: 2
Date: Mon, 28 Dec 2009 19:13:24 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] AO-51 mode change and recommendation
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <4B3949A4.4000600@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
AO-51 has been switched to the SSB/FM crossmode repeater, 145.880 USB
up, 435.150 FM down. Power output is 1.93 watts. The downlink modulation
is set very high, so that even very weak signals will be audible. The
downside to this is that someone running excessive power will cause the
downlink to distort.If this happens I'll be forced to adjust the
modulation level down, or possibly end the mode early. For a "normal"
station, 5 watts on the uplink to a modest gain antenna is entirely
sufficient. Please use the minimum power necessary. This mode -requires-
tuning the SSB uplink precisely for Doppler, and to effectively do that
you will need full duplex.
Please use this for voice communications only, until Straight Key Night,
when CW will be the designated mode.
Thanks, and enjoy this unusual mode.
73, Drew KO4MA
AMSAT-NA VP Operations
------------------------------
Message: 3
Date: Mon, 28 Dec 2009 19:47:43 -0500
From: "Albert Onley" <k4vhv@xxxx.xxx>
Subject: [amsat-bb] HELP WITH YAESU FT 847 CAT CONTROL SETUP
To: "Amsat -bb" <amsat-bb@xxxxx.xxx>
Message-ID: <3710848FEE364ACFBA03FA3F4E124095@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
I am trying to get my ft 847 to work in CAD mode . I have the C+ on,
using NULL MODEM
CABLE ,baud set to 57600 BOTH IN RADIO AND PROGRAM , using COM 1. RUNNING
XP HOME WITH SP 2. AL K4VHV
------------------------------
Message: 4
Date: Mon, 28 Dec 2009 16:06:37 -0900
From: Dale Hershberger <daleh@xxxxxx.xxx>
Subject: [amsat-bb] HO-68
To: amsat bbs <amsat-bb@xxxxx.xxx>
Message-ID: <4B39561D.4060108@xxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I am having a difficult time to access HO-68. I have it in my tracking
programs along with
SO-67. The problem is that the listed times for HO-68 and the scheduled
times as posted
for times do not seem to work for me. SO-67 works for me and I have
accessed it ok
but have I yet to be successful in getting into HO-68. I know it is a
dumb thing I am overlooking
and will kick my self when I get it right. I had some good passes
according to SatPC32
and NOVA but all I hear is silence... I have checked for the mode, FM
and Linear.
I have the tone set but I know there is something I am overlooking. Any
help is
greatly appreciated....Had a busy Holiday weekend. And want to thank
our China AMSAT friends for what sounds like a very good new Satellite.
Thank you to Alan Kung, BA1DU and friends for this very nice Christmas
gift.
Dale/ KL7XJ
------------------------------
Message: 5
Date: Mon, 28 Dec 2009 09:59:16 -0700
From: Larry Gerhardstein <gerhardstein@xxxxxxx.xxx>
Subject: [amsat-bb] Re: multiple sats
To: amsat-bb@xxxxx.xxx
Message-ID: <4B38E3E4.1020708@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thanks to all who answered with the same answer to my question about
displaying multi-sats. Amazing how well it works to read the
instructions. <|:^) 73, Larry W7IN
------------------------------
Message: 6
Date: Mon, 28 Dec 2009 12:20:52 -0600
From: William Hein <bill.aa4xt@xxxxx.xxx>
Subject: [amsat-bb] back on the birds after 15-year absence - want
tips on antenna system
To: amsat-bb@xxxxx.xxx
Message-ID: <A51C267B-D7DA-41E5-A2A8-56BBF590DEA9@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I was an active Satellite operator back in the AO-10, AO-13 and Radio
Sputnik days (as AA6TT) and am just getting back on the birds after a near
15-year absence and am getting used to today's LEO sats. I completely
missed AO-40. VERY surprised to learn AO-7 is QRV!
I presently have an Arrow antenna on a tripod located indoors. Rig is a
FT-847 with MacDoppler tracking software. I successfully heard the 70cm CW
beacon from HO-68 earlier today so it's nice to know everything works. Will
be attempting QSOs on future passes on this and other LEO birds.
