Date: Tue, 19 Apr 94 04:30:30 PDT From: Ham-Space Mailing List and Newsgroup Errors-To: Ham-Space-Errors@UCSD.Edu Reply-To: Ham-Space@UCSD.Edu Precedence: Bulk Subject: Ham-Space Digest V94 #98 To: Ham-Space Ham-Space Digest Tue, 19 Apr 94 Volume 94 : Issue 98 Today's Topics: ANS-106 Bulletins APT-Satellites: Report APR 16, 1994 Point me to the FAQ please... SAREX element set 4/14/94 at 0:40 UTC SAREX Keps 4/14 at 0:40 UTC satellite Satellite Receive Dishes Combined in Phase Array (2 msgs) STS-59 mission extended STS-59 Orbital State Vector Rev #151 STS-59 Orbital State Vectors Rev #89 Send Replies or notes for publication to: Send subscription requests to: 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: Sun, 17 Apr 1994 17:08:33 -0600 From: ihnp4.ucsd.edu!library.ucla.edu!psgrain!nntp.cs.ubc.ca!alberta!ve6mgs!usenet@network.ucsd.edu Subject: ANS-106 Bulletins To: ham-space@ucsd.edu SB SAT @ AMSAT $ANS-106.01 GARC LANDLINE BBS OPENS HR AMSAT NEWS SERVICE BULLETIN 106.01 FROM AMSAT HQ SILVER SPRING, MD APRIL 16, 1994 TO ALL RADIO AMATEURS BT BID: $ANS-106.01 Goddard Amateur Radio Club (GARC) Landline BBS Operations Begin The NASA Goddard Amateur Radio Club (GARC), Inc. in Greenbelt, MD has been working behind the scenes on projects that may benefit all amateur radio operators in general and perhaps AMSAT members in particular. Ron Parise (WA4SIR) has been "beta" testing a Bulletin Board System (BBS) which is accessible via the INTERNET through telnet and ftp (file transfer protocol), a telephone modem, and packet radio (locally on 145.090 MHz and non-locally through "packet wormholes"). With Ron's heavy STS-67 crew training as of late, Jim Blackwell (N3KWU) is picking up much of the work to complete the "beta" testing phase. The BBS contains keplerian orbital elements updated daily, AMSAT bulletins, SAREX bulletins, club member mail service, club announcements, space shuttle mission infor-mation and lots more. Access via Internet: wa3nan.gsfc.nasa.gov or 128.183.105.17 via landline: 301-286-4137 via packet: WA3NAN on 145.090 MHz in Washington, DC area Additionally, the Goddard Amateur Radio Club has a home page for public viewing on the GARC World Wide Web server. It contains the latest GARC Newsletter in electronic form, latest space shuttle keps, GARC calendar of events, details of upcoming club activities, current WA3NAN QSL card, club facility-repeater-BBS info, a morse code experiment and more. WWW access URL: http://macgwy-mac2.gsfc.nasa.gov/garc/wa3nan-home-page.html The GARC Web server was developed and is maintained by club president Jim Blackwell (N3KWU) (n3kwu@amsat.org). All radio amateurs are invited to check out its potential. This medium is the hottest item on the INTERNET today. [The AMSAT News Service (ANS) would like to thank WD8LAQ for this bulletin item. WD8LAG can be reached at his INTERNET address of wd8laq@amsat.org.] /EX SB SAT @ AMSAT $ANS-106.02 AMSAT PBBS CHANGES FREQUENCY HR AMSAT NEWS SERVICE BULLETIN 106.02 FROM AMSAT HQ SILVER SPRING, MD APRIL 16, 1994 TO ALL RADIO AMATEURS BT BID: $ANS-106.02 AMSAT PBBS Changing Frequency 15-APR-1994 The AMSAT PBBS will be changing frequency and modes starting 15-APR-1994 at 16:00 UTC. The AMSAT PBBS will be on a "Mark" freqeuncy of 14.079 MHz, that is 14.181.1 MHz AFSK LSB using the mode Pactor with the callsign WT0N. The new schedule will be as follows: Monday through Saturday from 16:00 UTC until 