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CX2SA > SATDIG 25.09.09 21:13l 745 Lines 22368 Bytes #999 (0) @ WW
BID : AMSATBB4496
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Subj: AMSAT-BB-digest V4 496
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Sent: 090925/1904Z @:CX2SA.LAV.URY.SA #:5138 [Minas] FBB7.00e $:AMSATBB4496
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Arrow antenna reconfiguration results - UPDATE (Jeff Yanko)
2. Re: Antenna Polarization (i8cvs)
3. OT: CQWW RTTY (Jeff Yanko)
4. Sat status (Andrew Rich)
5. Re: New Board (Stephen E. Belter)
6. Re: New Board (Alan P. Biddle)
7. SwissCube telemetry (Mike Rupprecht)
8. Re: Arrow antenna reconfiguration results - UPDATE
(Bruce Robertson)
9. Only Two Weeks Away (Martha)
10. All Satellites (Nigel Gunn G8IFF/W8IFF)
11. Re: Arrow antenna reconfiguration results - UPDATE (James Duffey)
----------------------------------------------------------------------
Message: 1
Date: Fri, 25 Sep 2009 02:10:24 -0700
From: "Jeff Yanko" <wb3jfs@xxx.xxx>
Subject: [amsat-bb] Arrow antenna reconfiguration results - UPDATE
To: <amsat-bb@xxxxx.xxx>
Message-ID: <C2846CEB72CD47ED99118F8D5F060D70@xxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi all,
A quick update to my new project to improving the Arrow antenna, efficiency
wise. I wanted to see how well it would perform on gaining and losing
access during AOS and LOS. AO-27 is not a good choice since the timer is
turned on when it is well above the AOS horizon and it is switched off
before it reaches its LOS horizon. That leaves a dependable AO-51 to test
it out.
With the last setup, the OEM diplexer provided by Arrow Antenna, I would
copy AO-51 about 3 minutes after AOS and lose it about 3 to 4 minutes before
LOS. Not bad, but people were saying they worked the birds when they were 1
degree off of the horizon. I have some pine trees that could be an issue
but they are spaced far enough apart that I can work between them and I also
have to deal with the McCollough Range to the SSE of me here in Las Vegas,
NV. Today, there were 2 passes of AO-51, one at 12 degrees elevation, the
other at 74 degrees. During both passes, I began to copy the downlink about
a 1.25 minute after AOS. A considerable difference from 3 minutes. The
downlink also improved down to about minute before LOS. On the last pass I
worked KG6NUB at 0124z and LOS was 0125z and my downlink sounded fairly
good, though I was fighting desense. (That's another issue I need to
resolve.) Also, on both passes, I never once lost the downlink. No
dropouts or fades. I'm still amazed.
Another issue I came across was how wide the beamwidth is of the Arrow
Antenna between the Arrow diplexer and the new diplexer. I was wondering if
this was going to happen and it did. The reason that this happened was with
the old diplexer, the signal attenuated so much that you had to be pointed
right smack dab on the bird, a few degrees off and you lost the signal.
Now, with the new diplexer, you can point the beam in the general direction
and still copy the bird. In most cases I had to turn the beam 90 degrees
before I completely lost the downlink! Twisting the antenna to make
polarization changes makes absolutely no difference now. This also
attributes to the fact that now I'm copying the entire pass without dropouts
or fades. Makes sense. What I've regained over the lossy diplexer makes up
for any polarization differences, etc. for a better copiable signal.
Next weekend I will have to try more passes and get a feel of how much this
system has changed.
73,
Jeff WB3JFS
Las Vegas, NV
DM26
------------------------------
Message: 2
Date: Fri, 25 Sep 2009 12:04:13 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: Antenna Polarization
To: "Patrick Domack" <patrickdk@xxxxxxxxx.xxx>, "AMSAT-BB"
<amsat-bb@xxxxx.xxx>
Message-ID: <001601ca3dc7$899e0020$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Patrick Domack" <patrickdk@xxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Wednesday, September 23, 2009 4:11 AM
Subject: [amsat-bb] Antenna Polarization
> I've been meaning to setup some antennas for satellite operation for
> awhile here. And since I will probably end up doing it this
> fall/winder I had a question I was wondering about, before I get the
> antennas completely built connected up.
