1. Rheinisches Institut für Umweltforschung RIU Abt. Planetare Forschung
Rosetta
Radio Science Investigations
(RSI)
Martin Pätzold, Silvia Tellmann
Rheinisches Institut für Umweltforschung RIU
Abt. Planetare Forschung
Universität zu Köln
B. Häusler
Institut für Raumfahrttechnik, Universität der Bundeswehr München, Germany

2. Team Status & Recent Activities
No changes
RSI activities since last SWT: PC
Purpose: check the stability of the USO

3. Reconstructed Transmitted USO Frequencies
Switch OFF of USO

4. Passive Checkout 9

5. RSI PC9 Measurement Overview
ONED-TCXO
ONED-USO
ONED-TCXO
TWOD-X

6. RSI PC9 Measurement Overview
ONED-USO
ONED-TCXO
TWOD-X

7. USO measurement: First part
End of noisy
measurement
part
Start of USO
measurement

8. USO measurement: First part
End of noisy
measurement
part
Start of USO
measurement

9. Noisy Measurement Part: Residual & AGC
Signal Level (AGC)

10. Comparison with typical residual
35 Hz
Residual
Typical Residual
50 mHz

11. End of Noisy Measurement Part
Residual
3dBm
Signal Level (AGC)
End of noisy measurement part

12. End of Noisy Measurement Part (Zoomed in)
Residual
Signal Level (AGC)
End of noisy measurement part

13. Remaining USO Measurement: Residual
Signal Level (AGC)
8dBm
TM OFF

14. Summary Passive Checkout 9
First ~750 s of USO measurement show several frequency jumps
Explanation: False Lock on Transponder 2

15. TM: Transponder 2 RX DC Current

16. TM: Transponder 2 RX DC Current

17. Summary Passive Checkout 9
First ~750 s of USO measurement show several frequency jumps
Explanation: False Lock on Transponder 2
Happens at start of measurement
Lasts for a few minutes
Remaining USO measurement as expected! USO behaves quite well!