23:00 UTC on a "Mark" frequency of 14.079 MHz. From 23:30 UTC until 04:00 UTC on a "Mark" freqeuncy of 7.073.5 MHz, that is 7.075.6 MHz AFSK LSB, using the Mode Pactor. These changes have been made to better serve AMSAT users with improved coverage and the use of a mode that many of the users have expressed an interest in. If anyone would like to use the Mode G-TOR, please let W0TN and he will see about setting up a schedule for G-TOR users. Please send any comments or suggestions to one of the following addresses: INTERNET: BJARTS@STTHOMAS.EDU PACKET: WT0N@WB0GDB.#STP.MN.USA.NOAM PACTOR: WT0N The AMSAT PBBS will have updated Keps and AMSAT BULLETINS, along with SpaceNews and other satellite related items. [The AMSAT News Service would like to thank B.J. Arts (WT0N) for this bulletin item.] /EX SB SAT @ AMSAT $ANS-106.03 AO-13 OPS NET SCHEDULE HR AMSAT NEWS SERVICE BULLETIN 106.03 FROM AMSAT HQ SILVER SPRING, MD APRIL 16, 1994 TO ALL RADIO AMATEURS BT BID: $ANS-106.03 Current AMSAT Operations Net Schedule For AO-13 AMSAT Operations Nets are planned for the following times. Mode-B Nets are conducted on AO-13 on a downlink frequency of 145.950 MHz. If, at the start of the OPS Net, the frequency of 145.950 MHz is being used for a QSO, OPS Net enthusiasts are asked to move to the alternate frequency of 145.955 MHz. Date UTC Mode Phs NCS Alt NCS 18-Apr-94 0100 B 188 W5IU WA5ZIB 23-Apr-94 1800 B 180 VE2LVC W9ODI 30-Apr-94 2130 B 176 W9ODI VE2LVC 09-May-94 0000 B 175 W5IU WA5ZIB 14-May-94 1700 B 167 WA5ZIB W5IU 21-May-94 2130 B 185 VE2LVC W9ODI Any stations with information on current events would be most welcomed. Also, those interested in discussing technical issues or who have questions about any particular aspect of OSCAR statellite operations, are encouraged to join the OPS Nets. If neither of the Net Control Stations show up, any participant is invited to act as the NCS. Slow Scanners are invited to join the SSTV sessions on AO-13. The freq- uency is 145.955 MHz. The net meets at 45 minutes before Mode S, and on Mode B following Mode S on Saturdays and Sundays. Join those sessions or convey your wishes for other SSTV skeds to wb6llo@amsat.org, and he will coordinate your efforts. /EX SB SAT @ AMSAT $ANS-106.04 WEEKLY OSCAR STATUS REPORTS HR AMSAT NEWS SERVICE BULLETIN 106.04 FROM AMSAT HQ SILVER SPRING, MD APRIL 16, 1994 TO ALL RADIO AMATEURS BT BID: $ANS-106.04 Weekly OSCAR Status Reports: 16-APR-94 AO-13: Current Transponder Operating Schedule: M QST *** 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 | Blon/Blat 230/-5 Mode-B : MA 250 to MA 256 | Omnis : MA 250 to MA 120 | Move to attitude 180/0, Jul 11 [G3RUH/DB2OS/VK5AGR] FO-20: The following is the current schedule for transponder operations: ANALOG MODE: 20-Apr-94 7:35 -to- 27-Apr-94 7:55 UTC 11-May-94 6:54 -to- 18-May-94 7:20 UTC Digital mode: Unless otherwise noted above. [Kazu Sakamoto (JJ1WTK) qga02014@niftyserve.or.jp] STS-59: To obtain a QSL, either as a result of a SWL or for a QSL, send your report or QSL to ARRL EAD, STS-59 QSL, 225 Main Street, Newington, CT 06111, USA. Include the following information in your QSL or report: STS-59, date, time in UTC, frequency and mode (FM voice or packet). In addit-ion, you must also include an SASE (or sufficient IRCs) using a large, business-sized envelope if you wish to receive a card. The Orange Park Amateur Radio Club in Florida has generously volunteered to