I will be building a more robust outdoor antenna system in a few months and
want to make sure I am prepared for the satellites which may be launched in
the next few years.
Here is what I am thinking (overkill for LEO birds but I want to be ready to
MEO & HEO sats):
10m Dipole
V M2 2M-CP14 or Gulf Alpha 2M-8ELSat and SSB Electronic mast-mounted preamp
U M2 436CP-30 or Gulf Alpha 70CM-16ELSat and SSB Electronic mast-mounted
preamp
Questions:
(1) RHCP for the V and U Yagis? Any reason to have switchable polarity?
(2) Anyone who has used both M2 and Gulf Alpha satellite antennas please
comment on their relative merit.? I find M2 on-air performance to be very
good however I have had problems with M2 feed-point failures.
(3) Will next gen ham satellites have S-Band downlinks?
(4) Will next gen ham satellites have L-Band uplinks and/or downlinks?
(5) Other bands to be prepared for?
(6) Are these the satellites currently available for 2-way QSOs? AO-7,
AO-27, AO-51, SO-67 & HO-68. Did I miss any?
(7) Any pattern to when AO-7 is in Mode A and Mode B?
73,
Bill
-----
William Hein, AA4XT
mobile: +1 (615) 967-1226
email: Bill.AA4XT@xxxxx.xxx
Loc: EM65PS
Web: AA4XT.com
6752 Owen Hill Road
College Grove TN 37046-9122
USA
------------------------------
Message: 7
Date: Tue, 29 Dec 2009 02:02:54 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: back on the birds after 15-year absence - want
tips on antenna system
To: William Hein <bill.aa4xt@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4B39634E.7010003@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Welcome back Bill.
My last sat QSO was via Oscar 8.
William Hein wrote:
> I was an active Satellite operator back in the AO-10, AO-13 and Radio
Sputnik days (as AA6TT) and am just getting back on the birds after a near
15-year absence
------------------------------
Message: 8
Date: Mon, 28 Dec 2009 20:03:29 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: HELP WITH YAESU FT 847 CAT CONTROL SETUP
To: "'Albert Onley'" <k4vhv@xxxx.xxx>, "'Amsat -bb'"
<amsat-bb@xxxxx.xxx>
Message-ID: <DC9AD77BB8A54139B2899920FB45598E@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Al,
A bit more information please. Does the rig go into CAT mode when you click
on the "C?" If not, what sort of serial port are you using? Have you tried
the cable and port with another program? If so, what, exactly, isn't
working? Also, which satellite are you trying to control.
Alan
WA4SCA
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Albert Onley
Sent: 28 December, 2009 18:48
To: Amsat -bb
Subject: [amsat-bb] HELP WITH YAESU FT 847 CAT CONTROL SETUP
I am trying to get my ft 847 to work in CAD mode . I have the C+ on,
using NULL MODEM
CABLE ,baud set to 57600 BOTH IN RADIO AND PROGRAM , using COM 1. RUNNING
XP HOME WITH SP 2. AL K4VHV
_______________________________________________
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: 9
Date: Mon, 28 Dec 2009 21:10:19 -0500
From: Peter <roi@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 mode change and recommendation
To: AMSAT-BB@xxxxx.xxx
Message-ID: <002801ca882c$15a42d20$6901a8c0@xxxxx>
Content-Type: text/plain; charset=Windows-1252
Drew,
Thank you for the mode switch, should be fun!! Congratulations on your
contacts and analysis for XO-68, your were featured on Amateur Radio
Newsline, this evening.
I want to wish you and your family a Healthy and Peaceful New Year.
73,
Pete, WB2OQQ
AMSAT Area Coordinator
------------------------------
Message: 10
Date: Mon, 28 Dec 2009 21:27:25 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: back on the birds after 15-year absence - want
tips on antenna system
To: William Hein <bill.aa4xt@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4B39690D.4010504@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Welcome back! I'll try to answer what I can.
