Source: ftp://ftp.amsat.org/amsat/articles/g3ruh/BIBLIOG Last modified: 2005 Dec 02 [Fri] 1718 utc by JRM SELECTED ARTICLES FROM AMSAT-UK's "OSCAR-NEWS" AND OTHER MAGAZINES by James Miller G3RUH WWW: http://www.jrmiller.demon.co.uk/ [ Articles are from Amsat-UK's Oscar News unless otherwise stated ] Some of the articles have also been converted to HTML format, and are available as indicated. ------------------------------------------------------------------------ Not The Amsat Net 1982 Sep, No.39 p.20 "I dunno where Surrey get their data from, but I think someone takes the orbital calendar and adds on a bit here and there and gives it back to them" - heard on the Amsat 80m Net, Aug 29. This made me rather cross, as G3YAC and I had been measuring doppler shift and computing the keps every weekend for over a year, passing them to UOS (no Nasa data then), and it was accurate to the split second! Discussion. First published piece. ------------------------------------------------------------------------ OSCAR-10 position Calculation Program 1983 Dec, No.45 P.15-18 An original elliptic orbit program which models drag and Antenna Pointing angle. Highly commented, and very clearly coded. Now much revised as PLAN13 (see 1990 Oct) to include solar phenomena, and Eclipses. "Squint" was almost unheard of in '83; first published tracking program to include it. ------------------------------------------------------------------------ OSCAR-10 - Earth Model 1983 Oct No. 44 p.16,21-23 Getting More from Your Model 1984 Jan special p.2-3 Ephemeris Update 1985 1984 Dec No. 50 p.2 Ephemeris Update 1986 1985 Dec No. 56 p.29 Describes how to make a scale model of AO-10 orbit from hardboard, plus a schoolroom globe. Two trivial calculator sums fix the satellite and the Earth's rotation, enabling instant appreciation of what's up. Who needs a computer? (Remember not so many people had them then). ------------------------------------------------------------------------- So you think you Know all about 1983 Dec, No.45 p.14 Circular Polarisation All Screwed Up 1984 Apr, No.46 p.8 Loose Screws 1984 Aug, No.48 p.2 Three light-hearted, related snippets for Summer-time amusement. ------------------------------------------------------------------------ Sun's Up Part 1 1984 Dec, No.50 p.2-6 Sun's Up Part 2 1985 Feb, No.51 p.2-6 Sun's Up Part 3 1985 Apr, No.52 p.8-11 Comprehensive series describing the Sun's orbit, how it's modelled, and its influence on satellite illumination (esp. AO-10), including eclipse prediction. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a112.zip ------------------------------------------------------------------------ FT726R Mod - Variable Sidetone Level. 1985 Feb, No.51 p.19 ------------------------------------------------------------------------ Sensorship - A Question of Attitudes Part 1 1985 Aug, No.54 p.2-8 Sensorship - A Question of Attitudes Part 2 1985 Oct, No.55 p.2-5 Comprehensive series about spacecraft attitude determination, with particular reference to AO-10 Sun and Earth sensors. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a113.zip ----------------------------------------------------------------------- 30.6 Days hath September 1985 Dec, No.56 p.6-9 A discussion of date algorithms for computer programs, with examples. Also: Amsat-DL Journal Jg.14 Nr.4, 1987 Jul/Aug It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a100.zip ------------------------------------------------------------------------ An Oscar-10 Almanac 1986 1985 Dec, No.56 p. 28-29 An Oscar-10 Almanac 1987 1987 Mar No.64 p. 26-27 An Oscar-10 Almanac 1988 1988 Feb No.69 p. 40-41 A week by week explanation of Oscar-10 operations for 1986/7/8. Essential for the serious AO-10 user. Details Argument of perigee, Solar azimuth and elevation, nominal Sun angle, and eclipse durations. Forthcoming attitude changes explained in detail. Smoothed ephemeris for 1986/7/8. ------------------------------------------------------------------------ D.I.Y. OSCAR-10 Attitude Fix 1986 Feb, No.57 p.14-17 A tabular method for telemetry watchers to calculate Oscar-10 attitude from Earth and Sun Sensor data. Follows from "Sensorship..." series. ------------------------------------------------------------------------ 10 Ways To Ensure Failure on Oscar-10 1986 Apr, No.58 p.26-28 Shows in ironic style how every decibel gained counts, and every decibel squandered is a step into the noise. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a101.zip ------------------------------------------------------------------------ Phase 5 Satellites 1986 Apr, No.58 p.29 An original proposal for transponder spectral equalisation using digital electronics (DSP) as a means of solving the "alligator" problem. I hoped it might fly on Phase IV, and hoped the same for P3D.. ;-( It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a102.zip ------------------------------------------------------------------------ OSCAR-10 Smoothed Keplerian Elements 1986 Jul, No. 60 p.3 OSCAR-13 Smoothed Keplerian Elements 1988 Oct, No. 73 p.34-35 NASA keplerian elements are noisy; explains why, and discusses averaging them. Data used by all command stations & flies in AO-13. ------------------------------------------------------------------------ JAS-1 MODE JD - "The Mailbox" 1986 Jul, No. 60 p.30-31 First announcement of availability of highly successful G3RUH 1200 baud FO-12 PSK modem, well before FO-12 launch, and over 12 months before other designs appeared. ------------------------------------------------------------------------ JAS-1/FO-12 Modem Printed Circuit Board 1986 Sep, No. 61 p.19-22 Specification and circuit diagram of 1200 bps PSK modem. A simple but effective squaring loop alternative to the Costas loop. FO-20 PSK Modem Improvement for PacSats 1991 Apr No. 88 p.46-47 Useful mods to counter excessive Microsat phase noise. ------------------------------------------------------------------------ Sun's Keplerian Elements 1987 Mar, No. 64 p.8 Keplerian Elements for Sun and Moon 1987 Dec, No. 68 p.25-26 & 18 Elements for your normal satellite software. Also data for the Moon Second article is in-depth. ------------------------------------------------------------------------ Oscar-13 Mode L Transponder 1988 Oct, No.73 p.36-37 Oscar-13 Mode L Transponder - pt II 1988 Dec, No.74 p.9-11 Oscar-13 Mode L Transponder - pt III 1989 Apr, No.76 p.4 1. In depth discussion of mode-L requirements based on actual experience. 2. Further discussion of mode-L uplink power requirements from calibration tests. Mode L sensitvity study from telemetry analysis. 3. A 6.7metre dish was used to monitor mode-L passband with a spectrum analyser to check for interference. Results. This is the ONLY published quantitative study/analysis of AO-13 mode-L. ------------------------------------------------------------------------ Oscar-13 Attitude and Eclipses 1988/9 1988 Oct, No. 73 p.44 Explains attitude in non-mathematical terms, and when/why it is varied. ------------------------------------------------------------------------ Oscar-13 Command Seminar Aug 1988 1988 Oct, No. 73 p.44 G3RUH makes the big time - officially becomes AO-13 commander - report! ------------------------------------------------------------------------ Oscar-13 Whole Orbit Data 1989 Jun, No. 77 p.3 Defines the format of the WOD data collection blocks on the PSK telemetry ------------------------------------------------------------------------ Planning AO-13 Mode Schedules 1989 Jun, No. 77 p.16-17 Explains in detail the constraints that lead to the schedules. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a104.zip ------------------------------------------------------------------------ Oscar-13 Eclipses by the Moon 1989 Aug, No.78 p.6-7 This happens regularly. Explanations and details of its recent discovery. -------------------------------------------------------------------------- Oscar-13 Memories are made of this 1989 Dec, No.80 p.26-28 Data bits in Oscar-13's memory get corrupted from time to time, yet the program carries on unscathed. Describes how the memory Error Detection and Correction (EDAC) circuits work on AO-13. (See 1994 Aug No. 108) -------------------------------------------------------------------------- Shannon, Coding and the Radio Amateur 1990 Feb No.81 p.11-15 The addition of redundant bits to a data byte achieves an increase data transmission reliability. You send more bits than you started with (and use more bandwidth) so for a fixed transmitter power the intrinsic bit error rate worsens. However the associated error correction schemes more than make up for this apparent penalty. When space communication costs are reckoned in millions of $$$ per db, schemes that provide more bytes for your buck are of the greatest importance. Their use in amateur radio is close. This article is a brief introduction to coding. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a105.zip -------------------------------------------------------------------------- PLAN-13 Satellite Position Calculation Program 1990 Oct No. 85 p.15-25 (See also 1983 Dec) - The basic routines needed for satellite calculations. Includes fundamental equations, explanation and heavily commented listing. Shows how to compute Orbit, MA, mode, range, azimuth, elevation, squint, range rate, doppler shift, height, sub-satellite point, footprint circle, day numbers, dates, Sun's position, solar azimuth, solar elevation, illumination, eclipses, visibility etc etc. Routines widely used by other authors. Booklet available, $10 US. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a111.zip ------------------------------------------------------------------------ 1991, 1992, 1993 ...and all that 1991 Feb No. 87 p 16-17 19xx January is that time of year for the annual pleas by users of ancient software that they've run out of "siderial whatsits". Gives the table until 2000, and shows you how to calculate it. (It's sidereal, by the way). It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a106.zip --------------------------------------------------------------------------- The Shape of Bits To Come 1991 Apr No. 88 p 29-37 This article is about bits, about bandwidth and about control of both. What is the "raised cosine modulation" used on microsats AO-16/18/19? And what is the RSM-8 on Rudak/AO-21? What PSK modulation does Fuji-20 use? Come to that, what is BPSK, and similar abbreviations? Substantial tutorial article, copiously illustrated. Also: Amsat Journal (US) July 1991. Also: ARRL 10th Computer Networking Conference (US), Oct 1991 pps 112-120. Also: Amsat-DL Journal Jg.18 Nr.4, December 1991, Also: Radioaficionados (Spain) Enero 1992. Also: Radio Communication (RSGB) 1993 September & October. Also: SM-Info (Sweden) 1994 Jan - Also: Amsat-OZ (Denmark) 1992 October, No. 8 Also: "Packet: Speed, More Speed and Applications",ARRL 1995. ISBN 0-87259-495-5 It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a108.zip --------------------------------------------------------------------------- Careless Torque 1991 Jun No. 89 p 14-15 Discussion about a routine AO-13 magnetorque which didn't proceed as expected. Error discovered in flight software. --------------------------------------------------------------------------- Small Torque 1991 Aug No. 90 p 26-295 Highly detailed account of an AO-13 magnetorque. --------------------------------------------------------------------------- Oscar-13 Operations 1991 Oct No. 91 p 16-19 Discussion of some of the things an Oscar-13 command station has to do, and has to endure from the public. AO-13 Operations 92Mar16-Jun08 1992 Feb No. 93 p.30-31 And no matter how much you tell 'em, some will always miss what matters, and claim they weren't consulted! Oscar-13 Operations 1992 Aug No. 95 p. 6-7 But undeterred you apparently keep on, even though you wonder if it's really worth it. --------------------------------------------------------------------------- Mode-S - Tomorrow's Downlink. 