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1994-11-13
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23KB
Date: Tue, 12 Apr 94 04:30:35 PDT
From: Ham-Space Mailing List and Newsgroup <ham-space@ucsd.edu>
Errors-To: Ham-Space-Errors@UCSD.Edu
Reply-To: Ham-Space@UCSD.Edu
Precedence: Bulk
Subject: Ham-Space Digest V94 #88
To: Ham-Space
Ham-Space Digest Tue, 12 Apr 94 Volume 94 : Issue 88
Today's Topics:
* SpaceNews 11-Apr-94 *
2 Line ElSets
Building Sat antennas (2 msgs)
Eprom 27C512 with access time of 120 ns
Meteosat/APT Trans. Sked
Oscar Antennas ??
SAREX Keps 4/11/94 at 8:00 UTC
Two-Line Orbital Element Set: Space Shuttle
Send Replies or notes for publication to: <Ham-Space@UCSD.Edu>
Send subscription requests to: <Ham-Space-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Space Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-space".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: Mon, 11 Apr 1994 10:05:43 MDT
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!europa.eng.gtefsd.com!MathWorks.Com!yeshua.marcam.com!zip.eecs.umich.edu!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!alberta!ve6mgs!usenet@network.UCSD
Subject: * SpaceNews 11-Apr-94 *
To: ham-space@ucsd.edu
SB NEWS @ AMSAT $SPC0411
* SpaceNews 11-Apr-94 *
BID: $SPC0411
=========
SpaceNews
=========
MONDAY APRIL 11, 1994
SpaceNews originates at KD2BD in Wall Township, New Jersey, USA. It is
published every week and is made available for unlimited distribution.
* NEW AO-13 SCHEDULE *
======================
Magnetorquing from attitude 180/0 to 230/-5 commenced on Apr 04 [Fri] 1810
UTC, orbit 4446/224, and continued for 8 perigees. The new schedule
commenced on orbit 4452 MA 145 Apr 07 [Thu] 1120 UTC.
*** AO-13 TRANSPONDER SCHEDULE *** 1994 Apr 07-Jul 11
Mode-B : MA 0 to MA 170 |
Mode-BS : MA 170 to MA 218 |
Mode-S : MA 218 to MA 220 |<- S beacon only
Mode-S : MA 220 to MA 230 |<- S transponder; B trsp. is OFF
Mode-BS : MA 230 to MA 250 | Alon/Alat 230/-5
Mode-B : MA 250 to MA 256 |
Omnis : MA 250 to MA 120 | Move to attitude 180/0, Jul 11
NEW ATTITUDE - Note: The mean attitude for the period 1994 Apr 07-Jul 11
will be ALON/ALAT 230/0. This is an Alon 10 degrees "better" than
originally proposed. It is achieved at the expense of a 10 degree "worse"
Sun angle, which will will now reach 40 degrees (77% illumination)
May 30-Jul 11. During that period the Mode-B transponder *might* have to
be OFF from MA 250-80 to conserve battery power.
Please don't rely on gossip and rumour! Continuous up to date information
about AO-13 operations is always available on the beacons, 145.812 MHz or
2400.664 MHz in CW, RTTY and 400 bps PSK. These bulletins are also posted
to Internet, ANS, Packet, PacSats etc, and many international newsletters.
A 400 bps PSK decoder is available from G3RUH and several DSP products;
display software P3C.EXE etc from many AMSAT groups.
The active command stations are listed below, and constructive feedback
about operations is always welcome.
Peter DB2OS @ DB0FAU.#NDS.DEU.EU
James G3RUH @ GB7DDX.#22.GBR.EU
Graham VK5AGR @ VK5WI.#ADL.#SA.AUS.OC
The above may also be reached via Internet (callsign@amsat.org) and KO-23.
Please remember to state clearly a return address.
Notes prepared on behalf of, and in total cooperation with the above by:
James Miller G3RUH @ GB7DDX.#22.GBR.EU 1994 Apr 04 [Mon] 0600 UTC
* AMSAT NET VIA SATELLITE *
===========================
Bruce Paige, KB5ZRV, is the AMSAT Area Coordinator in Houston, Texas. Bruce
runs a local AMSAT net that meets on the 147.100 MHz repeater every Tuesday
evening at 10:00 PM local Central Time. The net is rebroadcast over the
Galaxy 3 satellite, Transponder 17 on a 5.8 MHz subcarrier.
This net is then received live and retransmitted by repeater operators
in Toronto, Canada, Anchorage, Alaska (3 repeaters), New England States
(6 repeaters), Ontario, CA, Lawton, OK, Indianapolis, IN, Fargo, ND. It
has also been heard in Hawaii and other states.
