11.1 Communication unit: FB-2000
11-2
11.1.1 IF: 16P0275
IF board: 16P0275 consists of the transmitting circuit, receiving circuit, and the PLL circuit.
The transmitting circuit converts the transmission data from the MODEM board to 1.6
GHz.
The receiving circuit converts the 1.5 GHz receiving signal to 1.9 MHz, and then sends it
to the MODEM board.
Fig. 11.1.2 IF board block diagram
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