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Noté. / 5. Basé sur avis des utilisateurs
RC2000A Dual Axis Antenna Controller Appendix I 2.6x Addendum 109
is perfectly aligned with a satellite) gives the best performance. Stated another way, the step size
should be the antenna pointing error in degrees from antenna boresight, that corresponds to an antenna
pointing loss of 0.5 to 1.0 dB.
For an elevation over azimuth type antenna mount, to determine the optimal elevation step size it is
necessary to know …
1. The angular deflection (in degrees) that results in a given drop in signal strength (in dB - note that
this relationship is a function of frequency band), and
2. The antenna’s elevation axis position_count per degree characteristic.
Mathematically, this is represented as …
El Step Size (position counts) = Angle (degrees) x (elevation position counts / degree),
where Angle is angular deflection away from antenna boresight (in degrees) that results in the desired
drop in signal strength (0.5 to 1.0 dB).
The calculation of the optimal azimuth step size is similar to that for the elevation axis except that an
additional correction factor is required to account for the fact that one degree of azimuth movement
does not change the antenna pointing angle by one degree when the elevation angle is greater than
zero. To visualize this, note that if the elevation angle could be adjusted to 90 degrees (the antenna
pointing straight up), azimuth movement does not change the antenna pointing angle at all, it merely
rotates the antenna (changes polarization). The correction factor varies with antenna elevation angle
which is related to the latitude of the earth station.
Mathematically, this is represented as …
Az Step Size (position counts) =
Angle (degrees) x (azimuth position counts / degree) x
(degrees of az movement for one degree of antenna pointing angle change)
3.5.2 Pointing Error (degrees) Given Pointing Loss (dB) Relationship
The following relationship calculates antenna pointing error (in degrees) given antenna pointing loss (in
dB) …
Antenna_Pointing_Error (deg) =
[SQRT[Signal_Loss (dB)] x 5.55] / [Antenna_Diameter (meters) x frequency (GHz)]
The following table gives the antenna pointing error (in degrees) for 0.5/1.0 dB pointing loss values for
C Band (4 GHz) and Ku Band (12 GHz).
Antenna Diameter C Band (degrees)
0.5 dB / 1.0 dB
Pointing Loss
K Band (degrees)
0.5 dB / 1.0 dB
Pointing Loss
2.4 meters 0.41 / 0.58 0.14 / 0.19
3.1 meters 0.32 / 0.45 0.11 / 0.15
3.8 meters 0.26 / 0.36 0.09 / 0.12
4.5 meters 0.22 / 0.31 0.07 / 0.10
6 meters 0.16 / 0.23 0.05 / 0.08
Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas • 66218-9680 • USA www.researchconcepts.com
- RC2000A DUAL AXIS 1
- ANTENNA CONTROLLER 1
- TABLE OF CONTENTS 3
- REVISION HISTORY 7
- Chapter 1 INTRODUCTION 11
- 1.2 Before You Begin 12
- 2.1 Front Panel 13
- Figure 2.2 14
- 2.2 Operating Modes 15
- 2.4 Mode Access 18
- 2.5 Expert Access 18
- 2.6 AutoPol 18
- 3.1 Before You Begin 20
- SIG DRIVE 22
- 24-36VDC 23
- AZIMUTH MOTOR 23
- ELEVATION MOTOR 23
- POTENTIOMETER 25
- 3.4.2 Setting Limits 27
- 3.4.3 Geo Elev Position 27
- 3.5 Slow Speed Adjustment 28
- 3.6 Programming Satellites 28
- 3.8 AutoPol 30
- 4.1 MANUAL Mode 33
- 4.2 AUTO Mode 33
- 4.3 REMOTE Mode 34
- 4.4 SETUP Mode 34
- 4.5 RESET Mode 36
- 4.6 DELETE Mode 37
- 4.7 RE-SYNC Mode 37
- 4.8 AZIM SLOW Mode 38
- 4.9 ELEV SLOW Mode 38
- 4.10 CONFIG Mode 38
- 4.10.1 AutoPol 39
- Compatibility 45
- 4.11 LIMITS Mode 48
- 4.12 POL LIMITS Mode 49
- Chapter 5 SPECIFICATIONS 50
- 6.1 SYSTEM ERROR CODES 51
- Appendix B - Field Upgrading 56
- SPEED:SLOW SAT: GALAXY 6 82
- Drive Board Layout 88
- Processor Board Layout 89
- Comm Port Wiring Legend 90
- Research Concepts, Inc 91
- RC1KADP Schematic 92
- RC2KPOL Schematic 93
- RC2KHPP Schematic 94
- Processor Board Schematic 95
- Drive Board Schematic 96
- 1.0 Introduction 97
- 1.1 Version Identification 97
- 2.0 Signal Strength 98
- 3.0 Signal Strength Peakup 105
- 3.2 Peakup Algorithm 106
- 3.3 Peakup Errors 107
- Selection 107
- 3.5 Step Size Selection 108
- Characteristic 110
- Mounts) 111
- Version of the Software 112
- 4.1 Sticky Key Jog 113
- 4.3 New CONFIG Mode Items 113
- 4.6 Upgrading Controllers 117
- Declaration of Conformity 119
- WARRANTY 121
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