AsiaSat Oscar-13 Frequencies 1/2
Oscar-13 Beacon and Transponder Information
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Transponders

Mode B: 150 kHz wide inverting linear transponder
Frequencies
Uplink: 435.420 - 435.570 MHz
Downlink: 145.975 - 145.825 MHz
Beacons: General 145.812 MHz; Engineering 145.985 MHz
Receive system characteristics
Effective system noise temperature: ??? K (NF = ??? dB)
Figure of merit: ??? dB/K        (with antenna gain of 9.5 dBic)
Transmitter characteristics
Power output: 17 dBW (50W) PEP; 11 dBW (12.5W) average
Intermodulation ratio (NPR method): -23 dBr
Downlink EIRP: 23dBW (200 W) PEP; 17dBW (50 W) avg (with 6 dBic gain)
Downlink 3 dB beamwidth: Approximately 100 degrees

Mode JL: 290 kHz wide inverting linear transponder
Frequencies
Uplinks:1) Mode L: 1269.620 - 1269.330 MHz
                2) Mode J: 144.425 -144.475 MHz
                3) RUDAK:  1269.710 MHz

Downlinks:1) Mode L: 435.715 - 436.005 MHz
                  2) Mode J: 435.990 - 435.940 MHz
                  3) RUDAK:  435.677 MHz
Beacon: General      435.651 MHz
Receive system characteristics
Effective system noise temperature: 260 K (NF = 2.8 dB)
Figure of merit: -12 dB/K           (with antenna gain of 12.2 dBic)
Transmitter characteristics
Power output: 17 dBW (50W) PEP; 11 dBW (12.5W) average
Intermodulation ratio (NPR method): -23 dBr
Downlink EIRP: 26.5dBW (446W) PEP; 20.5dBW (111W) avg (with 9.5 dBic)
Downlink 3 dB beamwidth: 67 degrees

Mode S: 36 kHz wide hard limiting transponder
Frequencies
Uplink: 435.601 - 435.637 MHz
Downlink: 2400.711 - 2400.747 MHz
Beacon: 2400.325 MHz
Receive system characteristics
Effective system noise temperature: (?) (Same as Mode B 70 cm rcvr)
Figure of merit: ??? dB/K     (With 9.5 dBic antenna gain)
Transmitter characteristics
Power output:   0.97 dBW (1.25) watts continuous
Downlink EIRP: 14 dBW (25 W) with 13 dBic antenna gain
Downlink 3 dB beamwidth: 45 degrees

RUDAK
Frequencies
Uplink: 1269.710 MHz
Downlink: 435.677 MHz
Digital rates
Uplink: 2400 bps bi-phase PSK (BPSK) with 7.5 kHz RF capture range
Downlink: 400 bps BPSK or 1200 bps NRZI
Protocol: AX.25 version 2

Port B/Task 3>

Date: 08 Oct 89
From: VK4CXX@VK4CXX
Subj: AsiaSat Oscar-13 Frequencies 2/2


                      Part 2: User Station Requirements

Mode B

Uplink requirements:
Frequency: 435.420 - 435.570 MHz
EIRP: 21.5 dBW for 20 dB peak and 10 dB average SNR on downlink
Polarization: RHC
Suitable uplink components: 10 watts to 12 dBic gain antenna

Downlink requirements:
Frequency: 145.975 - 145.825 MHz + GB @ 145.812 + EB @ 145.985 MHz
Polarization: RHC
Minimum recommended antenna gain: 10 dBic
Maximum receive system effective noise temperature: 625K (NF=5.0 dB)
Minimum figure of merit: -18 dB/K

Mode JL

Uplink requirements:
Frequency: Mode L: 1269.620 - 1269.330 MHz
           Mode J: 144.425 - 144.475 MHz
EIRP: Mode L: 25 dBW for 20 dB peak and 10 dB average SNR on downlink
      Mode J: 25 dBW for 20 dB peak and 10 dB average SNR on downlink
Polarization: RHC
Suitable uplink components: Mode L: 10 watts to 15 dBic gain antenna
                            Mode J: 20 watts to 12 dBic gain antenna
Downlink requirements
Frequency: 435.715 - 436.005 MHz + GB @ 435.651 MHz
Polarization: RHC
Minimum recommended antenna gain:  13 dBic
Maximum receive system effective noise temperature: 290K (NF=3.0 dB)
Minimum figure of merit: -12 dB/K

Mode S

Uplink requirements
Frequency: 435.601 - 435.637 MHz
EIRP: Approx 27 dBW under average Mode B AGC conditions
Polarization: RHC
Suitable uplink components:  25 watts to 13 dBic antenna

Downlink requirements
Frequency: 2400.711 - 2400.747 MHz  + Beacon @ 2400.325 MHz
Polarization: RHC
Minimum recommended antenna gain: 28 dBic
Typical antenna: 1.4 m dish assuming 50% efficiency
Maximum receive system effective noise temperature: 290K (NF=3.0 dB)
Minimum figure of merit: +3 dB/K

RUDAK

Uplink requirements
Frequency: 1269.710 MHz
EIRP: 26 dBW (400 W EIRP)
Typical suitable uplink: 8 watts to 17 dBic antenna
Polarization: RHC

Downlink requirements:
Frequency: 435.677 MHz
Typical receive antenna gain: 10 dBic for 12 dB Eb/No ratio.
Polarization: RHC

Please send changes etc to -
Lee Asher,
Asianet Satellite Librarian,
VK4CXX @ VK4CXX.