Amateur Radio Satellites

Transcription

1 Amateur Radio Satellites Presented to Virginia Tech Amateur Radio Association By Zach Leffke, KJ4QLP October 2, 2012

2 Agenda The Satellites Orbits and Stuff AMSAT FM Transponders Linear Transponders The Ground Station Antennas / Polarization Tracking Radios and Doppler An Exchange

3 The Satellites What Are They? images from: &

4 The Satellites How Do they Get Into Space? images from:

5 Orbits What s an orbit and why do I care? DOPPLER SHIFT TRACKING images from:

6 AMSAT The Radio Amateur Satellite Corporation

7 AMSAT The Radio Amateur Satellite Corporation

8 AMSAT The Radio Amateur Satellite Corporation

9 Satellite Transponders FM and Linear images from:

10 The Ground Station That s all great but how do I play with them? Short Answer: You need to be a Ham You need an antenna You need to know where to point the antenna You need a radio you need to know how to tune the radio you need to know how to do a proper exchange THAT S IT!

11 The Ground Station Antenna Low Noise Amplifier Coax Radio

12 The Ground Station RX Antenna TX Antenna Low Noise Amplifier Diplexer Radio Power Amplifier RX Antenna OR TX Antenna Low Noise Amplifier Power Amplifier Radio

13 The Ground Station OR

14 The Ground Station OR

15 The Ground Station I m a Ham, what s good enough? images from:

16 Antennas Polarization Vertical = LHCP OR Horizontal RHCP Photo Courtesy: images from: <- AWESOME ANIMATION

17 Antennas Omni images from: Qudrifilar Helix: Moxon Pair and Turnstile: A Simple Fixed Antenna for VHF/UHF Satellite Work by L.B. Cebik, W4RNL

18 Antennas Omni images from: Paper: An EZ-Lindenblad Antenna for 2 Meters by Anthony Monteiro, AA2TX

19 Antennas - Directional images from:

20 Antennas Directional RHCP Helical Polarization fixed by geometry of antenna Crossed Yagis (70cm and 2m) Polarization sense can be switched through phasing lines and relays Photos From:

21 Antennas - Tracking 70cm Crossed Yagi Elevator 2m Crossed Yagi Thrust Bearing Rotator

22 Antennas Tracking The way I do it Orbitron (More later) WISP DDE (More later) GS-232 Or Equivalent G-5500 Rotator Elevator Radio Antennas and stuff

23 Antennas Tracking Software Orbitron example

24 Antennas Tracking TLEs + SGP4 = AZ, EL, Doppler Shift JAS-2 (FO-29) U 96046B TECHSAT 1B (GO-32) U 98043D SEDSAT 1 (SO-33) U 98061B ISS (ZARYA) U 98067A PCSAT (NO-44) U 01043C SAUDISAT 1C (SO-50) U 02058C CUTE-1 (CO-55) U 03031E CUBESAT XI-IV (CO-57) U 03031J

25 Doppler Shift DEAD ON HIGHER LOWER T 1 Received Frequency higher than nominal frequency T 2 Received Frequency equals nominal frequency T 3 Received Frequency lower than nominal frequency Photo Courtesy of:

26 Doppler Shift Photo Courtesy of:

27 Doppler Shift Image: Screen Shot of Orbitron 3.71 Software Orbitron is free software created by Sebastian Stoff,

28 A Satellite Exchange Call Sign, 4 Digit Grid HAM A: K4KDJ HAM B: K4KDJ, K8YSE EN91 HAM A: K8YSE, copy you EN91, please copy my EM97 HAM B: K4KDJ, copy your EM97, QSL 73s HAM A: QSL, 73s Or maybe. HAM A: KJ4QLP HAM B: KJ4QLP, K8YSE EN91 HAM A: KJ4QLP, copy you EN91, please copy my EM97, the handle here is Zach HAM B: KJ4QLP, copy your EM97, handle here is John HAM A: Thanks for the contact John, 73s HAM B: QSL, 73s, and good luck How to find Grid locator? Grid:

29 Questions?