Panasonic KX-TCD420RUT / KX-A142RUT Service Manual ▷ View online
16 RF SPECIFICATION
16.1. Base Unit
Item
Value
Refer to -. *
Remarks
TX Power
More than 20 dBm ~ 25 dBm
Adjustment (Base Unit) (H)
Modulation
340 kHz/div ~ 402 kHz/div
Adjustment (Base Unit) (I)
Data type: Fig31
Frequency Offset
-50 kHz ~ +50 kHz
Adjustment (Base Unit) (J)
RX Sensitivity
< 1000 ppm
Adjustment (Base Unit) (K)
Timing Accuracy
< ± 5.0 ppm
Adjustment (Base Unit) (L)
RSSI Level
0x34 hex ± A hex
Adjustment (Base Unit) (M)
* : Refer to Adjustment (Base Unit) (P.43)
16.2. Handset
Item
Value
Refer to -. **
Remarks
TX Power
More than 20 dBm ~ 25 dBm
Adjustment (Base Unit) (I)
Modulation
340 kHz/div ~ 402 kHz/div
Adjustment (Base Unit) (J)
Data type: Fig31
Frequency Offset
-50 kHz ~ +50 kHz
Adjustment (Base Unit) (K)
RX Sensitivity
< 1000 ppm
Adjustment (Base Unit) (L)
Timing Accuracy
< ± 10 ppm
Adjustment (Base Unit) (M)
RSSI Level
0x34 hex ± A hex
Adjustment (Base Unit) (N)
** : Refer to Adjustment (P.49)
17 HOW TO CHECK THE HANDSET SPEAKER
1. Prepare the digital voltmeter, and set the selector knob to ohm meter.
2. Put the probes at the speaker terminals as shown below.
53
KX-TCD420RUT / KX-A142RUT
18 FREQUENCY TABLE (MHz)
BASE UNIT
HANDSET
Channel No
Transmit Frequency
Receive Frequency
Transmit Frequency
Receive Frequency
1
1897.344
1897.344
1897.344
1897.344
2
1895.616
1895.616
1895.616
1895.616
3
1893.888
1893.888
1893.888
1893.888
4
1892.160
1892.160
1892.160
1892.160
5
1890.432
1890.432
1890.432
1890.432
6
1888.704
1888.704
1888.704
1888.704
7
1886.976
1886.976
1886.976
1886.976
8
1885.248
1885.248
1885.248
1885.248
9
1883.520
1883.520
1883.520
1883.520
10
1881.792
1881.792
1881.792
1881.792
Note:
Channel No. 10: In the Test Mode on Base Unit and Handset.
54
KX-TCD420RUT / KX-A142RUT
19 BLOCK DIAGRAM (BASE UNIT)
KX-TCD420RUT BLOCK DIAGRAM (BASE UNIT)
Audio
Hook
Switch
Q2,Q3
Switch
Q2,Q3
Bridge
Rect D2
Rect D2
A/D
D/A
Analog
Front End
Front End
LED
CPU
BBIC
HOOK
RXAF
TXAF
DSP
BMC
Speech Encoding
Speech Decoding
RF
Interface
Interface
Burst Building
Burst Decoding
ADPCM
Codec Filter
Codec Filter
EEPROM
IC4
SDA
SCL
SYRI
RSSI
SYEN
RXDA
TXDA
J1
J2
IC8
IC9
4.0V
Reg.
Reg.
2.65V
Reg.
Reg.
4.0V
2.65V
VUNREG
27
26
133
123
123
63
12
20
20
139
5
22
25
18
25
18
5
6
4
RF Module
20
5
10
33
7
5
XTAL
10.368
X1
MHz
DTXAF
136
Bell/Caller ID
Interface
Interface
ANT1
ANT2
ANT2
to Tel_Line
A
B
A
B
to AC Adaptor
RING
81
Ring
Det
Det
76
(Clip Der.)
Flash
IC7
D0-D7
A0-A17
PROM
30
ADDRES
DATA
CTRL
29
SCK
1
11 14
13 12
103 104 106 105 107
SI
SO
CS
RD5/BUSY
Serial Flash ROM
IC6
71
Page
Limit
Register
Register
CHARGE
CONTACT
CONTACT
KX
-T
CD4
20RUT
/
K
X
-A142R
UT
55
20 CIRCUIT OPERATION (BASE UNIT)
20.1. Outline
Base Unit consists of the following ICs as shown in BLOCK DIAGRAM (BASE UNIT) (P.55).
·
DECT BBIC (Base Band IC): IC6
−
−
−
−
Handling all the audio, signal and data processing needed in a DECT base unit
−
−
−
−
Controlling the DECT specific physical layer and radio section (Burst Module Controller section)
−
−
−
−
ADPCM codec filter for speech encoding and speech decoding (DSP section)
−
−
−
−
Echo-cancellation and Echo-suppression (DSP section)
−
−
−
−
Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
−
−
−
−
DTMF receiver (DSP section)
−
−
−
−
Clock Generation for RF Module
−
−
−
−
ADC, DAC, timer, and power control circuitry
−
−
−
−
All interfaces (ex: RF module, EEPROM, LED, Analog Front End, etc.)
·
RF Module: IC9
−
−
−
−
PLL Oscillator
−
−
−
−
Detector
−
−
−
−
Compress/Expander
−
−
−
−
First/Second Mixer
−
−
−
−
Amplifier for transmission and reception
·
EEPROM: IC4
−
−
−
−
Temporary operating parameters (for RF, etc.)
·
Flash PROM: IC7
−
−
−
−
2M bit
−
−
−
−
Operational Firmware for CPU
·
Serial Flash ROM: IC6
−
−
−
−
4M bit
−
−
−
−
Audio data for TAM operation
·
Additionally,
−
−
−
−
Power Supply Circuit (+4.0V, +2.65V output)
−
−
−
−
Crystal Circuit (10.368MHz)
−
−
−
−
Charge Circuit
−
−
−
−
Telephone Line Interface Circuit
56
KX-TCD420RUT / KX-A142RUT
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