>
> I plan on using a circular polarized antenna, for lhcr and rhcr.
> Since this setup has two coax that your switch a 1/4wave (if I
> remember right) to either side to create the two rotations in the
> antenna.
>
> Is there a way I can modify this to feed two radios? so one radio
> would receive lhcr, and the other rhcr? Or would I be forced to use
> two antennas to do this?
>
> The only idea I have is to use a signal splitter on each of the two
> antenna halfs before joining them, then join each of those splits into
> the cr parts. But I'm not sure if there is a better way to do this
> without as much loss, or if this might cause a backfeed that would
> defeat the me from getting any signal at all.
>
> Maybe there is a good writeup of this on the web somewhere, but I have
> no clue what the proper terms to google it are, and haven't had any
> luck.
>
> Thanks.
>
Hi Patrick
What you propose to do is possible in theory but you need four 3 dB
power dividers with characteristic impedance of 36 ohm each and 14
N/m male connectors so that the total losses of the system are too high.
I suggest to switch from RHCP to LHCP over the same receiver using
only a coax relay as described in all antenna books of the ARRL or into
"The Satellite Experimenter's Handbook by Martin Davidoff K2UBC
edited by the ARRL
73" de
i8CVS Domenico
------------------------------
Message: 3
Date: Fri, 25 Sep 2009 03:44:12 -0700
From: "Jeff Yanko" <wb3jfs@xxx.xxx>
Subject: [amsat-bb] OT: CQWW RTTY
To: <amsat-bb@xxxxx.xxx>
Message-ID: <127BFF03F6514D789CB0E01E17D0436A@xxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi all,
I have an OT question about this weekends CQWW RTTY contest. Does one in
the US send the 599 03 (Zone) or 599 NV (State) as the exchange? I was
reading the rules and I'm a bit confused. Here is what's written:
EXCHANGE: RST plus zone (e.g., 59905). US and VE stations also send US
state or VE area.
Looking forward to the replies!
73,
Jeff WB3JFS
------------------------------
Message: 4
Date: Fri, 25 Sep 2009 21:05:49 +1000
From: "Andrew Rich" <vk4tec@xxxxxxxxxxxxx.xxx>
Subject: [amsat-bb] Sat status
To: <amsat-bb@xxxxx.xxx>
Message-ID: <E120FD8A8D444BCE82CF935E5A327845@xxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
http://vk4tec.no-ip.org/sat_status/
Working well, capturing ISS PCSAT AO-51
With manual entries as well
Cheers
----------------------------------------------------------
Andrew Rich
Airways Technical Officer Grade 4
Surveillance - RADAR ADS-B
Amateur Radio Callsign VK4TEC
email: vk4tec@xxxxxxxxxxxxx.xxx
web: www.tech-software.net
------------------------------
Message: 5
Date: Fri, 25 Sep 2009 07:16:28 -0400
From: "Stephen E. Belter" <seb@xxxxxx.xxx>
Subject: [amsat-bb] Re: New Board
To: Clint Bradford <clintbradford@xxx.xxx>
Cc: "AMSAT-BB \(amsat-bb@xxxxx.xxxxxx <amsat-bb@xxxxx.xxx>
Message-ID:
<51668A33220E754EABE6583357ECEE2D33DE5483@xxxxxxxx.xxxxxx.xxxxx>
Content-Type: text/plain; charset="us-ascii"
Clint,
I've had the pleasure and privilege to personally meet all of the new board
members except Bill at either Dayton or at the Symposium in San Francisco.
In my opinion, all of them (including Bill), are super individuals.
I am *very* pleased that they have volunteered their time and efforts on our
behalf. My sincere thanks to each of them.