manage the cards for this mission. [Bob Inderbitzen (NQ1R) Assistant to the Manager, ARRL Educational Activities] KO-23: Working well and has a new pair of images. [WH6I] KO-25: Working well. A number of new images can be found on KO-25 but since the wide angle images are in a new format that so far has not been decoded, and since narrow angle images are very hard to locate in the absence of the companion wide angle image there is very little to get out of the images that are available. [WH6I] AO-16: Working well. WH6I notes that usage on the 1200 baud OSCARS has has dropped off considerably. [WH6I] LO-19: Working well. [WH6I] The AMSAT NEWS Service (ANS) is looking for volunteers to contribute weekly OSCAR status reports. If you have a favorite OSCAR which you work on a regular basis and would like to contribute to this bulletin, please send your observations to WD0HHU at his CompuServe address of 70524,2272, on INTERNET at wd0hhu@amsat.org, or to his local packet BBS in the Denver, CO area, WD0HHU @ W0LJF.#NECO.CO.USA.NOAM. Also, if you find that the current set of orbital elements are not generating the correct AOS/LOS times at your QTH, PLEASE INCLUDE THAT INFORMATION AS WELL. The information you provide will be of value to all OSCAR enthusiasts. /EX ------------------------------ Date: Mon, 18 Apr 1994 15:09:27 GMT From: yale.edu!nigel.msen.com!zib-berlin.de!uni-paderborn.de!urmel.informatik.rwth-aachen.de!gmd.de!NewsWatcher!user@yale.arpa Subject: APT-Satellites: Report APR 16, 1994 To: ham-space@ucsd.edu Observed at station 50.7 NLat, 7.1 ELon, APR 16, 1994 NOAA-9: APT 137.62 On NOAA-10: APT 137.50 *OFF* NOAA-11: APT 137.62 On NOAA-12: APT 137.50 On Meteor 3-5: APT 137.85 On NOAA-10 is near NOAA-12. Thus NOAA-10 APT is OFF to avoid interference caused by two visible transmitters using the same frequency. (VHF-conflict) +------------------------------------------+ |Peter Henne (peter.henne@gmd.de) | | (henne@gmd.de) | |German Nat.Research Center.f.Comp.Science | |D-53754 St.AUGUSTIN, Germany | +------------------------------------------+ ------------------------------ Date: 19 Apr 1994 01:56:57 GMT From: ncar!hsdndev!dartvax.dartmouth.edu!usenet@ames.arpa Subject: Point me to the FAQ please... To: ham-space@ucsd.edu Can someone point me to the FAQ for amateur satellites? I don't seem to see it here or in rec.radio.info. I figure it is the best place to start. Also, if anyone knows of other net or hard copy resources that could get someone interested in getting into low power/low expense casual satellite activity (who is currently fairly clueless about it all), I would be very interested. Thanks in advance... --- ======================================================================= Kenneth E. Harker N1PVB Dartmouth College Amateur Packet Radio kenneth.e.harker@dartmouth.edu Hinman Box 1262 n1pvb@w1et.nh.usa.na (603) 643-5716 Hanover, NH 03755 or n1pvb-5 on 144.99 ======================================================================= (PGP Public Key now available on request) ------------------------------ Date: 15 Apr 94 02:27:20 GMT From: agate!howland.reston.ans.