1992 Oct No. 97 p20-22 Proposes the abandonment of 145 MHz for P3 satellite downlinks, and shows why the logical choice is 2400 MHz. Also: Amsat-DL Journal Dec 1992 Nr4. Jg.19 Also: Amsat Journal (USA) Vol15 No. 5, 1992 Sep/Oct, p.14-15. Also: Amsat-VK Newsletter (VK), No. 90, September 1992 Also: CQ-DL 9/93 1993 September, p.614-617. Also: 73 Amateur Radio Today (USA), Issue #492, 2001 Nov, p.50-51 It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a115.zip --------------------------------------------------------------------------- May the Force be with You, 1992 Dec No.98 p 26-31. Shows how and why AO-13's orbit decays at the end of 1996. Looks at the fine detail of keplerian elements that conventional programs ignore. Extensive subject bibliography. Also: The Amsat Journal (USA) 1993 Jan p16-19. Also: Satellite Operator (USA) No. 27, December 1992. --------------------------------------------------------------------------- Phase 3 400 bps PSK Data Demodulator MK II. 1992 Dec No.98 p39. PCB available from author etc. MK II Decoder specs, ordering, sources, review, MK I mods available on-line from: ftp://ftp.amsat.org/amsat/satinfo/ao13/demod.zip --------------------------------------------------------------------------- Measure AO-13 Squint Directly! 1993 Feb No. 99 p26-28. Shows how to calculate squint angle directly from S-band beacon. The AO-13 S-band antenna is offset from the spin axis, so range oscillates back and forth once per revolution. Hence the beacon warbles a few Hz, proportional to the magnitude of the squint angle. Also: The Amsat Journal (USA) Vol 16 No. 1, January 1993 Also: Amsat-DL Journal (D), Jg. 20, No. 1, March 1993 Also: Amsat-VK Newsletter (VK), No. 94, February 1993 It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a120.zip --------------------------------------------------------------------------- A 60 cm S-Band Dish Antenna. 1993 Apr No.100 p6-10 "Mode-S - Tomorrow's Downlink" proposed the abandonment of the 145 MHz band for weak signal amateur satellite downlinks and sparked off much interest. I explained why S-band (2.4 GHz) is unrivalled on every count as its replacement, and described in outline a tiny 60 cm diameter dish that is entirely adequate for Oscar-13. I received many requests for more details. This antenna is simple and entirely adequate for Oscar-13 reception. Also: The Amsat Journal (USA) Vol 16 No. 2, March/April 1993. Also: Amsat-DL Journal (D), Jg. 20, No. 2, Jun/Aug 1993 Also: Amsat-VK Newsletter No. 97, 1993 April It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a116.zip --------------------------------------------------------------------------- A 16 turn S-band helix antenna 1993 Oct No.103 p20-21 Entitled: Small iS beSteSt Also: Satellite Operator No. 33, June 1993. update ? Also: The Amsat Journal (USA) Vol 16 No.4, Jul/Aug 1993. Update Nov/Dec 93 Also: Amsat-VK Newsletter No. 99, 1993 June, update No. 102, 1993 Oct It is available on-line from as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a117.zip --------------------------------------------------------------------------- Managing Oscar 13 Part 1 1993 Dec No.104 p16-21 Managing Oscar 13 Part 2 1994 Feb No.105 p18-23 Comprehensive discussion of all aspects of the subject. Also: Proceedings of the 11th annual Amsat Space Symposium, Dallas Texas, USA, 1993. 10 pages. Also: Satellite Operator No. 37, October 1993. p46-55 Also: Amsat-VK Newsletter No. 104/5/6/7, 1993 Nov - 1994 Feb Also: The Amsat Journal (USA) Vol 17 No. 1, Jan/Feb 1994 Also: Amsat-DL Journal (D), Jg. 21, No. 2, Jun/Aug 1994 Also: Jamsat Newsletter (JA) 1994 Mar - 1995 May Also: BelAmsat Newsletter (ON) 1994 Dec; reprints of Oscar News and A-DL. It is available on-line from as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a118.zip -------------------------------------------------------------------------- The Earth Moved 1994 Apr No. 106 p8-9 The Earth does not appear to in a fixed position as seen from the Moon. Shows the wander, and discusses the implications for Lunar stations. Also: Amsat-VK Newsletter No. 108, 1994 April pps 7-8 It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a110.zip --------------------------------------------------------------------------- Umbrellas in the Mist 1994 Jun No. 107 p10-11 Measure AO-13 spin rate - become a satellite commander - but don't forget your umbrella! Also: Amsat-VK Newsletter No. 110, 1994 June Also: The Amsat Journal (USA) Vol 17 No. 3, May/Jun 1994 --------------------------------------------------------------------------- Icom's IC-820H, A Satellite User's Perspective 1994 Aug No. 108 p3-7 Review of a satellite "9600 baud data ready" radio - that isn't. Also: Satellite Operator No. 46, July 1994. p1,6-9 It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a103.zip --------------------------------------------------------------------------- Down Memory Lane? 1994 Aug No. 108 p16-19 Discussion of Oscar-13's memory EDAC system, and huge rise in memory error rate that occured on 1994 May 13. Startling conclusion. Also: Amsat-VK Newsletter No. 112, 1994 Aug Also: The Amsat Journal (USA) Vol 17 No. 5, Sep/Oct 1994 It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a107.zip --------------------------------------------------------------------------- The Re-Entry of Oscar-13 1994 Oct No. 109 p 16-20 Without an atmosphere, Oscar-13 would collide with the Earth's crust on 1997 Feb 03. But we do have an atmosphere, which means that the satellite experiences a gradual retardation every perigee pass. Thus re-entry will be sooner, approximately 1996 Dec 16. This paper outlines the computer program and discusses the circumstances. Also: Proceedings of the 12th annual Amsat Space Symposium, Orlando, Florida, USA, 1994. 4 pages. Also: Amsat-DL Journal (D), Jg. 22, No. 1, Mar/May 1995 Also: Jamsat Newsletter (JA) No. 166, 1995 March 25. p1-4 Also: Amsat OZ Journal (OZ) No. 37, 1995 May Also: Amsat Journal (USA) Vol 18 No.3, May/June 1995. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a114.zip --------------------------------------------------------------------------- An S-Band Beacon 1994 Dec No. 110 p 6 Review of the SSB Electronic S-band beacon that you can use to check if your satellite (2.4 GHz) S-band receive system is working. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a119.zip --------------------------------------------------------------------------- From Hardware to Vapourware; AO-13 Re-entry Plans Oscar News (UK) 1996 Jun No. 119 p 36-41 The presence of Earth's atmosphere at perigee robs AO-13 of energy, which is dissipated in the form of heat. This will cause burn-up around mid- December 1996. End-of-life effects are discernible as a) orbital period decrease and b) changes of attitude, c) heating. The first two are already observable. Aspects of AO-13's re-entry are explored in these notes. In particular a re-orientation to the unfamiliar attitude Alon/Alat = 90/0 is proposed from mid-August 1996. Also: The Amsat Journal (USA) Vol 19 No.4, Jul/Aug 1996 Also: Amsat-VK Newsletter No. 135/136, 1996 Jul/Aug Also: Amsat-DL Journal (D), Jg. 23, No. 3, Sep 1996 Also: Jamsat Newsletter (JA) No. 176, 1996 Aug 30 It is available on-line from as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a121.zip --------------------------------------------------------------------------- Putting Wire Back Into Wireless Oscar News 1995 Jun No. 113 p 10-11 "Much of what used to be the 'ham spirit' is now living on the Internet, and it's in better shape too". Quote from an e-mail. Discussion. --------------------------------------------------------------------------- Oscar-13 Re-Entry Keplerian Elements Oscar News 1995 Oct No.115 p 36-37 To assist operators with keeping up-to-date with tracking AO-13's re-entry in 1996 Dec, predicted elements were computed. This data and supporting information is at: ftp://ftp.amsat.org/amsat/satinfo/ao13/decaykep.zip --------------------------------------------------------------------------- Oscar-13's Life and Death Oscar News 1997 Feb No.123 p 24-29 Oscar-13 was launched from Kourou on 1988 Jun 15th on the first test flight (V-22) of the Ariane 4 rocket, along with Panamsat and Meteosat P2. Eight and a half years later