73, Steve N9IP
--
Steve Belter
seb@xxxxxx.xxx
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Clint Bradford
> Sent: Friday, September 25, 2009 2:17 AM
> To: AMSAT BB
> Subject: [amsat-bb] New Board
>
> Didn't see much excitement about the recent election results here. But
> you should know we're in capable hands with the following board
> members in place:
>
> Barry Baines, WD4ASW
> Drew Glasbrenner, KO4MA
> Bill Ress, N6GHZ
> Alan Biddle, WA4SCA
> Tony Monteiro, AA2TX (first alternate)
>
> In my humble opinion, we're in good hands. These gentlemen should be
> commended for stepping up and committing themselves (well,
> "committing" could be interpreted as a psychiatric term ... ) to the
> cause of promoting AMSAT.
>
> Clint Bradford, K6LCS
> http://www.work-sat.com
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Fri, 25 Sep 2009 07:13:18 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: New Board
To: "'Clint Bradford'" <clintbradford@xxx.xxx>
Cc: 'AMSAT-BB' <amsat-bb@xxxxx.xxx>
Message-ID: <352DA9921AC54D9991F4916262B55D13@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Clint,
As the FNG, I can say I have been awed by the old timers' dedication,
experience, competence, and especially the just plain hard work which
happens behind the scenes. We live in interesting times, in the sense of
the Chinese curse, and I firmly believe that we as an organization will take
advantage of that. The outlines of the future are at least becoming
clearer, if not in all cases the details. See everybody at the symposium.
Alan
WA4SCA
PS I asked, and they tell me I can't have a recount. ;)
------------------------------
Message: 7
Date: Fri, 25 Sep 2009 14:24:17 +0200
From: "Mike Rupprecht" <mail@xxxxxxxxxxxxxx.xx>
Subject: [amsat-bb] SwissCube telemetry
To: <amsat-bb@xxxxx.xxx>
Message-ID: <009801ca3ddb$1a238cb0$4e6aa610$@xx>
Content-Type: text/plain; charset="iso-8859-1"
All,
11:06 UTC CW and 1k2 BPSK active , 250 packets decoded
hb9eg/1
1 0 3
2 323 325
3 301001 37
Error flags:
EPS: OK
COM: OK
CDMS: OK
ADCS: OK
Payload: OK
Power states:
COM: On
Beacon: On
CDMS: Off
ADCS: Off
Payload: Off
ADS: Off
Battery 1 voltage: 4.12 V
Battery 2 voltage: 4.16 V
Produced current:
-X: [375;500[ mA
+X: [0;125[ mA
-Y: [125;250[ mA
+Y: [0;125[ mA
-Z: [0;125[ mA
+Z: [125;250[ mA
Battery 1 temperature: -4?C
1k2 packets e.g.:
2009-09-25 12:15:41.410 UTC: [72 Bytes KISS Frame (without CRC)]
ctrl: 3 PID: F0 {UI} 49 Payload Bytes
from HB9EG1-1 to HB9EG1:
1 > 08 8C 47 00 08 08 C0 BB 00 0D 10 01 01 00 02 E1 DE 00 18 08
21 > C0 27 41 8E 08 08 C0 BD 00 0D 10 01 07 00 02 E1 DE 00 18 08
41 > C0 27 8A 3A B0 00 2E 1D E8
__________________________________________________________________
2009-09-25 12:15:43.550 UTC: [274 Bytes KISS Frame (without CRC)]
ctrl: 3 PID: F0 {UI} 254 Payload Bytes
from HB9EG1-1 to HB9EG1:
1 > 38 8D 1A 00 08 08 C0 BC 00 EE 10 03 19 00 02 CC 04 00 62 FF
21 > FE 05 FA FB 05 02 04 05 F8 02 05 00 00 0A 00 00 0B 07 09 08
41 > FE 07 0A 02 01 0F 04 05 0F 0B 0C 09 03 0A 0E 03 03 11 08 09
61 > 13 0E 0F 0A 07 0D 12 05 05 14 0C 0E 17 10 11 0B 0C 10 14 07
81 > 06 16 0F 11 1A 12 12 0C 0F 12 16 09 08 18 11 14 1C 14 14 0D
101 > 11 13 18 0B 0B 17 0F 15 1B 12 13 0D 0F 12 16 0C 0C 15 0D 14
121 > 19 10 12 0D 0D 11 15 0D 0D 08 07 11 11 05 06 01 08 06 08 0C
141 > 0C FF 00 0A 07 FE FF F8 01 FF FF 0A 0A F8 F8 04 00 F8 F8 F2
161 > FA F8 F8 08 08 F3 F3 FE FA F2 F3 EF F4 F3 F3 05 05 EE EE F9
181 > F4 ED EE EB EE ED EE 02 02 E9 E8 F3 EF E9 EA E9 E9 E9 E9 00
201 > 00 E5 E4 EF EB E5 E5 E6 E5 E5 E5 FC FC ED E5 EC ED EC EE EF