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!library.ucla.edu!news.ucdavis.edu!csus.edu!netcom.com!marcbg@ucbvax.berkeley.edu Subject: SAREX element set 4/14/94 at 0:40 UTC To: ham-space@ucsd.edu Greenbelt, MD, 4/14/94 at 0:40 UTC The official SAREX element set at this time is GSFC-016. This element set was generated by Ron Parise, WA4SIR, of the Goddard Space Flight Center. Gil Carman, WA5NOM, reports that the predictions using GSFC-016 were 6 seconds earlier than GSFC-014 as of 15:00 UTC on 4/13. STS-59 1 23042U 94020A 94103.28423883 0.00019321 11073-4 10308-4 0 169 2 23042 56.9943 245.4685 0009256 288.8199 71.1887 16.21374060 631 Satellite: STS-59 Catalog number: 23042 Epoch time: 94103.28423883 (13 APR 94 06:49:18.24 UTC) Element set: GSFC-016 Inclination: 56.9943 deg RA of node: 245.4685 deg Space Shuttle Flight STS-59 Eccentricity: 0.0009256 Keplerian Elements Arg of perigee: 288.8199 deg Mean anomaly: 71.1887 deg Mean motion: 16.21374060 rev/day Semi-major Axis: 6593.9561 Km Decay rate: 0.19E-03 rev/day*2 Apogee Alt: 221.67 Km Epoch rev: 63 Perigee Alt: 209.46 Km NOTE: This element set is based on NORAD element set # 016. 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 -- Marc Grant Voice Mail: 214-246-1150 home: marcbg@netcom.com work: marcbg@esy.com Amateur Radio N5MEI ------------------------------ Date: 14 Apr 94 00:52:52 GMT From: agate!howland.reston.ans.net!gatech!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!alberta!ve6mgs!usenet@ucbvax.berkeley.edu Subject: SAREX Keps 4/14 at 0:40 UTC To: ham-space@ucsd.edu SB SAREX @ AMSAT $STS-59.017 SAREX Keps 4/14 at 0:40 UTC Greenbelt, MD, 4/14/94 at 0:40 UTC The official SAREX element set at this time is GSFC-016. This element set was generated by Ron Parise, WA4SIR, of the Goddard Space Flight Center. Gil Carman, WA5NOM, reports that the predictions using GSFC-016 were 6 seconds earlier than GSFC-014 as of 15:00 UTC on 4/13. STS-59 1 23042U 94020A 94103.28423883 0.00019321 11073-4 10308-4 0 169 2 23042 56.9943 245.4685 0009256 288.8199 71.1887 16.21374060 631 Satellite: STS-59 Catalog number: 23042 Epoch time: 94103.28423883 (13 APR 94 06:49:18.24 UTC) Element set: GSFC-016 Inclination: 56.9943 deg RA of node: 245.4685 deg Space Shuttle Flight STS-59 Eccentricity: 0.0009256 Keplerian Elements Arg of perigee: 288.8199 deg Mean anomaly: 71.1887 deg Mean motion: 16.21374060 rev/day Semi-major Axis: 6593.9561 Km Decay rate: 0.19E-03 rev/day*2 Apogee Alt: 221.67 Km Epoch rev: 63 Perigee Alt: 209.46 Km NOTE - This element set is based on NORAD element set # 016. 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: 18 Apr 94 22:56:29 GMT From: agate!cat.cis.Brown.EDU!noc.near.net!news.delphi.com!serapions@ucbvax.berkeley.edu Subject: satellite To: ham-space@ucsd.edu Hello, My name is Paul and recently I have been reading a great book about satellites. The following is information that was covered in the first chapters. A magnetic torquer is basically a rod with a coil wrapped around it. The direction of current into the coil can be changed. Torquers are used to counteract the earths magnetic field, as well as residual forces of the spacecraft. A magnetic dipole moment is produced when the coil is energized, defined as: dipole moment = pole strength X distance between poles A nutation damper is a tube partially filled with mercury and mounted on the spacecraft deck. It is a viscous damper, which damps out "nutation", ( a "wobbly axis"). During the Hubble telescope repair, we heard a lot about Magnetometers. These are devices which measure the strength of a magnetic field, and also its direction. In its simplist form it is a solenoid coil with a ferromagnetic core. As it passes through the earths magnetic