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COMMUNICATING OVER LOE FM SATELLITES

COMMUNICATING OVER LOE FM SATELLITES. LARRY BROWN WB5CXC. WB5CXC making a satellite contact. Equipment. Dual Band Handheld - 2M & 70 CM Dual Band Antenna - 2M & 70 CM (3 elements on 2M - 6 elements on 70 CM) Duplexer for the antenna Satellite Tracking Program

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COMMUNICATING OVER LOE FM SATELLITES

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  1. COMMUNICATING OVER LOE FM SATELLITES • LARRY BROWN • WB5CXC

  2. WB5CXC making a satellite contact

  3. Equipment • Dual Band Handheld - 2M & 70 CM • Dual Band Antenna - 2M & 70 CM (3 elements on 2M - 6 elements on 70 CM) • Duplexer for the antenna • Satellite Tracking Program • Portable Recorder (optional)

  4. FINDING THE SATELLITES • THERE ARE SEVERAL PROGRAMS AVAILABLE • ORBITRON IS A CARDWARE PROGRAM

  5. Orbitron Main Screen

  6. Setting up for a Prediction

  7. Results of a Prediction

  8. What kind of coverage etc. do we have at 4/01 @ 9:30

  9. Azimuth Elevation On 4/01/08 at 20:35 at 10 deg. elevation and 177 deg. azimuth you will get AOS (Acquisition of Signal). On 4/01/08 at 20:40 at 63 deg. elevation and 258 deg. azimuth you have Mid-Path (highest elevation). On 4/01/08 at 20:45 at 10 deg. elevation and 340 deg. azimuth you will get LOS (Loss of Signal). Most of the time you need to try for a Mid-Pass elevation above 30 deg. ~ 10 deg. elevation is the practical elevation to start hearing the satellite and ~ 15 deg. is where you can start making contacts.

  10. Simulation of a pass in the Future

  11. MacDoppler - MAC program - 3D View

  12. MacDoppler - MAC program - 2D View

  13. Antenna • Dual Band Antenna - 2M & 70 CM (3 elements on 2M - 6 elements on 70 CM) • Homebuilt using a 1” X 2” pine boom ~ 3’ • Elements are made from #8 solid copper wire • Arrow Antenna Duplexer

  14. Antenna Plans • Cheap Antenna designed by WA5VJB • Web site www.fredspinner.com/W0FMS/cheapyagi/vjbcy.html • 2M Elements are rotated 90 degrees from 70 CM Elements • Arrow Antenna 10W duplexer (board + parts ~ $ 29)

  15. Elements are #8 bare copper wire (~ 1/8”)

  16. 440 Mhz Driven Element

  17. 3 Element 2 M Yagi

  18. 2M Driven Element

  19. WA5VJB Cheap Antenna Design 2M & 70CM

  20. Arrow Antenna 10W Duplexer

  21. AO-51 Frequencies • Transmit 145.920 • Receive 435.300 + 10 Khz doppler effect • Doppler Effect - satellite coming towards you - the frequency is higher - when the satellite is going away the frequency is lower

  22. AOS Mid-Pass LOS

  23. Operating • Set your handheld for receive on 435.310 and transmit 145.920 tone 67.0 hz • Open your squelch (satellite won’t be full quieting) • Observe the time and point your antenna toward the bearing and elevation as indicated by the software • When the noise starts to fade you are starting to pick up the satellite

  24. Yaesu VX-5 Using both VFOs 1 for Tx the other for Rec’v

  25. Azimuth Elevation On 4/01/08 at 20:35 at 10 deg. elevation and 177 deg. azimuth you will get AOS (Acquisition of Signal). On 4/01/08 at 20:40 at 63 deg. elevation and 258 deg. Azimuth you have Mid-Path (highest elevation). On 4/01/08 at 20:45 at 10 deg. elevation and 340 deg. Azimuth you will get LOS (Loss of Signal). Most of the time you need to try for a Mid-Pass elevation above 30 deg. ~ 10 deg. elevation is the practical elevation to start hearing the satellite and ~ 15 deg. is where you can start making contacts.

  26. The satellite will start to fade, rotate your antenna to get a stronger signal (changing the antenna phase). As the signal gets muffled or the satellite gets higher you will have to decrease the frequency due to the doppler effect. Typical exchanges are short - “This is Whiskey Bravo 5 Charlie Xray Charlie Echo Mike 2 0” “Copy EM 2 0 - N5FGM EM 45” The exchange is your call sign and your Grid Square - mine is EM20. Give your call using ITU phonetics.

  27. Worked Grid Square program: http://VE2ZAZ.net/WorkedGrids/WorkedGrids.htm

  28. IOio Satellite Antenna

  29. 432 IO Satellite Antenna

  30. Egg Beater II - 432Mhz

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