Panasonic KX-TC1205RUF, KX-TC1205RUW, KX-TC1205RUB, KX-TC1205RUS manual Handset to Base

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KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF

16.6.2. Handset to Base

Circuit Operation:

The voice signal from the handset user is picked up by the microphone (MC1), voice signal passes through "Compressor"

process to reduce noise as shown in BLOCK DIAGRAM (HANDSET) (P.37). And the voice is FM-modulated by VARICAP (DV1).

The carrier frequency is generated by TX VCO. The transmitter power transistor Q4 is turned on/off by CPU (VTX).

The carrier signal is amplified by RF AMP and sent to the handset duplexer and antenna.

The signal of 49MHz band (49.670~49.99MHz) which is input from ANT is filtered at DPX1 as shown in

BLOCK DIAGRAM (BASE UNIT) (P.36), then it is input to RF IC.

The signal input to RF IC is converted through Mixer inside of RF IC, RF filter (CF1, CF2) and Expander.

The signal is transmitted from the handset and received by the base unit antenna and amplified by RF amplifier Q1, then it is converted to10.7 MHz and 450 KHz Intermediate by RF IC. The demodulated audio signal is output from RF IC (DET OUT) and passed through "Expander" process to reduce noise, then voice signal is led to LINE AMP.

The signal is passed through TELEPHONE INTERFACE and Tel-line.

RX data (from Handset):

The data signal from handset (ex: Talk, ACK, COM) is also included in 49 MHz band same as the voice data. After second if filter, the data signal is made square shape by data limiting AMP of the RF IC. RX data is output to CPU (RX Data).

16.6.3. RF signal operation/control and PLL operation (RF UNIT)

Base unit radio frequency signal received by antenna passes through duplexer (DPX1). RF signal is amplified by RF AMP.

RF signal received from RF IC is mixed with RX local frequency at Mixer to generate 10.7 MHz wide band IF. The reference frequency is generated by X1 11.15 MHz crystal.

VC1 is the reference frequency for adjustment. The 10.7 MHz is mixed with reference and 450KHz narrow band IF is generated. The demodulation audio signal is adjusted to the maximum at T1.

RF IC is controlled by CPU (RF_STB, DATA, CLK). The RX local frequency is generated by RXVCO.

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Contents KX-TC1205RUB KX-TC1205RUW KX-TC1205RUS KX-TC1205RUF Contents Accessories and Packing Materials Recharge Battery information BatteryBattery Replacement Base Unit Handset Location of ControlsConnection KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF Adding Another Phone Making Calls Answering Calls OperationsKX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF KX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF Flash Button Show in Fig To remove Remove Disassembly InstructionsRear Cabinet Battery compartment cover Troubleshooting Guide Check Power Bell Reception Check Battery Charge CPU IC2 RF IC IC1 Check LinkRefer to Adjustment P.27 Check Handset Reception Check Handset TransmissionTest Mode Flow Chart Base Unit Adjustments Base UnitAdjustment How to change the channelIC3 Adjustment Standard Base UnitTest Mode Flow Chart Handset Adjustments HandsetIC1 How to change the channel AdjustmentComponent View Adjustment Standard HandsetFlow Solder Side View HOW to Check the Handset Speaker RF SpecificationBase Unit Frequency Table MHz STAND-BY TALK, Talk STAND-BY Explanation of CPU Data CommunicationRinging Changing the Channel Ports for transmitting and receiving of data IC1 Block Diagram Base UnitIC1 Block Diagram HandsetOutline Circuit OperationPower Supply Circuit Reset Circuit Base Unit Telephone Line Interface Charge CircuitBase to Handset Transmitter/ReceiverHandset to Base Signal Route Circuit Operation Handset Reset Circuit HandsetBattery Low / Power Down Detector 18.1. IC2 19.1. IC2 Preparation HOW to Replace Flat Package ICProcedure Modification Procedure of BridgeCabinet and Electrical Parts Location Base Unit Cabinet and Electrical Parts Location Handet Accessories and Packing Materials Cabinet and Electrical Parts Replacement Parts ListDiodesi ZNR1 ERJ3GEYJ514 PQXA36ASVC Battery ERJ3GEYJ202 Accessories and Packing Materials Base Unit Schematic Diagram Base Unit For Schematic DiagramHandset Schematic Diagram Handset 26.1 Base Unit Schematic Diagram Base UnitFILTER\2 26.2 RF Unit Base Unit27.1 Handset Schematic Diagram Handset450kHz RF Unit HandsetKX-TC1205RUB / KX-TC1205R UW / KX-TC1205R US / KX-TC1205RUF Circuit Board Base Unit IC1 IC4 IC2 IC3 Circuit Board Handset RX VCO TX VCO KXTC1205RUB
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