> Questions:
>
> (1) RHCP for the V and U Yagis? Any reason to have switchable polarity?
>
Some LEOs have different circularities for different transmitters. For
example, AO-51 has both LHCP and RHCP on 70cm. The sense can also change
during a pass depending on spacecraft orientation and squint. Switchable
polarity is well worth it in my opinion.
> (3) Will next gen ham satellites have S-Band downlinks?
>
Yes, and AO-51 has an S downlink now, usually about 1 week a month. P3E
and others will have S.
> (4) Will next gen ham satellites have L-Band uplinks and/or downlinks?
>
Yes, and AO-51 and CO-65 use L now also. Kiwisat and P3E will have L also.
> (6) Are these the satellites currently available for 2-way QSOs? AO-7,
AO-27, AO-51, SO-67 & HO-68. Did I miss any?
>
Off the top of my head, add ISS, SO-50, VO-52, FO-29 (due to return
soon), NO-44 sometimes, CO-65 for a real digital challenge. Lots of
one-way cubesats that can be fun too.
> (7) Any pattern to when AO-7 is in Mode A and Mode B?
>
Right now the satellite is in 24/7 illumination, and the onboard timer
switches modes every 24 hours or thereabouts. Check
http://oscar.dcarr.org/ as a quick way to figure out which one is on
right now. When it returns to eclipses, it generally favors B and only
works while illuminated.
I hope that helps. Joining AMSAT if you're not already a member is a
good way to support the program, and there is always something
interesting in the AMSAT Journal. There are several active ops in your
immediate area, including a BOD member; they may chime in. See ya on the
air soon.
73, Drew KO4MA
------------------------------
Message: 11
Date: Mon, 28 Dec 2009 21:37:22 -0500
From: Peter <roi@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: back on the birds after 15-year absence - want
tips onantenna system
To: AMSAT-BB@xxxxx.xxx
Cc: William Hein <bill.aa4xt@xxxxx.xxx>
Message-ID: <002f01ca882f$dfffbc80$6901a8c0@xxxxx>
Content-Type: text/plain; charset=Windows-1252
Bill,
Welcome back to the Satellite community, it's an exciting time to be
"satellite active"!! You asked a bunch of good questions, most of your
answers can be found by visiting www.amsat.org. When your at the site on
the left column look for AMSAT Site Menu" scroll down to about eleven items
to AMSAT video news and listen to Dayton 2009 ,Barry Baines excellent
presentation on the direction of the program. I think his remarks will
answer most of your questions. Bill, have a Healthy and Satellite filled
NEW Year, hope to work you on the "birds".
73,
Pete, WB2OQQ
AMSAT Area Coordinator
------------------------------
Message: 12
Date: Tue, 29 Dec 2009 12:58:49 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: sat_reporter
To: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <23AD3EDB1A13429DAAD6416D91D9BE5E@xxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Ok its basically working.
I will next make up a "view record" pane
My intention is to make it very close to an email type system.
Andrew VK4TEC
----- Original Message -----
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Tuesday, December 29, 2009 8:39 AM
Subject: [amsat-bb] sat_reporter
>I am putting together a sat_report web based system
>
> My fields at the moment are
>
> 1. From
> 2. Subject
> 3. Satellite
> 4. Frequency /s
> 5. Mode /s
> 6. Notes
> 7. Country
>
> Would you like to see anything else ?
>
> 1. Station setup
> 2. Signal report
> 3. File attachments
>
> Prototype
>
> http://vk4tec.no-ip.org/sat_report/index.htm
>
> Andrew Rich VK4TEC
>
> _______________________________________________
> 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
------------------------------------------------------------------------------
--
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.431 / Virus Database: 270.14.122/2591 - Release Date: 12/28/09
19:32:00
------------------------------
Message: 13
Date: Mon, 28 Dec 2009 19:48:55 -0800
From: "David Wing" <david@xxxxxx.xxx>
Subject: [amsat-bb] Re: HELP WITH YAESU FT 847 CAT CONTROL SETUP
To: "'Albert Onley'" <k4vhv@xxxx.xxx>, "'Amsat -bb'"
<amsat-bb@xxxxx.xxx>
Message-ID: <E825893820CF4F15BD07112D2AFB19B6@xxxxx>
Content-Type: text/plain; charset="us-ascii"
Al, I find that I need to toggle from C+ to C- and back to C+ in order to
get things to work on my FT-847. I usually select the satellite, turn on
the rotator, turn on the radio and then toggle the CAT control...see if this
helps.