221 > E4 EB ED FC FC F5 EA EE F5 F3 F5 F8 E9 F2 F5 FC FC FC F0 F2
241 > FA F9 FB 00 EE F8 FB B3 13 B0 00 2E 1D F1
See here: http://www.dk3wn.info/p/?p=8439
73, Mike
DK3WN
------------------------------
Message: 8
Date: Fri, 25 Sep 2009 10:53:05 -0300
From: Bruce Robertson <ve9qrp@xxxxx.xxx>
Subject: [amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE
To: Jeff Yanko <wb3jfs@xxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<49657a760909250653l117c9f0aj9793868a99086f8a@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Jeff --
I really appreciate you doing this research for us. Two additional
ideas come to mind:
1. Those of us with FT-817s could configure its two RF ports to use
different bands and connect the rig directly to the beam's antenna
connectors, bypassing the duplexer. For this purpose, higher-quality
bnc terminated cable would be useful.
2. If I'm correct, your replacement duplexer is rather larger than the
one it is replacing. It would be a great topic for a Journal article
if someone with the necessary equipment and expertise were to design a
replacement with less loss.
73, Bruce
VE9QRP
On Fri, Sep 25, 2009 at 6:10 AM, Jeff Yanko <wb3jfs@xxx.xxx> wrote:
> Hi all,
>
> A quick update to my new project to improving the Arrow antenna, efficiency
> wise. ?I wanted to see how well it would perform on gaining and losing
> access during AOS and LOS. ?AO-27 is not a good choice since the timer is
> turned on when it is well above the AOS horizon and it is switched off
> before it reaches its LOS horizon. ?That leaves a dependable AO-51 to test
> it out.
>
> With the last setup, the OEM diplexer provided by Arrow Antenna, I would
> copy AO-51 about 3 minutes after AOS and lose it about 3 to 4 minutes before
> LOS. ?Not bad, but people were saying they worked the birds when they were 1
> degree off of the horizon. ?I have some pine trees that could be an issue
> but they are spaced far enough apart that I can work between them and I also
> have to deal with the McCollough Range to the SSE of me here in Las Vegas,
> NV. ?Today, there were 2 passes of AO-51, one at 12 degrees elevation, the
> other at 74 degrees. ?During both passes, I began to copy the downlink about
> a 1.25 minute after AOS. ?A considerable difference from 3 minutes. ?The
> downlink also improved down to about minute before LOS. ?On the last pass I
> worked KG6NUB at 0124z and LOS was 0125z and my downlink sounded fairly
> good, though I was fighting desense. ?(That's another issue I need to
> resolve.) ?Also, on both passes, I never once lost the downlink. ?No
> dropouts or fades. ?I'm still amazed.
>
> Another issue I came across was how wide the beamwidth is of the Arrow
> Antenna between the Arrow diplexer and the new diplexer. ?I was wondering if
> this was going to happen and it did. ?The reason that this happened was with
> the old diplexer, the signal attenuated so much that you had to be pointed
> right smack dab on the bird, a few degrees off and you lost the signal.
> Now, with the new diplexer, you can point the beam in the general direction
> and still copy the bird. ?In most cases I had to turn the beam 90 degrees
> before I completely lost the downlink! ?Twisting the antenna to make
> polarization changes makes absolutely no difference now. ?This also
> attributes to the fact that now I'm copying the entire pass without dropouts
> or fades. ?Makes sense. ?What I've regained over the lossy diplexer makes up
> for any polarization differences, etc. for a better copiable signal.
