5.5 Power Amplifier (PA)
5-38
Receiving circuit
The signal received by the antenna is delivered to TX ANT connector via the antenna
coupler, and then PRESEL board from RX ANT connector via 50 ohm BK relay, K15.
When DSC general frequencies receiver board uses the TX/RX antenna, JP2 is set to
“open” and JP1 to “short”.
The received signal is amplified by Q3 and Q4, and applied to DIV OUT 1 and DIV
OUT 2 ports via T3 and T4. The OUT 1 and OUT 2 are connected to PRESEL and W/R
2 boards respectively. The signal at DIV OUT ports is 3 dB or more higher than RX
OUT port.
BAND-1:1.6-2.4M
BAND-3:3.6-5.4M
BAND-5:7.8-12.0M
BAND-7:18.0-30.0M
Fig.5.5.8 Frequency characteristics on TX FIL Board
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