FYI, I also have my CAT rate at 57600...can't seem to find that setting in
SatPC32 anywhere though. I'm using an ACER Netbook running XP, com4 for
radio, com6 for rotator and using RT Systems serial to USB converters...and
a real null modem cable on the CAT (not all cables are null modem).
73
David
K6CDW
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Albert Onley
Sent: Monday, December 28, 2009 4:48 PM
To: Amsat -bb
Subject: [amsat-bb] HELP WITH YAESU FT 847 CAT CONTROL SETUP
I am trying to get my ft 847 to work in CAD mode . I have the C+ on,
using NULL MODEM
CABLE ,baud set to 57600 BOTH IN RADIO AND PROGRAM , using COM 1. RUNNING
XP HOME WITH SP 2. AL K4VHV
_______________________________________________
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: Mon, 28 Dec 2009 23:08:24 -0500
From: "K3RWN" <rwnewbould@xxxxxxx.xxx>
Subject: [amsat-bb] Re: HELP WITH YAESU FT 847 CAT CONTROL SETUP
To: "'David Wing'" <david@xxxxxx.xxx>, "'Albert Onley'"
<k4vhv@xxxx.xxx>, "'Amsat -bb'" <amsat-bb@xxxxx.xxx>
Message-ID: <9884CA9F06B648288FE8A70D664104B6@xxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
I would agree with Dave. Mine works by toggling the C- C+. One note. Are
you using the Yaesu Autotuner? I believe the Cat Port does not function
when the autotuner is plugged in.
Rich
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of David Wing
Sent: Monday, December 28, 2009 10:49 PM
To: 'Albert Onley'; 'Amsat -bb'
Subject: [amsat-bb] Re: HELP WITH YAESU FT 847 CAT CONTROL SETUP
Al, I find that I need to toggle from C+ to C- and back to C+ in order to
get things to work on my FT-847. I usually select the satellite, turn on
the rotator, turn on the radio and then toggle the CAT control...see if this
helps.
FYI, I also have my CAT rate at 57600...can't seem to find that setting in
SatPC32 anywhere though. I'm using an ACER Netbook running XP, com4 for
radio, com6 for rotator and using RT Systems serial to USB converters...and
a real null modem cable on the CAT (not all cables are null modem).
73
David
K6CDW
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Albert Onley
Sent: Monday, December 28, 2009 4:48 PM
To: Amsat -bb
Subject: [amsat-bb] HELP WITH YAESU FT 847 CAT CONTROL SETUP
I am trying to get my ft 847 to work in CAD mode . I have the C+ on,
using NULL MODEM
CABLE ,baud set to 57600 BOTH IN RADIO AND PROGRAM , using COM 1. RUNNING
XP HOME WITH SP 2. AL K4VHV
_______________________________________________
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: 15
Date: Mon, 28 Dec 2009 21:22:04 -0500
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] First QSO'S on HO-68 linear Xponder
To: amsat-bb@xxxxx.xxx
Cc: eu-amsat@xxxxxxxxxxx.xxx
Message-ID: <4B39217C.1282.16C49B0@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=US-ASCII
Just got my first few QSO'S on the linear transponder of HO-68. It was like
a small motel room with all efficiencies but walls are in
cardbox and you can hear the 3 rooms on each side. But what an excellent
signal and audio was Q5 on any station i was able to hear. It was
like 20 meter band on a contest day...
