• The effective isotropic radiated power from Rosetta (HGA in X-Band) is 57 dBW

• At Rosetta’s current distance (2.7AU), received power in air will be -225 dBW • ESA’s New Norcia 35m station as a reference, and thanks to its 1000m2

antenna collecting surface and gain of 68 dBi

• Rosetta’s weak signal is captured and results in a received power of -157 dBW – just 1.8 Femto-Watts.

• LNA is operated at -2600 C Noise Floor kT equals -186 dBm/Hz

• TX power of Rosetta is 28 W using a antenna dish sized 1.8 m

News Nov. 2014

• Rosetta is presently sending signals to the ground stations at about 28 Kbps X-Band 8.421 GHz. Noise is -142 dBm S/NRF = Eb/N0 = 15 dB• Downlink telemetry commands 2 kbit/s, • Instrument data 26 kbit/s with a square wave subcarrier of 260 kHz which is

BPSK modulated • Command telemetry: PM with a square wave subcarrier of 16 kHz which is

BPSK modulated (high Doppler resistant)

News Nov. 2014

100 kHz/Div ©Bertrand Pinel, setileague.org

• Effective isotropic radiated power at 7.18 GHz (X-Band) is 52 dBW

• New Horizons distance at Pluto is 5·1012 m, received power in air is -250 dBW • NASA’s 70m dish station as a reference, and thanks to its 3800m2 antenna

collecting surface and gain of 74 dBi

• New Horizons’s weak signal is captured and results in a received power of -176 dBW – just 0.05 Femto-Watts.

• LNA is operated at -2600 C Noise Floor kT equals -186 dBm/Hz

• TX power of New Horizons is 12 W using a antenna dish sized 2 m (42 dBic)

News July. 2015

• New Horizons is presently sending signals to the ground stations at about 4 Kbps X-Band 7.18 GHz. Noise is at -150 dBm S/NRF = Eb/N0 = 4 dB• Signal rroundtrip time is 9 hours, • Instrument data rate is 2 kbit/s (scalable down to 8 bit/s) • Receiver bandwidth 1 kHz, Noise level is -156 dBm, • Signal level is -146 dBm, SNR is ideally 10 dB (Coding Gain)• Data is BPSK modulated on a sinusoidal subcarrier of 16 kHz• Subcarrier is PM modulated on X-band residual carrier

News July 2015