>
> Next weekend I will have to try more passes and get a feel of how much this
> system has changed.
>
>
> 73,
>
> Jeff ?WB3JFS
> Las Vegas, NV
> DM26
>
>
>
>
>
>
> _______________________________________________
> 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: Fri, 25 Sep 2009 10:27:02 -0400
From: Martha <martha@xxxxx.xxx>
Subject: [amsat-bb] Only Two Weeks Away
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID:
<956751cf0909250727m391ecb1fy83acffd7770f61e7@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
The 2009 AMSAT Symposium and Annual Meeting is only two weeks away. If you
haven't registered on-line, please do so as soon as possible. All the
information can be found on our website. I need to give the hotel a count
for attendees so that they can set up the meeting rooms. In addition, we
need to give the caterer a count for dinner. It's our 40th Anniversary -
that's something to celebrate!
--
73- Martha
------------------------------
Message: 10
Date: Fri, 25 Sep 2009 15:09:43 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] All Satellites
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <4ABCDD37.3020806@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
Here's a list of all (known to me) satellites still in orbit with some
designed in (but not necessarily operational)
amateur band functionality.
For those that think nothing has been happening recently, there have been 26
(so far) satellites launched this year, 13
in 2008 and 11 in 2007. Thats 50 birds in less than the past 3 years.
Catalog Number Common Name International Designator Comments
1293 OSCAR 3 1965-016F
6236 OSCAR 6 1972-082B
7530 OSCAR 7 1974-089B
10703 OSCAR 8 1978-026B
14129 OSCAR 10 1983-058B
14781 OSCAR 11 (UoSAT 2) 1984-021B
16909 JAS 1 (FUJI 1) 1986-061B
20437 OSCAR 14 (UoSAT 3) 1990-005B
20438 OSCAR 15 (UoSAT 4) 1990-005C
20439 OSCAR 16 (PACSAT) 1990-005D
20440 OSCAR 17 (DOVE) 1990-005E
20441 OSCAR 18 (WEBERSAT) 1990-005F
20442 OSCAR 19 (LUSAT) 1990-005G
20480 JAS 1B (FUJI 2) 1990-013C
21039 SL-12 R/B(1) 1990-116B
21087 INFORMATOR 1 1991-006A
21089 COSMOS 2123 1991-007A
21575 OSCAR 22 (UoSAT 5) 1991-050B
22825 KITSAT B 1993-061C
22826 POSAT 1 1993-061D
22828 ITAMSAT 1993-061F
22829 EYESAT A 1993-061G
23439 RADIO ROSTO 1994-085A
24278 JAS 2 1996-046B
24305 UNAMSAT 1996-052B
25396 TMSAT 1998-043C
25397 TECHSAT 1B 1998-043D
25509 SEDSAT 1 1998-061B
25520 PAN SAT 1998-064B
25544 ISS (ZARYA) 1998-067A
25636 SUNSAT 1999-008C
25693 OSCAR 36 (UoSAT 12) 1999-021A
25756 KITSAT 3 1999-029A
26063 OPAL 2000-004C
26545 SAUDISAT 1A 2000-057A
26548 TIUNGSAT 1 2000-057D
26609 AMSAT OSCAR 40 2000-072B
26931 PCSAT 2001-043C
26932 SAPPHIRE 2001-043D
27605 RUBIN 2 2002-058A
27607 SAUDISAT 1C 2002-058C
27842 DTUSAT 2003-031C
27844 CUTE-1 2003-031E
27845 QUAKESAT 2003-031F
27847 CANX-1 2003-031H
27848 CUBESAT XI-IV 2003-031J
27939 MOZHAYETS 4 2003-042A
28375 AMSAT ECHO 2004-025K
28650 HAMSAT 2005-017B
28890 BEIJING 1 (TSINGHUA) 2005-043A
28891 TOPSAT 2005-043B
28892 UWE-1 2005-043C
28893 SINAH 1 2005-043D
28894 SSETI-EXPRESS 2005-043E
28895 CUBESAT XI-V 2005-043F