Recommendation just tune the higher frequency (The downlink). Messing with
the uplink just not work as you step over a lot of stations. It
is by far the strongest linear satellite and i will try auto doppler on the
next linear session. I count about 15 simultaneous station at
the same time and the dowlink power was holding even with some excessive
uplink power at times! It is understandable as the new toy was
just getting out of the box...
As the power budget is higher the transponder is able to give enough signal
to a lot more stations. The key is high downlink power to be
able to sustain more station at the same time. But just try to reduce your
power when the satellite is overhead he's just above you at TCA
Time to Closest Approach
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 16
Date: Tue, 29 Dec 2009 17:15:12 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: HELP WITH YAESU FT 847 CAT CONTROL SETUP
To: "Albert Onley" <k4vhv@xxxx.xxx>, "Amsat -bb" <amsat-bb@xxxxx.xxx>
Message-ID: <C003558FECC44E0B9C9C6B55B1693E94@xxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Dude
Turn your caps lock off
----- Original Message -----
From: "Albert Onley" <k4vhv@xxxx.xxx>
To: "Amsat -bb" <amsat-bb@xxxxx.xxx>
Sent: Tuesday, December 29, 2009 10:47 AM
Subject: [amsat-bb] HELP WITH YAESU FT 847 CAT CONTROL SETUP
> I am trying to get my ft 847 to work in CAD mode . I have the C+ on,
> using NULL MODEM
> CABLE ,baud set to 57600 BOTH IN RADIO AND PROGRAM , using COM 1.
> RUNNING XP HOME WITH SP 2. AL K4VHV
> _______________________________________________
> 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
------------------------------------------------------------------------------
--
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.431 / Virus Database: 270.14.122/2591 - Release Date: 12/28/09
19:32:00
------------------------------
Message: 17
Date: Tue, 29 Dec 2009 11:16:02 +0100
From: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>
Subject: [amsat-bb] UGATUSat is RS-38
To: <amsat-bb@xxxxx.xxx>
Message-ID: <002f01ca886f$ed2ce410$c786ac30$@xx>
Content-Type: text/plain; charset="us-ascii"
09:48 UTC strong CW beacon on 435.490MHz
rs38 ubs189 uab176 [DATA]
rs38 ubs188 uab177 ibs17 iab110 isp0 tab156 tsep146 tuf0 tbi167 tspa134
tspb255 mcon69 sma115 smb111 mra11 mrb14
rs38 ubs189 uab177 ibs17 iab130 isp22 tab156 tsep146
audio file of a complete beacon record (4 min) here:
<http://www.dk3wn.info/p/?p=10401> http://www.dk3wn.info/p/?p=10401
73, Mike
DK3WN
------------------------------
Message: 18
Date: Tue, 29 Dec 2009 21:57:18 +1030
From: vk5alx@xxxxx.xxx
Subject: [amsat-bb] AO-51 mode change and recommendation
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <1778669654.20091229215718@xxxxxxxxx.xx.xxx>
Content-Type: text/plain; charset=iso-8859-15
Attempted to use this mode on 2 passes but was not successful.
Several stations tried to work on the first pass over Australia
(07:51 UTC 29 Dec) but audio was very weak and there was a lot of
interference on the signal.
Some stations had difficulty netting onto frequency, probably because
they could not hear themselves clearly.
On the second pass I could hear no other stations attempting to access
and while the downlink signal was strong there were all manner of
noises present and only once or twice could I actually hear my voice
among the noises.
I'm sure that last time AO-51 was in this mode it worked reasonably
well.
Will be interested to hear reports from other continents to see if the
interference was specific to this region.
73
Alex / VK5ALX
------------------------------
Message: 19
Date: Tue, 29 Dec 2009 13:27:47 +0200 (EET)
From: Michael Fletcher <oh2aue@xxxxxxxx.xx>
Subject: [amsat-bb] Re: Question about vacuum and power module for
lineartransponder
To: amsat-bb@xxxxx.xxx
Cc: oh2aue@xxxx.xx
Message-ID: <7521298.2916631262086068357.JavaMail.oh2aue@xxxxxxxx.xx>
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>>> Hi AMSATs,
>>>
>>> After many work on my transponder design I decided to put some work in
>>> extending my lab.
