Comtech EF Data CST-5005 - Manual (Page 82)

Theory of Operation CST-5005 C-Band Satellite Terminal
5–12 Rev. 1
5.4 Synthesizer
The RFT-505 uses a single synthesizer.
The purpose of the synthesizer module is to convert the 10 MHz reference signal to a
variable frequency to perform the conversion.
5.4.1 Specifications
RF Inputs: 10 MHz references
Connector Type SMA
Impedance 50
Ω
Input level +7 dBm
RF Outputs: 4662.5 to 5242.5 MHz
Connector Type SMA
Impedance 50
Ω
Level +4 dBm
5.4.2 Theory of Operation
The synthesizer module multiplies the 10 MHz reference clock to a variable clock by use
of:
•
VCOs
•
Loop filters
•
Phase detectors
•
Variable divide-down chain
The divide-down chain is controlled by the M&C board.
Refer to Figure 5-6 for a block diagram of the synthesizer.