Reception of Voyager 1 the best DX ever! - UHF-Satcom.com
Reception of Voyager 1 the best DX ever! - UHF-Satcom.com Reception of Voyager 1 the best DX ever! - UHF-Satcom.com
How to use? • 1 AU distance � path loss = 274.4 dB • 1.5 AU (Venus today) � path loss = 276.2 dB • 2.5 AU (Mars Today) � path loss = 278.8 dB • 100 AU distance � path loss = 314.4 dB 1. Find out EIRP of spacecraft carrier : Transmit power + antenna gain – carrier suppression 2. Subtract path loss 3. Add RX antenna gain 4. Compare to receiver noise in assumed bandwidth (1 Hz) 5. Result: Signal-to-Noise Ratio in 1 Hz Bandwidth Amsat-UK Colloquium 2006 Achim Vollhardt, DH2VA/HB9DUN 14
Transmit side Find out EIRP of spacecraft (DESCANSO + Google): • MRO: 100 W (50 dBm) + 3m dish (45.5 dBi) = 95.5 dBm (3.5 MW !) carrier suppression -10 dB: 85.5 dBm • VEX: 65 W (48.1 dBm) + 1.3m dish (38.3 dBi) = 86.4 dBm (436 kW) carrier suppression -10 dB: 76.4 dBm • Voyager 1: 18 W (42.5 dBm) + 3.74 m (48.2 dBi) = 90.7 dBm (1 MW) carrier suppression -6 dB: 84.7 dBm Amsat-UK Colloquium 2006 Achim Vollhardt, DH2VA/HB9DUN 15
- Page 1 and 2: Reception of Voyager 1 the best DX
- Page 3 and 4: Some basics • Deep space probes t
- Page 5 and 6: • James Miller, G3RUH Pull togeth
- Page 7 and 8: Ask the experts ! • Write email t
- Page 9 and 10: • Three-axis stabilized s/c • 3
- Page 11 and 12: SFOS: space flight operations sched
- Page 13: Standard version: One-way ‘Radar
- Page 17 and 18: • Diameter : 20 m • Efficiency
- Page 19: Performance Simulation • G3RUH ge
How to use?<br />
• 1 AU distance � path loss = 274.4 dB<br />
• 1.5 AU (Venus today) � path loss = 276.2 dB<br />
• 2.5 AU (Mars Today) � path loss = 278.8 dB<br />
• 100 AU distance � path loss = 314.4 dB<br />
1. Find out EIRP <strong>of</strong> spacecraft carrier :<br />
Transmit power + antenna gain – carrier suppression<br />
2. Subtract path loss<br />
3. Add RX antenna gain<br />
4. Compare to receiver noise in assumed bandwidth (1 Hz)<br />
5. Result: Signal-to-Noise Ratio in 1 Hz Bandwidth<br />
Amsat-UK Colloquium 2006 Achim Vollhardt, DH2VA/HB9DUN 14
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