November 8-10, 1991 - Klofas.com

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ADSAT - The Astronaut Deployable Satellite By Robert Summers, N7DGC, William Clapp, KB7KCM, and Verne Hansen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 SUNSAT - A Joint University of Stellenbosch - SA AMSAT Satellite Project Due for Launch in 1994 By Hans Van de Groenendaal, ZS6AKV . . . . . . . .. . . . . . . . . . . 169 Image-Enabling Your Satellite Station By Jeff Wallach, PhD, N51TU .......................... 173 SEDSAT 1 - 1991 Status Report By Dennis R. Wingo, KD4ETA, Cheryl D. Bankston, and John Champa, K80CL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 AM SAT / ARRL Educational Workshop Uses of Amateur Satellites in Engineering Courses By Walter K. Daniel and Robert E. Bruninga, WB4APR ........ 193 SAREX - A Post Flight Report from Two School Sessions By Tom Daniels, N3CXP .............................. 196 Uses of Amateur Radio Satellites in Education By Freddy de Guchteneire, ON6UG ..................... 204 A Space Shuttle Experiment with Radio Waves at Audio Frequencies By Jim Ericson, KG6EK .............................. 209 Bringing Space into the Classroom By Joe Kasser, W3/G3ZCZ ........................... 216 Chaminade MicroSat Project By Dave Reeves, KF6PJ, et al . . . . . . . . . . . . . . . . . . . . . . . ... 234 Using Amateur Satellite and Weather Fax Systems in Secondary and University Classes By Robert J. Twiggs and Dr. K.R. Reister, N7MXF ........... 244 The Use of Satellites in Furthering Tertiary Electrical Engineering Education By JHN Van de Groenendaal, ZS6AKV ................... 249 Space Education and the SEDSAT 1 Project By Dennis R. Wingo, KD4ET A, and Cheryl D. Bankston ....... 254
MOTION AND COLOR VIDEO VIA THE PHASE 3D SATELUTE: REPLACING ATV WITH ADV A STATUS REPORT John Champa, K80CL AMSAT-NA Detroit Spacecraft Lab 7800 Hartwell Street Dearborn, M148126-1122 (313) 584-2842 Todd Maxwell Compression Labs, Inc. 26911 Northwestern Highway, Suite 300 Southfield, MI 48048 As part of the developmental planning to construct the AMSAT Phase 3DSatellite, an VIDEO COMPRESSION advanced communications OSCAR in high earth orbit, there has been discussion regard. ing provisioning of a hard limiting wideband· Analog AudiO width digital transponder, generally with the and Video capability of handling traffic in the range of 56·64 Kbps, or even higher speeds. Digital In this paperwe'll discuss the possibilities Audio of using an Amateur digital video (ADV) and Video communications system based on a coder / I 90Mb 90Mb decoder (codec) device installed in a high speed 80386 PC. Such a configuration could Fig. 1 be used to digitize the motion video output from a standard baseband video (NTSC) source, such as a home video camera or VCR for a digital transmission uplink to the Phase 3D Satellite. This PC based codec could also take an incoming digital video motion signal from a downlink receiver and convert it to an analog video motion signal for display on an appropriate monitor. Using data compression techniques such as vector quantization, the digitized motion video can be taken from it's uncompressed digital form of approximately 92 Mbps down to 56 Kbps or less for more efficient transmission (see Fig. 1) between ground stations and the satellite. Current techniques, even at this tremendous compression ratio, provide acceptable color contrast and image resolution, with moderate motion compensation capability. Technological developments in digital video compression over the pastfew years have resulted in a steady decline in digital bandwidth requirements and equipment cost, while the motion image quality level has improved dramatically (see Fig. 2). We are now quickly approaching the development stage where a PC based codec system for digital video transmission and reception will start to come within range of the more advanced Amateur television and satellite operators within the next several years, and certainly long before the launch of the Phase 3D Satellite, now tentatively scheduled for 1995. 1
Page 1 and 2: $12.00 RADIO AMATEUR SATELLITE COR
Page 3 and 4: Copyright @ 1991 by The American Ra
Page 5: Table of Contents AMSAT-NA Ninth Sp
Page 9 and 10: etc. with digital video broadcasts,
Page 11 and 12: would allow far more users to be ac
Page 13 and 14: THB PROJECT A minimal mission will
Page 15 and 16: As to transponder frequency, either
Page 17 and 18: A SIMULATOR FOR PACSAT~l DOWNLINK T
Page 19 and 20: FILE SERVER TRAFFIC STATISTICS The
Page 21 and 22: In addition to supplying the simula
Page 23 and 24: Table 5 Results of Initial Simulat
Page 25 and 26: about evenly divided. The only valu
Page 27 and 28: lations assume the same user traffi
Page 29 and 30: AN AMATEUR SPACE EXPLORATION GROUN
Page 31 and 32: themselves seem to be in good condi
Page 33 and 34: mechanism as well as aiming the dis
Page 35 and 36: WHAT'S UP WITH WEBERSAT by Stephen
Page 37 and 38: As shown in FIGURE 2, the satellite
Page 39 and 40: L-Band Video Uplink Webersat's 1.26
Page 41 and 42: cost, Charged coupled Device (CCO)
Page 43 and 44: Level Cantral Meter Mode (Peak I Av
Page 45 and 46: of valid photo attempts have occurr
Page 47 and 48: BIBLIOGRAPHY "CCD Cameras: Digital
Page 49 and 50: FIGURE 3 THE SUN PICTURE TAKEN JU
Page 51 and 52: Studies by DJ4ZC showed that the so
Page 53 and 54: Fig 1--Phase IV, the AMSAT-NA geost
Page 55: Fig 5--Seven sided Marburg configur
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Gateways to the 21 st Century Joe
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Gateways to the 21st Century Figure
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Gateways to the 21st Century Table
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· Gateways to the 21st Century Int
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Gateways to the 21st Century S11m m
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Telemetry: Past, Present and Futur
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Telemetry :- Past Present and Futur
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Te1emeuy :- Past Present and Future
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Telemetry:- Past Present and Future
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ORBIT SELECTION CONSIDERATIONS FOR
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elements that will be slowly pertur
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""'/ = 7/ '71,.. '3 W= 27iJ~ FIGURE
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Higher M/N values correspond to low
