Antenna Diversity; Charge Circuit - Panasonic KX-TG2583B Service Manual

2.4ghz cordless answering system

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13.18. Antenna Diversity

Antenna Diversity improve conversation quality. This means to reduce some noise during

conversation. RF unit send LQA (Link Quality Alarm) signal to IC751 when increase Error Bit's.

Then IC751 control RF switch IC761 to switch another Antenna.

Antenna selection control by IC501 is available only in test mode.

14. BLOCK DIAGRAM (Handset)

15. CIRCUIT OPERATION (Handset)

15.1. Power Supply Circuit

Voltage is supplied separately to each block.

Ni-cd battery is connected to CN202. When the handset is put on the cradle of the base unit, the

power is supplied from CHARGE1 and CHARGE2 terminals to charge the battery. Q207 detects

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