10.6 Service
10-30
Table 10.6.1 Measurement examples of Tx ATT, Rx ATT,
and Demodulator gain for APAC (EL 47 degrees)
Status
8D-FB 50 m
(-5.4 dB at 1.6 GHz)
8D-FB 30 m
(-9.0 dB at 1.6 GHz)
St-by 15.5 dB (indefinite) 19.5 dB (indefinite)
Tel (4 k AMBE) 15.5 dB 20.0 dB
Standard data 15.5 dB 20.0 dB
Tx ATT
Streaming data 256 k 15.5 dB 20.0 dB
St-by 6.0 dB 10 dB
Tel (4 k AMBE) 6.0 dB 10 dB
Standard data 6.0 dB 10 dB
Rx ATT
Streaming data 256 k 6.0 dB 10 dB
St-by 17.26 dB 17.81 dB
Tel (4 k AMBE) 6.81 dB 6.95 dB
Standard data 6.60 dB 6.85 dB
Demodulator gain
Streaming data 256 k 5.41 dB 7.09 dB
2. RX ATT
In order to improve the receiving dynamic range of the IF board, there is an RX ATT
circuit in the receiving input circuit of the IF board. It works in a manner similar to RF
AGC.
The TX ATT value determined by the calibration will be used for the calculation, and
will be set as the RX ATT value.
3. Demodulator gain
In order to have a constant receiving output level for the IF board, the “Demodulator”
circuit is adjusting the gain automatically. It works in a manner similar to IF AGC.
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