28897 SSETI-EXPRESS DEB 2005-043H
28898 MOZ.5/SAFIR/RUBIN 5/SL-8 2005-043G
28941 CUTE 1.7 2006-005C
29252 GENESIS 1 2006-029A
29479 HINODE (SOLAR B) 2006-041A
29655 GENESAT 2006-058C
29712 PEHUENSAT 1 2007-001D
31117 EGYPTSAT 1 2007-012A
31122 CSTB 1 2007-012F
31126 MAST 2007-012K
31128 LIBERTAD 1 2007-012M
31129 CP3 2007-012N
31130 CAPE 1 2007-012P
31132 CP4 2007-012Q
31135 AGILE 2007-013A
31140 NFIRE 2007-014A
31789 GENESIS 2 2007-028A
32781 GIOVE-B 2008-020A
32783 CARTOSAT 2A 2008-021A
32784 CANX-6 2008-021B
32785 CUTE 1.7 & AOD 2 2008-021C
32786 IMS-1 2008-021D
32787 COMPASS 1 2008-021E
32788 AAUSAT CUBESAT 2 2008-021F
32789 DELFI C3 2008-021G
32790 CANX-2 2008-021H
32791 SEEDS 2008-021J
32792 RUBIN 8/PSLV 2008-021K
32794 AMOS 3 2008-022A
32953 YUBILEINY 2008-025A
33492 GOSAT (IBUKI) 2009-002A
33493 PRISM (HITOMI) 2009-002B
33494 SPRITE-SAT (RISING) 2009-002C
33495 KAGAYAKI 2009-002D
33496 SOHLA-1 (MAIDO-1) 2009-002E
33498 STARS (KUKAI) 2009-002G
33499 KKS-1 (KISEKI) 2009-002H
33595 EXPRESS AM-44 2009-007A
34808 ANUSAT 2009-019B
34941 PROTOSTAR 2 2009-027A
35002 PHARMASAT 2009-028B
35003 HAWKSAT 1 2009-028C
35004 CP6 2009-028D
35005 AEROCUBE 3 2009-028E
35008 MERIDIAN 2 2009-029A
35690 DRAGONSAT 2009-038B
35693 ANDE POLLUX SPHERE 2009-038E
35694 ANDE CASTOR SPHERE 2009-038F
35866 OBJECT B 2009-049B
35867 FREGAT/IRIS 2009-049C
35868 OBJECT D 2009-049D
35869 OBJECT E 2009-049E
35870 SUMBANDILA 2009-049F
35871 BLITS 2009-049G
35931 OCEANSAT 2 2009-051A
35932 OBJECT B 2009-051B
35933 OBJECT C 2009-051C
35934 OBJECT D 2009-051D
35935 OBJECT E 2009-051E
35936 RUBIN 9.1/RUBIN 9.2/PSLV 2009-051F
--
Nigel A. Gunn, 1865 El Camino Drive, Xenia, OH 45385-1115, USA. tel +1 937
825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF), e-mail nigel@xxxxx.xxx www
http://www.ngunn.net
Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pigs QRP
Club International #385,
Dayton ARA #2128, AMSAT-NA LM-1691, AMSAT-UK 0182, MKARS, ALC,
GCARES, XWARN.
------------------------------
Message: 11
Date: Fri, 25 Sep 2009 09:20:14 -0600
From: James Duffey <jamesduffey@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE
To: Bruce Robertson <ve9qrp@xxxxx.xxx>
Cc: James Duffey <jamesduffey@xxxxxxx.xxx>, AMSAT-BB
<amsat-bb@xxxxx.xxx>
Message-ID: <BC99BA47-68D0-4DC9-9136-407758BE617A@xxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
On Sep 25, 2009, at 7:53 AM, Bruce Robertson wrote:
>
> 2. If I'm correct, your replacement duplexer is rather larger than the
> one it is replacing. It would be a great topic for a Journal article
> if someone with the necessary equipment and expertise were to design a
> replacement with less loss.
There is a diplexer that is easy to make and has good performance in
this article:
< http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf >
As a bonus you get details on how to build your own handheld antenna
for LEO Satellites. - Duffey
------------------------------
_______________________________________________
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 4, Issue 496
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