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TABLE 2 ORBITAL ELEMENTS MIN =3/2
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,~, ECHO 319 ms ,,~, FRQ 2400.0000
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FIGURE 15 FIGURE 16 ....> "430 FIGU
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several days until the apogee drift
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The argument of perigee has an effe
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P3DorbiIs AO-13 long-tenn predictio
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PRELIMINARY DECISION OF THE PHASE..
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eceive filtering is not necessary.
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While modern technology has brought
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VITA Operations Using UOSAT-3 by Er
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Performance of ground stations in t
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The equipment was then inventoried
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But we cannot do it alone. VITA is
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80386SX -type computer Table II. E
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November (cont..) 6. Ghana 7. Niger
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A RADIO ASTRONOMY EXPERIMENT FOR PH
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antenna at all, or with the aerospa
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where m represents the mass of the
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than the transmitted signal. The se
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are of course the familiar Doppler
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ESTIMATING ORBITAL PERIOD The Doppl
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CONCLUSIONS Since their inception i
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SOLAR SAIL EXPEDITION TO THE MOON A
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LAUNCH CONFIGURATION The launch -co
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Propulsion Module Spacecraft Bus P
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packet techniques to guarantee virt
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ADSAT THE ASTRONAUT DEPLOYABLE SAT
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in January of 1990. The satellite c
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For satellite reception to be made
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A final significant experiment to b
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FUTURE PROGRAMS Building a satellit
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SUNSAT - A JOINT UNIVERSITY OF STEL
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The power system is conventional. T
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IMAGE-ENABLING YOUR SATELLITE STATI
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chip to provide an 8 bit. (256 leve
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can be done a m:inimal expense thro
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available once again from D RIG B B
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Fig. 2. HRPT image of Florida taken
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.... co w Fig. 6. Soviet 0 kean 2 A
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Jileng Tun I-B. 28 January 1991, 08
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SEDSAT 1 Overview SEDSAT 1 is a mic
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tested on the mode A transponder is
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Foreword We're pleased to publish,
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spacecraft and receiving telemetry.
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SAREX.-A POST FLIGHT REPORT FROM TW
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oth the students and the public ali
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I posted a notice on packet about o
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o o the dropouts could hopefully be
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Amsat - NA Technical Symposium and
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We can compare an amateur radio sat
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Let me wish you all a very fruitful
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descending whistler tones appeared
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that uses the electrical energy to
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USING THE RECEIVER Even though hig
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Bringing Space into the Classroom
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Bringing Space into the Classroom d
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Bringing Space into the Classroom R
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Bringing Space into the Classroom (
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Bringing Space into the Classroom F
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Bringing Space into the Classroom o
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Bringing Space into the Classroom a
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· ., '''/ .~. Chaminade MicroSat P
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4. Watch the time on Traksat and mo
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~ o..:c III til ..... ::> 'tI > ..
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SOLAR ECLIPSE OF JULY 11,1991 LUSA
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To start the program type: C:\TRAKS
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Using Amateur satellite and Weather
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packet radio, the educational commu
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the schools. 5. Have this organizat
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ought new experiences into the clas
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The University of Stellenbosch and
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Space Education and the SEDSAT 1 Pr
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SEDSAT 1, Amateur Radio, and a Spac
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Conclusions Some of the goals of th
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November 8-10, 1991 - Klofas.com

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