The net has a telephone number for those that would like to ask questions
of the net or check in. There are beginners segments that lasts 3-5
minutes, and explain how satellite novices can work various satellites,
describes different types of station equipment necessary to work satellites,
and other topics that beginners find useful in getting started in satellite
operations. SAREX operating techniques have also been covered.
This net re-broadcast is free for the taking by those with TVRO ground
stations. The people who run the net are having a great time and have
found many people are listening in that do not have AMSAT nets in their
local areas.
Any comments can be directed to Bruce via the Internet at kb5zrv@amsat.org.
* FO-20 SCHEDULE *
==================
The FO-20 command station announced that FO-20 will be placed in Mode JA
(Analog transponder mode) during Field Day 1994 (25-Jun-94 18:00 UTC through
26-Jun-94 18:00 UTC).
The current operating schedule is as follows:
Analog mode:
06-Apr-94 06:45 -to- 13-Apr-94 07:10 UTC
20-Apr-94 07:35 -to- 27-Apr-94 07:55 UTC
11-May-94 06:54 -to- 18-May-94 07:20 UTC
Digital mode:
Unless otherwise noted above.
[Info via Kazu Sakamoto, JJ1WTK]
* FUJI AWARD INFORMATION *
==========================
Kazu Sakamoto, JJ1WTK, reports that a "Fuji" award is available to users
of the FO-20 satellite. Applicants should have confirmed CW or SSB contacts
with 10 different amateur stations through the FO-20 Amateur Satellite. A
fee of 8 IRCs or US $4 will be charged per award. An additional 2 IRCs will
be charged for air mail delivery regardless of the number of the awards
claimed. If QSL cards are submitted, sufficient funds for return postage
will also be required.
Correspondence should be sent to:
Japan Amateur Radio League -- Award Desk
1-14-2 Sugamo, Toshima, Tokyo 170, Japan
* SpaceNews BBS UPDATE *
========================
The SpaceNews packet radio BBS sponsored by Mario, KD6ILO, reported in last
week's issue of SpaceNews has changed frequency. It can now be found
operating on 145.050 MHz. The latest issue of SpaceNews, as well as other
AMSAT and satellite-related news and information can be found on this BBS.
The BBS is also linked to the UoSAT-OSCAR-22 satellite through the N7RSN
SatGate also located in Tacoma, WA.
* THANKS! *
===========
Thanks to all those who sent messages of appreciation to SpaceNews,
especially:
K2UVG VE3OZL W4AT ZR5JRS VE7AHX
* FEEDBACK/INPUT WELCOMED *
===========================
Mail to SpaceNews should be directed to the editor (John, KD2BD) via any
of the following paths:
FAX : 1-908-747-7107
PACKET : KD2BD @ N2KZH.NJ.USA.NA
INTERNET : kd2bd@ka2qhd.ocpt.ccur.com -or- kd2bd@amsat.org
MAIL : John A. Magliacane, KD2BD
Department of Engineering and Technology
Advanced Technology Center
Brookdale Community College
Lincroft, New Jersey 07738
U.S.A.
<<=- SpaceNews: The first amateur newsletter read in space! -=>>
/EX
--
John A. Magliacane, KD2BD * /\/\ * Voice : 1-908-224-2948
Advanced Technology Center |/\/\/\| Packet : KD2BD @ N2KZH.NJ.USA.NA
Brookdale Community College |\/\/\/| Internet: kd2bd@ka2qhd.ocpt.ccur.com
Lincroft, NJ 07738 * \/\/ * Morse : -.- -.. ..--- -... -..
------------------------------
Date: 11 Apr 94 19:56:56 GMT
From: hp-cv!hp-pcd!hpcvsnz!charlier@hplabs.hp.com
Subject: 2 Line ElSets
To: ham-space@ucsd.edu
leeannmyk@aol.COM wrote:
: Hello, My name is Mike Johnson. I am looking for a source for
: USSPACECMD/NORAD type 2 line element sets for a varity of vehicles (primarily
: 16609).
: Any help in finding this (these) source(s) would be greatly appreciated.
