Antenna Switch Circuit - Panasonic KX-TG6500BXB Service Manual

21.6. Antenna Switch Circuit

This block selects the TX 5.8GHz signal or RX 5.8GHz signal, and connects to Antenna terminal.
<Handset>
IC881 includes Switch for High frequency signals, and controlled by PA_CONT signal and RX_EN signal from DSP. At the TX
mode 5.8GHz TX signal from 5.8GHz PA circuit leads to Antenna terminal, at the RX mode 5.8GHz RX signal from Antenna
terminal leads to 5.8GHz LNA circuit.
<Base Unit>
IC891 includes Switches for High frequency signals, and controlled by ANT0 signal and ANT1 signal from DSP.
DSP is checking RSSI (Received Signal Strength Indicator) signal, and selects better condition Antenna from two antennas.
At the TX mode 5.8GHz TX signal from 5.8GHz PA circuit leads to selected Antenna terminal, at the RX mode 5.8GHz RX
signal from selected Antenna terminal leads to 5.8GHz LNA circuit.
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KX-TG6500BXB / KX-TGA650BXB