field a proportional output curreroduced. Tracking refers to following, and plotting the path of an object. Telemetry, refers to the process of obtaining samples of data from various sensors and then transmitting the data to an earth station. The data from the sensors is first encoded and then modulated onto an RF carrier. The modulated carrier is transmitted to earth. A sensor measures some parameter such as radiation, temperature, pressure, or speed (RPM), and changes it into an electrical signal, which can be processed by a computer. Time division multiplexing or frequency division multiplexing are used to place all of the "telemetry data" on a single carrier. Does anyone know the bandwidth requirement for telemetry (esp. PCM)? Please leave a reply or contact "Paul" via Internet, my address is: Serapions@delphi.com ------------------------------ Date: Mon, 18 Apr 1994 14:25:17 GMT From: ihnp4.ucsd.edu!swrinde!sgiblab!darwin.sura.net!fconvx.ncifcrf.gov!mack@network.ucsd.edu Subject: Satellite Receive Dishes Combined in Phase Array To: ham-space@ucsd.edu In article <2osk75INN7mv@uwm.edu> weening@convex.csd.uwm.edu (Richard W Weening) writes: > >Is anyone aware of successful methods for combining two or more satellite receive dishes >in phase array as a means of achieving receive gain comparable to a single >larger dish? Is there a Usenet Group concerned with the engineering aspects >of satellite broadcasting and receive technology? Thanks COmbinng antennas into arrays is covered in most texts on antennas. You will have to do it at receive frequency and feed the power to a combiner. The pointing accuracy needed will be approx that for an antenna with the diam= spacing between the two dishes (ie you'll need to be very accurate), while the signal will only go up 3bd. This is great for radia astronomy where you want to know exactly where your source is. However you just want more signal, in which case it will be easier to buy a bigger dish. Joe Mack NA3T mack@ncifcrf.gov ------------------------------ Date: Mon, 18 Apr 1994 12:56:06 GMT From: galaxy.ucr.edu!library.ucla.edu!europa.eng.gtefsd.com!news.umbc.edu!eff!news.kei.com!yeshua.marcam.com!zip.eecs.umich.edu!newsxfer.itd.umich.edu!news1.oakland.edu!rcsuna@ihnp4.ucsd.edu Subject: Satellite Receive Dishes Combined in Phase Array To: ham-space@ucsd.edu In <2osk75INN7mv@uwm.edu>, weening@convex.csd.uwm.edu (Richard W Weening) writes: > >Is anyone aware of successful methods for combining two or more satellite receive dishes >in phase array as a means of achieving receive gain comparable to a single >larger dish? ^^^^ I've always seen phased antenna arrays used for more precise pointing, not for increased gain. Of course, with a narrower "beam" you GET more gain, so maybe it isn't as unusual an idea as it first seemed.... ======== Alan Anderson (Wb9RUF) [no fancy .sig -- yet] ------------------------------ Date: Mon, 18 Apr 1994 12:49:40 GMT From: netcomsv!netcom.com!marcbg@decwrl.dec.com Subject: STS-59 mission extended To: ham-space@ucsd.edu Greenbelt, MD, 4/17/94 at 15:40 UTC The STS-59 mission has been extended by one day. Landing is now set for 15:53 UTC on Tuesday April 19. This extension day provides an additional day of SAREX operations for those interested in making a SAREX contact. The official SAREX element set for today is still JSC-021. This element set was generated by Gil Carman, WA5NOM, of the Johnson Space