: I can also be contacted at johnsonm@Rush.aps.rl.af.mil
No need to look any further. They are posted on a regular basis to
this very notes group, with titles like:
ORBS$098.2L.AMSAT
In fact here's the Mir data from a recent set:
Mir
1 16609U 86017 A 94090.25081547 0.00008348 11343-3 0 5496
2 16609 51.6462 216.9197 0015558 91.3363 268.9434 15.58441517493803
--
Charlie Panek KX7L Hewlett Packard Company
charlier@lsid.hp.com Lake Stevens Instrument Division
Everett, Washington
------------------------------
Date: 11 Apr 1994 14:40:09 GMT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!usenet.ins.cwru.edu!eff!news.kei.com!newsstand.cit.cornell.edu!newsstand.cit.cornell.edu!usenet@network.ucsd.edu
Subject: Building Sat antennas
To: ham-space@ucsd.edu
In article <Cnyq2s.80@ncifcrf.gov> Joe Mack, mack@ncifcrf.gov writes:
>Get the ARRL &/or RSGB antenna handbooks. THe calculations for a helix
are
>trivial. They are wideband and non-critical in dimensions, unlike a
yagi.
>
Yeah, that is a very nice feature of them. Mine kept falling over tripod
and all when I first put it up (hey, I'm an EE, not an ME :-) and all the
dings
and bends didn't seem to faze it.
As for the calculations - my suggestion would be to put the formulas into
a spreadsheet so you can diddle the values and see what you come up with.
That is what I did and it was very handy in finally converging on a
working
design.
> However people don;t build them at 2m very often - they are more
>often used at UHF . I don't really know why but here are some guesses
>
> A 2m helix is large and hard to support (rods out from the center
>pole to the helix are long).
That is one important reason - they get fairly unweildy. After my
success with my 420-450 helix, I looked into doing one for 2 but
gave it up because of the size.
I think the other big reason is it's not as efficient an antenna for
the boom length. My 14 turn helix is 10 foot long and has about 15
db of gain. You can get the same gain smaller and lighter in a yagi
arrangement - but they are much trickier to adjust and have much
smaller usable bandwidth.
>
> It isn't 50 ohms. Itsa bout 140ohms and there are tricks to make
>it 50ohms but these are narrow band (still wide band by ham band
standards)
>and a little tricky to get going.
Go with the radial feed method (instead of coming into the center to
feed, you
squish the last turn into half the space, fatten the conductor to about 5
times the regular size (I used copper flashing) and feed it off the
center where
the turn comes down to the ground plane. On mine it easily handles the
band from
420 to 450. I use the same antenna for Oscar, ATV, SSB and FM.
>
> Maybe you can make more money by selling a yagi than a helix.
>
> It would beinteresting to find out the real reason, but most people
>if they want a fair bit of gain at 2m and 432 and want circular
polarisation
>they use crossed beams 1/4lambda apart
I think that is mostly the size vs gain issues. Helix'es are simple,
cheap,
forgiving, fun and work well. But they aren't the smallest antenna on the
block.
73 de Kevin, WB2EMS
"Coffee, that elixir which makes life possible before noon. "
------------------------------
Date: Mon, 11 Apr 1994 15:40:30 GMT
From: ihnp4.ucsd.edu!swrinde!emory!wa4mei!ke4zv!gary@network.ucsd.edu
Subject: Building Sat antennas
To: ham-space@ucsd.edu
In article <JAY.17.2DA57809@medicine.dmed.iupui.edu> JAY@medicine.dmed.iupui.edu (Jay Sissom) writes:
>I am new to satelite communications. (This is just a warning!)
>
>I would like to build a 2m & a 70cm beam for use with satelites. Does anyone
>know of an article in QST or some other plan for such antennas?
>From what I understand, a normal 2m or 70cm beam antenna would work, but a
>circular polorization would be much better. I have no idea how one would
>build a circular polorized antenna.
Circular polarized crossed yagis are fairly simple to build. There are
a couple of ways to get circular polarization with them. The way KLM
does it is to space one of the antennas 1/4-wave further up the boom
than the other and then combine the two antennas with a simple matching
harness (two 1/4-wave 75 ohm cables to a Tee fitting). Or you can take
the Cushcraft path and mount the two antennas' elements at the same
points on the boom and combine them as above, but with an additional
1/4-wave length of 50 ohm cable in one leg to get the required 90 degree
phase shift.
There are other forms of circularly polarized antennas. A couple are
the helix (both axial and quadrafilar) and the Lindenblad. You can also
use disc or loop yagis with crossed dipole driven elements. These are more
common at S band.
A nice simple antenna for S band can be constructed of all thread rod
for the boom, fender washers for parasitic elements, and a bunch of jam
nuts to hold everything in place. The crossed dipole driven elements can
be made from a piece of printed circuit board (duroid) with the driven
elements and their phasing and matching harnesses etched onto the board
and held in place with nylon jam nuts. The whole thing will fit in a piece
of PVC or fiberglass tubing for weatherproofing, or you can just cover the
driven elements and reflector with pipe and let the rest hang out in the
breeze after a cold galvanize spray. (You could use circuit board for
all the elements, but that much duroid board gets expensive.)