AO-13 re-entered and burned up, on 1996 Dec 5th. Also: The Amsat Journal (USA) Vol 20 No.2, Mar/Apr 1997 Also: Amsat-DL Journal (D), Jg. 24, No. 1, Mar/May 1997 Also: Jamsat Newsletter (JA) - In preparation It is available on-line from as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a122.zip or the www presentation: http://www.amsat.org/amsat/articles/g3ruh/122.html --------------------------------------------------------------------------- Phase III Ranging System Oscar News (UK) 1997 Oct No.127 Also: The Amsat Journal (USA) Vol 20 No.5, Sep/Oct 1997 Also: Amsat-DL Journal (D), Jg.25, No.1, Mar/May 1998 Also: Jamsat Newsletter (JA) No. 197, 2000 Oct Ranging is the process of measuring the distance from a station to a satellite. Ranges made at different times, and from several locations are used to determine the specifics of an orbit and compute Keplerian elements. P3D, like its predecessors P3A, Oscar-10 and Oscar-13 is supported by ground station software and hardware to enable this. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a123.zip or the www presentation: http://www.amsat.org/amsat/articles/g3ruh/123.html --------------------------------------------------------------------------- The Experimental IHU-2 Aboard P3D Co-authored by Chuck Green, Peter Gülzow, Lyle Johnson, Karl Meinzer and James Miller Proceedings of 13th Amsat-UK Colloquium 1998, Guildford Surrey, England. pps 128-138 Also: Proceedings of the 16th annual Amsat-NA Space Symposium, Vicksburg, Mississippi, USA, 1998. pps 142-152. Also: The Amsat Journal (USA) Vol 22 No.2, Mar/Apr 1999 Abstract IHU-2 is intended to act as a future replacement for the current COSMAC- 1802-based flight computer (IHU) that has flown on all previous P3 missions and indeed controls the AMSAT P3D satellite. The IHU-2 is aboard P3D as a proof-of-technology experiment. Although in contact with other P3D sub- systems, it will not manage anything mission critical. These notes document the design from inspiration in September 1997 to running hardware/software, April 1998. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a124.zip or the www presentation: http://www.amsat.org/amsat/articles/g3ruh/124.html --------------------------------------------------------------------------- Oscar-40 FEC Telemetry Amsat-UK's Oscar News, 2003 Aug No.161 p.18-22 Also: The Amsat Journal (USA) Vol 26 No.5, Sep/Oct 2003 Also: Amsat-DL Journal (D), Jg.30, No.4, Dec/Feb 2003/2004 Also: Amsat-OZ Journal (DK) No.125 September 2003 Also: Amsat-SM Info (S) Nr.2 August 2003 Also: Jamsat Newsletter (JA) In prep. 2003-Sep Summary Phil Karn KA9Q has long argued that Amsat should adopt the communication strategies used routinely for several decades by NASA space missions. They have now been implemented experimentally on Oscar-40. The results are truly spectacular. Indeed we must surely adopt strong Forward Error Correction (FEC) by default on future missions. This article describes the system, and presents results with AO-40. Using FEC, if you can hear it, it decodes; error-free! It is available on-line as the www presentation (only): http://www.amsat.org/amsat/articles/g3ruh/125.html --------------------------------------------------------------------------- IN OTHER MAGAZINES ------------------ ALL OSCAR TELEMETRY ------------------- J.R. Miller, "Decoding OSCAR Telemetry, Part 1", 73 Amateur Radio (US), 1989 May pps 20-22. Part 2, 1989 June pps 58-61. UOSAT 1/2 Two-tone Demodulator ------------------------------ J.R. Miller, "Data Decoder for UOSAT", Wireless World (UK), 1983 May pps 28-33. OSCAR-10/13 PSK Demodulator --------------------------- J.R.Miller, "Telemetry Decoder for Oscar-10", Electronics and Wireless World, (UK), 1984 Oct, pps. 37-41, 59-60. Part 2, 1984 Nov, pps.37-38 J.R. Miller, "A PSK Telemetry Decoder for Oscar-10", Ham Radio Magazine (US) 1985 Apr, pps. 50-62. J.R. Miller, "A PSK Telemetry Decoder for Oscar-10", Radio Rivista (Italy) May/Jun 1984 *** This design is superceded by MK II - See Oscar News 1992 Dec. *** FUJI FO-12/FO-20 