Flight Center. STS-59 1 23042U 94020A 94105.62622017 .00203357 11079-4 10947-3 0 213 2 23042 56.9933 234.1397 0007233 279.9940 80.0358 16.22652200 1014 Satellite: STS-59 Catalog number: 23042 Epoch time: 94105.62622017 = (15 APR 94 15:01:45.42 UTC) Element set: 021 Inclination: 56.9933 deg RA of node: 234.1397 deg Space Shuttle Flight STS-59 Eccentricity: .0007233 Keplerian Element set JSC-021 Arg of perigee: 279.9940 deg from NASA flight Day 7 vector Mean anomaly: 80.0358 deg Mean motion: 16.22652200 rev/day G. L. Carman Decay rate: 2.03357e-03 rev/day^2 NASA Johnson Space Center Epoch rev: 101 Checksum: 271 Submitted by Frank H. Bauer, KA3HDO for the SAREX Working Group -- Marc Grant Voice Mail: 214-246-1150 home: marcbg@netcom.com work: marcbg@esy.com Amateur Radio N5MEI ------------------------------ Date: Mon, 18 Apr 1994 21:52:48 GMT From: ihnp4.ucsd.edu!galaxy.ucr.edu!library.ucla.edu!csulb.edu!csus.edu!netcom.com!astroman@network.ucsd.edu Subject: STS-59 Orbital State Vector Rev #151 To: ham-space@ucsd.edu Vector format = 117 Satellite Name: STS-59 Catalog Number: 23042 94020A Epoch Date/Time: 94108.75165878472 04/18/1994 18:02:23.319 UTC EFG E: 11352359.29 ft F: 3215735.26 ft G: -18105476.33 ft Edot: -5497.5132 ft/s Fdot: 24012.4114 ft/s Gdot: 827.8732 ft/s ndot/2 (drag): 0.00250000000 rev/day^2 nddt/6: 1.11000E-05 rev/day^3 Bstar: 8.99829E-05 1/Earth Radii Elset #: 31 Rev @ Epoch: 151.75621515941 MSDOS/PC software is available for conversion of OSV to 2 Line Keplerian Elements via ftp to: oak.oakland.edu:/pub/msdos/hamradio/v2l9331.zip and the SIMTEL archives. State Vectors courtesy Ken Ernandes N2WWD SM ------------------------------ Date: 15 Apr 94 02:40:39 GMT From: agate!howland.reston.ans.net!europa.eng.gtefsd.com!library.ucla.edu!news.ucdavis.edu!csus.edu!netcom.com!astroman@ucbvax.berkeley.edu Subject: STS-59 Orbital State Vectors Rev #89 To: ham-space@ucsd.edu Vector format = 1017 Satellite Name: STS-59 Catalog Number: 23042 94020A Epoch Date/Time: 94104.89669105324 04/14/1994 21:31:14.106 UTC ECI X: 2019155.471079 ft M50 Y: -15215137.202542 ft Z: 15222360.072138 ft Xdot: 18017.01562 ft/s Ydot: 13922.94141 ft/s Zdot: 11514.48438 ft/s ndot/2 (drag): 0.01482654578 rev/day^2 nddt/6: 0.00000E+00 rev/day^3 Bstar: 6.11363E-04 1/Earth Radii Elset #: 19 Rev @ Epoch: 89.15892374393 MSDOS/PC software is available for conversion of OSV to 2 Line Keplerian Elements via ftp to: oak.oakland.edu:/pub/msdos/hamradio/v2l9331.zip and the SIMTEL archives. State Vectors courtesy Ken Ernandes N2WWD SM ------------------------------ Date: 18 Apr 94 16:47:13 GMT From: telesoft!garym@uunet.uu.net To: ham-space@ucsd.edu References , , Reply-To : elements-request@alsys.com Subject : STS-59 Element Set (94108.643) STS-59 1 23042U 94020A 94108.64356620 .00203357 11079-4 10947-3 0 223 2 23042 56.9938 219.5250 0008385 295.2758 64.7483 16.24015035 1504 Satellite: STS-59 Catalog number: 23042 Epoch time: 94108.64356620 = (18 APR 94 15:26:44.11 UTC) Element set: 022 Inclination: 56.9938 deg RA of node: 219.5250 deg Space Shuttle Flight STS-59 Eccentricity: .0008385 Keplerian Element set JSC-022 Arg of perigee: 295.2758 deg from NASA flight Day 10 vector Mean anomaly: 64.7483 deg Mean motion: 16.24015035 rev/day G. L. Carman Decay rate: 2.03357e-03 rev/day^2 NASA Johnson Space Center Epoch rev: 150 (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 #98 ******************************