(You can use a short bolt, a drill, and a file to size the OD of the
parasitic element washers. Just put the washer on the bolt with jam
nuts, chuck it in the drill, and file to size.)
Gary
--
Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems | we break it. | uunet!rsiatl!ke4zv!gary
534 Shannon Way | Guaranteed! | emory!kd4nc!ke4zv!gary
Lawrenceville, GA 30244 | |
------------------------------
Date: Mon, 11 Apr 1994 13:32:59 GMT
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!torn!news.unb.ca!upei.ca!UPEI.CA!seeler@network.ucsd.edu
Subject: Eprom 27C512 with access time of 120 ns
To: ham-space@ucsd.edu
I was wondering if anyone knew of a Canadian or US distributer or supplier
for the following two items which are being considered for the Trakbox
hardware upgrade:
1. 27C512 Eprom (Dip package) with 120 nanosecond access time.
2. Dallas Semiconductor microprocessor DS80C320
Any suggestions as to names or numbers would be greatly appreciated.
73 de David Seeler,
VY2DCS
Internet: seeler@upei.ca
------------------------------
Date: Mon, 11 Apr 94 14:10:40 CDT
From: ihnp4.ucsd.edu!agate!msuinfo!netnews.upenn.edu!iat.holonet.net!vulcan!n4nr@network.ucsd.edu
Subject: Meteosat/APT Trans. Sked
To: ham-space@ucsd.edu
I am looking for an up to date Meteosat 3 /APT Transmission schedule.
Would really appreciate a copy....Thanks!
--
Dennis T. Dease internet - n4nr@vulcan.com (or n4nr@amsat.org)
Pelham, Alabama, USA packet radio - n4nr@kd4cim.al.usa.na
------------------------------
Date: Mon, 11 Apr 1994 15:42:50 GMT
From: ihnp4.ucsd.edu!swrinde!emory!wa4mei!ke4zv!gary@network.ucsd.edu
Subject: Oscar Antennas ??
To: ham-space@ucsd.edu
In article <T36Jkc2w165w@barf80.nshore.org> wb8k@barf80.nshore.org (Dennis jakubisin) writes:
>What the latest gossip concerning what good & what isn't on Oscar yagi's
>for mode B & J.. KLM, M sqrd etc. Any comments?? The old Cushcraft AOP 1
>pkg I have been using for a few years rally barks, especially in wet
>weather.
You noticed that too, huh? :-)
I use the KLM-22C and the 40CX for my station. Clean patterns, good
gain, and they hold up really well.
Gary
--
Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems | we break it. | uunet!rsiatl!ke4zv!gary
534 Shannon Way | Guaranteed! | emory!kd4nc!ke4zv!gary
Lawrenceville, GA 30244 | |
------------------------------
Date: Mon, 11 Apr 1994 02:17:31 -0600
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!news.intercon.com!panix!zip.eecs.umich.edu!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!alberta!ve6mgs!usenet@network.ucsd.edu
Subject: SAREX Keps 4/11/94 at 8:00 UTC
To: ham-space@ucsd.edu
SB SAREX @ AMSAT $STS-59.010
SAREX Keps Update 4/11 at 8:00 UTC
Greenbelt, MD, 4/11/94 at 8:00 UTC
The official SAREX element set for this morning will be GSFC-005. This
element sent was generated by Ron Parise, WA4SIR, of the Goddard Space
Flight Center. Gil Carman, WA5NOM, reports that the predictions using
GSFC-005 are closer to the real-time Orbiter state vector than GSFC-007 or
JSC-009.
STS-59
1 23042U 94020A 94 99.70643805 0.00018312 11043-4 10773-4 0 58
2 23042 56.9974 262.7245 0009489 267.3550 92.6453 16.20229092 67
Satellite: STS-59
Catalog number: 23042
Epoch time: 94099.70643805 (09 APR 94 16:57:16.25 UTC)
Element set: GSFC-005
Inclination: 56.9974 deg
RA of node: 262.7245 deg Space Shuttle Flight STS-59
Eccentricity: 0.0009489 Keplerian Elements
Arg of perigee: 267.3550 deg
Mean anomaly: 92.6453 deg
Mean motion: 16.20229092 rev/day Semi-major Axis: 6597.0622 Km
Decay rate: 0.18E-03 rev/day*2 Apogee Alt: 224.93 Km
Epoch rev: 5 Perigee Alt: 212.41 Km
NOTE - This element set is based on NORAD element set # 005.
