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16.1
Introduction
The modulator includes capability to communicate with a Block Up Converter
(BUC) using an FSK signal multiplexed onto the IF output connector along with
the Tx IF signal, 10 MHz reference, and DC power to the BUC. The M&C
implements commands to control BUC functions and to query the BUC for
configuration or status information.
FSK Transmitter
Frequency
FSK Deviation
Deviation Tolerance
Output Level
Start Tone Time
Output Impedance
Start Tone
FSK Receiver
Locking Range
Input Sensitivity
Transmission Protocol
Baud Rate
Data Bits
Parity
Stop Bits
Message Rate
BUC Response Time
Maximum Response Time
Chapter 16. BUC FSK
COMMUNICATIONS
650 kHz ± 5 %
± 60 kHz nominal (+60 kHz mark)
± 50 kHz minimum, ± 70 kHz maximum
-5 to –15 dBm
10 ms minimum
50Ω
710 kHz
± 32.5 kHz
-15 dBm (50Ω)
9600 bps
8
None
1
1 every 40 msec
12 msec, typical
40 msec
16–1
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