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1. Introduction

This web page provides the key performance parameters of the C-band transponders of Mabuhay Philippines Satellite Corporation (MPSC) Agila - II satellite to assist customers in the design of their earth stations.

Some time has passed since this page was written in 2002, but I am keeping it here as the full set of satellite transponder parameters is a good basis for practising link budget calculations.

Note that since orbital positions are allocated by international agreement, it may be necessary, because of future reallocation, for MPSC to interchange or relocate the satellite. Also, due to potential RF channel or satellite failures, customers may be required on short notice to change RF channels, frequencies within a channel and/or satellites. Customers should therefore ensure that their transmitters and receivers have the necessary frequency agility.

2. Satellite Orbital Location and Stationkeeping Accuracy

Orbital Location                            146° E Longitude
North - South Station Keeping    ± 0.05°
East - West Station Keeping       ± 0.05°
Attitude  (beam pointing)            ± 0.15°

3. Downlink Effective Isotropic Radiated Power (EIRP)

Fig 1 provides the downlink EIRP contour of the Agila - II typical C-band channel.
EIRP contours

4. Uplink Saturated Flux Density (SFD)

Fig 2 provides the SFD contour of the Agila - II typical C-band channel.
PFD contours

The Agila - II C-band channels contain commandable attenuators that control channel gain and hence, saturation flux density.   The attenuator can be set from 0 to 31.5 dB in 0.5 dB steps.   The nominal setting is 20 dB attenuation equivalent to gain step 23 and SFD of -88 dBW/m2 at G/T of -3 dB/K.

5. Uplink G/T Ratio dB/K

Figure 3 provides the uplink G/T contour of the Agila - II typical C-band channel.
G/T contours

6. Transponder Frequency Plan

The satellite has frequency and polarization plans.   (not yet included here).

7. Cross-polarization Isolation

The spacecraft transmit antenna has cross polarization of more than 27 dB over 100% of the coverage area.

8. TWTA Amplitude Transfer Characteristic

A typical TWTA amplitude transfer characteristic is shown in the curve (not yet available here).

9. Frequency Response Of Transponder Channel

The frequency response meets the requirements shown below at any frequency between the offsets shown.
+/- 12 MHz    Input -0.7 dB    Total -1.1 dB
+/- 18 MHz    Input -1.1 dB    Total -2.0 dB

10. Group Delay Response of transponder Channel

Transponder group delay limits are shown below:
0      MHz    Input 0            Overall 0
± 8   MHz    Input 3.74       Overall 10.95
± 12 MHz    Input 6            Overall 21.64
± 16 MHz    Input 12.35     Overall 49.93
± 18 MHz    Input 26.41     Overall 109.5

11. Gain Slope

The gain slope falls within the masks defined below (dB/MHz)
± 12  MHz    Input 0.06     Total 0.13
± 14  MHz    Input 0.07     Total 0.2
± 16  MHz    Input 0.2       Total 0.5
± 18  MHz    Input 0.7       Total 1.6

12. Total Phase Shift

The total phase shift does not exceed the values given below. Total phase shift is defined as the maximum shift of carrier phase when a single unmodulated carrier is varied from saturation and below.
Input Level (dB Below Saturation) and Maximum Relative Phase Shift (°)
Input Level    0  dB       Phase Shift (°)  49
Input Level   -3  dB       Phase Shift (°)  38
Input Level   -6  dB       Phase Shift (°)  27
Input Level   -9  dB       Phase Shift (°)  16
Input Level   -12 dB      Phase Shift (°)  10
Input Level   -14 dB      Phase Shift (°)   7
Input Level   -20 dB      Phase Shift (°)   0

13. System Redundancy

The Agila - II satellite has the following redundancy scheme:
Receiver Redundancy
4-for-2; tolerates two failures without loss of receive capability
Channel Amplifier/TWTA redundancy
Two rings with 19-for-15 redundancy

14. Beacon Technical Data

Beacon frequencies are:
Horizontal Polarization : 4196.000 MHz
Vertical Polarization :     4198.000 MHz

15. For further information:

20/F PLDT Tower-2, Ayala Avenue, Group 5, Naval Magazine
Makati City, 1226 Philippines Subic Bay Freeport Zone, 2222, Philippines
Tel. (63-2) 887-5788; Fax (63-2) 887-5789 Tel (63-47)252-9004; Fax (63-47)252-9002

This page was amended 19 Nov 2002, last amended 6 August 2015 with style changes and more links added, amended 15 Apl 2020 after character corruption.