The spacecraft has been propagated to the next ascending
node, and the orbit number has been adjusted to bring it
into agreement with the NASA numbering convention.
Submitted by Frank H. Bauer, KA3HDO for the SAREX Working Group
/EX
------------------------------
Date: 11 Apr 94 23:36:12 GMT
From: agate!howland.reston.ans.net!paladin.american.edu!zombie.ncsc.mil!blackbird.afit.af.mil!tkelso@ucbvax.berkeley.edu
Subject: Two-Line Orbital Element Set: Space Shuttle
To: ham-space@ucsd.edu
The most current orbital elements from the NORAD two-line element sets are
carried on the Celestial BBS, (513) *253-9767*, and are updated daily (when
possible). Documentation and tracking software are also available on this
system. As a service to the satellite user community, the most current
elements for the current shuttle mission are provided below. The Celestial
BBS may be accessed 24 hours/day at 300, 1200, 2400, 4800, or 9600 bps using
8 data bits, 1 stop bit, no parity.
Element sets (also updated daily), shuttle elements, and some documentation
and software are also available via anonymous ftp from archive.afit.af.mil
(129.92.1.66) in the directory pub/space.
STS 59
1 23042U 94020A 94101.25000000 .00017734 11042-4 10466-4 0 118
2 23042 56.9964 255.2840 0011421 290.8126 76.0752 16.20196288 296
--
Dr TS Kelso Assistant Professor of Space Operations
tkelso@afit.af.mil Air Force Institute of Technology
------------------------------
Date: Mon, 11 Apr 1994 14:15:30 GMT
From: telesoft!garym@uunet.uu.net
To: ham-space@ucsd.edu
References <STS-59.94098.748@alsys.com>, <STS-59.94100.261@alsys.com>, <STS-59.94100.508@alsys.com>
Reply-To : elements-request@alsys.com
Subject : STS-59 Element Set (94101.310)
STS-59
1 23042U 94020A 94101.31051560 +.00017734 11042-4 10466-4 0 112
2 23042 56.9964 254.9922 0011420 290.9416 69.0451 16.20198854 317
Satellite: STS-59
Catalog number: 23042
Epoch time: 94101.31051560 (11 APR 94 07:27:08.55 UTC)
Element set: GSFC-011
Inclination: 56.9964 deg
RA of node: 254.9922 deg Space Shuttle Flight STS-59
Eccentricity: 0.0011420 Keplerian Elements
Arg of perigee: 290.9416 deg
Mean anomaly: 69.0451 deg
Mean motion: 16.20198854 rev/day Semi-major Axis: 6597.1443 Km
Decay rate: 0.18E-03 rev/day*2 Apogee Alt: 226.29 Km
Epoch rev: 31 Perigee Alt: 211.22 Km
(for Shuttle Elements subscription info, email: listserv@alsys.com)
--
Gary Morris Internet: elements-request@alsys.com
KK6YB Packet: KK6YB @ N0ARY.#NOCAL.CA.USA.NA
San Diego, CA, USA Phone: +1 619-457-2700 x128
------------------------------
Date: 11 Apr 94 16:30:36 GMT
From: telesoft!garym@uunet.uu.net
To: ham-space@ucsd.edu
References <STS-59.94098.748@alsys.com>, <STS-59.94100.508@alsys.com>, <STS-59.94101.310@alsys.com>
Reply-To : elements-request@alsys.com
Subject : STS-59 Element Set (94101.619)
STS-59
1 23042U 94020A 94101.61900344 +.00018288 11044-4 10712-4 0 120
2 23042 56.9946 253.5022 0010718 289.2110 70.7819 16.20252631 360
Satellite: STS-59
Catalog number: 23042
Epoch time: 94101.61900344 (11 APR 94 14:51:21.90 UTC)
Element set: GSFC-012
Inclination: 56.9946 deg
RA of node: 253.5022 deg Space Shuttle Flight STS-59
Eccentricity: 0.0010718 Keplerian Elements
Arg of perigee: 289.2110 deg
Mean anomaly: 70.7819 deg
Mean motion: 16.20252631 rev/day Semi-major Axis: 6596.9983 Km
Decay rate: 0.18E-03 rev/day*2 Apogee Alt: 225.68 Km
Epoch rev: 36 Perigee Alt: 211.54 Km
(for Shuttle Elements subscription info, email: listserv@alsys.com)
--
Gary Morris Internet: elements-request@alsys.com
KK6YB Packet: KK6YB @ N0ARY.#NOCAL.CA.USA.NA
San Diego, CA, USA Phone: +1 619-457-2700 x128
------------------------------
End of Ham-Space Digest V94 #88
******************************