>>> One of the things I liked to have is a vacuum test chamber, to test
electronics
>>> under vacuum conditions.
>>>
>>> I have looked around and I see all kind of classes of vacuum pumps, and
their
>>> equal increasing price.
>>> My question is how deep the vacuum has to be to be able to do a valide
test on
>>> (space) electronics working under space vacuum conditions ?
>>>
>>> I also would like to know if anyone has experience in SSB mode with the
new
>>> power modules types from Mitsubishi. Like the RA60H1317M, which can give
60W
>>> power on 2m with only 50mW input power.
>>> I am looking for some PA behind my LE005-R2 transponder design, to get a
small
>>> sized high-power linear transponder. The transponder gives 200mW PEP, so
the
>>> 50mW is no problem at all.I just wonder how linear these Mitsubishi
modules
>>> are, when using in linear mode.
>>>
>>> In the datasheet it says that they 'may ?lso be used for linear
mouldation",
>>> which doesn't give many guarenty. Any experience with these modules in
linear
>>> (SSB) mode are welcome.
>>>
>>> 73 de PE1RAH, William Leijenaar
>>> For my small mode-uv transponder design, please check:
>>> www.leijenaarelectronics.nl
>>> ---
>> Hi William.
>>
>> A better solution would be to build a class AB linear from 2 suitable
>> FETs. An even better solution but one requiring a lot of development
>> would be to separate the modulation into phase and amplitude and then
>> modulate the gate with phase and drain with amplitude. Efficiency >80%
>>
>>
>> David
> Hi David, G0MRF
>
> What you suggest is the HELAPS principle of Envelope Elimination and
> Restoration that was used in all linear transponders from OSCAR-6 ,OSCAR-7
> OSCAR-10 and OSCAR-13 with an efficiency of about 85 %
>
> http://www.amsat-dl.org/dl/HELAPS_en.pdf
>
> The above is a complete description of the HELAPS principle written by
> Dr. Karl Meinzer DJ4ZC with all functional schematic diagrams of the
> linear transponder Mode-B on board of OSCAR-7
>
> I hope it helps William PE1RAH
>
> 73" de
>
> i8CVS Domenico
William,
regarding vacuum, you need to be able to simulate the space environment
as accurately as possible. This means you need to be able to create a
high vacuum of the order of 1E-7 Torr or better. Going all the way to 1E-9
Torr and beyond would be great and the Big Guys even use ion getters to
grab the last floating molecules captured to make the chamber resemble
real space...
AMSAT has experience e.g. with failure of a particular type of RF capacitor
that fails _only_ in high vacuum, so the only way to segregate the good
ones from the bad ones is (thermal) high vacuum. And when finding such a
failure and having corrected it (you think), you _must_ take the time,
patience and money to _redo_ the test to ensure your results. At the same
time you need to slowly cycle through your planned temperature cycle, e.g.
-40 ... +60 degrees C or whatever.
Regarding HELAPS (or whatever other type of efficiency and linearity
improving technology you want to use), this is the only way to go with
a) limited power available, b) maximum RF output power needed and c)
limited thermal dissipation possible in space.
The old AO-07 is a favourite of mine. Here is the block diagram of the
Mode B transponder (in Finnish) showing the components used for each
stage:
http://www.kolumbus.fi/michael.fletcher/ao_07b.gif
For those interested, here is breadboard of an early 10 GHz HELAPS
experiment:
http://www.kolumbus.fi/michael.fletcher/X_band_HELAPS_2.jpg
Back then, AMSAT-OH was not feeling confident in building a flightworthy
10 MHz SMPS HELAPS modulator, but since then I have been looking at a
12-polyphase modulator concept. The reliability issue here is a statistical
one with the component count rising pretty rapidly. I just have personal
dinosaur thing about wanting to experiment with this stuff in the analogue
way ;-)
73, Michael, OH2AUE
------------------------------
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End of AMSAT-BB Digest, Vol 4, Issue 687
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