First report about the commissioning of the new Effelsberg sub ...

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CONTENTS 1 Introduction 1 2 The New Sub-Reflector 2 3 Improvements 5 3.1 Secondary Focus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1.1 Sensitivities and Gain Curves . . . . . . . . . . . . . . . . . . . . . . 5 3.1.2 Focus curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2 Primary Focus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2.1 Multi-Receiver Boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 Remaining questions 12 A Focus Parameters 14 B Active Surface 15 C Observations 17 C.1 Update of old Focus Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 C.2 New Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 C.3 Multi-Frequency Boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 C.4 New Gain Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 I
LIST OF FIGURES 2.1 Coordinate system of the Hexapod. . . . . . . . . . . . . . . . . . . . . . . . 4 3.1 Predicted and measured gain-elevation dependence. . . . . . . . . . . . . . . 6 3.2 New gain curves SFK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Comparison of the new and old focus curves. Please note that the new curves have a different sign and are multiplied by (−1) to allow a better comparison. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.4 Comparison of the new focus curves for SFK. . . . . . . . . . . . . . . . . . 9 3.5 Comparison of old and current prime focus curves. . . . . . . . . . . . . . . 10 3.6 Focus measurements at 1.3cm . . . . . . . . . . . . . . . . . . . . . . . . . . 11 B.1 Active surface positions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 C.1 Two radial de-focused cross scans in azimuth. . . . . . . . . . . . . . . . . . 18 C.2 Strongly de-focused elevation scan. . . . . . . . . . . . . . . . . . . . . . . . 19 C.3 Calibration maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 C.4 Relative amplitude of cross scans taken at different ylin positions at 5 cm (prime focus). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 C.5 Relative amplitude of cross scans taken at different ylin and xrot positions for 3.6 cm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 C.6 Relative amplitude of cross scans taken at different ylin and xrot positions for 2 cm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 C.7 Relative amplitude of cross scans taken at different xlin and ylin . . . . . . . 22 C.8 Relative amplitude of cross scans taken at different xlin and ylin . . . . . . . 22 C.9 Old and new gain curve at 9mm. . . . . . . . . . . . . . . . . . . . . . . . . 23 C.10 Old and new sensitivity at 9mm. . . . . . . . . . . . . . . . . . . . . . . . . 23 C.11 Old and new gain curve at 2.8cm. . . . . . . . . . . . . . . . . . . . . . . . . 24 C.12 Old and new sensitivity at 2.8cm. . . . . . . . . . . . . . . . . . . . . . . . . 24 II
Page 1: First report about the commissionin
Page 5 and 6: Chapter 1 Introduction On October 5
Page 7 and 8: can be stored and kept cool in the
Page 9 and 10: 3.1 Secondary Focus Chapter 3 Impro
Page 11 and 12: 3.1. Secondary Focus 7 Gain 1.05 1
Page 13 and 14: 3.2. Primary Focus 9 x-lin [mm] 20
Page 15 and 16: 3.2. Primary Focus 11 T_A [K] 11.2
Page 17 and 18: BIBLIOGRAPHY Kesteven, M., Graham,
Page 19 and 20: Appendix B Active Surface Figure B.
Page 21 and 22: Appendix C Observations This sectio
Page 23 and 24: C.2. New Parameters 19 8523 1 1 3.2
Page 25 and 26: C.4. New Gain Curves 21 S_norm 1.06
Page 27 and 28: C.4. New Gain Curves 23 Gain Sensit

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