PSK Modem -------------------------- J.R. Miller, "A Packet Radio PSK modem for JAS-1/FO-12", Ham Radio Magazine (US), 1987 Feb, pps.8-22. HELIX ANTENNAS -------------- J.R. Miller, "Helical Antennas for 435 MHz", Electronics and Wireless World, (UK), 1985 Jun, pps. 43-46. Parts kit available. --------------------------------------------------------------------------- 9600 BAUD PACKET & UOSATs etc ----------------------------- J.R. Miller, "9600 Baud Packet Radio Modem Design", Papers of ARRL 7th Computer Networking Conference (US), Oct 1988. pps 135-140 J.R. Miller, "A 9600 Baud Packet Radio Modem", Proceedings of the first RSGB Data Symposium, Harrow, England July 1988. (12 pps). Also part of chapter 1: "Packet: Speed, More Speed and Applications", ARRL 1995. ISBN 0-87259-495-5 The theoretical minimum audio bandwidth required to send 9600 baud binary data is 4800 Hz. Since a typical NBFM radio has an unfiltered response from zero to some 8 kHz, transmission of 9600 baud binary data is perfectly possible through it. This paper describes a successful implementation. It is available on-line from as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a109.zip --------------------------------------------------------------------------- SATELLITE ATTITUDE DETERMINATION -------------------------------- J.R. Miller, "Oscar-10 Attitude Determination", Proceedings of the 4th annual Amsat Space Symposium, Dallas Texas, USA, 1986. pps 20-34. Other Articles in OSCAR NEWS ( 36 Entries 1997 Aug 16 ) ---------------------------- These are references to short pieces that could be described as somewhere between news items, notes and full blown dissertations. Some are of course ephemeral, but many contain useful little observations, or raisons d'etre that are otherwise lost for ever. I know as I re-read them all when checking the compilation, and am surprised at the minutiae therein recorded. Oscar-10 and Oscar-13 management is reported here as almost nowhere else. Title Oscar News Issue -------------------------------------------------------------------- UoSAT - In Drag 1983 Jan No. 40 p.13 UoSAT-1 Telemetry Printout 1983 Jun No. 42 p.6-7 UoSAT Data Decoder Photo 1983 Jun No. 42 p.17 Oscar10.BAS - A Rationale 1984 Apr No. 46 p.5 Oscar10/RSGB Sunday News Broadcasts 1984 Apr No. 46 p.27 PSK Rules, OK? / Good Morning Sunset 1984 Oct No. 49 p.2-3 News via AO-10 Comments/Feedback 1984 Oct No. 49 p.8 News Schedule 1985 1984 Dec No. 50 p.7 Angry Letter (About EMEer on AO-10) 1984 Dec No. 50 p.33 AO-10 Telemetry/Dissenting Commentary 1984 Dec No. 50 p.34-36 AO-10 Telemetry on the Spectrum 1985 Apr No. 52 p.22 UOSAT Data Decoder - Announcement 1985 Apr No. 52 p.22 Oscar-10 News News 1985 Apr No. 52 p.23 Bird Watching (UO-11 Optical Visib.) 1985 Jun No. 53 p.19 AO-10 Orbit Number Funnies 1985 Oct No. 55 p.25 G3RUH Helix Antennas - Advertisement 1985 Dec No. 56 p.26 JAS-1's Initial Orbits 1986 Jul No. 60 p.4-5 Decoderless UOSAT Decoding Not Good 1986 Jul No. 60 p.29 New Oscar-13 Attitude (Diagram) 1988 Oct No. 73 p.35 AMSAT's Microsats 1988 Dec No. 76 p.5 OSCAR-13 Telemetry Display BBC (Ad) 1989 Aug No. 78 p.9 OSCAR-13 Attitude Change - Tech Data 1989 Oct No. 79 p.10-11 OSCAR-13 Computer Crashes Twice 1989 Dec No. 80 p.29 Oscars 14,15,16,17,18,19,20 are born 1990 Apr No. 82 p.2-5 FO-20 and The Yaesu FT736R 1990 Apr No. 82 p.6 First P3D Satellite Experimenters Mtg. 1990 Apr No. 82 p.10-11 SATFOOT for the Acorn Archimedes 1991 Oct No. 91 p.29 G3RUH Acorn Archimedes Software (Ad) 1993 Feb No. 99 p.6 Oscar-13 Mode Schedules 1993 1993 Feb No. 99 p.7-9 9600 baud Modem - Use at higher speeds 1993 Oct No.103 p.19 Oscar-13 Schedules 1994 1994 Jun No.107 p.9 OSCAR-13 Telemetry Display Acorn RISC (Ad) 1994 Jun No.107 p.12 Amsat-UK 60cm Dish Offer (Ad) 1994 Aug No.108 p.19 Mods to MK.I AO-10 400 Baud PSK Data Demod 1995 Apr No.112 p.28 Oscar-13's Mean Motion 1996 Feb No.117 p.41-42 IPS - P3 Flight Computer's OS. Book (Ad) 1996 Apr No.124 p.40 --------------------------------------------------------------------