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Digital Satellites

Digital Satellites. Working PCSat I/II, ISS and AO-51 Experimental Digital Modes. Agenda. Overview of Digital Satellites/Modes History of PCSat and PCSat2 How to work PCSat2 D700 Config Suggestions ISS How to do I get started? D700 Configuration HowTo PC/Windows Howto

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Digital Satellites

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  1. Digital Satellites Working PCSat I/II, ISS and AO-51 Experimental Digital Modes

  2. Agenda • Overview of Digital Satellites/Modes • History of PCSat and PCSat2 • How to work PCSat2 • D700 Config Suggestions • ISS • How to do I get started? • D700 Configuration HowTo • PC/Windows Howto • Other Digital Satellites • CubeSats • Cute • Links / More Information KU7M

  3. Overview – Types of Digital Sats • Starter / Easy • Basic terrestrial packet TNC • 1200 bps AFSK, AX.25 • Advance • Special packet TNC for satellites • Typically 9600 bps FSK using PACSAT • Modern satellite transceiver or mod to older unit • PACSAT control software (rigs, antennas, etc) • Super advanced – 9600 bps up and 38400 bps down • Other • Not technically satellite(s), but operate the same KU7M

  4. PCSAT-1 (NO-44) • PCSat – Launched Sept 30th, 2001 • Built by US Naval Academy • Unique sat, only has two TNC’s for processors (KPC-9612+) • Officially declared “dead” Sept 2003 • Death due to batteries • Online for 19 months, 2000 users world wide, averaged 50 users per 8 hour period • In reality batteries are only semi-dead, when in full sun bird comes “alive”. KU7M

  5. PCSat-1 Details • Operates on 2m - 145.825Mhz • Address as PCSAT or WIDE2-2 • Easy to work • Can be heard with HT and rubber duck • If not busy, can also get into bird with HT at 5watts with ‘good’ rubber duck. (D7/D700 excellent radios for this) KU7M

  6. PCSat2 • Not “technically” digital satellite • Launched or “attached” in 2005 • Was removed from service on Sept 15th, 2006 • Besides comm hardware, includes NRL solar experiments • APRS used to beacon data from experiment • Supported Modes • Digipeater: supports both 2m and 70cm and 1200/9600 baud • PSK31 Analog transponder: 10m USB uplink and 70cm FM downlink • Full duplex FM voice repeater (Intended purpose is for ISS crew) KU7M

  7. PCSat2 / ISS Picture KU7M

  8. PCSat2 Close-up KU7M

  9. PCSat2 Details • Telemetry for NRL solar experiment • 9600 baud downlink at 435.275 • PSK31 Analog Transponder • 29.4 Mhz USB uplink • 435.275 FM downlink • Digipeater • 435.275 FM 1200 baud downlink/145.825 uplink • 145.825 FM 1200 baud downlink/435.275 uplink KU7M

  10. ISS APRS Digipeater • Kenwood D700 installed 12/2003 • When enabled, ISS D700 becomes a very wide coverage digipeater • Uplink: 145.99Mhz • Downlink: 145.80Mhz • Digi-Path: ARISS, RS0ISS-3, WIDE2-2 • http://www.ariss.net/ KU7M

  11. So how do I start playing? • Two easy ways to get started • 1st Solution: Leverage D700 • Great because built in 9600 and 1200 TNC • Dual VFO support (2m/70cm) • 2nd solution using Windows PC and standard 1200 baud TNC • Great because nearly everybody has today KU7M

  12. D700 Suggestions • Leverage PM mode – allows changing personality of radio without pain of re-configuration • Suggest two configurations • PCSat2 • ISS Voice • Add PCSat2 and ISS downlink freq to scan – when hear activity can switch over KU7M

  13. D700 Config - ISS Packet Mode • Band A (left) – Config for Trans on 145.800 • Band B (right) – Config for Recv on 145.990 • Configure SSID to something different then normal SSID (i.e. KU7M-6) • Path (menu 3-b): ARISS,SGATE,WIDE2-2 • Beacon Rate (menu 3-d): to 0.5 or 1 • Suggest setting Message group (menu 3-P) to “*” – will enable you to see all messages KU7M

  14. ISS Packet Mode - Pic KU7M

  15. Windows Solution - UISS • Packet problem specifically for ISS and PCSat • Designed to send UPROTO messages or APRS locations/messages • Support digi sats like NO44, ISS, PCSat2 • Supports AGW Packet Engine • Can hook into UI-View for display of sats KU7M

  16. UISS by ON6MU KU7M

  17. Quick Aside • Great, I want to go try working on of these birds. But how do I find out when they are over head? • What you need is a satellite tracking program, lots of solutions • Windows: SatScape (free solution) • Mac/OSX: MacDopplerPro X (for pay) • Linux: Predict (free solution) • Web: Heavens-Above KU7M

  18. Links Page • Tracking Software • Windows: Satscape • Mac: MacDopplerPro • Linux: Predict • Web: Heavens-Above • AO-51 Presentation, KK7P • Pictures of construction KU7M

  19. Backup/Overflow KU7M

  20. AO-51 • Odd set of conditions lead contributed to mission goals • Amsat-NA hadn’t designed and launched bird since 1990, need to keep the skills sharp • EasySats are very popular • Needed success after AO-40 • Stepping stone for Eagle • Many different modes supported, including a “Experimenters Wednesday” KU7M

  21. AO-51 • Store and forward bulletin board system (BBS) using PACSAT protocol suite • Address as PECHO-12 • Digital downlinks also contain telemetry • 9600 bps FM FSK, 2m uplink and 70cm downlink • Experimenter’s Day • Default signals is digital: 1268.7 Mhz up at 9600 bps and 2401.2 Mhz down at 38.4k bps • Another common: 10m SSB UP/ 70cm FM down using PSK31 (or CW) KU7M

  22. Why Advanced Bird? • Really need Az/El rotators and gain antennas to track bird • Some people are successful with omni directional antennas, but limited to passes between 20° and 40° • Bird moves fast, so to maintain digital link, need to automate tracking (if using gain antennas) • Special software called WISP that controls rotators, PC, and connections • Requires “specialized” radios • Support multiple bands at same time • For 9600 bps and up, special connection required in radios KU7M

  23. AO-51 Modes • FM Repeater, V/U Mode • Uplink: 145.920 FM 67 hz PL tone • Downlink: 435.300 FM • FM Repeater, V/S Mode • Uplink: 145.920 FM, No PL tone • Downlink: 2401.200 FM • FM Repeater, L/U Mode • Uplink: 1268.700 FM No PL tone • Downlink: 435.300 FM • 9k6 Digital V/U Pacsat Broadcast Protocol BBS • Uplink: 145.860 FM, 9k6 PBP Digital • Downlink: 435.150 FM, 9k6 PBP Digital • Can support periodic APRS status messages KU7M

  24. History of PCSat’s • PCSat – Launched Sept 30th, 2001 • Built by US Naval Academy • Unique sat, only has two TNC’s for processors (KPC-9612+) • Officially declared “dead” Sept 2003 • Batteries no longer able to support system • Online for 19 months, 2000 users world wide, averaged 50 users per 8 hour period KU7M

  25. Path’s for PCSat’s • ARISS works for ARISS, PCSAT2 and PCSAT-1 • WIDE2-2 works for at least PCSAT2 and PCSAT-1 when both are on 145.825. • For 2 hops use ARISS,ARISS or WIDE2-2 KU7M

  26. Random Things • Some people trying PSK31 through FO-29 (Linear Satellite) KU7M

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